Lead(II) iodide: Difference between revisions
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| OtherNames = Plumbous iodide |
| OtherNames = Plumbous iodide |
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|Section1={{Chembox Identifiers |
|Section1={{Chembox Identifiers |
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| CASNo = 10101-63-0 |
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| CASNo_Ref = {{cascite|correct|CAS}} |
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| PubChem = 24931 |
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| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} |
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} |
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| ChemSpiderID = 23305 |
| ChemSpiderID = 23305 |
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| EINECS = 233-256-9 |
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| UNII_Ref = {{fdacite|correct|FDA}} |
| UNII_Ref = {{fdacite|correct|FDA}} |
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| UNII = OTL90F2GLT |
| UNII = OTL90F2GLT |
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| UNNumber = 2291 3077 |
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| InChI = 1/2HI.Pb/h2*1H;/q;;+2/p-2 |
| InChI = 1/2HI.Pb/h2*1H;/q;;+2/p-2 |
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| InChIKey = RQQRAHKHDFPBMC-NUQVWONBAP |
| InChIKey = RQQRAHKHDFPBMC-NUQVWONBAP |
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| Line 20: | Line 25: | ||
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}} |
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}} |
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| StdInChIKey = RQQRAHKHDFPBMC-UHFFFAOYSA-L |
| StdInChIKey = RQQRAHKHDFPBMC-UHFFFAOYSA-L |
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| CASNo = 10101-63-0 |
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| CASNo_Ref = {{cascite|correct|CAS}} |
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| PubChem = 24931 |
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}} |
}} |
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|Section2={{Chembox Properties |
|Section2={{Chembox Properties |
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| Line 29: | Line 31: | ||
| Appearance = bright yellow powder |
| Appearance = bright yellow powder |
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| Odor = odorless |
| Odor = odorless |
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| Density = 6.16 g/cm<sup>3</sup> |
| Density = 6.16 g/cm<sup>3</sup>{{sfnp|Haynes|2016|p=4.69}} |
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| Solubility = {{ubl|0.44 g/L (0 °C) | 0.76 g/L (20 °C){{sfnp|Haynes|2016|p=4.69}}<ref>{{Cite journal |last1=Clever |first1=H. L. |last2=Johnston |first2=F. J. |date=1980 |title=The Solubility of Some Sparingly Soluble Lead Salts: An Evaluation of the Solubility in Water and Aqueous Electrolyte Solution |url=https://www.nist.gov/data/PDFfiles/jpcrd166.pdf |url-status=dead |journal=J. Phys. Chem. |series=Ref. Data (NIST data review) |volume=9 |issue=3 |pages=751–784 |bibcode=1980JPCRD...9..751C |doi=10.1063/1.555628 |archive-url=https://web.archive.org/web/20140211021914/https://www.nist.gov/data/PDFfiles/jpcrd166.pdf |archive-date=2014-02-11 |access-date=2017-07-13}}</ref> | 4.1 g/L (100 °C){{sfnp|Haynes|2016|p=5.171}}<ref name="patnaik" />}} |
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| Solubility = {{ubl|0.044 g/100 mL (0 °C) | 0.0756 g/100 mL (20 °C){{sfn|Clever|Johnston|1980}} | 0.41 g/100 mL (100 °C)<ref name="patnaik"/>}} |
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| SolubilityProduct = 4.41 |
| SolubilityProduct = 4.41{{e|−9}} (20 °C) |
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| SolubleOther = {{ubl|insoluble in [[ethanol]], cold [[hydrochloric acid|HCl]] | soluble in [[alkali]]s, [[potassium iodide|K<span style="font-family:serif;">I</span>]] solution, [[methyl isopropyl ketone]]<ref name="west"/>}} |
| SolubleOther = {{ubl|insoluble in [[ethanol]],{{sfnp|Haynes|2016|p=4.69}} cold [[hydrochloric acid|HCl]] | soluble in [[alkali]]s, [[potassium iodide|K<span style="font-family:serif;">I</span>]] solution, [[methyl isopropyl ketone]]<ref name="west" />}} |
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| MeltingPtC = |
| MeltingPtC = 410 |
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| MeltingPt_ref={{sfnp|Haynes|2016|p=4.69}} |
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| BoilingPtC = 953 |
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| |
| BoilingPtC = 872 |
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| BoilingPt_notes=decomp.{{sfnp|Haynes|2016|p=4.69}} |
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| MagSus = −126.5·10<sup>−6</sup> cm<sup>3</sup>/mol |
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| BandGap = 2.34 eV (direct)<ref>{{Cite journal |last1=Ahuja |first1=R. |last2=Arwin |first2=H. |last3=Ferreira Da Silva |first3=A. |last4=Persson |first4=C. |last5=Osorio-Guillén |first5=J. M. |last6=Souza De Almeida |first6=J. |last7=Moyses Araujo |first7=C. |last8=Veje |first8=E. |last9=Veissid |first9=N. |last10=An |first10=C. Y. |last11=Pepe |first11=I. |last12=Johansson |first12=B. |date=2002 |title=Electronic and optical properties of lead iodide |journal=Journal of Applied Physics |volume=92 |issue=12 |pages=7219–7224 |bibcode=2002JAP....92.7219A |doi=10.1063/1.1523145 |s2cid=29398039 |hdl-access=free |hdl=10495/11556}}</ref><ref>{{Cite journal |last1=Zhong |first1=Mianzeng |last2=Zhang |first2=Shuai |last3=Huang |first3=Le |last4=You |first4=Jingbi |last5=Wei |first5=Zhongming |last6=Liu |first6=Xinfeng |last7=Li |first7=Jingbo |date=2017 |title=Large-scale 2D PbI<sub>2</sub> monolayers: experimental realization and their indirect band-gap related properties |journal=Nanoscale |volume=9 |issue=11 |pages=3736–3741 |doi=10.1039/c6nr07924e |pmid=28102404}}</ref> |
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| MagSus = −126.5·10<sup>−6</sup> cm<sup>3</sup>/mol{{sfnp|Haynes|2016|p=4.128}} |
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}} |
}} |
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|Section3={{Chembox Structure |
|Section3={{Chembox Structure |
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| Structure_ref =<ref name=str>{{Cite journal |last1=Brixner |first1=L.H. |last2=Chen |first2=H.-Y. |last3=Foris |first3=C.M. |date=1981 |title=X-ray study of the PbCl<sub>2−x</sub>I<sub>x</sub> and PbBr<sub>2−x</sub>I<sub>x</sub> systems |journal=Journal of Solid State Chemistry |volume=40 |issue=3 |pages=336–343 |bibcode=1981JSSCh..40..336B |doi=10.1016/0022-4596(81)90400-X}}</ref> |
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| Coordination = octahedral |
| Coordination = octahedral |
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| CrystalStruct = [[ |
| CrystalStruct = [[Hexagonal]] [[Pearson symbol|hP6]] |
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| SpaceGroup = |
| SpaceGroup = P6<sub>3</sub>mc, No. 186 |
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| LattConst_a = 0.4556 nm |
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| Dipole = |
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| LattConst_b = 0.4556 nm |
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| LattConst_c = 1.3973 nm |
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| LattConst_alpha = |
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| LattConst_beta = |
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| LattConst_gamma = 120° |
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| LattConst_ref = |
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| LattConst_Comment = |
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| UnitCellVolume = |
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| UnitCellFormulas = 2 |
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}} |
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| Section4 = {{Chembox Thermochemistry |
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| Thermochemistry_ref ={{sfnp|Haynes|2016|p=5.24}} |
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| HeatCapacity = 77.4 J/(mol·K) |
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| Entropy = 174.9 J/(mol·K) |
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| DeltaHform = -175.5 kJ/mol |
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| DeltaGfree = -173.6 kJ/mol |
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| DeltaHcombust = |
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| DeltaHfus = |
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| DeltaHvap = |
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| DeltaHsublim = |
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}} |
}} |
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|Section7={{Chembox Hazards |
|Section7={{Chembox Hazards |
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| ExternalSDS = |
| ExternalSDS = |
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| GHSPictograms = {{GHS07}}{{GHS08}}{{GHS09}} |
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| EUClass = Repr. Cat. 1/3<br />Harmful ('''Xn''')<br />Dangerous for the environment ('''N''') |
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| GHSSignalWord = Danger |
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| RPhrases = {{R61}}, {{R20/22}}, {{R33}}, {{R62}}, {{R50/53}} |
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| HPhrases = {{H-phrases|302|332|360|373|410}} |
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| SPhrases = {{S53}}, {{S45}}, {{S60}}, {{S61}} |
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| PPhrases = {{P-phrases|201|202|260|261|264|270|271|273|281|301+312|304+312|304+340|308+313|312|314|330|391|405|501}} |
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| NFPA-H = 3 |
| NFPA-H = 3 |
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| NFPA-F = 0 |
| NFPA-F = 0 |
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}} |
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}} |
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'''Lead(II) iodide''' or '''lead iodide''' is a [[salt (chemistry)|salt]] with the formula {{chem|Pb|I|2}}. At [[room temperature]], it is a bright yellow odorless [[crystal]]line solid, that becomes orange and red when heated.<ref name="sigma"/> It was formerly called '''plumbous iodide.''' |
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'''Lead(II) iodide''' (or '''lead iodide''') is a chemical compound with the formula {{chem|Pb|I|2}}. At [[room temperature]], it is a bright yellow odorless [[crystal]]line solid, that becomes orange and red when heated.<ref name="sigma" /> It was formerly called '''plumbous iodide'''. |
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The compound currently has a few specialized applications, such as the manufacture of [[solar cells]]{{sfn|Dhiaputra|Permana|Maulana|Dwi Inayatie|2016}} and [[X-rays|X-ray]] and [[gamma rays|gamma-ray]] detectors.{{sfn|Shah|Olschner|Moy|Bennett|1996}} Its preparation is a popular demonstration in basic [[chemistry]] education, to teach topics such as [[precipitation reaction]]s and [[stoichiometry]].<ref name="anthony"/> It is [[photolysis|decomposed by light]] at moderately high temperatures<ref name="patnaik"/> and this effect has been used in a patented [[photography|photographic]] process.<ref name="patphot"/> |
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The compound currently has a few specialized applications, such as the manufacture of [[solar cells]],<ref name=Dhiaputra/> [[X-ray]]s and [[gamma rays|gamma-ray]] detectors.<ref name=Shah/> Its preparation is an entertaining and popular demonstration in [[chemistry]] education, to teach topics such as [[precipitation reaction]]s and [[stoichiometry]].<ref name="anthony" /> It is [[photolysis|decomposed by light]] at temperatures above {{convert|125|C|F}}, and this effect has been used in a patented [[photography|photographic]] process.<ref name="patnaik" /><ref name="patphot" /> |
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Lead iodide was formerly employed as a yellow pigment in some paints, with the name '''iodide yellow'''. However, that use has been largely discontinued due to its toxicity and poor stability.{{sfn|Eastaugh|Walsh|Chaplin|Siddall|2004}} |
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Lead iodide was formerly employed as a yellow pigment in some paints, with the name '''iodide yellow'''. However, that use has been largely discontinued due to its toxicity and poor stability.<ref name=Eastaugh/> |
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==Preparation== |
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== Preparation == |
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{{chem|Pb|I|2}} is commonly synthesized via a precipitation reaction between [[potassium iodide]] {{chem|K|I}} and [[lead(II) nitrate]] {{chem|Pb}}({{chem|N|O|3}})<sub>2</sub> in water solution: |
{{chem|Pb|I|2}} is commonly synthesized via a precipitation reaction between [[potassium iodide]] {{chem|K|I}} and [[lead(II) nitrate]] {{chem|Pb}}({{chem|N|O|3}})<sub>2</sub> in water solution: |
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:Pb( |
: {{chem2|Pb(NO3)2 + 2 KI → PbI2 + 2 KNO3}} |
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While the potassium nitrate {{chem|K|N|O|3}} is soluble, the lead iodide {{chem|Pb|I|2}} is nearly insoluble at [[room temperature]], and thus [[precipitate]]s out. |
While the potassium nitrate {{chem|K|N|O|3}} is soluble, the lead iodide {{chem|Pb|I|2}} is nearly insoluble at [[room temperature]], and thus [[precipitate]]s out.<ref name=Ahmad/> |
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Other soluble |
Other soluble compounds containing lead(II) and iodide can be used instead, for example [[lead(II) acetate]]<ref name=Dhiaputra/> and [[sodium iodide]]. |
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The compound can also be synthesized by reacting [[iodine]] vapor with molten [[lead]] between 500 and 700 °C.<ref name="matuz"/> |
The compound can also be synthesized by reacting [[iodine]] vapor with molten [[lead]] between 500 and 700 °C.<ref name="matuz" /> |
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A thin film of {{chem|Pb|I|2}} can also be prepared by depositing a film of [[lead(II) sulfide|lead sulfide]] {{chem|Pb|S}} and exposing it to iodine vapor, by the reaction |
A thin film of {{chem|Pb|I|2}} can also be prepared by depositing a film of [[lead(II) sulfide|lead sulfide]] {{chem|Pb|S}} and exposing it to iodine vapor, by the reaction |
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:PbS + |
: {{chem2|PbS + I2 → PbI2 + S}} |
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The [[sulfur]] is then washed with [[dimethyl sulfoxide]].<ref name="chaud"/> |
The [[sulfur]] is then washed with [[dimethyl sulfoxide]].<ref name="chaud" /> |
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==Crystallization== |
== Crystallization == |
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Lead iodide prepared from cold solutions |
Lead iodide prepared from cold solutions usually consists of many small hexagonal platelets, giving the yellow precipitate a silky appearance. Larger crystals can be obtained by exploiting the fact that [[solubility]] of lead iodide in water (like those of [[lead(II) chloride|lead chloride]] and [[lead(II) bromide|lead bromide]]) increases dramatically with temperature. The compound is colorless when dissolved in hot water, but crystallizes on cooling as thin but visibly larger bright yellow flakes, that settle slowly through the liquid — a visual effect often described as "golden rain".<ref name="gold" /> Larger crystals can be obtained by [[autoclave|autoclaving]] the {{chem|Pb|I|2}} with water under pressure at 200 °C.<ref name="zhu"/> |
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Even larger crystals can be obtained by slowing down the common reaction. |
Even larger crystals can be obtained by slowing down the common reaction. A simple setup is to submerge two [[Beaker (glassware)|beaker]]s containing the concentrated reactants in a larger container of water, taking care to avoid currents. As the two substances [[diffusion|diffuse]] through the water and meet, they slowly react and deposit the iodide in the space between the beakers.<ref name="tub" /> |
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Another similar method |
Another similar method is to react the two substances in a [[gel]] medium, that slows down the diffusion and supports the growing crystal away from the container's walls. Patel and Rao have used this method to grow crystals up to 30 mm in diameter and 2 mm thick.<ref name="patrao" /> |
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The reaction can be slowed also by separating the two reagents with a permeable membrane. This approach, with a [[cellulose]] membrane, was used in September 1988 to study the growth of {{chem|Pb|I|2}} crystals in zero gravity, in an experiment flown on the [[Space Shuttle Discovery]]. |
The reaction can be slowed also by separating the two reagents with a permeable membrane. This approach, with a [[cellulose]] membrane, was used in September 1988 to study the growth of {{chem|Pb|I|2}} crystals in zero gravity, in an experiment flown on the [[Space Shuttle Discovery]].<ref name=Scaife/> |
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{{chem|Pb|I|2}} can also be crystallized from powder by [[Sublimation (phase transition)|sublimation]] at 390 °C, in near [[vacuum]]<ref name="forn"/> or in a current of [[argon]] with some [[hydrogen]]. |
{{chem|Pb|I|2}} can also be crystallized from powder by [[Sublimation (phase transition)|sublimation]] at 390 °C, in near [[vacuum]]<ref name="forn" /> or in a current of [[argon]] with some [[hydrogen]].<ref name=Liu/> |
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Large high-purity crystals can be obtained by [[zone melting]] or by the [[Bridgman–Stockbarger technique]].<ref name="matuz"/><ref name="forn"/> These processes can remove various impurities from commercial {{chem|Pb|I|2}}. |
Large high-purity crystals can be obtained by [[zone melting]] or by the [[Bridgman–Stockbarger technique]].<ref name="matuz" /><ref name="forn" /> These processes can remove various impurities from commercial {{chem|Pb|I|2}}.<ref name=Tonn/> |
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==Applications== |
== Applications == |
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Lead iodide is a precursor material in the fabrication of highly efficient [[solar |
Lead iodide is a precursor material in the fabrication of highly efficient [[Perovskite solar cell]]. Typically, a solution of {{chem|Pb|I|2}} in an organic solvent, such as [[dimethylformamide]] or dimethylsulfoxide, is applied over a [[titanium dioxide]] layer by [[spin coating]]. The layer is then treated with a solution of [[methylammonium iodide]] {{chem|C|H|3|N|H|3|I}} and [[Annealing (metallurgy)|annealed]], turning it into the [[double salt]] [[methylammonium lead iodide]] {{chem|C|H|3|N|H|3|Pb|I|3}}, with a [[perovskite]] structure. The reaction changes the film's color from yellow to light brown.<ref name=Dhiaputra/> |
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{{chem|Pb|I|2}} is also used as a high-energy photon detector for gamma-rays and X-rays, due to its wide band gap which ensures low noise operation.<ref name="patnaik"/> |
{{chem|Pb|I|2}} is also used as a high-energy photon detector for gamma-rays and X-rays, due to its wide band gap which ensures low noise operation.<ref name="patnaik" /><ref name=Shah/><ref name="forn" /> |
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Lead iodide was formerly used as a paint pigment under the name "iodine yellow". |
Lead iodide was formerly used as a paint pigment under the name "iodine yellow". It was described by [[Prosper Mérimée]] (1830) as "not yet much known in commerce, is as bright as [[orpiment]] or [[lead(II) chromate|chromate of lead]]. It is thought to be more permanent; but time only can prove its pretension to so essential a quality. It is prepared by precipitating a solution of acetate or nitrate of lead, with potassium iodide: the nitrate produces a more brilliant yellow color."<ref name=Eastaugh/> However, due to the toxicity and instability of the compound it is no longer used as such.<ref name=Eastaugh/> It may still be used in art for [[bronzing]] and in gold-like [[mosaic]] tiles.<ref name="patnaik" /> |
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== Stability == |
== Stability == |
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Common [[Characterization (materials science)|material characterization]] techniques such as [[Electron microscope|electron microscopy]] can damage samples of lead |
Common [[Characterization (materials science)|material characterization]] techniques such as [[Electron microscope|electron microscopy]] can damage samples of lead(II) iodide.<ref>{{Cite journal |last=Forty |first=A. J. |date=August 1960 |title=Observations of the decomposition of crystals of lead iodide in the electron microscope |journal=Philosophical Magazine |volume=5 |issue=56 |pages=787–797 |bibcode=1960PMag....5..787F |doi=10.1080/14786436008241217}}</ref> [[Thin film]]s of lead(II) iodide are unstable in ambient air.<ref>{{Cite journal |last1=Popov |first1=Georgi |last2=Mattinen |first2=Miika |last3=Hatanpää |first3=Timo |last4=Vehkamäki |first4=Marko |last5=Kemell |first5=Marianna |last6=Mizohata |first6=Kenichiro |last7=Räisänen |first7=Jyrki |last8=Ritala |first8=Mikko |last9=Leskelä |first9=Markku |date=2019-02-12 |title=Atomic Layer Deposition of PbI<sub>2</sub> Thin Films |journal=Chemistry of Materials |volume=31 |issue=3 |pages=1101–1109 |doi=10.1021/acs.chemmater.8b04969 |doi-access=free}}</ref> Ambient air oxygen oxidizes iodide into elemental [[iodine]]: |
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: {{chem2|2 PbI2 + O2 → 2 PbO + 2 I2↑}} |
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== Toxicity == |
== Toxicity == |
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Lead iodide is very toxic to human health. |
Lead iodide is very toxic to human health. Ingestion will cause many acute and chronic consequences characteristic of [[lead poisoning]].<ref name=Flora/> Lead iodide has been found to be a carcinogen in animals suggesting the same may hold true in humans.<ref>{{Cite web |title=Haz-Map Category Details |url=https://hazmap.nlm.nih.gov/category-details?id=2524 |access-date=2016-04-29 |website=hazmap.nlm.nih.gov}}</ref> Lead iodide is an inhalation hazard, and appropriate respirators should be used when handling powders of lead iodide. |
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== Structure == |
== Structure == |
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The structure of {{chem|Pb|I|2}}, as determined by [[X-ray powder diffraction]], is primarily hexagonal close-packed system with alternating between layers of lead atoms and iodide atoms, with largely ionic bonding. |
The structure of {{chem|Pb|I|2}}, as determined by [[X-ray powder diffraction]], is primarily hexagonal close-packed system with alternating between layers of lead atoms and iodide atoms, with largely ionic bonding. Weak van der Waals interactions have been observed between lead–iodide layers.<ref name=Shah/> The most common stacking forms are 2H and 4H. The 4H polymorph is most common in samples grown from the melt, by precipitation, or by sublimation, whereas the 2H polymorph is usually formed by [[sol-gel]] synthesis.<ref name=str/> The solid can also take an R6 rhombohedral structure.<ref>{{Cite journal |last1=Sears |first1=W. M. |last2=Klein |first2=M. L. |last3=Morrison |first3=J. A. |date=1979 |title=Polytypism and the vibrational properties of I<sub>2</sub> |journal=Physical Review B |volume=19 |issue=4 |pages=2305–2313 |bibcode=1979PhRvB..19.2305S |doi=10.1103/PhysRevB.19.2305 |hdl-access=free |hdl=11375/12129}}</ref> |
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{{Gallery |mode=packed |align=center |height=300 |
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{| |
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|File:Lead (II) iodide precipitating out of solution.JPG|Lead(II) iodide precipitates when solutions of potassium iodide and lead(II) nitrate are combined |
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|File:Iodide lead(II).jpg|Experiment "golden rain" where iodide of lead(II) was recrystallized from hot solution by cooling, forming crystals of golden-yellow |
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}} |
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{{clear right}} |
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==See also== |
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== See also == |
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{{div col|colwidth=30em}} |
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{{columnslist|colwidth=28em| |
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* [[Lead(II) bromide]] |
* [[Lead(II) bromide]] |
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* [[Lead(II) chloride]] |
* [[Lead(II) chloride]] |
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* [[Tin(II) iodide]] |
* [[Tin(II) iodide]] |
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* [[Bridgman–Stockbarger technique]] |
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*[[Crystal structures of lead(II) iodide]] |
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}} |
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*[[Bridgman–Stockbarger technique]] |
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{{-}} |
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*[[Perovskite solar cell]] |
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{{div col end}} |
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==References== |
== References == |
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{{reflist|refs= |
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<references> |
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<ref name="Ahmad">{{Cite journal |last1=Ahmad |first1=S. |last2=Prakash |first2=G. V. |date=2012 |title=Fabrication of excitonic luminescent inorganic{{nbhyph}}organic hybrid nano and microcrystals |journal=International Conference on Fibre Optics and Photonics |publisher=[[The Optical Society|OSA]] |pages=MPo.40 |doi=10.1364/photonics.2012.mpo.40}}</ref> |
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<ref name="west">Philip W. West, Jack K. Carlton (1952): ''The extraction of lead iodide by methyl iso-propyl ketone". Analytica Chimica Acta, volume 6, pages 406-411. {{doi|10.1016/S0003-2670(00)86967-6}}</ref> |
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<ref name="Scaife">{{Cite journal |last1=Scaife |first1=C. W. J. |last2=Cavoli |first2=S. R. |last3=Blanton |first3=T. N. |last4=Morse |first4=M. D. |last5=Sever |first5=B. R. |last6=Willis |first6=W. S. |last7=Suib |first7=S. L. |date=1990 |title=Synthesis and characterization of lead(II) iodide grown in space |journal=Chemistry of Materials |volume=2 |issue=6 |pages=777–780 |doi=10.1021/cm00012a034}}</ref> |
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<ref name="sigma">{{Cite web|url=http://www.sigmaaldrich.com/catalog/product/aldrich/211168?lang=en%C2%AEion=us|title=Sigma-Aldrich catalog: Lead(II) iodide 99%|website=www.sigmaaldrich.com|access-date=2016-04-29}}</ref> |
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<ref name=" |
<ref name="Tonn">{{Cite journal |last1=Tonn |first1=J. |last2=Matuchova |first2=M. |last3=Danilewsky |first3=A. N. |last4=Cröll |first4=A. |date=2015 |title=Removal of oxidic impurities for the growth of high purity lead iodide single crystals |journal=Journal of Crystal Growth |volume=416 |pages=82–89 |bibcode=2015JCrGr.416...82T |doi=10.1016/j.jcrysgro.2015.01.024}}</ref> |
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<ref name="chaud">T.K. |
<ref name="chaud">{{Cite journal |last1=Chaudhuri |first1=T.K. |last2=Acharya |first2=H.N. |date=1982 |title=Preparation of lead iodide films by iodination of chemically deposited lead sulphide films |journal=Materials Research Bulletin |volume=17 |issue=3 |pages=279–286 |doi=10.1016/0025-5408(82)90074-5}}</ref> |
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<ref name="Dhiaputra">{{Cite conference |last1=Dhiaputra |first1=I. |last2=Permana |first2=B. |last3=Maulana |first3=Y. |last4=Dwi Inayatie |first4=Y. |last5=Purba |first5=Y. R. |last6=Bahtiar |first6=A. |date=2016 |title=Composition and crystal structure of perovskite films attained from electrodes of used car battery |conference=The 2nd Padjadjaran International Physics Symposium 2015 (PIPS-2015) |location=Jatinangor, Indonesia |volume=1712 |issue=50013 |doi=10.1063/1.4941896 |doi-access=free}}</ref> |
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<ref name="gold">{{cite magazine |last= Fleming |first= Declan |date= 6 January 2015 |title=Golden rain |url= https://eic.rsc.org/exhibition-chemistry/golden-rain/2000048.article |magazine= [[Education in Chemistry]] |volume= 52 |issue= 1 |page= 10 |issn=0013-1350 |publisher= [[Royal Society of Chemistry]] |access-date= 19 June 2018 }}</ref> |
|||
<ref name="Eastaugh">{{Cite book |last1=Eastaugh |first1=N. |title=The Pigment Compendium: a Dictionary of Historical Pigments |last2=Walsh |first2=V. |last3=Chaplin |first3=T. |last4=Siddall |first4=R. |date=2004 |publisher=Butterworth-Heinemann |isbn=978-0750657495}}</ref> |
|||
<ref name="anthony">Seth Anthony (2014): [http://hdl.handle.net/10217/82503 ''I. Cognitive and instructional factors relating to students' development of personal models of chemical systems in the general chemistry laboratory. [...]'']. Ph. D. Thesis, Colorado State University</ref> |
|||
<ref name="Flora">{{Cite journal |last1=Flora |first1=G. |last2=Gupta |first2=D. |last3=Tiwari |first3=A. |date=2012 |title=Toxicity of lead: a review with recent updates |journal=Interdisciplinary Toxicology |volume=5 |issue=2 |pages=47–58 |doi=10.2478/v10102-012-0009-2 |pmc=3485653 |pmid=23118587}}</ref> |
|||
<ref name="patnaik">P. Patnaik (2002): ''Handbook of Inorganic Chemicals''. McGraw-Hill. {{ISBN|978-0070494398}}</ref> |
|||
<ref name="Liu">{{Cite journal |last1=Liu |first1=X. |last2=Ha |first2=S. T. |last3=Zhang |first3=Qing |last4=de la Mata |first4=M. |last5=Magen |first5=C. |last6=Arbiol |first6=J. |last7=Sum |first7=T. C. |last8=Xiong |first8=Q. |date=2015 |title=Whispering Gallery Mode Lasing from Hexagonal Shaped Layered Lead Iodide Crystals |journal=ACS Nano |volume=9 |issue=1 |pages=687–695 |doi=10.1021/nn5061207 |pmid=25562110 |hdl-access=free |hdl=10220/38493}}</ref> |
|||
<ref name="zhu">Xinghua Zhu, Peihua Wangyang, Hui Sun, Dingyu Yang, Xiuying Gao, Haibo Tian (2016) ''Facile growth and characterization of freestanding single crystal PbI2 film''. Materials Letters, volume 180, pages 59–62. {{doi|10.1016/j.matlet.2016.05.101}}</ref> |
|||
<ref name="west">{{Cite journal |last1=West |first1=Philip W. |last2=Carlton |first2=Jack K. |date=1952 |title=The extraction of lead iodide by methyl iso-propyl ketone |journal=Analytica Chimica Acta |volume=6 |pages=406–411 |doi=10.1016/S0003-2670(00)86967-6}}</ref> |
|||
<ref name="patphot">J Jacobs and R Corrigan (1970): ''Lead iodide film''. US Patent US3764368-A. Filed Feb 22, 1972; published Oct 9, 1973,</ref> |
|||
<ref name="sigma">{{Cite web |title=Sigma-Aldrich catalog: Lead(II) iodide 99% |url=http://www.sigmaaldrich.com/catalog/product/aldrich/211168?lang=en%C2%AEion=us |access-date=2016-04-29 |website=www.sigmaaldrich.com}}</ref> |
|||
<ref name="tub">W. Conard Fernelius and Kenneth D. Detling (1934): ''Preparation of crystals of sparingly soluble salts''. J. Chem. Educ., volume 11, issue 3, page 176. {{doi|10.1021/ed011p176}}.</ref> |
|||
<ref name="matuz">{{Cite journal |last1=Matuchova |first1=M. |last2=Zdansky |first2=K. |last3=Zavadil |first3=J. |last4=Danilewsky |first4=A. |last5=Riesz |first5=F. |last6=Hassan |first6=M.A.S. |last7=Alexiew |first7=D. |last8=Kral |first8=R. |date=2009 |title=Study of the influence of the rare-earth elements on the properties of lead iodide |journal=Journal of Crystal Growth |volume=311 |issue=14 |pages=3557–3562 |bibcode=2009JCrGr.311.3557M |doi=10.1016/j.jcrysgro.2009.04.043}}</ref> |
|||
<ref name="hats">E. Hatschek (1906) Zeit. anorg. Chem., volume 48, page 364.</ref> |
|||
<ref name="gold">{{Cite journal |last=Fleming |first=Declan |date=6 January 2015 |title=Golden rain |url=https://eic.rsc.org/exhibition-chemistry/golden-rain/2000048.article |journal=[[Education in Chemistry]] |volume=52 |issue=1 |page=10}}</ref> |
|||
<ref name="patrao">A. R. Patel and A. Venkateswara Rao (1980): ''An improved design to grow larger and more perfect single crystals in gels'' Journal of Crystal Growth, volume 49, issue 3, pages 589-590. {{doi|10.1016/0022-0248(80)90134-7}}</ref> |
|||
<ref name="anthony">{{Cite thesis |last=Anthony |first=Seth |title=I. Cognitive and instructional factors relating to students' development of personal models of chemical systems in the general chemistry laboratory. [...] |date=2014 |publisher=Colorado State University |hdl=10217/82503 |url=http://hdl.handle.net/10217/82503}}</ref> |
|||
<ref name="forn">L. Fornaro, E. Saucedo, L. Mussio, L. Yerman, X. Ma, A. Burger (2001): ''Lead iodide film deposition and characterization'' Proc. 11th Int. Workshop on Room Temperature Semiconductor X- and Gamma-Ray Detectors and Associated Electronics; in Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, volume 458, issues 1–2, pages 406–412. {{doi|10.1016/S0168-9002(00)00933-5}}</ref> |
|||
<ref name="patnaik">{{Cite encyclopedia |title=Handbook of Inorganic Chemicals |publisher=McGraw-Hill |last=Patnaik |first=P. |date=2002 |isbn=978-0070494398}}</ref> |
|||
</references> |
|||
<ref name="zhu">{{Cite journal |last1=Zhu |first1=Xinghua |last2=Wangyang |first2=Peihua |last3=Sun |first3=Hui |last4=Yang |first4=Dingyu |last5=Gao |first5=Xiuying |last6=Tian |first6=Haibo |date=2016 |title=Facile growth and characterization of freestanding single crystal PbI<sub>2</sub> film |journal=Materials Letters |volume=180 |pages=59–62 |doi=10.1016/j.matlet.2016.05.101}}</ref> |
|||
<!--{{Reflist|30em}}--> |
|||
<ref name="patphot">{{Cite patent |inventor1-last=Jacobs |inventor1-first=J. |inventor2-last=Corrigan |inventor2-first=R. |pridate=1970 |title=Lead iodide film |country=US |number=3764368 |fdate=22 February 1972 |pubdate=9 October 1973}}</ref> |
|||
==Sources== |
|||
<ref name="tub">{{Cite journal |last1=Fernelius |first1=W. Conard |last2=Detling |first2=Kenneth D. |date=1934 |title=Preparation of crystals of sparingly soluble salts |journal=Journal of Chemical Education |volume=11 |issue=3 |page=176 |bibcode=1934JChEd..11..176F |doi=10.1021/ed011p176}}.</ref> |
|||
{{refbegin|30em}} |
|||
<ref name="patrao">{{Cite journal |last1=Patel |first1=A.R. |last2=Rao |first2=A. Venkateswara |date=1980 |title=An improved design to grow larger and more perfect single crystals in gels |journal=Journal of Crystal Growth |volume=49 |issue=3 |pages=589–590 |bibcode=1980JCrGr..49..589P |doi=10.1016/0022-0248(80)90134-7}}</ref> |
|||
* {{Cite journal |
|||
| last1 = Ahmad |
|||
<ref name="forn">{{Cite journal |last1=Fornaro |first1=L. |last2=Saucedo |first2=E. |last3=Mussio |first3=L. |last4=Yerman |first4=L. |last5=Ma |first5=X. |last6=Burger |first6=A. |date=2001 |title=Lead iodide film deposition and characterization |journal=Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment |volume=458 |issue=1–2 |pages=406–412 |bibcode=2001NIMPA.458..406F |doi=10.1016/S0168-9002(00)00933-5}}</ref> |
|||
| first1 = S. |
|||
| last2 = Prakash |
|||
<ref name="Shah">{{Cite journal |last1=Shah |first1=K. S. |last2=Olschner |first2=F. |last3=Moy |first3=L. P. |last4=Bennett |first4=P. |last5=Misra |first5=M. |last6=Zhang |first6=J. |last7=Squillante |first7=M. R. |last8=Lund |first8=J. C. |date=1996 |title=Lead iodide x-ray detection systems |journal=Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment |series=Proceedings of the 9th International Workshop on Room Temperature Semiconductor X- and γ-Ray Detectors, Associated Electronics and Applications |volume=380 |issue=1–2 |pages=266–270 |bibcode=1996NIMPA.380..266S |doi=10.1016/S0168-9002(96)00346-4}}</ref> |
|||
| first2 = G. V. |
|||
| date = 2012 |
|||
| title = Fabrication of excitonic luminescent inorganic{{nbhyph}}organic hybrid nano and microcrystals |
|||
| journal = International Conference on Fibre Optics and Photonics |
|||
| pages = MPo.40 |
|||
| publisher = [[The Optical Society|OSA]] |
|||
| doi = 10.1364/photonics.2012.mpo.40 |
|||
| ref = harv |
|||
}} |
|||
* {{cite journal |
|||
| last1 = Bhavsar |
|||
| first1 = D. S. |
|||
| date = 2011 |
|||
| title = Structural studies of vacuum evaporated Lead Iodide Thin Films |
|||
| url = http://pelagiaresearchlibrary.com/advances-in-applied-science/vol2-iss2/adasr-2011-2-2-407-413.pdf |
|||
| journal = Applied Science |
|||
| series = Advances in Applied Science Research |
|||
| volume = 2 |
|||
| issue = 2 |
|||
| pages = 407–413 |
|||
| ref = harv |
|||
}} |
|||
* {{cite journal |
|||
| title = The Solubility of Some Sparingly Soluble Lead Salts: An Evaluation of the Solubility in Water and Aqueous Electrolyte Solution |
|||
| first1 = H. L. |
|||
| last1 = Clever |
|||
| first2 = F. J. |
|||
| last2 = Johnston |
|||
| date = 1980 |
|||
| journal = J. Phys. Chem. |
|||
| series = Ref. Data (NIST data review) |
|||
| volume = 9 |
|||
| issue = 3 |
|||
| pages = 751–784 |
|||
| url = https://www.nist.gov/data/PDFfiles/jpcrd166.pdf |
|||
| ref = harv |
|||
| doi=10.1063/1.555628 |
|||
}} |
|||
* {{cite conference |
|||
| title = Composition and crystal structure of perovskite films attained from electrodes of used car battery |
|||
| first1 = I. |
|||
| last1 = Dhiaputra |
|||
| first2 = B. |
|||
| last2 = Permana |
|||
| first3 = Y. |
|||
| last3 = Maulana |
|||
| first4 = Y. |
|||
| last4 = Dwi Inayatie |
|||
| first5 = Y. R. |
|||
| last5 = Purba |
|||
| first6 = A. |
|||
| last6 = Bahtiar |
|||
| conference = The 2nd Padjadjaran International Physics Symposium 2015 (PIPS-2015) |
|||
| volume = 1712 |
|||
| issue = 50013 |
|||
| date = 2016 |
|||
| doi = 10.1063/1.4941896 |
|||
| location = Jatinangor, Indonesia |
|||
| ref = harv |
|||
}} |
|||
* {{cite book |
|||
| title = The Pigment Compendium: a Dictionary of Historical Pigments |
|||
| last1 = Eastaugh |
|||
| first1 = N. |
|||
| first2 = V. |
|||
| last2 = Walsh |
|||
| first3 = T. |
|||
| last3 = Chaplin |
|||
| first4 = R. |
|||
| last4 = Siddall |
|||
| publisher = Butterworth-Heinemann |
|||
| date = 2004 |
|||
| isbn = 978-0750657495 |
|||
|ref=harv |
|||
}} |
|||
* {{cite journal |
|||
| last1 = Flora |
|||
| first1 = G. |
|||
| last2 = Gupta |
|||
| first2 = D. |
|||
| last3 = Tiwari |
|||
| first3 = A. |
|||
| title = Toxicity of lead: a review with recent updates |
|||
| url = http://www.degruyter.com/view/j/intox.2012.5.issue-2/v10102-012-0009-2/v10102-012-0009-2.xml |
|||
| journal = Interdisciplinary Toxicology |
|||
| volume = 5 |
|||
| issue = 2 |
|||
| pages = 47–58 |
|||
| doi = 10.2478/v10102-012-0009-2 |
|||
| pmc = 3485653 |
|||
| pmid = 23118587 |
|||
| ref = harv |
|||
| year = 2012 |
|||
}} |
|||
* {{cite journal |
|||
| last1 = Hassan |
|||
| first1 = M. A. |
|||
| last2 = Jafar |
|||
| first2 = M. M. |
|||
| last3 = Matuchova |
|||
| first3 = M. |
|||
| last4 = Bulos |
|||
| first4 = B. N. |
|||
| title = An Experimental Evidence of some Lead Iodide Polytypes Compatible with the Dielectric Functions Model |
|||
| journal = Journal of Applied Sciences |
|||
| date = 2010 |
|||
| volume = 10 |
|||
| issue = 24 |
|||
| pages = 3367–3373 |
|||
| doi = 10.3923/jas.2010.3367.3373 |
|||
| ref = harv |
|||
}} |
|||
* {{cite journal |
|||
| last1 = Liu |
|||
| first1 = X. |
|||
| last2 = Ha |
|||
| first2 = S. T. |
|||
| last3 = Zhang |
|||
| first3 = Qing |
|||
| last4 = de la Mata |
|||
| first4 = M. |
|||
| last5 = Magen |
|||
| first5 = C. |
|||
| last6 = Arbiol |
|||
| first6 = J. |
|||
| last7 = Sum |
|||
| first7 = T. C. |
|||
| last8 = Xiong |
|||
| first8 = Q. |
|||
| date = 2015 |
|||
| title = Whispering Gallery Mode Lasing from Hexagonal Shaped Layered Lead Iodide Crystals |
|||
| journal = ACS Nano |
|||
| volume = 9 |
|||
| issue = 1 |
|||
| pages = 687–695 |
|||
| doi = 10.1021/nn5061207 |
|||
| pmid = 25562110 |
|||
| ref = harv |
|||
}} |
}} |
||
== Cited sources == |
|||
* {{cite journal |
|||
* {{Cite book |title=[[CRC Handbook of Chemistry and Physics]] |date=2016 |publisher=[[CRC Press]] |isbn=9781498754293 |editor-last=Haynes |editor-first=William M. |edition=97th}} |
|||
| last1 = Scaife |
|||
| first1 = C. W. J. |
|||
| last2 = Cavoli |
|||
| first2 = S. R. |
|||
| last3 = Blanton |
|||
| first3 = T. N. |
|||
| last4 = Morse |
|||
| first4 = M. D. |
|||
| last5 = Sever |
|||
| first5 = B. R. |
|||
| last6 = Willis |
|||
| first6 = W. S. |
|||
| last7 = Suib |
|||
| first7 = S. L. |
|||
| date = 1990 |
|||
| title = Synthesis and characterization of lead(II) iodide grown in space |
|||
| journal = Chemistry of Materials |
|||
| volume = 2 |
|||
| issue = 6 |
|||
| pages = 777–780 |
|||
| doi = 10.1021/cm00012a034 |
|||
| ref = harv |
|||
}} |
|||
* {{cite journal |
|||
| last1 = Shah |
|||
| first1 = K. S. |
|||
| last2 = Olschner |
|||
| first2 = F. |
|||
| last3 = Moy |
|||
| first3 = L. P. |
|||
| last4 = Bennett |
|||
| first4 = P. |
|||
| last5 = Misra |
|||
| first5 = M. |
|||
| last6 = Zhang |
|||
| first6 = J. |
|||
| last7 = Squillante |
|||
| first7 = M. R. |
|||
| last8 = Lund |
|||
| first8 = J. C. |
|||
| date = 1996 |
|||
| title = Lead iodide X-ray detection systems |
|||
| journal = Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment |
|||
| series = Proceedings of the 9th International Workshop on Room Temperature Semiconductor X- and γ-Ray Detectors, Associated Electronics and Applications |
|||
| volume = 380 |
|||
| issue = 1–2 |
|||
| pages = 266–270 |
|||
| doi = 10.1016/S0168-9002(96)00346-4 |
|||
| ref = harv |
|||
}} |
|||
* {{cite journal |
|||
| last1 = Tonn |
|||
| first1 = J. |
|||
| last2 = Matuchova |
|||
| first2 = M. |
|||
| last3 = Danilewsky |
|||
| first3 = A. N. |
|||
| last4 = Cröll |
|||
| first4 = A. |
|||
| date = 2015 |
|||
| title = Removal of oxidic impurities for the growth of high purity lead iodide single crystals |
|||
| journal = Journal of Crystal Growth |
|||
| volume = 416 |
|||
| pages = 82–89 |
|||
| doi = 10.1016/j.jcrysgro.2015.01.024 |
|||
| ref = harv |
|||
}} |
|||
{{refend}} |
|||
==External links== |
== External links == |
||
{{Commons category|Lead(II) iodide}} |
{{Commons category|Lead(II) iodide}} |
||
* [ |
* [https://wwwn.cdc.gov/TSP/ToxFAQs/ToxFAQsLanding.aspx?id=93&tid=22 Toxic Substances Portal – Lead] |
||
{{Lead compounds}} |
{{Lead compounds}} |
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{{Iodides}} |
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[[Category:Iodides]] |
[[Category:Iodides]] |
||
Latest revision as of 14:32, 21 July 2024
| |
| |
| Names | |
|---|---|
| Other names
Plumbous iodide
| |
| Identifiers | |
3D model (JSmol)
|
|
| ChemSpider | |
| ECHA InfoCard | 100.030.220 |
| EC Number |
|
PubChem CID
|
|
| UNII | |
| UN number | 2291 3077 |
CompTox Dashboard (EPA)
|
|
| |
| |
| Properties | |
| PbI 2 | |
| Molar mass | 461.01 g/mol |
| Appearance | bright yellow powder |
| Odor | odorless |
| Density | 6.16 g/cm3[1] |
| Melting point | 410 °C (770 °F; 683 K)[1] |
| Boiling point | 872 °C (1,602 °F; 1,145 K) decomp.[1] |
Solubility product (Ksp)
|
4.41×10−9 (20 °C) |
| Solubility | |
| Band gap | 2.34 eV (direct)[6][7] |
| −126.5·10−6 cm3/mol[8] | |
| Structure[9] | |
| Hexagonal hP6 | |
| P63mc, No. 186 | |
a = 0.4556 nm, b = 0.4556 nm, c = 1.3973 nm α = 90°, β = 90°, γ = 120°°
| |
Formula units (Z)
|
2 |
| octahedral | |
| Thermochemistry[10] | |
Heat capacity (C)
|
77.4 J/(mol·K) |
Std molar
entropy (S⦵298) |
174.9 J/(mol·K) |
Std enthalpy of
formation (ΔfH⦵298) |
-175.5 kJ/mol |
Gibbs free energy (ΔfG⦵)
|
-173.6 kJ/mol |
| Hazards | |
| GHS labelling: | |
  
| |
| Danger | |
| H302, H332, H360, H373, H410 | |
| P201, P202, P260, P261, P264, P270, P271, P273, P281, P301+P312, P304+P312, P304+P340, P308+P313, P312, P314, P330, P391, P405, P501 | |
| NFPA 704 (fire diamond) | |
| Flash point | Non-flammable |
| Related compounds | |
Other anions
|
|
Other cations
|
Tin(II) iodide |
Related compounds
|
|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
| |
Lead(II) iodide (or lead iodide) is a chemical compound with the formula PbI
2. At room temperature, it is a bright yellow odorless crystalline solid, that becomes orange and red when heated.[11] It was formerly called plumbous iodide.
The compound currently has a few specialized applications, such as the manufacture of solar cells,[12] X-rays and gamma-ray detectors.[13] Its preparation is an entertaining and popular demonstration in chemistry education, to teach topics such as precipitation reactions and stoichiometry.[14] It is decomposed by light at temperatures above 125 °C (257 °F), and this effect has been used in a patented photographic process.[4][15]
Lead iodide was formerly employed as a yellow pigment in some paints, with the name iodide yellow. However, that use has been largely discontinued due to its toxicity and poor stability.[16]
Preparation
[edit]PbI
2 is commonly synthesized via a precipitation reaction between potassium iodide KI and lead(II) nitrate Pb(NO
3)2 in water solution:
- Pb(NO3)2 + 2 KI → PbI2 + 2 KNO3
While the potassium nitrate KNO
3 is soluble, the lead iodide PbI
2 is nearly insoluble at room temperature, and thus precipitates out.[17]
Other soluble compounds containing lead(II) and iodide can be used instead, for example lead(II) acetate[12] and sodium iodide.
The compound can also be synthesized by reacting iodine vapor with molten lead between 500 and 700 °C.[18]
A thin film of PbI
2 can also be prepared by depositing a film of lead sulfide PbS and exposing it to iodine vapor, by the reaction
- PbS + I2 → PbI2 + S
The sulfur is then washed with dimethyl sulfoxide.[19]
Crystallization
[edit]Lead iodide prepared from cold solutions usually consists of many small hexagonal platelets, giving the yellow precipitate a silky appearance. Larger crystals can be obtained by exploiting the fact that solubility of lead iodide in water (like those of lead chloride and lead bromide) increases dramatically with temperature. The compound is colorless when dissolved in hot water, but crystallizes on cooling as thin but visibly larger bright yellow flakes, that settle slowly through the liquid — a visual effect often described as "golden rain".[20] Larger crystals can be obtained by autoclaving the PbI
2 with water under pressure at 200 °C.[21]
Even larger crystals can be obtained by slowing down the common reaction. A simple setup is to submerge two beakers containing the concentrated reactants in a larger container of water, taking care to avoid currents. As the two substances diffuse through the water and meet, they slowly react and deposit the iodide in the space between the beakers.[22]
Another similar method is to react the two substances in a gel medium, that slows down the diffusion and supports the growing crystal away from the container's walls. Patel and Rao have used this method to grow crystals up to 30 mm in diameter and 2 mm thick.[23]
The reaction can be slowed also by separating the two reagents with a permeable membrane. This approach, with a cellulose membrane, was used in September 1988 to study the growth of PbI
2 crystals in zero gravity, in an experiment flown on the Space Shuttle Discovery.[24]
PbI
2 can also be crystallized from powder by sublimation at 390 °C, in near vacuum[25] or in a current of argon with some hydrogen.[26]
Large high-purity crystals can be obtained by zone melting or by the Bridgman–Stockbarger technique.[18][25] These processes can remove various impurities from commercial PbI
2.[27]
Applications
[edit]Lead iodide is a precursor material in the fabrication of highly efficient Perovskite solar cell. Typically, a solution of PbI
2 in an organic solvent, such as dimethylformamide or dimethylsulfoxide, is applied over a titanium dioxide layer by spin coating. The layer is then treated with a solution of methylammonium iodide CH
3NH
3I and annealed, turning it into the double salt methylammonium lead iodide CH
3NH
3PbI
3, with a perovskite structure. The reaction changes the film's color from yellow to light brown.[12]
PbI
2 is also used as a high-energy photon detector for gamma-rays and X-rays, due to its wide band gap which ensures low noise operation.[4][13][25]
Lead iodide was formerly used as a paint pigment under the name "iodine yellow". It was described by Prosper Mérimée (1830) as "not yet much known in commerce, is as bright as orpiment or chromate of lead. It is thought to be more permanent; but time only can prove its pretension to so essential a quality. It is prepared by precipitating a solution of acetate or nitrate of lead, with potassium iodide: the nitrate produces a more brilliant yellow color."[16] However, due to the toxicity and instability of the compound it is no longer used as such.[16] It may still be used in art for bronzing and in gold-like mosaic tiles.[4]
Stability
[edit]Common material characterization techniques such as electron microscopy can damage samples of lead(II) iodide.[28] Thin films of lead(II) iodide are unstable in ambient air.[29] Ambient air oxygen oxidizes iodide into elemental iodine:
- 2 PbI2 + O2 → 2 PbO + 2 I2↑
Toxicity
[edit]Lead iodide is very toxic to human health. Ingestion will cause many acute and chronic consequences characteristic of lead poisoning.[30] Lead iodide has been found to be a carcinogen in animals suggesting the same may hold true in humans.[31] Lead iodide is an inhalation hazard, and appropriate respirators should be used when handling powders of lead iodide.
Structure
[edit]The structure of PbI
2, as determined by X-ray powder diffraction, is primarily hexagonal close-packed system with alternating between layers of lead atoms and iodide atoms, with largely ionic bonding. Weak van der Waals interactions have been observed between lead–iodide layers.[13] The most common stacking forms are 2H and 4H. The 4H polymorph is most common in samples grown from the melt, by precipitation, or by sublimation, whereas the 2H polymorph is usually formed by sol-gel synthesis.[9] The solid can also take an R6 rhombohedral structure.[32]
-
Lead(II) iodide precipitates when solutions of potassium iodide and lead(II) nitrate are combined -
Experiment "golden rain" where iodide of lead(II) was recrystallized from hot solution by cooling, forming crystals of golden-yellow
_iodide_precipitating_out_of_solution.JPG)
.jpg)
See also
[edit]References
[edit]- ^ a b c d e Haynes (2016), p. 4.69.
- ^ Clever, H. L.; Johnston, F. J. (1980). "The Solubility of Some Sparingly Soluble Lead Salts: An Evaluation of the Solubility in Water and Aqueous Electrolyte Solution" (PDF). J. Phys. Chem. Ref. Data (NIST data review). 9 (3): 751–784. Bibcode:1980JPCRD...9..751C. doi:10.1063/1.555628. Archived from the original (PDF) on 2014-02-11. Retrieved 2017-07-13.
- ^ Haynes (2016), p. 5.171.
- ^ a b c d Patnaik, P. (2002). Handbook of Inorganic Chemicals. McGraw-Hill. ISBN 978-0070494398.
- ^ West, Philip W.; Carlton, Jack K. (1952). "The extraction of lead iodide by methyl iso-propyl ketone". Analytica Chimica Acta. 6: 406–411. doi:10.1016/S0003-2670(00)86967-6.
- ^ Ahuja, R.; Arwin, H.; Ferreira Da Silva, A.; Persson, C.; Osorio-Guillén, J. M.; Souza De Almeida, J.; Moyses Araujo, C.; Veje, E.; Veissid, N.; An, C. Y.; Pepe, I.; Johansson, B. (2002). "Electronic and optical properties of lead iodide". Journal of Applied Physics. 92 (12): 7219–7224. Bibcode:2002JAP....92.7219A. doi:10.1063/1.1523145. hdl:10495/11556. S2CID 29398039.
- ^ Zhong, Mianzeng; Zhang, Shuai; Huang, Le; You, Jingbi; Wei, Zhongming; Liu, Xinfeng; Li, Jingbo (2017). "Large-scale 2D PbI2 monolayers: experimental realization and their indirect band-gap related properties". Nanoscale. 9 (11): 3736–3741. doi:10.1039/c6nr07924e. PMID 28102404.
- ^ Haynes (2016), p. 4.128.
- ^ a b Brixner, L.H.; Chen, H.-Y.; Foris, C.M. (1981). "X-ray study of the PbCl2−xIx and PbBr2−xIx systems". Journal of Solid State Chemistry. 40 (3): 336–343. Bibcode:1981JSSCh..40..336B. doi:10.1016/0022-4596(81)90400-X.
- ^ Haynes (2016), p. 5.24.
- ^ "Sigma-Aldrich catalog: Lead(II) iodide 99%". www.sigmaaldrich.com. Retrieved 2016-04-29.
- ^ a b c Dhiaputra, I.; Permana, B.; Maulana, Y.; Dwi Inayatie, Y.; Purba, Y. R.; Bahtiar, A. (2016). Composition and crystal structure of perovskite films attained from electrodes of used car battery. The 2nd Padjadjaran International Physics Symposium 2015 (PIPS-2015). Vol. 1712. Jatinangor, Indonesia. doi:10.1063/1.4941896.
- ^ a b c Shah, K. S.; Olschner, F.; Moy, L. P.; Bennett, P.; Misra, M.; Zhang, J.; Squillante, M. R.; Lund, J. C. (1996). "Lead iodide x-ray detection systems". Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. Proceedings of the 9th International Workshop on Room Temperature Semiconductor X- and γ-Ray Detectors, Associated Electronics and Applications. 380 (1–2): 266–270. Bibcode:1996NIMPA.380..266S. doi:10.1016/S0168-9002(96)00346-4.
- ^ Anthony, Seth (2014). I. Cognitive and instructional factors relating to students' development of personal models of chemical systems in the general chemistry laboratory. [...] (Thesis). Colorado State University. hdl:10217/82503.
- ^ US 3764368, Jacobs, J. & Corrigan, R., "Lead iodide film", published 9 October 1973
- ^ a b c Eastaugh, N.; Walsh, V.; Chaplin, T.; Siddall, R. (2004). The Pigment Compendium: a Dictionary of Historical Pigments. Butterworth-Heinemann. ISBN 978-0750657495.
- ^ Ahmad, S.; Prakash, G. V. (2012). "Fabrication of excitonic luminescent inorganic‑organic hybrid nano and microcrystals". International Conference on Fibre Optics and Photonics. OSA: MPo.40. doi:10.1364/photonics.2012.mpo.40.
- ^ a b Matuchova, M.; Zdansky, K.; Zavadil, J.; Danilewsky, A.; Riesz, F.; Hassan, M.A.S.; Alexiew, D.; Kral, R. (2009). "Study of the influence of the rare-earth elements on the properties of lead iodide". Journal of Crystal Growth. 311 (14): 3557–3562. Bibcode:2009JCrGr.311.3557M. doi:10.1016/j.jcrysgro.2009.04.043.
- ^ Chaudhuri, T.K.; Acharya, H.N. (1982). "Preparation of lead iodide films by iodination of chemically deposited lead sulphide films". Materials Research Bulletin. 17 (3): 279–286. doi:10.1016/0025-5408(82)90074-5.
- ^ Fleming, Declan (6 January 2015). "Golden rain". Education in Chemistry. 52 (1): 10.
- ^ Zhu, Xinghua; Wangyang, Peihua; Sun, Hui; Yang, Dingyu; Gao, Xiuying; Tian, Haibo (2016). "Facile growth and characterization of freestanding single crystal PbI2 film". Materials Letters. 180: 59–62. doi:10.1016/j.matlet.2016.05.101.
- ^ Fernelius, W. Conard; Detling, Kenneth D. (1934). "Preparation of crystals of sparingly soluble salts". Journal of Chemical Education. 11 (3): 176. Bibcode:1934JChEd..11..176F. doi:10.1021/ed011p176..
- ^ Patel, A.R.; Rao, A. Venkateswara (1980). "An improved design to grow larger and more perfect single crystals in gels". Journal of Crystal Growth. 49 (3): 589–590. Bibcode:1980JCrGr..49..589P. doi:10.1016/0022-0248(80)90134-7.
- ^ Scaife, C. W. J.; Cavoli, S. R.; Blanton, T. N.; Morse, M. D.; Sever, B. R.; Willis, W. S.; Suib, S. L. (1990). "Synthesis and characterization of lead(II) iodide grown in space". Chemistry of Materials. 2 (6): 777–780. doi:10.1021/cm00012a034.
- ^ a b c Fornaro, L.; Saucedo, E.; Mussio, L.; Yerman, L.; Ma, X.; Burger, A. (2001). "Lead iodide film deposition and characterization". Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 458 (1–2): 406–412. Bibcode:2001NIMPA.458..406F. doi:10.1016/S0168-9002(00)00933-5.
- ^ Liu, X.; Ha, S. T.; Zhang, Qing; de la Mata, M.; Magen, C.; Arbiol, J.; Sum, T. C.; Xiong, Q. (2015). "Whispering Gallery Mode Lasing from Hexagonal Shaped Layered Lead Iodide Crystals". ACS Nano. 9 (1): 687–695. doi:10.1021/nn5061207. hdl:10220/38493. PMID 25562110.
- ^ Tonn, J.; Matuchova, M.; Danilewsky, A. N.; Cröll, A. (2015). "Removal of oxidic impurities for the growth of high purity lead iodide single crystals". Journal of Crystal Growth. 416: 82–89. Bibcode:2015JCrGr.416...82T. doi:10.1016/j.jcrysgro.2015.01.024.
- ^ Forty, A. J. (August 1960). "Observations of the decomposition of crystals of lead iodide in the electron microscope". Philosophical Magazine. 5 (56): 787–797. Bibcode:1960PMag....5..787F. doi:10.1080/14786436008241217.
- ^ Popov, Georgi; Mattinen, Miika; Hatanpää, Timo; Vehkamäki, Marko; Kemell, Marianna; Mizohata, Kenichiro; Räisänen, Jyrki; Ritala, Mikko; Leskelä, Markku (2019-02-12). "Atomic Layer Deposition of PbI2 Thin Films". Chemistry of Materials. 31 (3): 1101–1109. doi:10.1021/acs.chemmater.8b04969.
- ^ Flora, G.; Gupta, D.; Tiwari, A. (2012). "Toxicity of lead: a review with recent updates". Interdisciplinary Toxicology. 5 (2): 47–58. doi:10.2478/v10102-012-0009-2. PMC 3485653. PMID 23118587.
- ^ "Haz-Map Category Details". hazmap.nlm.nih.gov. Retrieved 2016-04-29.
- ^ Sears, W. M.; Klein, M. L.; Morrison, J. A. (1979). "Polytypism and the vibrational properties of I2". Physical Review B. 19 (4): 2305–2313. Bibcode:1979PhRvB..19.2305S. doi:10.1103/PhysRevB.19.2305. hdl:11375/12129.
Cited sources
[edit]- Haynes, William M., ed. (2016). CRC Handbook of Chemistry and Physics (97th ed.). CRC Press. ISBN 9781498754293.
External links
[edit]
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