Aluminium diboride: Difference between revisions

| verifiedrevid = 418541969

| ImageFile = Magnesium-diboride-3D-balls.png

| OtherNames = aluminium boride

|Section1={{Chembox Identifiers

| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}

| PubChem = 24884166

| CASNo_Ref = {{cascite|correct|??}}

| EINECS = 234-923-7

| SMILES = B1=B[Al]1

|Section2={{Chembox Properties

| Formula = AlB₂

| MolarMass = 48.604 g/mol<ref name=b92>{{RubberBible92nd|page=4.45}}</ref>

| Appearance = Copper-red solid

| Density = 3.19 g/cm³<ref name=b92/>

| MeltingPt = >920 °C

| MeltingPt_notes = (decomposes)<ref name=b92/>

| BoilingPt =

| Solubility = insoluble

|Section3={{Chembox Structure

| Structure_ref =<ref>{{cite journal|doi=10.1021/ja01604a003|title=The Preparation of Aluminium Diboride, AlB21|journal=Journal of the American Chemical Society|volume=78|issue=23|pages=5977–5978|year=1956|last1=Felten|first1=Edward J}}</ref>

| CrystalStruct = Hexagonal, [[Pearson symbol|hP3]]

| SpaceGroup = P6/mmm, No. 191

| LattConst_a = 0.3009 nm

| LattConst_b = 0.3009 nm

| LattConst_c = 0.3262 nm,

| LattConst_alpha = 90

| LattConst_beta = 90

| LattConst_gamma = 120

| UnitCellFormulas =1

}}

|Section4={{Chembox Thermochemistry

| DeltaHf = -151 kJ/mol

| Entropy = 34.7 J/mol K

| HeatCapacity = 43.6 J/mol K

|Section7={{Chembox Hazards

| MainHazards =

| FlashPt =

| AutoignitionPt =

'''Aluminium diboride''' (AlB₂) is a [[chemical compound]] made from the metal [[aluminium]] and the [[metalloid]] [[boron]]. It is one of two compounds of aluminium and boron, the other being [[aluminium dodecaboride|AlB₁₂]], which are both commonly referred to as aluminium boride.

Structurally the B atoms form [[graphite]]-like sheets with Al atoms between them, and this is very similar to the structure of [[magnesium diboride]]. Single crystals of AlB₂ exhibit metallic conductivity along the axis parallel to the basal hexagonal plane.<ref>{{cite journal|title=On the electronic and structural properties of aluminium diboride Al_0.9B₂|journal=Journal of Solid State Chemistry |volume=177 |issue=2 |pages=389 |doi=10.1016/j.jssc.2002.12.001 |year=2004 |last1=Burkhardt |first1=U |last2=Gurin |first2=Vladimir |last3=Haarmann |first3=Frank |last4=Borrmann |first4=Horst |last5=Schnelle |first5=Walter |last6=Yaresko |first6=Alexander |last7=Grin |first7=Yuri |bibcode=2004JSSCh.177..389B }}</ref>

Aluminium boride is considered a hazardous substance as it reacts with [[acid]]s and [[hydrogen]] gas to produce toxic gases. For example, it reacts with hydrochloric acid to release [[borane]] and [[aluminium chloride]].

The crystal structure of AlB₂ is often used as a prototype structure to describe [[intermetallic compounds]]. There are a large number of [[structure type]]s that fall within the AlB₂ structural family.<ref>{{cite journal | last1=Hoffmann | first1=R.-D. | last2=Pöttgen | first2=Rainer | title=AlB₂-related intermetallic compounds – a comprehensive view based on group-subgroup relations | journal=Zeitschrift für Kristallographie - Crystalline Materials | publisher=Walter de Gruyter GmbH | volume=216 | issue=3 | date=2001-01-01 | pages=127–145 | issn=2196-7105 | doi=10.1524/zkri.216.3.127.20327 | bibcode=2001ZK....216..127H | s2cid=98251655 }}</ref>

*[[Boride]]

==External links==

*[https://web.archive.org/web/20081218043037/http://nautilus.fis.uc.pt/st2.5/scenes-e/elem/e00530.html "Boron"];

{{Borides}}