Temperature dependence of dielectric and electromechanical properties of (K,Na)(Nb,Ta)O3 single crystal and corresponding domain structure evolution

Limei Zheng; Junjun Wang; Xiaoqing Huo; Rui Wang; Shijing Sang; Shiyang Li; Peng Zheng; Wenwu Cao

doi:10.1063/1.4891718

Temperature dependence of dielectric and electromechanical properties of (K,Na)(Nb,Ta)O₃ single crystal and corresponding domain structure evolution

J Appl Phys. 2014 Jul 28;116(4):044105. doi: 10.1063/1.4891718. Epub 2014 Jul 30.

Authors

Limei Zheng, Junjun Wang¹, Xiaoqing Huo¹, Rui Wang², Shijing Sang¹, Shiyang Li³, Peng Zheng⁴, Wenwu Cao

Affiliations

¹ Condensed Matter Science and Technology Institute, Harbin Institute of Technology , Harbin 150080, China.
² Department of Chemistry, Harbin Institute of Technology , Harbin 150080, China.
³ Department of Instrument Science and Engineering, Shanghai Jiao Tong University , Shanghai 200240, China.
⁴ College of Electronics and Information, Hangzhou Dianzi University , Hangzhou 310018, China.

Abstract

Domain structures and their evolution with temperature in the [001] _C oriented (K,Na)(Nb,Ta)O₃ (KNNT) single crystal have been studied before and after poling by polarizing light microscopy. The results indicate that the KNNT crystal is difficult to be completely poled by the room temperature poling process. The domain structure is rather stable in the orthorhombic phase, but exhibits substantial changes near the phase transition temperatures T_O-T and T_C. Narrower stripe domains are formed during both the orthorhombic-tetragonal and tetragonal-cubic phase transition processes, no intermediate phases were found during the phase transitions. The temperature dependence of the dielectric and piezoelectric properties were measured, and the influence of domain structures on the dielectric and electromechanical properties were quantified.