Orientation dependence of dielectric and piezoelectric properties of (K0.95Li0.05) (Ta0.40Nb0.60) O-3 single crystal
Orientation dependence of dielectric and piezoelectric properties of (K0.95Li0.05) (Ta0.40Nb0.60) O-3 single crystal
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(K0.95Li0.05)(Ta0.40Nb0.60)O-3单晶介电和压电性能的取向依赖性
DOI：
10.1016/j.ceramint.2015.01.064
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发表时间：
2015
影响因子：
5.2
通讯作者：
Bhalla Amar S.
中科院分区：
文献类型：
--
作者：
Li Jun;Li Yang;Zhou Zhongxiang;Guo Ruyan;Bhalla Amar S.
采用顶部籽晶熔融法生长了（K0.95Li0.05）（Ta0.40Nb0.60）O3（简称0.60：KLTN）单晶。在a方向和c方向上的介电性能研究表明，样品具有很高的各向异性，未极化样品的ε11=2130，ε33=371。压电常数和机电耦合系数分别为d15 =190 pC/N，d31=−140 pC/N，d33=400 pC/N，k15= 49.4%，k31 =56.2%，k33 = 75.0%。采用沿着唯象的数学方法模拟了晶体取向对介电、压电和机电耦合特性的影响。这些结果将用于开发高性能的无铅压电器件。
(K0.95Li0.05) (Ta0.40Nb0.60) O3(abbreviated as 0.60: KLTN) single crystal has been grown by the top-seeded melt growth method. Dielectric properties in thea- andc-direction have been investigated, and the high anisotropy has been found.ε11=2130, whileε33=371 were determined in the unpoled sample. The piezoelectric constants and electromechanical coupling factors have been determined which ared15=190 pC/N,d31=−140 pC/N,d33=400 pC/N,k15=49.4%,k31=56.2% andk33=75.0%. The crystal orientation dependences of dielectric, piezoelectric and electromechanical coupling properties have been simulated by using the mathematical approach along with phenomenology of the system. These results will be of use for developing high performance lead-free piezoelectric devices.