Role of lower valent substituent-oxygen vacancy complexes in polarization pinning in potassium-modified lead zirconate titanate
Role of lower valent substituent-oxygen vacancy complexes in polarization pinning in potassium-modified lead zirconate titanate
复制标题
DOI：
10.1063/1.124394
复制
发表时间：
1999-07-19
影响因子：
4
通讯作者：
Viehland, D
中科院分区：
文献类型：
--
作者：
Tan, Q;Li, JX;Viehland, D
用Sawyer-Tower极化方法研究了K1+修饰的PZT(PZT)陶瓷的极化转换与热历史的关系。研究发现，从铁电相变温度以上淬火样品，可以将时效状态下的类双环偏振特性逆转为正常的单环偏振特性。然而，在高温下再老化后，P-E曲线反转到双环状特征。La~(3+)修饰的PZT中的过量氧空位不会导致双环极化滞后，而K~(1+)修饰的PZT中的过量氧缺位会导致双环极化滞后。这些结果为K1+-氧空位复合体在极化钉扎中的作用提供了证据。(C)1999年美国物理研究所。[S00036951(99)00929]。
The dependence of polarization switching on thermal histories has been investigated for K1+-modified lead zirconate titanate (PZT) ceramics by Sawyer-Tower polarization methods. It was found that double-loop-like polarization characteristics in the aged condition could be reversed to normal single loop polarization characteristics by quenching specimens from above the ferroelectric phase transition temperature. However, the P-E curves reversed back to double-loop-like characteristics after reaging specimens at elevated temperatures. Excess oxygen vacancies in La3+-modified PZT were not found to result in double-loop-like polarization hysteresis, whereas excess oxygen vacancies in K1+-modified PZT did. These results provide evidence for role of K1+-oxygen vacancy complexes in polarization pinning. (C) 1999 American Institute of Physics. [S0003-6951(99)00929].