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Effect of lanthanum content on the conduction behaviors and relaxation processes of lead lanthanum zirconate titanate antiferroelectric ceramics
Ceramics International ( IF 5.2 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.ceramint.2020.03.212
Xuewei Liang , Tianyuan Zhang , Zhangyuan Zhao , Kangjia Hu , Shenhou Li , Wenchang Hui , Yong Zhang

Abstract (Pb1-xLax) (Zr0.92Ti0.08)1-x/4O3 (PLZT x/92/8, x = 3, 5 and 7 at%) ceramics with compositions near the antiferroelectric (AFE)-ferroelectric (FE) phase boundary were fabricated by a solid-state reaction method. The effect of lanthanum content on the conduction behaviors and relaxation processes has been investigated. It was verified that the main phase with orthorhombic structure was formed in all compositions. The increase of lanthanum substitution resulted in an enhancement of diffuse phase transition. Impedance analysis suggested that the ac conductivity decreased with increasing lanthanum content. Moreover, thermally stimulated depolarization current study was utilized to establish the correlation between defect structures and relaxation processes. It showed three peaks with distinct characteristics, which originated from dipole orientation, oxygen vacancy migration and phase transition respectively. The oxygen vacancy-related defects induced by lanthanum doping were mainly responsible for the variation of conduction behaviors and relaxation processes.

中文翻译:

镧含量对锆钛酸铅镧反铁电陶瓷导电行为和弛豫过程的影响

摘要 (Pb1-xLax) (Zr0.92Ti0.08)1-x/4O3 (PLZT x/92/8, x = 3, 5 和 7 at%) 陶瓷,其成分接近反铁电 (AFE)-铁电 (FE)相界是通过固态反应法制备的。已经研究了镧含量对导电行为和弛豫过程的影响。经证实,在所有组合物中均形成具有斜方结构的主相。镧取代的增加导致扩散相变的增强。阻抗分析表明交流电导率随着镧含量的增加而降低。此外,利用热刺激去极化电流研究来建立缺陷结构与弛豫过程之间的相关性。它显示了三个具有鲜明特征的峰,分别源于偶极子取向、氧空位迁移和相变。镧掺杂引起的氧空位相关缺陷是导致导电行为和弛豫过程变化的主要原因。
更新日期:2020-07-01
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