Investigation of the depolarisation transition in Bi-based relaxor ferroelectrics
Investigation of the depolarisation transition in Bi-based relaxor ferroelectrics
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DOI：
10.1063/1.4869132
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发表时间：
2014-03-21
影响因子：
3.2
通讯作者：
Thomas, Pam A.
中科院分区：
文献类型：
--
作者：
Woodward, David I.;Dittmer, Robert;Thomas, Pam A.
用电学和结构方法研究了掺杂BiZn1/2Ti1/2O3的弛豫铁电（Na0.8K0.2）（1/2）Bi1/2TiO3陶瓷的宏观极化损失。这些表明，在位移相变中耦合的现象不一定耦合在na1 / 2bi1 / 2tio3基弛豫剂的去极化中，并且使用相邻单元胞内偶极子的相关和不相关开关的概念来解释这一点。在加热过程中对极化陶瓷进行二次谐波产生，产生冻结温度值，并显示出类似于100℃的宽温度范围，该温度范围内结构从场致铁电转变为平衡态遍行弛豫。室温下的电极化导致极化区域的尺寸增加了大约2个数量级。描述了热去极化的主要步骤的模型，该模型不需要在单元胞水平上发生相变。(C) 2014作者。除另有说明外，所有文章内容均采用知识共享署名3.0未移植许可协议。
The loss of macroscopic polarisation in relaxor ferroelectric (Na0.8K0.2)(1/2)Bi1/2TiO3 ceramics doped with BiZn1/2Ti1/2O3 has been studied by electrical and structural methods. These indicate that the phenomena that are coupled in a displacive phase transition are not necessarily coupled in the depolarisation of Na1/2Bi1/2TiO3-based relaxors and a concept of correlated and uncorrelated switching of dipoles within adjacent unit cells is used to explain this. Second harmonic generation performed on poled ceramics during heating yields values of the freezing temperature and shows a broad temperature range of similar to 100 degrees C across which the structure changes from field-induced ferroelectric to an equilibrium-state ergodic relaxor. Electrical poling at room temperature causes poled regions to increase in size by similar to 2 orders of magnitude. A model illustrating the main steps in thermal depolarisation is described that does not require a phase transition to take place on a unit cell level. (C) 2014 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.