A comparative study of the polarization degradation mechanisms during electric cycling in (Bi1/2Na1/2)TiO3-based relaxors
A comparative study of the polarization degradation mechanisms during electric cycling in (Bi1/2Na1/2)TiO3-based relaxors
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DOI：
10.1016/j.scriptamat.2019.11.061
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发表时间：
2020-03
影响因子：
6
通讯作者：
Z. Fan;X. Tan
中科院分区：
文献类型：
--
作者：
Z. Fan;X. Tan
铁电陶瓷在电场循环过程中的极化退化与相组成密切相关。本文对（1-x）（Bi_（1/2）Na_（1/2））TiO_3-xSrTiO_3弛豫体进行了电偏置原位透射电子显微镜（TEM）疲劳试验。它是直接观察到的陶瓷ofx= 0.25功能的不可逆的弛豫铁电相变和畴壁在亚稳铁电相扫描越来越短的距离在循环过程中。相比之下，x = 0.27的陶瓷具有可逆的弛豫-铁电转变，并且即使在104次循环后，瞬态铁电相中的畴壁仍保持高度移动的。
The polarization degradation during electric field cycling in a ferroelectric ceramic is closely related to the phase composition. In the present work, electric biasingin-situtransmission electron microscopy (TEM) fatigue tests are conducted on relaxors of (1–x)(Bi1/2Na1/2)TiO3–xSrTiO3. It is directly observed that the ceramic ofx= 0.25 features an irreversible relaxor-ferroelectric phase transition and the domain walls in the metastable ferroelectric phase sweep shorter and shorter distances during cycling. In contrast, the ceramic ofx= 0.27 features a reversible relaxor-ferroelectric transition and the domain walls in the transient ferroelectric phase remain highly mobile even after 104cycles.