Enhanced bipolar fatigue resistance in PMN-PZT ceramics prepared by spark plasma sintering
Enhanced bipolar fatigue resistance in PMN-PZT ceramics prepared by spark plasma sintering
复制标题
放电等离子烧结制备的 PMN-PZT 陶瓷的双极疲劳性能增强
DOI：
10.1016/j.ceramint.2017.11.051
复制
发表时间：
2018-03-01
影响因子：
5.2
通讯作者：
Dong, Xianlin
中科院分区：
文献类型：
--
作者：
Chen, Caiyun;Liang, Ruihong;Dong, Xianlin
系统研究了常规烧结（CS）和放电等离子烧结（SPS）制备的镁铝酸铅-锆钛酸铅（PMN-PZT）陶瓷的双极疲劳行为。SPS样品的大信号（极化，应变）和小信号（压电系数，介电常数）滞后曲线的演变的比较分析，观察到显着增强的双极抗疲劳性。抗疲劳性能的提高不仅归因于晶粒尺寸和孔隙率的减小抑制了微裂纹的发展，而且还与迁移点缺陷，特别是氧空位引起的畴壁钉扎效应的减少有关。此外，不同的相结构及其在极化和疲劳时的演变也是提高疲劳抗力的原因。
The bipolar fatigue behaviors of lead magnesium niobate-lead zirconate titanate (PMN-PZT) ceramics sintered by conventional sintering (CS) and spark plasma sintering (SPS) were systematically investigated. Significantly enhanced bipolar fatigue resistance was observed for SPS samples by a comparative analysis of the evolution of both large signal (polarization, strain) and small signal (piezoelectric coefficient, permittivity) hysteresis curves. The enhanced fatigue resistance is not only attributed to the suppressed development of microcracks, which is due to the decrease in grain size and porosity, but is also related to the reduction of domain wall pinning effect induced by migratory point defects, especially oxygen vacancies. Besides, the different phase structure and its evolution upon poling and fatigue are also responsible for the enhanced fatigue resistance.