Evolution of electromechanical properties in Fe-doped (Pb,Sr)(Zr,Ti)O3 piezoceramics
Evolution of electromechanical properties in Fe-doped (Pb,Sr)(Zr,Ti)O3 piezoceramics
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DOI：
10.1007/s40145-021-0460-7
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发表时间：
2021-02-24
影响因子：
16.9
通讯作者：
Wang, Ke
中科院分区：
文献类型：
--
作者：
Chen, Chuan;Wang, Yan;Wang, Ke
受主掺杂的钙钛矿型压电材料中的缺陷对其电学性能有显著影响。本文系统地研究了Fe掺杂（Pb，Sr）（Zr，Ti）O-3（PSZT-Fe）压电陶瓷在淬火、时效、去时效和极化等不同处理条件下，缺陷介导的压电和铁电性能的演变。具有立方对称性的氧空位保留在淬火PSZT-Fe陶瓷中，使其具有鲁棒的铁电行为。在时效态PSZT-Fe多晶中，Fe掺杂与氧空位之间的缺陷偶极子与自发极化P-S取向一致，使畴变可逆，从而导致箍缩极化滞后和可恢复应变效应的出现。双极电场循环可以逐渐破坏缺陷偶极子，再次赋予老化材料代表性的铁电性能。对于极化的PSZT-Fe多晶，缺陷偶极子被重新取向为平行于所施加的极化场，并且同时出现沿沿着相同方向排列的内部偏置场，这是负责非对称磁滞回线。
Defects in acceptor-doped perovskite piezoelectric materials have a significant impact on their electrical properties. Herein, the defect mediated evolution of piezoelectric and ferroelectric properties of Fe-doped (Pb,Sr)(Zr,Ti)O-3 (PSZT-Fe) piezoceramics with different treatments, including quenching, aging, de-aging, and poling, was investigated systematically. Oxygen vacancies with a cubic symmetry are preserved in the quenched PSZT-Fe ceramics, rendering them robust ferroelectric behaviors. In the aged PSZT-Fe polycrystals, defect dipole between Fe dopant and oxygen vacancy has the same orientation with spontaneous polarization P-S, which enables the reversible domain switching and hence leads to the emergence of pinched polarization hysteresis and recoverable strain effect. And the defect dipoles can be gradually disrupted by bipolar electric field cycling, once again endowing the aged materials with representative ferroelectric properties. For the poled PSZT-Fe polycrystals, the defect dipoles are reoriented to be parallel to the applied poling field, and an internal bias field aligning along the same direction emerges simultaneously, being responsible for asymmetric hysteresis loops.