Aging-induced double ferroelectric hysteresis loops in BiFeO3 multiferroic ceramic
Aging-induced double ferroelectric hysteresis loops in BiFeO3 multiferroic ceramic
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DOI：
10.1063/1.2786013
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发表时间：
2007-09
影响因子：
4
通讯作者：
G. Yuan;Yurong Yang;S. Or
中科院分区：
文献类型：
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作者：
G. Yuan;Yurong Yang;S. Or
在室温下时效的BiFeO3多铁陶瓷中观察到双铁电迟滞（P-E）环，并将其解释为高活化能带电缺陷驱动的时效效应。时效后的BiFeO3表现出R3c缺陷对称性，在铁电居里温度下产生非零电荷缺陷诱导极化（PD）。该PD的强度足以在去除E后恢复180°切换的铁电畴，但对于71°/109°的铁电畴的有效切换却相当弱。结果表明，随着最大电流从121kv∕cm增加到167kv∕cm，双P-E回路的特性减弱。
Double ferroelectric hysteresis (P-E) loops are observed in aged BiFeO3 multiferroic ceramic at room temperature and are explained according to an aging effect driven by charged defects with high activation energy. The aged BiFeO3 shows R3c defect symmetry and allows a nonzero charged defect-induced polarization (PD) below the ferroelectric Curie temperature. This PD is strong enough to recover the switched 180° ferroelectric domains upon the removal of E, but it is rather weak to effectively switch back the 71°/109° ferroelectric domains. As a result, the traits of the double P-E loops weaken with increasing the maximum E from 121to167kV∕cm.