Thermally stimulated depolarization current properties of Co4Nb2O9 ceramics
Thermally stimulated depolarization current properties of Co4Nb2O9 ceramics
复制标题
Co4Nb2O9陶瓷的热刺激去极化电流特性
DOI：
10.1111/jace.16162
复制
发表时间：
2019
影响因子：
3.9
通讯作者：
Wang CunCang
中科院分区：
文献类型：
--
作者：
Xie Yuanmiao;Zang Hao;Ceng Wendan;Wang CunCang
研究了磁电反铁磁体Co_4Nb_2O_9在Néel温度以上的热激去极化电流，观察到5个电流峰（P0 ~ P4）.这些峰与可以被钴空位、其周围介质（自陷）、内部和表面势垒层俘获的空穴有关。在低温范围内，空穴与钴空位结合。束缚空穴引起的极化在46 K产生P0峰。在中温范围内，空穴被周围的介质局部化，形成极化子。自陷空穴的跳跃运动在~120 K处产生P2峰。自陷空穴在其定位位置附近的微位移导致P1峰，其峰值温度强烈依赖于极化温度，但低于P2峰。在高温范围内，空穴被内部和表面势垒层捕获，分别在~150 K和~230 K产生P3峰和P4峰。
Thermally stimulated depolarization current in magnetoelectric antiferromagnet Co4Nb2O9were investigated above Néel temperature, and five current peaks (denoted as P0 ~ P4 in the order of ascending temperature) were observed. These peaks are related to holes which can be trapped by cobalt vacancies, their surrounding medium (self‐trapped), internal, and surface barrier layers. In low‐temperature range, the holes are bound to cobalt vacancies. The polarization caused by bound holes yields P0 peak at 46 K. In middle‐temperature range, the holes are localized by the surrounding medium forming polarons. The hopping motions of the self‐trapped holes create P2 peak at ~120 K. The microdisplacements around their locating positions for the self‐trapped holes lead to P1 peak, whose peak temperature strongly depends on the poling temperature but lower than that of P2 peak. In high‐temperature range, the holes are trapped by internal and surface barrier layers giving rise to P3 peak at ~150 K and P4 peak at ~230 K, respectively.