Defect structure-electrical property relationship in Mn-doped calcium strontium titanate dielectric ceramics
Defect structure-electrical property relationship in Mn-doped calcium strontium titanate dielectric ceramics
复制标题
锰掺杂钛酸钙锶介电陶瓷的缺陷结构与电性能关系
DOI：
10.1111/jace.14994
复制
发表时间：
2017
影响因子：
3.9
通讯作者：
Liu Hanxing
中科院分区：
文献类型：
--
作者：
Zhang Lin;Hao Hua;Zhang Shujun;Lanagan Michael T.;Yao Zhonghua;Xu Qi;Xie Juan;Zhou Jing;Cao Minghe;Liu Hanxing
采用固相反应法制备了不同Mn掺杂量（0-2.0mol%）的Ca0.6Sr0.4TiO3（CST）陶瓷。研究发现，0.5 mol% 的中等掺杂水平可以大大增强储能性能的电场和温度稳定性。介电损耗频率谱揭示了高温下缺陷偶极子的存在和演化，这由电子顺磁共振（EPR）谱直接证实。缺陷偶极子的响应通过热刺激去极化电流 (TSDC) 进行表征，其中计算了缺陷偶极子的活化能和浓度演化，并在 0.5% 掺杂样品中观察到最高值。通过高温阻抗谱分析，缺陷偶极子的解离和自由运动，活化能为1.04-1.60 eV，0.5%掺杂的样品也表现出最高的Ea。这项工作建立了微观缺陷结构与宏观电学行为之间的关系。
Ca0.6Sr0.4TiO3(CST) ceramics with different amounts of Mn dopant (0‐2.0 mol%) were prepared by solid‐state reaction method. The electric field and temperature stability of energy storage performance was found to be greatly enhanced with moderate doped level of 0.5 mol%. The dielectric loss‐frequency spectra revealed the existence and evolution of defect dipoles at elevated temperature, which was confirmed directly by electron paramagnetic resonance (EPR) spectra. The response of defect dipoles was characterized by thermally stimulated depolarization current (TSDC), where the activation energy and the concentration evolution of defect dipoles were calculated, with the highest values observed for 0.5% doped samples. The dissociation of defect dipoles and the movement of free were analyzed by high‐temperature impedance spectra analysis, with the activation energy of 1.04‐1.60 eV, and 0.5% doped samples also demonstrated the highestEa. The relationship between microscopic defect structure and macroscopic electrical behavior was established in this work.