Jahn-Teller assisted polaronic electron hopping in LiCuNb3O9

Jahn-Teller assisted polaronic electron hopping in LiCuNb3O9
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LiCuNb3O9 中的 Jahn-Teller 辅助极化电子跳跃

DOI:
10.1016/j.jeurceramsoc.2020.11.034
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发表时间:
2020-11
影响因子:
5.7
通讯作者:
Chunchang Wang
Chunchang Wang
中科院分区:
材料科学1区
文献类型:
--
作者:
Rida Ahmed;Jingmin Wang;Renjun Si;S. ur Rehman;Tao Li;Hong Bi;Yi Yu;Qiuju Li;Yuting Li;S.G. Huang;Youmin Guo;Chunchang Wang

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用Li离子代替Cu离子,分析了A位元素在双钙钛矿型巨介电材料LiCuNb_3 O_9中的作用。结构分析表明,由于铜离子的Jahn-Teller效应的存在。两个热激活弛豫已被观察到:较低的温度已被指定为极化弛豫以下莫特可变范围跳跃机制。阻抗分析和湿敏实验证明,高温下的弛豫是麦克斯韦-瓦格纳弛豫。我们的工作强调,极化跳跃是负责的巨介电常数行为的LiCuNb 3 O 9。
Abstract The role of A-sited elements in double perovskite colossal dielectric LiCuNb3O9 has been analyzed by replacing the Cu ions with Li ions. Structural analysis revealed the presence of Jahn-Teller effect because of the Cu ions. Two thermally activated relaxations have been observed: the lower temperature one has been assigned to be a polaronic relaxation following Mott variable-range-hopping mechanism. Impedance analysis and humidity sensitive test proved that the higher temperature one is a Maxwell-Wagner relaxation. Our work highlights that the polaronic hopping is responsible for the colossal dielectric permittivity behavior of LiCuNb3O9.
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DOI: 10.1016/j.snb.2019.05.019
发表时间: 2019-08-15
影响因子: 8.4
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DOI: 10.1098/rspa.1937.0142
发表时间: 1937-07-01
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