Giant dielectric response and polaronic hopping in charge-ordered Nd1.75Sr0.25NiO4 ceramics
Giant dielectric response and polaronic hopping in charge-ordered Nd1.75Sr0.25NiO4 ceramics
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电荷有序 Nd1.75Sr0.25NiO4 陶瓷中的巨介电响应和极化跳跃
DOI：
10.1016/j.ssc.2010.07.011
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发表时间：
2010-10-01
影响因子：
2.1
通讯作者：
Chen, X. M.
中科院分区：
文献类型：
--
作者：
Liu, X. Q.;Wu, Y. J.;Chen, X. M.
研究了电荷有序Nd 1.75Sr 0.25NiO 4陶瓷的结构和介电性能。在频率高达5MHz的情况下，该陶瓷仍具有约30000的巨介电常数。在所考虑的温度范围内，在介电常数的温度依赖曲线上有三个介电弛豫。通过对介电弛豫激活能和电导激活能的比较，认为该陶瓷的巨介电响应应归因于体积因子，即热激活的小极化子跃迁，而室温附近的介电弛豫应归因于晶界效应。(C)2010爱思唯尔有限公司版权所有。
The structure and dielectric properties of charge-ordered Nd1.75Sr0.25NiO4 ceramics are presented. The giant dielectric constant about 30 000 is observed in the present ceramics even the frequency is up to 5 MHz. There are three dielectric relaxations at the curve of temperature dependence of dielectric constant in the considered temperature range. Based on the comparison of activation energies of dielectric relaxation and electrical conductivity, the giant dielectric response should be attributed to the bulk factor, that is, thermally activated small polaronic hopping in the present ceramics, while the dielectric relaxation around room temperature should cause from the effect of grain boundaries. (C) 2010 Elsevier Ltd. All rights reserved.