Relaxor-like dielectric behavior in La2NiMnO6 double perovskite ceramics
Relaxor-like dielectric behavior in La2NiMnO6 double perovskite ceramics
复制标题
La2NiMnO6 双钙钛矿陶瓷中的类弛豫介电行为
DOI：
10.1016/j.ssc.2009.02.028
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发表时间：
2009-05-01
影响因子：
2.1
通讯作者：
Liu, X. Q.
中科院分区：
文献类型：
--
作者：
Lin, Y. Q.;Chen, X. M.;Liu, X. Q.
研究了La2NiMnO6双钙钛矿陶瓷的介电、导电特性及其晶体结构。La2NiMnO6陶瓷结晶为单斜晶型P2(1)/n结构，其中Ni2+和Mn4+离子周期性有序排列。在该陶瓷中观察到弛豫样介电行为与巨大介电常数阶跃相结合，这些独特的介电特性应归因于Ni2+和Mn4+的电荷有序性。经修正的Debye方程和Arrhenius定律可以很好地拟合介质弛豫，活化能为0.17 eV。La2NiMnO6的直流电导率可以用变范围跳变机制代替带传导机制来拟合。2009爱思唯尔有限公司版权所有。
The dielectric and conductive characteristics of La2NiMnO6 double perovskite ceramics were investigated together with the crystal structure. La2NiMnO6 ceramics crystallized in the monoclinic P2(1)/n structure in which the Ni2+ and Mn4+ ions ordered periodically. Relaxor-like dielectric behavior combined with a giant dielectric constant step was observed in the present ceramics, and these unique dielectric characteristics should be attributed to the charge ordering of Ni2+ and Mn4+. The dielectric relaxation was well fitted by the modified Debye equation and Arrhenius law with the activation energy of 0.17 eV. The dc conductivity of La2NiMnO6 could be well fitted using a variable-range hopping mechanism instead of a band conduction mechanism. (C) 2009 Elsevier Ltd. All rights reserved.