Dielectric relaxation and polaronic conduction in double perovskite La2MgMnO6

被引：58
|
作者：
Lin, Y. Q. [1 ]
Chen, X. M. [1 ]
机构：
[1] Zhejiang Univ, Dept Mat Sci & Engn, Lab Dielect Mat, Hangzhou 310027, Peoples R China
来源：
APPLIED PHYSICS LETTERS | 2010年 / 96卷 / 14期
基金：
美国国家科学基金会;
关键词：
ceramics; dielectric relaxation; hopping conduction; lanthanum compounds; magnesium compounds; polarons; X-ray photoelectron spectra; TRANSPORT-PROPERTIES; MAGNETORESISTANCE;
D O I：
10.1063/1.3377906
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The dielectric and conductive characteristics of double perovskite La2MgMnO6 were investigated together with the mixed-valence structure. The magnetic characterization and x-ray photoemission spectroscopy analysis showed the co-presence of Mn3+ and Mn4+. A Debye type dielectric relaxation with an activation energy of 0.33 eV was observed in La2MgMnO6 ceramics. The relaxorlike dielectric characteristic was attributed to the dipolar effects coming from charge carrier hopping between Mn3+ and Mn4+. The dc conductivity of La2MgMnO6 was well fitted using adiabatic small polaron theory, and also correlated with the mixed-valence structure of Mn3+/Mn4+.
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页数：3
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