电介质
材料科学
退火(玻璃)
活化能
放松(心理学)
氧气
凝聚态物理
表层
介电损耗
分析化学(期刊)
图层(电子)
化学
光电子学
纳米技术
复合材料
物理化学
有机化学
物理
社会心理学
色谱法
心理学
作者
C. C. Wang,L. W. Zhang
摘要
Low-frequency (∼100Hz) dielectric properties of CaCu3Ti4O12 were investigated in detail near room temperature. A dielectric relaxation peak was observed at about 250 K with an activation energy of 0.54 eV. This peak can be tuned by annealing treatment in nitrogen and oxygen. The results can be well explained by considering the surface-layer effect. The inhomogeneous distribution of oxygen vacancies leads to the formation of surface layer, resulting in the observed Maxwell–Wagner-type dielectric relaxation.
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