电介质
退火(玻璃)
材料科学
热传导
大气温度范围
氧气
放松(心理学)
电子
活化能
凝聚态物理
分析化学(期刊)
核磁共振
物理
原子物理学
热力学
化学
物理化学
心理学
社会心理学
光电子学
量子力学
色谱法
复合材料
作者
Ang Chen,Zhi Yu,L. E. Cross
出处
期刊:Physical review
日期:2000-07-01
卷期号:62 (1): 228-236
被引量:872
标识
DOI:10.1103/physrevb.62.228
摘要
The temperature dependence of dielectric properties and electrical conduction of $({\mathrm{Sr}}_{1\ensuremath{-}1.5x}{\mathrm{Bi}}_{x}){\mathrm{TiO}}_{3} (0.0133<~x<~0.133)$ was measured from 10 to 800 K. Three sets of oxygen vacancies related dielectric peaks (peaks A, B, and $C)$ were observed. These peaks could be greatly suppressed or eliminated by annealing the samples in an oxidizing atmosphere, and enhanced or recreated by annealing in a reducing atmosphere. The results show that the Maxwell-Wagner polarization is not the main mechanism, and the Skanavi's model also cannot be directly applied. A tentative explanation was suggested. Peak A, observed in the temperature range of 100--350 K with the activation energy for dielectric relaxation ${E}_{\mathrm{relaxA}}=0.32--0.49$ eV, is attributed to the coupling effect of the conduction electrons with the motion of the off-centered Bi and Ti ions; the conduction carriers in this temperature range are from the first ionization of oxygen vacancies ${(V}_{o}).$ Peaks B and C are also discussed.
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