Oxygen-vacancy-related low-frequency dielectric relaxation and electrical conduction in Bi:SrTiO3
Oxygen-vacancy-related low-frequency dielectric relaxation and electrical conduction in Bi:SrTiO3
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DOI：
10.1103/physrevb.62.228
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发表时间：
2000-07-01
影响因子：
3.7
通讯作者：
Cross, LE
中科院分区：
文献类型：
--
作者：
Ang, C;Yu, Z;Cross, LE
在10 ~ 800 K温度范围内测量了（ST_（1 - 1.5）x_（Bix））TiO_3（0.0133 ≤ x ≤ 0.133）的介电性能和电导率随温度的变化关系。观察到三组与氧空位相关的介电峰（峰A、B和C）。这些峰可以通过在氧化气氛中退火样品而被大大抑制或消除，并且通过在还原气氛中退火而被增强或重新产生。结果表明，Maxwell-Wagner极化不是主要机制，Skanavi模型也不能直接应用。有人提出了一种尝试性的解释。在100-350 K的温度范围内观察到的峰A，其介电弛豫激活能E-relaxA = 0.32-0.49 eV，归因于导电电子与偏心Bi和Ti离子的运动的耦合效应;在该温度范围内的导电载流子来自氧空位（V-0）的第一电离。还讨论了峰B和C。
The temperature dependence of dielectric properties and electrical conduction of (ST1-1.5xBix)TiO3 (0.0133 less than or equal to x less than or equal to 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-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-0). Peaks B and C are also discussed.