钛酸锶的宽频带介电谱

无机材料学报

钛酸锶的宽频带介电谱

沈韩¹; 王卫林^1,2;席小玲², 陈敏¹; 李景德¹

1. 中山大学物理系, 广州 510275; 2. 江西宜春学院物理系, 宜春 336000

收稿日期:2001-12-27 修回日期:2002-01-21 出版日期:2003-01-20 网络出版日期:2003-01-20

Dielectric Spectroscopy of SrTiO₃ Ceramics in Wide Frequency Range

SHEN Han¹; WANG Wei-Lin^1,2; XI Xiao-Ling²; CHEN Min¹; LI Jing-De¹

1.Department of Physics; Zhongshan University; Guangzhou 510275; China; 2.Department of Physics; Yichun Institute; Yichun 336000; China

Received:2001-12-27 Revised:2002-01-21 Published:2003-01-20 Online:2003-01-20

摘要/Abstract

摘要： 利用计算机自动控制的超低频介电谱测量装置和HP4192A阻抗分析仪,在10^-4Hz-10⁵Hz宽达九个数量级的范围内测量了钛酸锶陶瓷的频域介电谱.其频域复介电常数可很好地拟合为两项之和.其中超低频项来自于晶界间空间电荷运动的贡献,高频项来自于晶粒内部空间电荷运动的贡献.高频项复介电常数的实部在频率增大时变为负值,这说明介电谱用频域方法来描述是有缺陷的,其测量结果无法用传统的介电极化理论加以解释.

关键词: 宽频带, 超低频, 介电谱, 钛酸锶

Abstract: By using computer controlled ultra-low frequency dielectric spectrometer and HP4124A impendence analyzer,
we measured the frequency domain dielectric spectrum of SrTiO₃ ceramics in the frequencies from 10^-4Hz to 10⁵Hz. The complex dielectric constants
obtained can be well extracted into the summation of two components. The lower frequency one can probably attribute to the motion of space charges
in grain boundaries, the higher frequency one can attribute to that within the grains. Further, real permittivity of the latter component changes to be
below zero at high frequencies. It indicates that frequency domain method is not a proper method for describing dielectric spectroscopy, while the
experimental results can not be explained by traditional dielectric polarization theory.

Key words: wide frequency range, ultra-low frequency, dielectric spectroscopy, SrTiO₃

中图分类号:

O482

沈韩,王卫林,席小玲, 陈敏,李景德. 钛酸锶的宽频带介电谱[J]. 无机材料学报.

SHEN Han,WANG Wei-Lin,XI Xiao-Ling,CHEN Min,LI Jing-De. Dielectric Spectroscopy of SrTiO₃ Ceramics in Wide Frequency Range[J]. Journal of Inorganic Materials.

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