PERMITTIVITY AND AC CONDUCTIVITY IN YTTRIA-STABILIZED ZIRCONIA - APPLICATION OF A PAIRS-APPROXIMATION MODEL AND DETERMINATION OF THE BINDING-ENERGY OF THE OXYGEN VACANCIES

被引：40

作者：

HENN, FEG ^{[1
]}

BUCHANAN, RM ^{[1
]}

JIANG, N ^{[1
]}

STEVENSON, DA ^{[1
]}

机构：

[1] STANFORD UNIV,DEPT MAT SCI & ENGN,STANFORD,CA 94305

来源：

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING | 1995年 / 60卷 / 05期

关键词：

D O I：

10.1007/BF01538778

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Alternating current (ac) conductivity and permittivity measurements were carried out on yttria-stabilized cubic zirconia, with yttria varying from 9.6 to 25.5 mol%. In this composition range, the dielectric constant measured at 10(3) Hz decreased from 29.8 to 23.2 as the yttria concentration increased. A plot of the ac conductivity versus frequency exhibited a plateau conductivity (sigma(dc)) and a frequency (omega) dependent term sigma'(omega). An analysis of sigma'(omega) with a suitable theoretical approach based on a pairs-approximation model, resulted in a calculated binding energy for the yttrium-associated oxygen vacancy of 0.29 +/- 0.05 eV, which compares favorably with values obtained by different means in previous studies. The experimental determination of the frequency dependence of the conductivity and its analysis provides an effective basis for understanding the ionic conductivity mechanism.

引用

页码：515 / 519

页数：5

共 14 条

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