Chemical diffusion in mixed conductors: alpha'-Ag-2 Te and beta-Ag2Se

被引：15

作者：

Sitte, W

机构：

[1] Technische Universitaet Graz, Graz, Austria

来源：

SOLID STATE IONICS | 1997年 / 94卷 / 1-4期

关键词：

chemical diffusion coefficient; component diffusion coefficient; conductivity diffusion coefficient; polarization measurements; mixed conductor; silver telluride; silver selenide;

D O I：

10.1016/S0167-2738(96)00584-X

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The silver chalcogenides alpha'-Ag2+deltaTe and beta-Ag2+deltaSe represent two contrary examples regarding the composition dependence of the chemical diffusion coefficient. Whereas in the vicinity of the stoichiometric composition the coulometric titration curve of beta-Ag2Se is determined by the chemical potential of the silver ions (due to its cationic Frenkel disorder), the coulometric titration curve of alpha-Ag2Te is determined by the chemical potentials of the electrons (due to its structural disorder). The experimentally determined maximum of the chemical diffusion coefficient, in the case of alpha-Ag2+deltaTe, near the stoichiometric point as well as the monotonic decrease of the chemical diffusion coefficient with decreasing silver activity in the case of beta-Ag2+delta Se, can be explained in detail.

引用

页码：85 / 90

页数：6

共 27 条

[1]

ANDREAUS R, 1994, IONIC MIXED CONDUCTI, V9412, P250

[2]

ANDREAUS R, UNPUB J ELECTROCHEM

[3] IONIC AND ELECTRONIC PROCESSES IN AGCRSE2 [J].