ELECTROCHEMICAL EXCITATION METHOD IN KINETIC-STUDY OF AG2S

被引：8

作者：

DING, SP ^{[1
]}

PETUSKEY, WT ^{[1
]}

机构：

[1] ARIZONA STATE UNIV,DEPT CHEM,TEMPE,AZ 85287

来源：

SOLID STATE IONICS | 1992年 / 58卷 / 1-2期

关键词：

D O I：

10.1016/0167-2738(92)90019-L

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：

A steady-state electrochemical method of sinusoidal excitation has been developed in which the chemical diffusion coefficient of an atomic species in a solid is obtained via the determination of the spatial distribution of the phase and amplitude of its chemical potential oscillation. It has been applied to Ag2+deltaS to measure the chemical diffusion coefficient D of Ag in alpha-Ag2+deltaS at 168-degrees-C and in beta-Ag2+deltaS at 220-degrees-C, with a typical precision of 0.2%. The measurements were performed at frequencies from 0.02 to 0. 1 6 Hz, with delta covering the whole nonstoichiometry range. The values of D measured fell between 0.01 and 0. 1 5 cm2/s at 168-degrees-C and between 0.08 and 0.32 cm2/s at 220-degrees-C, changing significantly with delta but slightly with f The component diffusion coefficient of Ag+ was determined for beta-Ag2+deltaS to be in the range of 3.0 to 3.6 x 10(-5) cm2/s, decreasing with a frequency dependence with increasing delta.

引用

页码：123 / 132

页数：10

共 27 条

[1] THE CHEMICAL DIFFUSION-COEFFICIENT IN (LOW-TEMPERATURE) ALPHA-AG2S DETERMINED BY AN ELECTROCHEMICAL RELAXATION METHOD [J].