MECHANISM OF LA2CUO4 SOLID-STATE POWDER REACTION BY QUANTITATIVE XRD AND IMPEDANCE SPECTROSCOPY

被引：14

作者：

COOPER, EA ^{[1
]}

MASON, TO ^{[1
]}

机构：

[1] NORTHWESTERN UNIV,DEPT MAT SCI & ENGN,EVANSTON,IL 60208

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 1995年 / 78卷 / 04期

关键词：

D O I：

10.1111/j.1151-2916.1995.tb08406.x

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Reaction kinetics for CuO + La2O3 --> La2CuO4 were quantified by X-ray diffraction on quenched samples reacted in air. The rate was successfully modeled by the Valensi-Carter equation, taking into account the particle size distribution. Kinetics followed diffusion-limited rather than reaction-limited behavior; the activation energy was 265 kJ/mol. Conductivity-time behavior from in situ impedance spectra confirmed the reaction model; CuO rapidly coats the La2O3 particles and produces an La2CuO4 diffusion barrier. This is consistent with the basic assumptions of the Valensi-Carter equation. It is believed that copper diffusion controls the rate of reaction.

引用

页码：857 / 864

页数：8

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