Mechanism of La2CuO4 solid-state powder reaction by quantitative XRD and impedance spectroscopy

Elizabeth A. Cooper, Thomas O Mason

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)857-864
Number of pages8
JournalJournal of the American Ceramic Society
Volume78
Issue number4
Publication statusPublished - Apr 1995

ASJC Scopus subject areas

  • Ceramics and Composites

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