Abstract

Defect structure in highly nonstoichiometric ferrous oxide has been discussed in terms of defect thermodynamics based on mass action law. It has been shown that the best agreement between theory and experiment is obtained under the assumption that 4:1 clusters, suggested by Cheetham and Catlow, are the predominant defects in the wustite phase. The ionization degree of these extended defects increases with increasing temperature, reaching a maximum value at 1573 K. Relative partial enthalpy and entropy of oxygen in Fe 1− y O were evaluated.

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