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Availability of Fe2+ions in Cr- or Al-substituted magnetites with relevance to the process of oxidation in defect phase γ

Authors
Journal
Journal of Solid State Chemistry
0022-4596
Publisher
Elsevier
Publication Date
Volume
45
Issue
3
Identifiers
DOI: 10.1016/0022-4596(82)90177-3
Disciplines
  • Earth Science

Abstract

Abstract During oxidation of the aluminum- or chromium-substituted magnetites, (Fe 2+Fe 3+ 2− x M 3 f x)O 2− 4, with 0.4 < x < 1.8 in defect phase γ of the same spinel structure, the availability for oxidation of Fe 2+ ions in the tetrahedral sites (A sites) of the spinel structure is much less than that in octahedral sites (B sites) and in both cases depends on the extent of aluminum or chromium substitution. The influence of cation distribution in A and B sites on the oxidation temperature is shown directly by differential thermogravimetric analysis and by electrical conductivity.

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