Abstract
The influence of cation distribution on the reactivity in oxygen of finely grained ferrous spinels is shown directly by differential thermogravimetric analysis during oxidation of these spinels in defect phase γ. The authors give several examples drawn from Al- or Cr-substituted magnetites, titanomagnetites and Mn-substituted magnetites, where the oxidation process might be closely associated with the nature, charge, and position of cations in the octahedral and tetrahedral sites of the spinel structure. The difference of reactivity of Fe 2+ cations in relation to occupied sites has been used to determine the cation distributions in titanomagnetites. For Mn-substituted magnetites the availability for oxidation of Mn 2+ ions in tetrahedral sites is much less than that of Fe 2+ and Mn 3+ ions in octahedral sites.
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