Abstract
Over the temperature range 250—600°C, the oxidation of submicrometre-sized manganese-substituted magnetites depends on oxygen pressure because the presence of manganese ions leads to redox phenomena. Below 400°C, within the single-phase region of the cation-deficient spinel, a quantitative analysis by DTG of oxidizable cations allows the defect concentration associated with partial oxidation of manganese ions in tetrahedral sites to be related to oxygen pressure. Above 550°C, the oxidation of manganese ions not oxidized previously is accompanied by a structural change, but the nature of the inversion products again depends markedly on oxygen pressure.
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