Oxidation of Manganese Ferrite

The oxidation of manganese ferrite (MnFe2O4) in air has been studied in the temperature range 750° to 1150°C. Between 1050° and 1150° a homogeneous oxidation takes place, resulting in a spinel phase of a defect type containing up to 10% of the manganese in the trivalent state. At 1050° and below, bi...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 1957-04, Vol.40 (4), p.139-142
Main Author: WEISZ, R. S.
Format: Article
Language:English
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Summary:The oxidation of manganese ferrite (MnFe2O4) in air has been studied in the temperature range 750° to 1150°C. Between 1050° and 1150° a homogeneous oxidation takes place, resulting in a spinel phase of a defect type containing up to 10% of the manganese in the trivalent state. At 1050° and below, bixbyite (Mn2O3) and hematite (Fe2O3) are precipitated. The kinetics indicate that initially a diffusion‐limited homogeneous reaction takes place, followed by precipitation and grain growth. At lower temperatures, well‐defined Widmanstätten precipitates are formed; at higher temperatures, recrystallization alters these precipitates. The oxidation of manganese ferrite can be strongly retarded by a ceramic glaze, offering a practical method of preparing the material by air firing.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.1957.tb12590.x