Temperature dependence of oxidation behavior and coercivity evolution in fine-grained spinel ferrites

6533b851fe1ef96bd12aa04c

RESEARCH PRODUCT

Temperature dependence of oxidation behavior and coercivity evolution in fine-grained spinel ferrites

B. Gillot Philippe Tailhades

subject

Materials science Spinel Analytical chemistry chemistry.chemical_element Magnetostriction Cation distribution Coercivity engineering.material Condensed Matter Physics Redox Electronic Optical and Magnetic Materials symbols.namesake chemistry Faraday effect symbols engineering Cobalt

description

Abstract The present paper reviews for a series of fine-grained MxCoyFe(3−x−y)O4 spinel ferrites (M=Mn, Mo, Cu, V) which oxidize into mixed-valence defect ferrites, a systematic study of the correlation between the oxidation temperature and the variation of coercivity. An increase of the coercivity is observed as often as the oxidation reactions Fe2+→Fe3+ and Mn+→M(n+m)+ (1⩽m⩽3) occur. This enhancement of coercivity has been explained by stresses generated during each specific oxidation reaction. The well-known property of cobalt to strongly magnify the magnetostrictive effects has been used to support this interpretation.

year	journal	country	edition	language
2000-01-01	Journal of Magnetism and Magnetic Materials

https://doi.org/10.1016/s0304-8853(99)00591-0

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