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Fine–grained spinel ferrites: From the reactivity to magnetic properties

Published online by Cambridge University Press:  15 December 1998

B. Gillot
B. Gillot*
Affiliation:
Laboratoire de Recherche sur la Réactivité des Solides (UMR 5613), Université de Bourgogne, 9 avenue Alain Savary, BP 400, 21011 Dijon Cedex, France
*
bgillot@satie.u-bourgogne.fr
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Abstract

The oxidation at low temperature of fine-grained ferrites containing oxidizable cations such as Cu+, Fe2+, Mn2+, Mo3+, V3+, has led to new mixed-valent cation deficient ferrites with a large number of vacancies. It has been demonstrated by DTG analysis that each cation oxidizes at a specific temperature in close relation with the cation-oxygen distance. The kinetics oxidation of each oxidizable cation has been explained on the basis of a diffusion-induced stress effect when these stresses are generated by the chemical gradient induced during the oxidation process. When fine-grained ferrites contain some Co-cations, it has been revealed that the stresses have a significant influence on the enhancement of the coercivity.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 4 , Issue 3 , December 1998 , pp. 243 - 250
Copyright
© EDP Sciences, 1998

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