Eur. Phys. J. AP
Volume 4, Number 3, December 1998
|Page(s)||243 - 250|
|Published online||15 December 1998|
Fine–grained spinel ferrites: From the reactivity to magnetic properties
Laboratoire de Recherche sur la
Réactivité des Solides (UMR 5613),
de Bourgogne, 9 avenue Alain Savary,
BP 400, 21011 Dijon Cedex, France
Corresponding author: email@example.com
Revised: 3 September 1998
Accepted: 3 September 1998
Published online: 15 December 1998
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.
PACS: 02.70.Dh – Finite-element and Galerkin methods / 75.50.Vv – High coercivity materials / 81.20.Ka – Chemical synthesis; combustion synthesis Chemical vapor deposition
© EDP Sciences, 1998
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