6533b81ffe1ef96bd127797a
RESEARCH PRODUCT
Fine–grained spinel ferrites: From the reactivity to magnetic properties
B. Gillotsubject
Stress effectsChemistryInorganic chemistrySpinelKineticsCoercivityengineering.materialCondensed Matter PhysicsChemical synthesisElectronic Optical and Magnetic MaterialsengineeringReactivity (chemistry)Oxidation processElectrochemical gradientInstrumentationdescription
The oxidation at low temperature of fine-grained ferrites containing oxidizable cations such as Cu + , Fe 2+ , Mn 2+ , Mo 3+ , V 3+ , 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1998-12-01 | The European Physical Journal Applied Physics |