Influence of stoichiometry on the magnetic disaccommodation in M-type Sr hexaferrites

The relaxation of the initial permeability has been measured in polycrystalline Sr hexaferrites with the initial composition SrO·nFe2O3 (n=5.7, 6), prepared by means of standard ceramic techniques in air as well as CO2 sintering atmospheres. The isochronal disaccommodation spectra show the presence...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2004-05, Vol.272-276, p.E1843-E1844
Main Authors: Hernández-Gómez, Pablo, Torres, Carlos, de Francisco, Carlos, Muñoz, José Marı́a, Alejos, Oscar, Iñiguez, José Ignacio, Raposo, Victor
Format: Article
Language:English
Subjects:
Hexaferrite
Magnetic aftereffect
Magnetic disaccommodation
Strontium ferrite
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Summary:The relaxation of the initial permeability has been measured in polycrystalline Sr hexaferrites with the initial composition SrO·nFe2O3 (n=5.7, 6), prepared by means of standard ceramic techniques in air as well as CO2 sintering atmospheres. The isochronal disaccommodation spectra show the presence of different relaxation processes, depending on both the sintering atmosphere and especially the initial composition, and associated to ionic reorientations of ferrous cations and lattice vacancies in the different metallic sites within the spinel (S) and hexagonal (R) blocks of the close packed lattice.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2003.12.887