A Mossbauer investigation of Sr sub(1-x)La sub(x) Fe sub(12)O sub(19) (0 [< or =] x [< or =] 1) M-type hexaferrites

Sr sub(1-x)La sub(x)Fe sub(12)O sub(19) hexaferrite powders prepared using a standard ceramic process were investigated by Mossbauer spectrometry, thus allowing investigating the influence of the Sr super(2+)/La super(3+) substitution on the five Fe sublattices in the whole range of composition. Ver...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2015-08, Vol.470-471, p.33-38
Main Authors: Le Breton, Jean-Marie, Seifert, Daniela, Topfer, Jorg, Lechevallier, Luc
Format: Article
Language:English
Subjects:
Accounting
Ceramics
Condensed matter
Evolution
Iron
Lattice parameters
Mossbauer effect
Spectrometry
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Summary:Sr sub(1-x)La sub(x)Fe sub(12)O sub(19) hexaferrite powders prepared using a standard ceramic process were investigated by Mossbauer spectrometry, thus allowing investigating the influence of the Sr super(2+)/La super(3+) substitution on the five Fe sublattices in the whole range of composition. Very satisfactory fittings are obtained accounting for the Fe super(2+)/Fe super(3+) charge compensation mechanism at the 2a site due to the replacement of Sr super(2+) by La super(3+). The evolutions of the hyperfine parameters (hyperfine field, isomer shift and quadrupolar shift) of the contributions related to the five iron sites are continuous. They are interpreted in relation with the Sr super(2+)/La super(3+) substitution. The results show that the 12k, 4f sub(2) and 2b sites are the most affected by the substitution, in agreement with both the evolution of the lattice constants and the fact that these three sites have Sr sites in their close vicinity.
ISSN:0921-4526
DOI:10.1016/j.physb.2015.05.003