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Study of metal-ferrite composites: complementary use of 57Fe Mössbauer spectrometry, X-ray diffraction and TG analysis

Published online by Cambridge University Press:  15 April 2002

N. Viart ,
G. Pourroy  and
J.-M. Greneche
N. Viart*
Affiliation:
Institut de Physique et Chimie des Matériaux de Strasbourg, Groupe des Matériaux Inorganiques (UMR 7504), 23 rue du Loess, 67037 Strasbourg Cedex, France
G. Pourroy
Affiliation:
Institut de Physique et Chimie des Matériaux de Strasbourg, Groupe des Matériaux Inorganiques (UMR 7504), 23 rue du Loess, 67037 Strasbourg Cedex, France
J.-M. Greneche
Affiliation:
Laboratoire de Physique de l'État Condensé (UMR 6087), Université du Maine, avenue O. Messiaen, BP 535, 72085 Le Mans Cedex 9, France
*
[email protected]
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Abstract

The complementarity between 57Fe Mössbauer spectrometry and classical methods of powder characterizations is pointed out for determining the formula of metal-ferrite composites (Fe$_p^0$Co$_{1-p}^0$)a(CoxFe$_{3-x-t}$$\square_t$O4). It is shown that X-ray diffraction is essential to determine the composition of the metal, while TG measurements in air give an approximate value for the metal ratio. In-field spectrometry is expected as the most suitable tool to determine the Fe sites occupancy, although the complex hyperfine structure might originate some misfits. The composites formulae were therefore determined by selecting the set of refined Mössbauer parameters that were in best agreement with the TG measurements. Magnetic measurements prove the validity of such an approach.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 18 , Issue 1 , April 2002 , pp. 33 - 40
Copyright
© EDP Sciences, 2002

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