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Issue Eur. Phys. J. Appl. Phys.
Volume 18, Number 1, April 2002
Page(s) 33 - 40
Section Characterization of Materials
DOI 10.1051/epjap:2002024



Eur. Phys. J. AP 18, 33-40 (2002)
DOI: 10.1051/epjap:2002024

Study of metal-ferrite composites: complementary use of $\mathsf{^{57}}$Fe Mössbauer spectrometry, X-ray diffraction and TG analysis

N. Viart1, G. Pourroy1 and J.-M. Greneche2

1  Institut de Physique et Chimie des Matéériaux de Strasbourg, Groupe des Matéériaux Inorganiques (UMR 7504) , 23 rue du Loess, 67037 Strasbourg Cedex, France
2  Laboratoire de Physique de l'État Condensé (UMR 6087) , Universitéé du Maine, avenue O. Messiaen, BP 535, 72085 Le Mans Cedex 9, France

viart@ipcms.u-strasbg.fr

(Received: 2 July 2001 / Received in final form: 21 November 2001 / Accepted: 7 January 2002 )

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 p0Co 1-p0) a(Co xFe 3-x-t $\square_t$O 4). 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.

PACS
77.84.Lf - Composite materials.
76.80.+y - Mössbauer effect; other $\gamma$-ray spectroscopy.
81.20.Fw - Sol-gel processing, precipitation.


© EDP Sciences 2002


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