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The effect of the distribution of vacancies on the magnetic properties of γ – Fe2O3 particles

Published online by Cambridge University Press:  03 March 2011

M.P. Morales ,
C. de Julián ,
J.M. González  and
C.J. Serna
M.P. Morales
Affiliation:
Instituto de Ciencia de Materiales de Madrid-CSIC, Serrano 115 dpdo., 28006 Madrid, Spain
C. de Julián
Affiliation:
Instituto de Ciencia de Materiales de Madrid-CSIC, Serrano 115 dpdo., 28006 Madrid, Spain
J.M. González*
Affiliation:
Instituto de Ciencia de Materiales de Madrid-CSIC, Serrano 115 dpdo., 28006 Madrid, Spain
C.J. Serna
Affiliation:
Instituto de Ciencia de Materiales de Madrid-CSIC, Serrano 115 dpdo., 28006 Madrid, Spain
*
a)Author to whom further correspoñdence should be addressed.
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Abstract

Samples of γ-Fe2O3 have been prepared from uniform α-Fe2O3 particles obtained by homogeneous hydrolysis in solution and directly by spray pyrolysis methods. The crystalline structure of these samples was analyzed by using x-ray and electron diffraction. It was concluded that, depending on the preparation method and parameters, different degrees of order in the distribution of vacancies were present. The study of the magnetic properties of these samples included the measurement of both intrinsic (saturation magnetization) and extrinsic properties (coercive force and magnetization behavior in the approach to saturation region). It was found that all the above-mentioned quantities depended on the degree of order in the distribution of vacancies.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 1 , January 1994 , pp. 135 - 141
Copyright
Copyright © Materials Research Society 1994

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References

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