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Order-Disorder Transition at High Temperature and Microdomain Formation in Oxidized Ferrites

Published online by Cambridge University Press:  21 February 2011

J.C. Grenier ,
M. Pouchard ,
P. Hagenmuller ,
M.J.R. Henche ,
M. Vallet ,
J.M.G. Calbet  and
M. A. Alario-Franco
J.C. Grenier
Affiliation:
Laboratoire de Chimie du Solide du CNRS, 351, cours de la Libération, 33405 Talence Cedex, France;
M. Pouchard
Affiliation:
Laboratoire de Chimie du Solide du CNRS, 351, cours de la Libération, 33405 Talence Cedex, France;
P. Hagenmuller
Affiliation:
Laboratoire de Chimie du Solide du CNRS, 351, cours de la Libération, 33405 Talence Cedex, France;
M.J.R. Henche
Affiliation:
Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense, Madrid-3, Spain.
M. Vallet
Affiliation:
Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense, Madrid-3, Spain.
J.M.G. Calbet
Affiliation:
Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense, Madrid-3, Spain.
M. A. Alario-Franco
Affiliation:
Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense, Madrid-3, Spain.
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Abstract

At high temperature, nonstoichiometric perovskite-type related ferrites can be oxidized in air. At first sight, this phenomenon appears rather surprising since it corresponds to a partial formation of iron +IV. Moreover a structural transition occurs from a vacancy ordering state to a pseudodisordering one characterized by a cubic perovskite-type X-ray diffraction pattern. A TEM study has shown in fact a more complex situation attributed to a microdomain texture. This is explained from a crystallographic point of view and correlated to the existence of mixed valencies of iron.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 21: Symposium GREECE – Phase Transformations in Solids , 1983 , 387
Copyright
Copyright © Materials Research Society 1984

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References

REFERENCES

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