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Crystallization of Perovskites from Solutions

Published online by Cambridge University Press:  15 February 2011

I. Maurin
Affiliation:
Laboratoire de Physique de la Matière Condensée, CNRS URA 1254D Ecole Polytechnique 91128 Palaiseau Cedex, France
P. Barboux
Affiliation:
Laboratoire de Physique de la Matière Condensée, CNRS URA 1254D Ecole Polytechnique 91128 Palaiseau Cedex, France
J. P. Boilot
Affiliation:
Laboratoire de Physique de la Matière Condensée, CNRS URA 1254D Ecole Polytechnique 91128 Palaiseau Cedex, France
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Abstract

LaMnO3 and PbZrO3 perovskites have been synthesized through coprecipitation and sol-gel techniques. After the drying and calcination steps, amorphous mixtures of oxides have been obtained. They are unstable towards phase separation. Therefore, their homogeneity and reactivity strongly depend on the parameters of the calcination, such as the temperature and heating rate. In all cases, the perovskite structure crystallizes around 600°C through nucleation- or diffusion-limited kinetics. The reaction rate depends on the history of the material. A mechanistic interpretation of the reaction, based on the similarity between the structures of PbO, ZrO2, Mn2O3 and La2O3 is proposed.

Type
Research Article
Copyright
Copyright © Materials Research Society 1997

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References

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