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Pyrochlore-to-perovskite transformation during rapid heating of sol-gel (Pb,La)TiO3 thin films

Published online by Cambridge University Press:  31 January 2011

Miguel Algueró ,
M. Lourdes Calzada  and
Lorena Pardo
Miguel Algueró
Affiliation:
Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Cientificas, Cantoblanco 28049, Madrid, Spain
M. Lourdes Calzada
Affiliation:
Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Cientificas, Cantoblanco 28049, Madrid, Spain
Lorena Pardo
Affiliation:
Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Cientificas, Cantoblanco 28049, Madrid, Spain
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Abstract

Phases appearing in lanthanum-modified lead titanate thin films prepared by a diol-based sol-gel method and crystallized by rapid heating were studied. The results clearly indicate that a phase transformation from a pyrochlore structure to the perovskite phase occurs in Pb-deficient films during the thermal treatment, which involves a heating rate higher than 500 °C min−1. The rate of this transformation is a function of the lead content of the films, decreasing as lead volatilizes. Temperatures higher than 650 °C or soak times longer than 2 h make possible the complete pyrochlore-to-perovskite transformation without any lead excess in the films.

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Articles
Information
Journal of Materials Research , Volume 14 , Issue 11 , November 1999 , pp. 4302 - 4306
Copyright
Copyright © Materials Research Society 1999

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References

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