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

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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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Authors and Affiliations

  1. Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Cientificas, Cantoblanco, 28049, Madrid, Spain

    Miguel Algueró, M. Lourdes Calzada & Lorena Pardo

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  1. Miguel Algueró
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  2. M. Lourdes Calzada
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  3. Lorena Pardo
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Algueró, M., Calzada, M.L. & Pardo, L. Pyrochlore-to-perovskite transformation during rapid heating of sol-gel (Pb,La)TiO3 thin films. Journal of Materials Research 14, 4302–4306 (1999). https://doi.org/10.1557/JMR.1999.0583

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  • DOI: https://doi.org/10.1557/JMR.1999.0583

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