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1 results

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

  • Miguel Algueró, M. Lourdes Calzada, Lorena Pardo
  • Journal:
    Journal of Materials Research / Volume 14 / Issue 11 / November 1999
    Published online by Cambridge University Press:
    31 January 2011, pp. 4302-4306
    Print publication:
    November 1999

  • 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.