MRS Proceedings

Table of Contents - Volume  361  - Symposium I2 – Ferroelectric Thin Films IV  

Editors : S.B. Desu, R. Ramesh, T. Shiosaki, B.A. Tuttle

Articles

The Pyrochlore-to-Perovskite Transformation in Solution-Derived Lead Zirconate Titanate Thin Films

1994 MRS Fall Meeting.

James A. Voigta1, B.A. Tuttlea1, T.J. Headleya1 and D.L. Lamppaa1

a1 Sandia National Laboratories, P.O. Box 5800, Albuquerque, NM 87185

ABSTRACT

We have characterized the pyrochlore-to-perovskite crystallization process in solution-derived Pb(Zr0.20Ti0.80)O3 thin films on (100) MgO single crystal substrates. It has been determined that the perovskite phase nucleated preferentially at the film/MgO interface out of a nanocrystalline (≈100Å grains) pyrochlore matrix. During the early stages of the pyrochlore-to-perovskite conversion process, perovskite growth proceeded nearly isotropically from the substrate to form hemispherically shaped grains. Deviations from isotropie growth were shown to result from a growth dependence based on the crystallographic orientation of a growing perovskite grain relative to the orientations of pyrochlore grains being transformed. The volume change that occurs during the pyrochlore-to-pervoskite transformation along with two-dimensional grain growth has been used to develop a mechanism for formation of porosity that commonly is concentrated in grain boundary regions.

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