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

Published online by Cambridge University Press:  15 February 2011

James A. Voigt ,
B.A. Tuttle ,
T.J. Headley  and
D.L. Lamppa
James A. Voigt
Affiliation:
Sandia National Laboratories, P.O. Box 5800, Albuquerque, NM 87185
B.A. Tuttle
Affiliation:
Sandia National Laboratories, P.O. Box 5800, Albuquerque, NM 87185
T.J. Headley
Affiliation:
Sandia National Laboratories, P.O. Box 5800, Albuquerque, NM 87185
D.L. Lamppa
Affiliation:
Sandia National Laboratories, P.O. Box 5800, Albuquerque, NM 87185
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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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 361: Symposium I2 – Ferroelectric Thin Films IV , 1994 , 395
Copyright
Copyright © Materials Research Society 1995

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References

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