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Pressure Dependence of Instabilities in Perovskite PbZrO3

Published

Author(s)

Eric J. Cockayne, K M. Rabe

Abstract

We have computed the frequencies of selected normal modes in perovskite PbZrO3 (PZ) as a function of lattice parameter using local density functional theory variational linear response. The most significant instabilities that freeze in to give the orthorhombic antiferroelectric phase in PZ and the low-temperature rhombohedral ferroelectric phase in PbZr1-xTixO3 (PZT) all become more unstable under pressure. The most unstable antiferroelectric ς3 mode destabilizes more rapidly than the unstable zone center polar mode. This provides and explanation for the observed ferroelectric-antiferroelectric transition in (modified) Zr-rich PZT under applied pressure.
Citation
Journal of Physics and Chemistry of Solids
Volume
61

Keywords

DFT, first-principles calculations, LDA, lead zirconate, lead zirconate titanate, phonons, PZT

Citation

Cockayne, E. and Rabe, K. (2000), Pressure Dependence of Instabilities in Perovskite PbZrO<sub>3</sub>, Journal of Physics and Chemistry of Solids (Accessed May 27, 2024)

Issues

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Created January 21, 2000, Updated February 19, 2017