Anomalous pressure dependence of the atomic displacements in the relaxor ferroelectric PbMg{sub 1/3}Ta{sub 2/3}O{sub 3}
Journal Article
·
· Physical Review. B, Condensed Matter and Materials Physics
- Laboratory for Neutron Scattering ETHZ and Paul Scherrer Institut, CH-5232 Villigen PSI (Switzerland)
- Physique des Milieux Denses, IMPMC, CNRS-UMR 7590, Universite Pierre et Marie Curie, F-75252 Paris (France)
- Ioffe Physical Technical Institute, 26 Politekhnicheskaya, 194021, St. Petersburg (Russian Federation)
The crystal structure of the PbMg{sub 1/3}Ta{sub 2/3}O{sub 3} relaxor ferroelectric was studied under hydrostatic pressure up to {approx}7 GPa by means of powder neutron diffraction. We find a drastic pressure-induced decrease of the lead displacement from the inversion center, which correlates with an increase by {approx}50% of the anisotropy of the oxygen temperature factor. The vibrations of the Mg/Ta are, in contrast, rather pressure insensitive. We attribute these changes being responsible for the previously reported pressure-induced suppression of the anomalous dielectric permittivity and diffuse scattering in relaxor ferroelectrics.
- OSTI ID:
- 20788196
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 21 Vol. 73; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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