Anomalous pressure dependence of the atomic displacements in the relaxor ferroelectric PbMg$_{1/3}$Ta$_{2/3}$O$_3$

S. N. Gvasaliya; V. Pomjakushin; B. Roessli; Th. Straessle; S. Klotz; S. G. Lushnikov

doi:10.1103/PhysRevB.73.212102

paper

Anomalous pressure dependence of the atomic displacements in the relaxor ferroelectric PbMg $_{1/3}$ Ta $_{2/3}$ O $_{3}$

arXiv:cond-mat/0602339 · doi:10.1103/PhysRevB.73.212102

Abstract

The crystal structure of the PbMg $_{1/3}$ Ta $_{2/3}$ O $_{3}$ (PMT) relaxor ferroelectric was studied under hydrostatic pressure up to $\sim 7$ GPa by means of powder neutron diffraction. We find a drastic pressure-induced decrease of the lead displacement from the inversion centre which correlates with an increase by $\sim$ 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.

Anomalous pressure dependence of the atomic displacements in the relaxor ferroelectric PbMg1/3​Ta2/3​O3​

Abstract

References in corpus (3)

Anomalous pressure dependence of the atomic displacements in the relaxor ferroelectric PbMg $_{1/3}$ Ta $_{2/3}$ O $_{3}$