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

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 PbMg $_{1 / 3}$ Ta $_{2 / 3}$ O $_{3}$

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

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Anomalous pressure dependence of the atomic displacements in the relaxor ferroelectric PbMg1/31/3​Ta2/32/3​O33​

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Anomalous pressure dependence of the atomic displacements in the relaxor ferroelectric PbMg1/31/3​Ta2/32/3​O33​

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

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

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