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BY-NC-ND 4.0 license Open Access Published by De Gruyter (O) January 7, 2014

Pressure evolution of PbMgNbO relaxor ferroelectric

  • Dmitry Chernyshov EMAIL logo , Vadim Dyadkin , Vladimir Dmitriev and Alexey Bossak

Abstract

Diffuse and Bragg scattering of synchrotron radiation on single crystal PMN relaxor has been collected as a function of pressure. The relaxor-specic diffuse scattering (DS) is observed for p < 40 kbar and successfully parametrized with the thermal DS-like model of polar correlations. An increase of pressure does suppress the polar correlations in a specic glass-like relaxor state, and above ~40 kbar a new non-polar R-phase becomes stable. We propose a phenomenological model accounting for off-center displacements of lead ions; together with previous reports these findings map the relaxor state to a specifc area of phase diagram.

Received: 2013-04-09
Accepted: 2013-10-30
Published Online: 2014-01-07
Published in Print: 2014-03

© 2014 by Walter de Gruyter Berlin Boston

This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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