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Ferroelectrics Volume 302, 2004 - Issue 1
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Original Articles

Effect of High Pressure on the Relaxor Ferroelectrics Na1/2Bi1/2TiO3 (NBT) and PbMg1/3Nb2/3O3 (PMN)

J. KREISEL Laboratoire des Matériaux et du Génie Physique ENS de Physique de Grenoble, B.P. 46, St. Martin d'Hères, France, 38402
,
P. BOUVIER Laboratoire d'Electrochimie et de Physicochimie des Matériaux et des Interfaces, ENSEEG, BP 75, St. Martin d'Hères, Cedex, France, 38402
,
B. DKHIL Laboratoire Structures Propriétés et Modéelisation des Solides Ecole Centrale Paris, Châtenay-Malabry, France, 92290
,
B. CHAABANE Laboratoire des Matériaux et du Génie Physique ENS de Physique de Grenoble, B.P. 46, St. Martin d'Hères, France, 38402
,
A. M. GLAZER Clarendon Laboratory University of Oxford Parks Road, Oxford, United Kingdom, OX1 3PU
,
P. A. THOMAS Department of Physics University of Warwick Coventry, United Kingdom, CV4 7AL
&
T. R. WELBERRY Research School of Chemistry Australian National University, Canberra, ACT, Australia, 0200
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Pages 293-298 | Received 01 Aug 2003, Accepted 01 Jan 2004, Published online: 08 Sep 2010
 
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Abstract

The aim of the present paper is to review and briefly discuss recent experimental results on the effect of high pressure (p > 1.5 GPa) on relaxor ferroelectrics, exemplified by Na1/2Bi1/2TiO3 and PbMg1/3Nb2/3O3. The main result is that relaxor ferroelectrics present important polar and structural pressure-instabilities, which lead to both phase transitions of the average structure and considerable changes of the local structure. It is in particular the observation of a pressure-induced suppression of the relaxor-characteristic X-ray diffuse scattering that points to important changes in the local order. The complementary use of Raman spectroscopy, X-ray diffraction and X-ray diffuse scattering allows the proposition of a mechanism for the observed changes.

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