Effect of high pressure on the relaxor ferroelectrics Na<sub>1/2</sub>Bi<sub>1/2</sub>TiO<sub>3</sub> (NBT) and PbMg<sub>1/3</sub>Nb<sub>2/3</sub>O<sub>3</sub> (PMN) - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Ferroelectrics Année : 2004

Effect of high pressure on the relaxor ferroelectrics Na1/2Bi1/2TiO3 (NBT) and PbMg1/3Nb2/3O3 (PMN)

Résumé

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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Matériaux
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Dates et versions

hal-00417872 , version 1 (17-09-2009)

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Jens Kreisel, Pierre Bouvier, B. Dkhil, B. Chaabane, A. Michael Glazer, et al.. Effect of high pressure on the relaxor ferroelectrics Na1/2Bi1/2TiO3 (NBT) and PbMg1/3Nb2/3O3 (PMN). Ferroelectrics, 2004, 302 (1), pp. 293-298. ⟨10.1080/00150190490455269⟩. ⟨hal-00417872⟩
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