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

Authors :: Kreisel, J.
Bouvier, P.
Dkhil, B.
Chaabane, B.
Glazer, A.M.
Thomas, P.A.
Welberry, T.R.
Source :: Ferroelectrics; 2004, Vol. 302 Issue 1, p539-544, 6p, 10 Color Photographs, 2 Diagrams, 1 Graph
Publication Year :: 2004
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 Na<subscript>½</subscript>Bi<subscript>½</subscript>TiO<subscript>3</subscript> and PbMg<subscript>⅓</subscript>Nb<subscript>2/3</subscript>O<subscript>3</subscript>. 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 relaxorcharacteristic 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. [ABSTRACT FROM AUTHOR]

Subjects :: HIGH pressure (Science)
RELAXATION phenomena
FERROELECTRIC crystals
FERROELECTRICITY
POLARIZATION (Electricity)
ELECTRIC properties of crystals

Full Text Access

Tools