Structural and Phase Transitions in the High Composition Domain of the System (1-x)Pb(Mg^sub 1/3^Nb^sub 2/3^)O^sub 3^ - xPbTiO^sub 3

Raman scattering, dielectric studies, powder and single crystal X-ray diffraction on 0.6Pb(Mg1/3Nb2/3)O3-0.4PbTiO3 (PMN-40PT) and 0.55Pb(Mg1/3Nb2/3)O3-0.45PbTiO3 (PMN-45PT) were carried out over a wide temperature range. Dielectric plots of PMN-45PT revealed two phase transitions with a sharp maximu...

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Bibliographic Details
Published in:Ferroelectrics 2010-05, Vol.400 (1), p.362
Main Authors: Wang, H, Laval, J-P, Ehrenberg, H, Fuess, H, Arrii-Clacens, S, Luo, H, Elouadi, B
Format: Article
Language:English
Subjects:
Crystal structure
Dielectric properties
Diffraction
Diffusion
Ferroelectrics
Phase transitions
Temperature
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Summary:Raman scattering, dielectric studies, powder and single crystal X-ray diffraction on 0.6Pb(Mg1/3Nb2/3)O3-0.4PbTiO3 (PMN-40PT) and 0.55Pb(Mg1/3Nb2/3)O3-0.45PbTiO3 (PMN-45PT) were carried out over a wide temperature range. Dielectric plots of PMN-45PT revealed two phase transitions with a sharp maximum at TC (paraelectric-ferroelectric transition at 485 K, from cubic to tetragonal with respective space groups Pm-3m and P4mm similar to PMN-40PT) and a second broad Raman shift at around 225 K. The Raman investigations confirmed the existence of phase transitions in PMN-45PT crystals, and the lowest frequency behaves like a soft mode. The appearance of diffuse scattering at room temperature in PMN-45PT suggests a phase distinct from PMN-40PT below TC. The identification of the symmetry in this temperature region will be further demonstrated. [PUBLICATION ABSTRACT]
ISSN:0015-0193
1563-5112