Polar and chemical states at a nanometer scale in a PbSc1/2Nb1/2O3-PbTiO3 system investigated by Raman spectroscopy - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review Année : 2006

Polar and chemical states at a nanometer scale in a PbSc1/2Nb1/2O3-PbTiO3 system investigated by Raman spectroscopy

Résumé

We have investigated the whole phase diagram of PbSc1/2Nb1/2O3-PbTiO3 (PSN-PT) solid solution by Raman scattering and compared the results to our recent x-ray and theoretical study on this system [R. Haumont , Phys. Rev. B 71, 104106 (2005)]. Changes in the vibration bands associated to the sequence of phase transitions R3m-Cm-Pm-P4mm by doping PSN with Ti4+ were evidenced, especially between the two monoclinic phases. The detailed analysis also pointed out that the monoclinic order probably already exists into the rhombohedral and the tetragonal phases on a local scale which makes the morphotropic phase region (MPR) more extended than it was reported. Moreover, besides the polar states this Raman analysis evidences the strong chemical inhomogeneities existing on a nanometer scale in such relaxor-based system such as the Ti-rich and Sc/Nb-rich regions.
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hal-00133259 , version 1 (24-02-2007)

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Brahim Dkhil, Jean-Michel Kiat, R. Haumont, P. Gemeiner, Alain Bulou. Polar and chemical states at a nanometer scale in a PbSc1/2Nb1/2O3-PbTiO3 system investigated by Raman spectroscopy. Physical Review, 2006, 73, pp.104106. ⟨10.1103/PhysRevB.73.104106⟩. ⟨hal-00133259⟩
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