High-Pressure Effect on PbTiO3 : An Investigation by Raman and X-Ray Scattering up to 63 GPa

Abstract : We report a room-temperature high-pressure x-ray and Raman scattering investigation of lead titanate (PbTiO3) up to 63 GPa. Three continuous phase transitions at 13, 20, and 45 GPa between tetragonal-like phases occur. As a result, no evidence is found for a pressure-induced morphotropic phase boundary. Our study provides experimental evidence that PbTiO3 presents a complex sequence of phases accommodating pressure through mechanisms involving oxygen octahedra tilting and reentrance of ferroelectricity.
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Physical Review Letters, American Physical Society, 2008, 101 (23), pp.237601. 〈10.1103/PhysRevLett.101.237601〉
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Pierre-Eymeric Janolin, P. Bouvier, J. Kreisel, P.A. Thomas, Igor Kornev, et al.. High-Pressure Effect on PbTiO3 : An Investigation by Raman and X-Ray Scattering up to 63 GPa. Physical Review Letters, American Physical Society, 2008, 101 (23), pp.237601. 〈10.1103/PhysRevLett.101.237601〉. 〈hal-00357963〉

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