High-Pressure Effect on PbTiO 3 : An Investigation by Raman and X-Ray Scattering up to 63 GPa
2008; American Physical Society; Volume: 101; Issue: 23 Linguagem: Inglês
10.1103/physrevlett.101.237601
ISSN1092-0145
AutoresPierre‐Eymeric Janolin, Pierre Bouvier, J. Kreisel, P. A. Thomas, Igor Kornev, Laurent Bellaiche, Wilson A. Crichton, Michael Hanfland, Brahim Dkhil,
Tópico(s)High-pressure geophysics and materials
ResumoWe 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.
Referência(s)