title: 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.
authors.affiliation: Laboratoire Structures, Propriétés et Modélisation des Solides, CNRS-Ecole Centrale Paris, 92295 Châtenay-Malabry Cedex, France.
authors.forename: P-E
authors.initials: PE
authors.lastname: Janolin
authors.forename: P
authors.initials: P
authors.lastname: Bouvier
authors.forename: J
authors.initials: J
authors.lastname: Kreisel
authors.forename: P A
authors.initials: PA
authors.lastname: Thomas
authors.forename: I A
authors.initials: IA
authors.lastname: Kornev
authors.forename: L
authors.initials: L
authors.lastname: Bellaiche
authors.forename: W
authors.initials: W
authors.lastname: Crichton
authors.forename: M
authors.initials: M
authors.lastname: Hanfland
authors.forename: B
authors.initials: B
authors.lastname: Dkhil