High-pressure effect on PbTiO3: an investigation by Raman and x-ray scattering up to 63 GPa.
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.
Janolin
P-E
PE
Laboratoire Structures, Propriétés et Modélisation des Solides, CNRS-Ecole Centrale Paris, 92295 Châtenay-Malabry Cedex, France.
Bouvier
P
P
Kreisel
J
J
Thomas
P A
PA
Kornev
I A
IA
Bellaiche
L
L
Crichton
W
W
Hanfland
M
M
Dkhil
B
B