title: High pressure Raman investigations of multiferroic BiFeO(3).
abstract: We have reported a Raman scattering investigation of bismuth ferrite (BiFeO(3)) under high pressure up to 50 GPa. Distinct changes in the Raman spectra show evidence for three pressure-induced structural transitions. The abrupt frequency redshifts of the Raman modes near 300 cm(-1) at around 3 GPa are attributed to the modulation of the FeO(6) octahedral tilts. The disappearance of the modes below 250 cm(-1) at 8.6 GPa, together with the enhancement of the two modes in the range of 300-400 cm(-1), indicate the phase transition from the rhombohedral to orthorhombic symmetry. Afterward, the E-3 and E-4 modes disappear at 44.6 GPa, pointing to the occurrence of the orthorhombic-cubic phase transition, which is consistent with the previous postulate that an orthorhombic-cubic transition takes place across the metal-insulator transition at high pressures.
authors.affiliation: Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
authors.forename: Y
authors.initials: Y
authors.lastname: Yang
authors.forename: L G
authors.initials: LG
authors.lastname: Bai
authors.forename: K
authors.initials: K
authors.lastname: Zhu
authors.forename: Y L
authors.initials: YL
authors.lastname: Liu
authors.forename: S
authors.initials: S
authors.lastname: Jiang
authors.forename: J
authors.initials: J
authors.lastname: Liu
authors.forename: J
authors.initials: J
authors.lastname: Chen
authors.forename: X R
authors.initials: XR
authors.lastname: Xing