Pressure induced soft mode phase transition in Bi 2Ti 4O 11 by Raman scattering

Abstract

The low frequency Raman spectra of Bi 2Ti 4O 11 have been investigated under hydrostatic pressure up to 9 GPa. A pressure induced soft mode phase transition occurs at 3.7 GPa. The half-width of the soft mode satisfies the relation Γ = Γ(0) t − 1 3 ( t is the reduced pressure ( P c - P)/ P c or temperature ( T c - T)/ T c) in the low pressure phase.