Raman study of phase transition in ferroelectric Ba_(0.95)Ca_(0.05)TiO_3

摘要

Raman scattering investigation of phase transition in the ferroelectric Ba_(0.95)Ca_(0.05)TiO_3 is reported. The results suggest onset of significant dynamic disorder at 105℃. This corroborates findings of recent structural study regarding large positional disorder associated with Ti and O1 atoms well below the tetragonal to cubic transition temperature (～150℃).