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Raman scattering; phase transition; ferroelectric

Raman scattering investigation of phase transition in the ferroelectric Ba_0.95Ca_0.05TiO₃ is reported. The results suggest onset of significant dynamic disorder at 105°C. 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°C).

Rekha Rao¹ A P Roy² B A Dasannacharya³ S Balakumar⁴ R Ilangovan⁴ P Ramasamy⁴

1. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai - 400 085, India
2. Spectroscopy Division, Bhabha Atomic Research Centre, Mumbai - 400 085, India
3. Inter-University Consortium for DAE Facilities, University Campus, Khandwa Road, Indore - 452 001, India
4. Crystal Growth Centre, Anna University, Madras - 600 025, India

Published

August 1996

Manuscript received

10 June 1996