Temperature Dependence of the Raman Frequency, Damping Constant and the Activation Energy of a Soft-Optic Mode in Ferroelectric Barium Titanate
FERROELECTRICS, vol.432, pp.14-21, 2012 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 432
- Publication Date: 2012
- Doi Number: 10.1080/00150193.2012.707592
- Journal Name: FERROELECTRICS
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Page Numbers: pp.14-21
- Keywords: Raman frequency, damping constant, activation energy, barium titanate, PHASE-TRANSITIONS, HEXAGONAL BATIO3, SCATTERING, DISORDER, PHONONS, DISPERSION, POLARITON, QUARTZ
- Middle East Technical University Affiliated: Yes
Abstract
The Raman frequency of a soft-optic mode associated with the order parameter is calculated as a function of temperature from the mean field theory for barium titanate (T-C = 222K). Using the Raman frequencies calculated, the damping constant is evaluated and it is compared with the observed one for this soft-optic mode.