FERROELECTRICS, vol.432, pp.14-21, 2012 (SCI-Expanded)
Article / Article
Science Citation Index Expanded (SCI-EXPANDED), Scopus
Raman frequency, damping constant, activation energy, barium titanate, PHASE-TRANSITIONS, HEXAGONAL BATIO3, SCATTERING, DISORDER, PHONONS, DISPERSION, POLARITON, QUARTZ
Middle East Technical University Affiliated:
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.