FERROELECTRICS, vol.437, pp.137-148, 2012 (SCI-Expanded)
Article / Article
Science Citation Index Expanded (SCI-EXPANDED), Scopus
Damping constant, relaxation time, hexagonal barium titanate, TEMPERATURE-DEPENDENCE, PHASE-TRANSITIONS, RAMAN-SCATTERING, NEUTRON-SCATTERING, PHONONS, SPECTROSCOPY, FREQUENCY, BATIO3
Middle East Technical University Affiliated:
The temperature dependence of the damping constant is calculated below the transition temperature (T-0 = 222K) in the ferroelectric phase of hexagonal barium titanate. The damping constant of the coupled soft-optic and acoustic mode which causes an intense central peak in the light scattering spectra, is calculated using the soft mode-hard mode coupling model and the energy fluctuation model for barium titanate.