Abstract
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. By considering the bilinear coupling between acoustic and soft-optic modes, which is related to the order parameter, the inverse of relaxation time is estimated as a function of temperature below T0 in barium titanate. Our results are compared with the experimental data obtained from the light scattering spectra of this ferroelectric compound.
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