Temperature Dependence of the Raman Frequency, Damping Constant and the Activation Energy of a Soft-Optic Mode in Ferroelectric Barium Titanate

Kiraci A., YURTSEVEN H. H.

FERROELECTRICS, cilt.432, ss.14-21, 2012 (SCI İndekslerine Giren Dergi) identifier identifier


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.