Calculation of the Damping Constant and the Relaxation Time for the Soft-Optic and Acoustic Mode in Hexagonal Barium Titanate


YURTSEVEN H. H. , Kiraci A.

FERROELECTRICS, vol.437, pp.137-148, 2012 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 437
  • Publication Date: 2012
  • Doi Number: 10.1080/00150193.2012.742343
  • Title of Journal : FERROELECTRICS
  • Page Numbers: pp.137-148

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.