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, vol.432, pp.14-21, 2012 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 432
  • Publication Date: 2012
  • Doi Number: 10.1080/00150193.2012.707592
  • Journal Name: FERROELECTRICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.14-21
  • Keywords: Raman frequency, damping constant, activation energy, barium titanate, PHASE-TRANSITIONS, HEXAGONAL BATIO3, SCATTERING, DISORDER, PHONONS, DISPERSION, POLARITON, QUARTZ
  • Middle East Technical University Affiliated: Yes

Abstract

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.