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-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 432
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1080/00150193.2012.707592
  • Dergi Adı: FERROELECTRICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.14-21
  • Anahtar Kelimeler: Raman frequency, damping constant, activation energy, barium titanate, PHASE-TRANSITIONS, HEXAGONAL BATIO3, SCATTERING, DISORDER, PHONONS, DISPERSION, POLARITON, QUARTZ
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

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.