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, cilt.437, ss.137-148, 2012 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 437
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1080/00150193.2012.742343
  • Dergi Adı: FERROELECTRICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.137-148
  • Anahtar Kelimeler: Damping constant, relaxation time, hexagonal barium titanate, TEMPERATURE-DEPENDENCE, PHASE-TRANSITIONS, RAMAN-SCATTERING, NEUTRON-SCATTERING, PHONONS, SPECTROSCOPY, FREQUENCY, BATIO3
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

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.