Calculation of the Damping Constant and the Relaxation Time for the Soft-Optic and Acoustic Mode in Hexagonal Barium Titanate
FERROELECTRICS, cilt.437, ss.137-148, 2012 (SCI-Expanded, Scopus)
- 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.