Temperature Dependence of the Raman Frequency, Damping Constant and the Activation Energy of a Soft-Optic Mode in Ferroelectric Barium Titanate
FERROELECTRICS, cilt.432, ss.14-21, 2012 (SCI-Expanded, Scopus)
- 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.