Calculation of the damping constant and the order parameter for the lattice mode in ferroelectric PbTiO3

Kiraci A., YURTSEVEN H. H.

IEEE International Symposium on the Applications of Ferroelectric / Workshop on the Piezoresponse Force Microscopy (ISAF/PFM), Prague, Çek Cumhuriyeti, 21 - 25 Temmuz 2013, ss.53-55 identifier

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Basıldığı Şehir: Prague
  • Basıldığı Ülke: Çek Cumhuriyeti
  • Sayfa Sayıları: ss.53-55
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

The temperature dependences of the damping constant and the order parameter are calculated for the lattice mode of E (1TO) in PbTiO3 using the experimental data by the pseudospin- phonon coupled model and the enrgy fluctuation model. Calculation of the damping constant of soft mode is performed in the temperature range of 400- 490 degrees C close to the ferroelectric- paraelectric transition (T-C= 493 degrees C) in PbTiO3. By relating the frequency to the order parameter, the temperature dependence of the Raman frequency for the E (1TO) mode is calculated in the ferroelectric phase of PbTiO3 using the molecular field theory.