Title :
Calculation of the damping constant and the order parameter for the lattice mode in ferroelectric PbTiO3
Author :
Kiraci, A. ; Yurtseven, H.
Author_Institution :
Dept. of Phys., Middle East Tech. Univ., Ankara, Turkey
Abstract :
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 energy fluctuation model. Calculation of the damping constant of soft mode is performed in the temperature range of 400-490 °C close to the ferroelectric-paraelectric transition (TC=493 °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. Our calculated values for the damping constant and the order parameter describe the observed behaviour of PbTiO3 close to the ferroelectric-paraelectric transition (TC=493 °C) adequately.
Keywords :
Raman spectra; damping; ferroelectric transitions; lead compounds; phonons; E (1TO) mode; PbTiO3; Raman frequency; damping constant; enrgy fluctuation model; ferroelectric phase; ferroelectric-paraelectric transition; lattice mode; molecular field theory; pseudospin-phonon coupled model; soft mode; Crystals; Damping; Data models; Fluctuations; Predictive models; Temperature dependence; Temperature distribution; PbTiO3; damping constant; order parameter;
Conference_Titel :
Applications of Ferroelectric and Workshop on the Piezoresponse Force Microscopy (ISAF/PFM), 2013 IEEE International Symposium on the
Conference_Location :
Prague
DOI :
10.1109/ISAF.2013.6748738
