Temperature Dependence of the Raman Frequency, Damping Constant and the Activation Energy of a Soft-Optic Mode in Ferroelectric Barium Titanate

@article{Kiraci2012TemperatureDO,
  title={Temperature Dependence of the Raman Frequency, Damping Constant and the Activation Energy of a Soft-Optic Mode in Ferroelectric Barium Titanate},
  author={Ali Kiraci and Hamit Yurtseven},
  journal={Ferroelectrics},
  year={2012},
  volume={432},
  pages={14 - 21}
}
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 (TC =222 K). Using the Raman frequencies calculated, the damping constant is evaluated and it is compared with the observed one for this soft-optic mode. Using the temperature dependence of the damping constant which is calculated from the pseudospin-phonon coupled model and from the energy fluctuation model, activation energies… 

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