Damping constant, dielectric susceptibility, inverse relaxation time and the activation energy calculated as a function of temperature from the Raman frequency for the rhombohedral-tetragonal phase transition in BaCeO3

Date

2017-12-01

Author

KİRACI, ALİ
Yurtseven, Hasan Hamit

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URI

https://hdl.handle.net/11511/69423

Journal

Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi

DOI

https://doi.org/10.25092/baunfbed.363769

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Department of Physics, Article

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Damping constant and the inverse relaxation time calculated as a function of pressure using the x-ray diffraction data close to the cubic-tetragonal phase transition in SrTiO3 Yurtseven, Hasan Hamit (2017-05-31)
Damping constant and the inverse relaxation time calculated as a function of pressure using the X-ray diffraction data close to the cubic-tetragonal phase transition in SrTiO3 Yurtseven, Hasan Hamit (Informa UK Limited, 2019-10-01) The damping constant is calculated as a function of pressure at room temperature using the normalized intensity as an order parameter near the cubic-tetragonal phase transition in SrTiO3. The observed X-ray diffraction data are used for the normalized intensities to calculate the damping constant () from the pseudospin-phonon (PS) coupled model and the energy fluctuation (EF) model, which is fitted to the observed FWHM data from the literature for comparison. Using the calculated values, the pressure depend...
Damping constant and the relaxation time calculated for the lowest-frequency soft mode in the ferroelectric phase of Cd2Nb2O7 Kiraci, A.; Yurtseven, Hasan Hamit (2016-01-01) The temperature dependence of the phonon frequency omega(ph) and of the damping constant Gamma(sp) due to pseudospin-phonon coupling of the lowest-frequency soft mode is calculated in the ferroelectric phase near the transition temperature (T-C =196 K) in Cd2Nb2O7. Raman frequency of the soft mode is used as an order parameter which is calculated from the molecular field theory. On that basis, the damping constant is calculated by fitting the expressions from the pseudospin-phonon coupled model and the ener...
Damping Constant (Linewidth) and the Relaxation Time of the Brillouin LA Mode for the Ferroelectric-Paraelectric Transition in PbZr1-xTixO3 Yurtseven, Hasan Hamit (2016-10-01) The damping constant (linewidth) of the longitudinal acoustic (LA) mode is calculated as a function of temperature using the observed Brillouin frequencies of this mode from the literature for the ferroelectric-paraelectric transition (T-C = 657 K) in PbZr1-xTixO3 (x = 0.45). For this calculation of the damping constant, the pseudospin-phonon coupled model and the energy fluctuation model are used by fitting to the observed data for the Brillouin frequencies of the LA mode in the ferroelectric (T < T-C) and...

Citation Formats

A. KİRACI and H. H. Yurtseven, “Damping constant, dielectric susceptibility, inverse relaxation time and the activation energy calculated as a function of temperature from the Raman frequency for the rhombohedral-tetragonal phase transition in BaCeO3,” Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi, pp. 77–83, 2017, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/69423.