Calculation of the DampingConstant, Relaxation Timeand the Activation Energy ofRaman Modes inStoichiometric LiTaO3

Date

2017-04-29

Author

Kiracı, Ali
Yurtseven, Hasan Hamit

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URI

http://mme2017.cankaya.edu.tr/abstract-book/
https://hdl.handle.net/11511/73743

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Calculation of the raman frequency, damping constant (Linewidth) and the relaxation time near the tetragonal-cubic transition in PbTiO3 KİRACI, ALİ; Yurtseven, Hasan Hamit (2017-01-01) Frequencies, damping constants and the relaxation times of some Raman modes including the two soft modes are calculated as a function of pressure near the tetragonal-cubic transition in PbTiO3. Calculation of the Raman frequencies is performed using the observed volume data from the literature by means of the mode Gruneisen parameter at various pressures. Pressure dependence of the damping constant and the relaxation time is predicted using the pseudospin-phonon coupled model and the energy fluctuation mode...
Calculation of the damping constant and the order parameter for the lattice mode in ferroelectric PbTiO3 Kiraci, A.; Yurtseven, Hasan Hamit (2013-07-25) 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 R...
Calculation of the Specific Heat Close to Phase Transition in S-triazine KURT, MUSTAFA; Yurtseven, Hasan Hamit (Walter de Gruyter GmbH, 2009-01-01) The specific heat C-V as a function of temperature has been calculated using the quasi-harmonic and mean field approximation for s-triazine close to the transition temperature (T-C=198 K). Using the parameters for the shear strain angle (order parameter) fitted to the observed Raman frequencies of the four bands, the specific heat C-V is calculated from the free energy of s-triazine.
Calculation of the Raman frequency and the damping constant (linewidth) of the stretching modes for the metal-organic compound DMMg close to the paraelectric-ferroelectric transitions Yurtseven, Hasan Hamit (2018-01-01) We calculate the Raman frequencies of the two stretching modes of as a function of temperature close to the paraelectric-ferroelectric transition (Tc = 270K) in (CH3)(2)NH2Mg(HCOO)(3) referred as DMMg. By assuming that the Raman frequencies of those two modes which exhibit anomalous behaviour near Tc due to the ordering of the dimethlyammonium cations (DMA(+)) as observed experimentally, are associated with the spontaneous polarization (order parameter), their Raman frequencies and damping constants are pre...
Calculation of the Relaxation Time and the Activation Energy Close to the Lower Phase Transition in Imidazolium Perchlorate Yurtseven, Hasan Hamit (2021-08-01) The temperature dependence of the relaxation time of imidazolium perchlorate (Im-ClO4) was calculated from the pseudospin-phonon coupled (PS) and the energy fluctuation (EF) models close to the first-order phase transition temperature of 247 K. This calculation was performed in terms of the proton second moment M2 that was associated with the order parameter which was predicted from the mean-field theory. Our results were in good agreement with the observed data. In addition, values of the activation energy...

Citation Formats

A. Kiracı and H. H. Yurtseven, “Calculation of the DampingConstant, Relaxation Timeand the Activation Energy ofRaman Modes inStoichiometric LiTaO3,” 2017, Accessed: 00, 2021. [Online]. Available: http://mme2017.cankaya.edu.tr/abstract-book/.