Analysis of the Integrated Intensity of the Central Peaks Calculated as a Function of Temperature in the Ferroelectric Phase of Lithium Tantalate.

Date

2017-04-29

Author

Kiracı, Ali
Yurtseven, Hasan Hamit

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The integrated intensity of the central peak is calculated as a function of temperature in the ferroelectric phase (T<TC) of nearly stoichiometric LiTaO3. This calculation is performed using the temperature dependence of the order parameter obtained from the mean field theory (MFT) at temperatures lower than the transition temperature TC (TC= 963 K) of this crystal. The calculated values of the order parameter (squared) are fitted to the integrated intensity of 92 the central peaks as observed from the Raman and Brillouin scattering experiments reported in the literature at the ferroelectric phase of nearly stoichiometric LiTaO3. Our results are in good agreement with the observed behavior of LiTaO3 crystal.

URI

http://mme2017.cankaya.edu.tr/abstract-book/
https://hdl.handle.net/11511/86719

Conference Name

International workshop on mathematical methods in engineering ( 27 - 29 Nisan 2017)

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Department of Physics, Conference / Seminar

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ANALYSIS OF THE INTEGRATED INTENSITY OF THE CENTRAL PEAKS CALCULATED AS A FUNCTION OF TEMPERATURE IN THE FERROELECTRIC PHASE OF LITHIUM TANTALATE Kiraci, Ali; Yurtseven, Hasan Hamit (National Library of Serbia, 2018-01-01) The integrated intensity of the central peak is calculated as a function of temperature in the ferroelectric phase (T < T-C) of nearly stoichiometric LiTaO3. This calculation is performed using the temperature dependence of the order parameter obtained from the mean field theory at temperatures lower than the transition temperature T-C (T-C = 963 K) of this crystal. The calculated values of the order parameter (squared) are fitted to the integrated intensity of the central peaks as observed from the Raman a...
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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 heat capacity Cp from the temperature-induced and pressure-induced Raman frequency shifts for solid benzene, naphthalene and anthracene Ozdemir, Hilal; Yurtseven, Hasan Hamit (Elsevier BV, 2019-02-01) The heat capacity Cp is calculated from the temperature-induced and pressure-induced Raman frequency shifts by means of the mode Griineisen parameter for the I-II transition of solid benzene, naphthalene and anthracene. For this calculation, contributions to Cp are considered due to the six lattice modes of solid benzene, six librational modes of naphthalene and, six phonons and nine vibrons of anthracene with their mode Griineisen parameters at various temperature (P = 0) and pressures (T=300 K). Our calcu...

Citation Formats

A. Kiracı and H. H. Yurtseven, “Analysis of the Integrated Intensity of the Central Peaks Calculated as a Function of Temperature in the Ferroelectric Phase of Lithium Tantalate.,” presented at the International workshop on mathematical methods in engineering ( 27 - 29 Nisan 2017), Çankaya University, Ankara, Turkey, 2017, Accessed: 00, 2021. [Online]. Available: http://mme2017.cankaya.edu.tr/abstract-book/.