Calculation of the soft mode frequency for the alpha beta transition in quartz

Date

2015-09-18

Author

Yurtseven, Hasan Hamit

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The Raman frequencies of the lattice modes (147 cm-1 and 207 cm-1 are analyzed for the α-β transition in quartz according to a power-law formula with the critical exponent by using the experimental data. The temperature dependence of the Raman frequency is associated with the order parameter (polarization P) for this transition in the quartz crystal. The damping constant of the lattice modes studied here is calculated using the Raman frequencies at various temperatures for the α-β transition in quartz (Tc = 846K) using the soft mode - hard mode and the energy fluctuation models. Our calculations for the damping constant (bandwidths) give an evidence that the lattice mode of the 147 cm -1 exhibits a soft mode behavior for the α-β transition in quartz. Copyright © 2012 De Gruyter.

Subject Keywords

α-β transition, Lattice modes, Quartz, Raman linewidths

URI

https://hdl.handle.net/11511/78874
https://www.scopus.com/record/display.uri?eid=2-s2.0-84873832298&origin=resultslist&sort=plf-f&src=s&st1=&st2=&sid=05db9d3e195ac7104d4372df02a4756f&sot=b&sdt=b&sl=94&s=TITLE-ABS-KEY+%28Calculation+of+the+soft+mode+frequency+for+the+alpha+beta+transition+in+quartz%29&relpos=1&citeCnt=8&searchTerm=

Conference Name

International Turkish Congress on Molecular Spectroscopy (TURCMOS 2015)(13 - 18 Eylül 2015)

Collections

Department of Physics, Conference / Seminar

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Calculation of the Raman Linewidths of Lattice Modes Close to the alpha-beta Transition in Quartz Lider, Mustafa Cem; Yurtseven, Hasan Hamit (Walter de Gruyter GmbH, 2012-12-01) The Raman frequencies of the lattice modes (147 cm(-1) and 207 cm(-1)) are analyzed for the alpha-beta transition in quartz according to a power-law formula with the critical exponent by using the experimental data. The temperature dependence of the Raman frequency is associated with the order parameter (polarization P) for this transition in the quartz crystal.
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Calculation of the Raman and IR frequencies from the volume data at high pressures in N-2 AKAY, ÖZGE; Yurtseven, Hasan Hamit (2018-01-01) Raman and IR frequencies of N-2 in the molecular state are calculated as a function of pressure up to 160 GPa by using the volume data from the literature through the mode Gruneisen parameter. By determining the Gruneisen parameters for the lattice modes and vibrons which decrease mostly with increasing pressure from the observed frequency (Raman, IR) and volume data, the Raman and IR frequencies of those modes are calculated at various pressure at room and low temperatures. We find that the Raman and IR fr...
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Citation Formats

H. H. Yurtseven, “Calculation of the soft mode frequency for the alpha beta transition in quartz,” presented at the International Turkish Congress on Molecular Spectroscopy (TURCMOS 2015)(13 - 18 Eylül 2015), 2015, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/78874.