Application of the spectroscopic modifications of Pippard relations to NaNO2 in the ferroelectric phase

Date

2001-01-01

Author

Yurtseven, Hasan Hamit

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

155
views

0
downloads

This study examines a linear variation of the specific heat C-P with the frequency shifts 1/nu(partial derivative nu/partial derivativeT) for the Brillouin frequencies of the L-mode [010], [001] and [100] in the ferroelectric phase of NaNO2 according to our spectroscopically modified Pippard relation. We obtain this linear relationship for those modes studied and calculate dT(C)/dP in the ferroelectric phase of NaNO2. Our calculated values of dT(C)/dP for the [001] and [100] modes are in good agreement with the values given in the literature.

Subject Keywords

Pippard relations, Ferroelectric phase, NaNO2

URI

https://hdl.handle.net/11511/57009

Journal

JOURNAL OF MOLECULAR STRUCTURE

DOI

https://doi.org/10.1016/s0022-2860(00)00756-0

Collections

Department of Physics, Article

Suggestions

OpenMETU
Core

Spectroscopic modifications of the Pippard relations for NaNO2 in the sinusoidal antiferroelectric phase Tari, O; Yurtseven, Hasan Hamit (2002-06-01) We establish in this study a linear variation of the specific heat C-p with the frequency shifts (1/nu)(partial derivativenu/partial derivativeT) in the sinusoidal antiferroelectric phase of NaNO2, according to the first Pippard relation which we have modified spectroscopically. For this linear relationship we use the Brillouin frequencies of acoustic phonon modes for the q[010], q[001] and q[100] modes of NaNO2 in the sinusoidal antiferroelectric phase. We then calculate dT/dP values due to those modes stu...
Brillouin frequency shifts in the ferroelectric phase of NaNO2 Yurtseven, Hasan Hamit (2001-10-01) In this study we calculate the Brillouin frequencies for the L-mode [010], [001] and [100] in the ferroelectric phase of NaNO2 (T-C = 163 C) by means of gamma -Gruneisen relations using the thermal expansivity data from the literature. The predicted frequencies are in good agreement with the observed Brillouin frequencies for the modes studied in the ferroelectric phase of NaNO2. This indicates that our method presented here predicts the observed behavior of NaNO2 in the ferroelectric phase.
Calculation of the Brillouin frequencies close to phase transitions in NaNO2 Yurtseven, Hasan Hamit (2002-01-01) We calculate here the Brillouin frequencies of the L-mode [010], [001] and [100] of NaNO2 for the phase transitions from the paraelectric phase to the sinusoidal anti-ferroelectric phase near the Neel temperature (T-N = 437.7 K) and to the ferroelectric phase near the critical temperature (T-c = 436.3 K) in this crystalline system. For calculating the frequencies, we use the thermal expansivity data for the phase regions considered, under the assumption that the mode Gruneisen parameter determined for each ...
Calculation of the Dielectric Constant of a Ferroelectric Liquid Crystal From a Mean Field Model YURTSEVEN, HASAN HAMİT; Yurtseven, Hasan Hamit (2011-01-01) The static dielectric constant epsilon(perpendicular to) of the ferroelectric liquid crystal 4-(3-methyl-2-chlorobutanoyloxy)-4'--heptyloxybiphenyl (A7) with high spontaneous polarization is calculated as a function of temperature using a mean field model. This calculation is performed close to the smectic A-isotropic liquid (SmA-I) transition for pure optically active compound (T-c = 81.6 degrees C). For this calculation of epsilon(perpendicular to), the free energy of the SmA phase is expanded in terms of...
Critical behaviour of ammonia near the melting point Yurtseven, Hasan Hamit (2002-08-01) This study gives our calculations for thermodynamic quantities, such as the isothermal cornpressibility k(T), thermal expansivity alphap and the specific heat C-P, as a function of temperature for solid ammonia near the melting point. Our calculations, which have been performed on the basis of an experimental study given in the literature, show that those thermodynamic quantities diver e near the melting point in ammonia. This is an indication that ammonia exhibits a critical transition as one approaches th...

Citation Formats

H. H. Yurtseven, “Application of the spectroscopic modifications of Pippard relations to NaNO2 in the ferroelectric phase,” JOURNAL OF MOLECULAR STRUCTURE, pp. 189–196, 2001, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/57009.