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Specific Heat of NH4Cl and NH4BrxCl1-x Crystals Close to the Ferro-Ordered Phase
Date
2009-04-01
Author
Yurtseven, Hasan Hamit
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This study gives calculation of the specific heat C-VI of NH4Cl and NH4BrxCl1-x under the Ising model for the transition between the disordered (D) and ferro-ordered O(F) phases in these crystalline systems. Our C-VI values which we calculated for x = 0 and x = 0.04, agree both below and above T-c with the observed C-p data from the literature. Our value of a congruent to 0.1 (T < T-c and T > T-c) is in good agreement with the predicted value of 1/8 (0.125) of a 3D Ising model.
Subject Keywords
WEAKLY FIRST-ORDER
,
AMMONIUM HALIDES
,
SINGLE-CRYSTALS
,
TRANSITIONS
,
DIAGRAM
,
SYSTEM
,
NH4BR
,
CAPACITY
URI
https://hdl.handle.net/11511/52574
Journal
JOURNAL OF THE CHEMICAL SOCIETY OF PAKISTAN
Collections
Department of Physics, Article
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Yurtseven, Hasan Hamit (AIP Publishing, 2005-11-01)
We calculate the specific heat C-VI of NH4Br and mixed crystals of NH4BrxCl1-x using the Ising model for the transition between the disordered (D) and antiferro- (AF) electric phases in these crystalline systems. Our C-VI values, which we calculated for x(Br)=1, 0.26, and 0.51 are in good agreement, both below and above T-C, with the observed C-P data from the literature. Our value of congruent to 0.1 (T < T-C and T>T-C) for the critical exponent of the specific heat agrees with the value of 0.125 predicted...
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Yurtseven, Hasan Hamit (2008-07-01)
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Temperature dependence of the Raman frequencies and bandwidths close to phase transitions in ammonium halides
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In this study, we give the temperature dependence of our observed frequencies and bandwidths for the Raman optical modes in the ammonium halides close to the phase transitions of the first order (NH4 Br), tricritical (NH4Cl) and second order (NH4Cl). Using the predictions of an [sing pseudospin-phonon coupled model, which considers interactions between two spin and two phonons, our observed Raman data have been interpreted qualitatively. Our results show that an Ising model considered here can explain the o...
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H. H. Yurtseven, “Specific Heat of NH4Cl and NH4BrxCl1-x Crystals Close to the Ferro-Ordered Phase,”
JOURNAL OF THE CHEMICAL SOCIETY OF PAKISTAN
, pp. 207–213, 2009, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/52574.