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Temperature dependence of the mode Gruneisen parameter in the vicinity of the lambda-transition point in NH4Cl
Date
2006-11-01
Author
Karacali, H.
Yurtseven, Hasan Hamit
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This study gives our relations between the specific heat C P and the Raman frequency shifts (1/v)(partial derivative v/partial derivative T)(p) for the lattice modes of v(5) (144 cm(-1)) and v(5) (174 cm(-1)), when the mode Gruneisen parameter gamma(p) depends on the temperature near. the lambda-transition in NH4Cl (T-lambda = 242.5 K, P = 0).
Subject Keywords
Mode Gruneisen parameter
,
Lambda-transition point
,
Ammonium chloride
URI
https://hdl.handle.net/11511/54423
Journal
JOURNAL OF THE INDIAN CHEMICAL SOCIETY
Collections
Department of Physics, Article
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This study gives our calculation for the damping constant, using the expressions derived for an Ising pseudospin-phonon coupled system in the ammonium halides (NH4Cl and NH4Br). For this calculation of the damping constant, we use the temperature dependence of the order parameter calculated from the molecular field theory. We predict here the damping constants for the v(5) (174 cm(-1)) and v(5) (177 cm(-1)) Raman modes of NH4Cl and NH4Br, respectively, below T-lambda and compare them with our observed bandw...
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We reexamine the Pippard relations in this study by relating the specific heat C-P to the Raman frequency shifts 1/v(partial derivative v/partial derivative T)(P) and the thermal expansivity alpha(p) to the 1/v(partial derivative v/partial derivative P)(T), when the mode Gruneisen parameter depends on the temperature and pressure close to the melting point in hexagonal ice. From linear relations between them, the values of the slope dP/dT are deduced in this crystal.
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We calculate the pressure dependence of the Raman frequencies of some Raman modes by using the observed volume data through the mode Gruneisen parameters for the ferroelectri-paraelectric transition in PbTiO3. The mode Gruneisen parameters which we have determined using the observed Raman frequencies for the soft modes, increase considerably with increasing pressure toward the transition pressure (PC similar to 11 GPa) from the tetragonal (ferroelectric) to the cubic (paraelectric) phase in PbTiO3. Variatio...
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H. Karacali and H. H. Yurtseven, “Temperature dependence of the mode Gruneisen parameter in the vicinity of the lambda-transition point in NH4Cl,”
JOURNAL OF THE INDIAN CHEMICAL SOCIETY
, pp. 1097–1102, 2006, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/54423.