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Calculation of the specific heat from the Raman frequency shifts close to the tricritical and second order phase transitions in NH4Cl
Date
2007-05-01
Author
Kaya, D.
Yurtseven, Hasan Hamit
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This study gives our calculation for the specific heat using our Raman frequency shifts of the v(5) (174 cm(-1)) mode close to the tricritical (P = 1.6 kbar) and second order (P = 2.8 kbar) phase transitions in NH4Cl. For this calculation we use as the values of the critical exponent for the specific heat, a = 0.11 (T < T-c and T > T-c) for the tricritical (T-c = 257.17 K), and a = 0.18 (T < T-c), a = 0.64 (T > T-c) for the second order (T-c = 268 K) phase transitions, which we deduce from our analysis of the Raman frequency shifts of this mode studied here, on the basis of an Ising model.
Subject Keywords
General Materials Science
,
General Chemistry
,
Condensed Matter Physics
URI
https://hdl.handle.net/11511/35929
Journal
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
DOI
https://doi.org/10.1016/j.jpcs.2007.01.034
Collections
Department of Physics, Article
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D. Kaya and H. H. Yurtseven, “Calculation of the specific heat from the Raman frequency shifts close to the tricritical and second order phase transitions in NH4Cl,”
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
, pp. 861–865, 2007, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/35929.