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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Citation Formats

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.