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Calculation of the Raman frequencies using volume data close to the tricritical and second order phase transitions in NH4Cl
Date
2009-04-30
Author
Yurtseven, Hasan Hamit
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We calculate here the Raman frequencies of the v(5) TO(174 cm(-1)) and v(2) (1708 cm(-1)) modes as a function of temperature in the region of the tricritical (P = 1.6 kbar) and the second order (P = 2.8 kbar) phase transitions in NH4Cl. This calculation of the Raman frequencies is performed through the mode Gruneisen parameter by using the experimental length-change data obtained at zero pressure where the NH4Cl crystal exhibits a weakly first order phase transition (T-lambda = 242 K). The predicted Raman frequencies of the modes studied here, agree with our observed frequencies for the tricritical (T-c = 257 K) and second order (T-c = 268 K) transitions in NH4Cl.
Subject Keywords
Inorganic Chemistry
,
Organic Chemistry
,
Analytical Chemistry
,
Spectroscopy
URI
https://hdl.handle.net/11511/47872
Journal
JOURNAL OF MOLECULAR STRUCTURE
DOI
https://doi.org/10.1016/j.molstruc.2008.10.069
Collections
Department of Physics, Article
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H. H. Yurtseven, “Calculation of the Raman frequencies using volume data close to the tricritical and second order phase transitions in NH4Cl,”
JOURNAL OF MOLECULAR STRUCTURE
, pp. 544–547, 2009, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/47872.