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
Kavruk, D.

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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

Collections

Department of Physics, Article