Calculation of the Raman frequencies of lattice modes in the disordered phase II of NH4Br at high pressures

Date

2010-01-01

Author

Yurtseven, Hasan Hamit

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The Raman frequencies are calculated here at various temperatures for the nu(7) (56 cm(-1)) and nu(5) (134 cm(-1)) lattice modes in the disordered phase II of NH4Br. The lattice parameter data obtained at zero pressure are used to calculate the Raman frequencies of those modes studied for constant pressures of 0.1, 108, and 637.5 MPa in phase II of the NH4Br crystal. Through the mode Gruumlneisen parameter which is kept constant in the disordered phase II, the Raman frequencies calculated decrease linearly with increasing temperature at all fixed pressures for both lattice modes of NH4Br. Measurements of the Raman frequencies for the lattice modes of interest can be conducted to examine our calculations under the temperature and pressure variations given here for NH4Br. (C) 2010 Physics Essays Publication. [DOI: 10.4006/1.3504860]

Subject Keywords

General Physics and Astronomy

URI

https://hdl.handle.net/11511/40076

Journal

PHYSICS ESSAYS

DOI

https://doi.org/10.4006/1.3504860

Collections

Department of Physics, Article

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Citation Formats

H. H. Yurtseven, “Calculation of the Raman frequencies of lattice modes in the disordered phase II of NH4Br at high pressures,” PHYSICS ESSAYS, pp. 608–612, 2010, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/40076.