Temperature dependence of the Raman bandwidths for the lattice and internal modes in ammonium halides close to the lambda-phase transitions

Date

2008-07-01

Author

Yurtseven, Hasan Hamit
Tuzer, T. U.

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We study here the temperature dependence of our Raman bandwidths for the upsilon(5) lattice modes of NH4Cl (T-lambda = 241 K) and NH4Br (T-lambda = 235 K) and for the upsilon(2) internal mode of NH4Cl close to the lambda-phase transitions.

Subject Keywords

Raman bandwidths, Ammonium halides, Lambda transition, ORDER-DISORDER TRANSITION, WEAKLY FIRST-ORDER, SINGLE-CRYSTALS, HEAT-CAPACITY, T-LAMBDA, NH4BR, NH4CL, PRESSURE, BROMIDE, FREQUENCY

URI

https://hdl.handle.net/11511/33363

Journal

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY

DOI

https://doi.org/10.1016/.j.saa.2007.11.030

Collections

Department of Physics, Article