Correlations of the thermodynamic quantities with the frequency shifts of a lattice mode close to the I-II transition in NH4Br
RADIATION PHYSICS AND CHEMISTRY, vol.79, no.6, pp.692-695, 2010 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 79 Issue: 6
- Publication Date: 2010
- Doi Number: 10.1016/j.radphyschem.2010.01.004
- Journal Name: RADIATION PHYSICS AND CHEMISTRY
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Page Numbers: pp.692-695
- Middle East Technical University Affiliated: Yes
Abstract
We correlate here the specific heat C-p with the frequency shifts (1/V) (partial derivative V/partial derivative T) and the thermal expansivity alpha(p) with the (1/v) (partial derivative V/partial derivative P)(T) close to the I-II transition in NH4Br. This correlation is performed for the Raman mode of vs (140 cm(-1)) using the molar volume data for NH4Br. It is shown here that spectroscopic modifications of the Pippard relations are applied satisfactorily to the I-II phase transition by using a lattice mode of NH4Br. (C) 2010 Elsevier Ltd. All rights reserved.