Correlations of the thermodynamic quantities with the frequency shifts of a lattice mode close to the I-II transition in NH4Br


YURTSEVEN H. H. , ÖZDEMİR M.

RADIATION PHYSICS AND CHEMISTRY, vol.79, no.6, pp.692-695, 2010 (SCI-Expanded) identifier identifier

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.