Pippard relations modified by the Raman frequency shifts for the phases I and II in NH4I

YURTSEVEN H. H.

JOURNAL OF MOLECULAR STRUCTURE, vol.924, pp.540-543, 2009 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 924
  • Publication Date: 2009
  • Doi Number: 10.1016/j.molstruc.2008.10.070
  • Journal Name: JOURNAL OF MOLECULAR STRUCTURE
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.540-543
  • Middle East Technical University Affiliated: Yes

Abstract

Pippard relations in terms of the frequency shifts of the v(7) (40 cm(-1)) lattice mode, are established here for the phases I and II in NH4I. The temperature-induced frequency shift, (1/v)(partial derivative v/partial derivative T)(P) is calculated through the isobaric mode Gruneisen parameter gamma(P) using the lattice parameter data at zero pressure for the phases I and II in NH4I. From the frequency shifts, the specific heat C-P is calculated for the phases studied at zero pressure. Also, the pressure-induced frequency shift, (1/v)(partial derivative v/partial derivative P)(T) is calculated through the isothermal mode Gruneisen parameter gamma(T) at 300 K and it is related to the thermal expansivity alpha(P) for the phases I and II in NH4I.