Calculation of the specific heat from the Raman frequency shifts close to the tricritical and second order phase transitions in NH4Cl

Kaya D., Yurtseven H.

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, vol.68, pp.861-865, 2007 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 68
  • Publication Date: 2007
  • Doi Number: 10.1016/j.jpcs.2007.01.034
  • Journal Name: JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.861-865
  • Keywords: specific heat, AMMONIUM HALIDES, SINGLE-CRYSTALS, ORDER, DIAGRAM
  • Middle East Technical University Affiliated: Yes

Abstract

This study gives our calculation for the specific heat using our Raman frequency shifts of the v(5) (174 cm(-1)) mode close to the tricritical (P = 1.6 kbar) and second order (P = 2.8 kbar) phase transitions in NH4Cl. For this calculation we use as the values of the critical exponent for the specific heat, a = 0.11 (T < T-c and T > T-c) for the tricritical (T-c = 257.17 K), and a = 0.18 (T < T-c), a = 0.64 (T > T-c) for the second order (T-c = 268 K) phase transitions, which we deduce from our analysis of the Raman frequency shifts of this mode studied here, on the basis of an Ising model.