Calculation of the thermodynamic functions using a mean field model for the fluid-solid transition in nitrogen


Revue Roumaine de Chimie, vol.65, no.5, pp.425-432, 2020 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 65 Issue: 5
  • Publication Date: 2020
  • Doi Number: 10.33224/rrch.2020.65.5.02
  • Journal Name: Revue Roumaine de Chimie
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core
  • Page Numbers: pp.425-432
  • Keywords: thermodynamic functions, mean field model, fluid-solid transition, N2, NONMOLECULAR PHASE, HIGH-PRESSURES, RAMAN
  • Middle East Technical University Affiliated: Yes


Temperature and pressure dependence of the thermodynamic quantities are calculated using the Landau phenomenological model for the first order fluid-solid transition in nitrogen. This calculation is performed by fitting the phase line equation as derived from the mean field model to the observed T-P phase diagram of the fluid-solid transition in N-2 from the literature. Our calculations show that the order parameter and the inverse susceptibility decrease whereas the entropy, heat capacity, thermal expansion and isothermal compressibility exhibit anomalous behavior as the melting point is approached in nitrogen. This indicates that the first order fluid-solid transition in N-2 can be described by the mean field model studied here.