T-P Phase Diagram of Nitrogen at High Pressures

Algul G., Enginer Y., YURTSEVEN H. H.

INTERNATIONAL JOURNAL OF THERMOPHYSICS, cilt.39, sa.5, 2018 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 39 Sayı: 5
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1007/s10765-018-2376-1
  • Dergi Adı: INTERNATIONAL JOURNAL OF THERMOPHYSICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Anahtar Kelimeler: First-order transition, Mean field model, Nitrogen, T-P phase diagram, SOLID NITROGEN, RAMAN-SPECTROSCOPY, ORIENTATIONAL BEHAVIOR, 2ND-ORDER TRANSITION, DELTA-PHASE, GPA, TEMPERATURES, SCATTERING, SPECTRUM, KBAR
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

By employing a mean field model, calculation of the T-P phase diagram of molecular nitrogen is performed at high pressures up to 200 GPa. Experimental data from the literature are used to fit a quadratic function in T and P, describing the phase line equations which have been derived using the mean field model studied here for N-2, and the fitted parameters are determined. Our model study gives that the observed T-P phase diagram can be described satisfactorily for the first-order transitions between the phases at low as well as high pressures in nitrogen. Some thermodynamic quantities can also be predicted as functions of temperature and pressure from the mean field model studied here and they can be compared with the experimental data.