TP Phase Diagram of Nitrogen at High Pressures

  • G. Algul
  • Y. Enginer
  • H. Yurtseven


By employing a mean field model, calculation of the TP 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 N2, and the fitted parameters are determined. Our model study gives that the observed TP 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.


First-order transition Mean field model Nitrogen TP phase diagram 



The authors are grateful to Simge Ates of the Middle East Technical University for the technical assistance of the phase diagram.


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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of PhysicsGebze Technical UniversityGebzeTurkey
  2. 2.Department of MathematicsGebze Technical UniversityGebzeTurkey
  3. 3.Department of PhysicsMiddle East Technical UniversityAnkaraTurkey

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