Enthalpy of formation of N-U (nitrogen-uranium) system

  • F. Predel
Part of the Physical Chemistry book series (volume 12D)


This chapter provides the enthalpy of formation of N-U (nitrogen-uranium) system.


Katsura et al. [98Kat] have investigated thoroughly the formation of α-U2N3+x starting from metallic U with a mixture of N2 and H2. The reaction takes place even at 570 K.

In a thermodynamic study Nakagawa et al. [98Nak] have determined N2 pressure-composition isotherms at temperatures between 670 K and 1170 K for the single phase α-U2N3+x. From results obtained the authors calculated the partial molar free energy, enthalpy and entropy as a function of N2 content.

The enthalpy of formation of UN has been estimated by Suzuki et al. [98Suz] on the basis of mass spectrometric experiments to be about ΔHS = −296 kJ mol−1 (see also [75Ack]).

Symbols and abbreviations

Short form

Full form


integral enthalpy of formation of a solid alloy


  1. [75Ack]
    Ackermann, R.J., Rauh, E.G.: J. Chem. Thermodyn. 7 (1975) 211CrossRefGoogle Scholar
  2. [98Kat]
    Katsura, M., Nishimaki, K., Nakagawa, T., Takahashi, K.: J. Alloys Comp. 271273 (1998) 662CrossRefGoogle Scholar
  3. [98Nak]
    Nakagawa, T., Nishimaki, K., Urabe, T., Katsura, M.: J. Alloys Comp. 271273 (1998) 658CrossRefGoogle Scholar
  4. [98Suz]
    Suzuki, Y., Arai, Y.: J. Alloys Comp. 271273 (1998) 577CrossRefGoogle Scholar

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© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • F. Predel
    • 1
  1. 1.Max-Planck-Institut für FestkörperforschungStuttgartGermany

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