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Phase transitions in uranium dioxide at high pressures and temperatures

  • Condensed Matter
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Abstract

The melting curve is plotted for uranium dioxide with fluorite structure in a pressure range from −2.5 to +100 GPa. This curve has a peak at the point 3348 K, 6 GPa, and has a negative derivative at high pressures. The pressure corresponding to a polymorphic transition of uranium dioxide (37 GPa) at a temperature of 1015 K is determined. The slope of the equilibrium curve of the polymorphic transition in UO2 in the temperature range 300–1000 K is − 56 K/GPa.

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Authors and Affiliations

  1. Institute of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432, Russia

    A. M. Molodets & V. E. Fortov

Authors
  1. A. M. Molodets
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  2. V. E. Fortov
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Translated from Pis’ma v Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 80, No. 3, 2004, pp. 196–199.

Original Russian Text Copyright © 2004 by Molodets, Fortov.

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Molodets, A.M., Fortov, V.E. Phase transitions in uranium dioxide at high pressures and temperatures. Jetp Lett. 80, 172–175 (2004). https://doi.org/10.1134/1.1808844

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  • DOI: https://doi.org/10.1134/1.1808844

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