Phase transitions in uranium dioxide at high pressures and temperatures |
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Authors: | A. M. Molodets V. E. Fortov |
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Affiliation: | (1) Institute of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432, Russia |
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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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