Dependence of the Melting Temperature on Pressure up to 2000 Bar in Uranium Dioxide, Tungsten and Graphite.
The melting point of uranium dioxide, tungsten and graphite was measured as a function of the isostatic pressure up to 2000 bar, in a laser-heated autoclave filled with inert gas. The measured melting curves and their slopes were compared with the predictions obtained from the Clausius-Clapeyron equation and the existing thermochemical data of these substances. Whilst for tungsten and graphite the results show a reasonable agreement with the equilibrium thermodynamic calculation, the melting point of UO2 increases with the equilibrium thermodynamic calculation, the melting point of UO2 increases with pressure with a slope more than three times larger than expected.
MUSELLA Manuela;
RONCHI Claudio;
SHEINDLIN M.;
1998-11-18
JRC17246
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