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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 UO(2) increases with pressure with a slope more than three times larger than expected.

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Authors: MUSELLA M, Institute for Transuranium Elements, Karlsruhe (DE);RONCHI C, Institute for Transuranium Elements, Karlsruhe (DE);SHEINDLIN M, Russian Academy of Sciences, Moscow (RU)
Bibliographic Reference: Article: International Journal of Thermophysics, 1998
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