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Thermodynamic and phase behaviour in the U-Rh-C system
Authors:M.G. Naraine  H.B. Bell
Affiliation:Department of Metallurgy, University of Strathctyde, Glasgow, UK
Abstract:A galvanic cell using a single crystal of CaF2 as electrolyte has been used to measure the free energy of formation of the compounds occurring in the U-Rh-C system. Arc-melted samples were subjected to varying annealing conditions, then metallographic and electron probe micro-analysis were used for phase identification. In binary U-Rh system five compounds were found, URh3, U3Rh5, U3Rh4, URh and U2Rh. The free energy of formation values obtained for these compounds were:ΔGf0 (URh3) = ?282.44 + 0.108TkJ/mol, ΔGf0(U3Rh5) = ?623.02 + 0.252TkJ/mol, ΔGf0 (U3Rh4) = ?547.69 + 0.226T kJ/mol, ΔGf0(URh) = ?152.81 + 0.0672T kJ/mol, ΔGf0(U2RhC2) = ?303.38 + 0.0329T kJ/mol, all for the range 1000–1200 K and ΔGf0(U2Rh) = 182.08 + 0.085T kJ/mol for 893–978 K. However, for U2Rh the upper temperature range is not necessarily the transformation temperature of this compound.
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