Thermodynamics of the uranium-platinum metals systems
A critical assessment is given of the thermodynamics of the uranium-platinum metals systems. It also includes the Gibbs energies of formation of URu3, U3Ru5, URu3C0.7, U2RuC2, URh3, UOs2, UIr3 and UIr2 which were determined in this laboratory using solid galvanic cells with CaF2 single crystal electrolyte between 900 and 1200 K. For this purpose, the isothermal sections of the ternary U-Ru-F, U-Rh-F, U-0s-F and U-Ir-F systems were investigated in preceding experiments. The experimental thermodynamic results of the intermetallic phases and the platinum metal rich solid solution regions are discussed in the light of the semi- empirical cohesion energy model developed by Miedema.