Gibbs energies of formation of the intermetallic compounds of U–Sn system

Critical evaluation and thermodynamic optimization of the (U + Bi), (U + Si) and (U + Sn) binary systems

“…Colient et al [52] measured the enthalpy of formation of USn 3 by solution calorimetry, and a value of À35.3 kJ Á mol-atom À1 at 25°C was reported. Pattanaik et al [53] studied the Gibbs energies of formation of USn 3 , U 3 Sn 7 , USn 2 and USn using emf measurements with high temperature molten salt galvanic cells. The enthalpies and entropies of formation of those compounds were derived from their emf measurements [53].…”

“…Pattanaik et al [53] studied the Gibbs energies of formation of USn 3 , U 3 Sn 7 , USn 2 and USn using emf measurements with high temperature molten salt galvanic cells. The enthalpies and entropies of formation of those compounds were derived from their emf measurements [53]. There are no experimental data reported on the thermodynamic properties of the liquid phase.…”

“…The calculated standard enthalpies of formation of compounds (with reference to orthorhombic _U and bct_Sn) and 521°C (with reference to orthorhombic _U and liquid_Sn) are shown in figure 10 compared to experimental data [41,[50][51][52][53]. It is same as discussed in (U + Si) binary system, due to the experimental data lacking of enthalpy of mixing of liquid (U + Sn) phase, the coordination number of liquid (U + Sn) was estimated based on the experimental values for solids as shown in table 3.…”

“…It is same as discussed in (U + Si) binary system, due to the experimental data lacking of enthalpy of mixing of liquid (U + Sn) phase, the coordination number of liquid (U + Sn) was estimated based on the experimental values for solids as shown in table 3. It is because that the composition with most negative enthalpy of formation of solids is located in the range (40 to 50) at.% Sn in the (U + Sn) Vaugoyeau et al [34] Katz and Rabinowitch [35] Shunk et al [36] Berche et al [14] Dwight [37] Thermal analysis Johnson and Feder [50] Johnson and Feder [50] Alcock and Grieveson [41] Kadochnikov et al [51] Kadochnikov et al [51] Colinet et al [52] Pattanaik et al [53] Colinet et al [52] binary system as shown in figure 10. Calculated entropies of formation of compounds at 521°C (with reference to orthorhombic _U and liquid_Sn) are shown in figure 11, with experimental data from Pattanaik et al [53].…”

“…Pattanaik et al [53] Entropy of formation, ∆S f / J·K -1 ·mol-atom -1 FIGURE 11. Calculated entropies of formation of (U + Sn) binary compounds at 521 with the experimental values [53].…”