The thermodynamic quantities necessary for the calculation of the ThS-Ti and Th-U phase diagrams are estimated and the phase diagrams calculated.nIt is of interest to determine if it is possible to calculate the phase diagrams of systems consisting of metals and refractory ceramic materials. In carrying out these calculations, two simplifying assumptions will be made.. It will be assumed that the AC of fusion can be neglected and that the entropy of mixing of liquid ThS and liquid metals is ideal. The first assumption will not introduce any serious error. The error introduced by the second assumption is unknown, as no pertinent data exist for systems of the type being considered here. However, the error introduced should not affect the order of magnitude of the calculations.
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