Abstract
The solubilities of tantalum in liquid gadolinium, terbium, dysprosium, holmium, erbium and thulium have been determined from the melting point of the rare-earth metal to ~ 1800°C, to ~ 1900°C for scandium, and to ~ 2000°C for lutetium. The change of the transition and melting points by tantalum has been measured, and the partial molal heats of solution of tantalum in the rare-earth metals calculated from these data. The liquid solubility of tantalum was found to depend upon the atomic size difference between the rare-earth solvent and the tantalum solute, i.e. the smaller the size difference the greater the solubility at a given common temperature ( e.g. 1700°C). These results also suggest that the atomic size factor curves presented by Strauss, White and Brown for liquid alloys should be modified.
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