Abstract
By thermal analysis and X-ray and dilatometric measurements the equilibrium conditions in the complete concentration range of the system Ga-Sn were precisely determined. The eutectic point lies at 8.5 at.% Sn at 20.6°C. The maximum solubility of Ga in solid Sn is 7.1 at.% Ga at 20°C. An intermetallic phase does not appear in this system. The densities of the tin solid solution was determined at 20°C by X-ray measurements and also macroscopically. Measurements of thermal expansion provided values for the densities at higher temperatures. The hardness of the tin solid solution increases noticably with increasing Ga content. A calculation of the free enthalpy of mixing and the entropy of mixing of liquid Ga-Sn-alloys from the melt equilibria showed that this system has only a small tendency to separate, which tendency is expressed, among other evidence, in the slight positive deviation of the activity isotherms from the slope of Raoult's law.
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