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Twenty three alloys AI+ Ga + Sb have been studied by the Emf method between 623 and 1300 K using concentration cells of the type: AI/(AI 3 + in LiCI + KCI (liq.))/(Al+Ga+Sb).Partial molar functions of aluminium and some equilibrium temperatures were determined; they are in satisfactory agreement with the calculation of Kaufman et al. -The comparison of the experimental ternary dmixGAI values and the corresponding ones calculated using several empirical equations shows that the best agreement is obtained by Colinet's equation.

An electrode potential study of the liquid Ga-Ge-Zn system has been conducted with the cell ZnlZn 2+ in LiC1 -~ KCltZn-Ga-Ge in the temperature range 623~176 Zinc partial mixing functions were determined for 22 alloys. These measurements allow us to give the surface corresponding to zinc partial free energy at 1233~ and a large part of the liquidus surface of this system.In the course of the thermodynamic study carried out by our laboratory at the Universit~ de Provence concerning ternary systems formed by adding to gallium-germanium alloys another metal of group II or Ill Al (I), In (2), Sn (2), we have measured, by potentiometry, the zinc activity in a number of gallium-germanium-zinc liquid alloys over a large temperature range. The thermodynamic functions and the phase diagram of this ternary system have not been previously studied.The three limiting binary systems: Ga-Ge, Ga-Zn, and Ge-Zn, the phase diagrams of which are shown in Fig. I, have the same characteristics: each eutectic composition is very near the most fusible element and terminal solid solutions are small.

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