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The enthalpies of formation ΔHM of the liquid binary (Ag + Au, Ag + Sn and Au + Sn) and ternary alloys (Ag + Au + Sn) were measured at 1373 K by direct calorimetry on the whole concentration range. The ternary investigations were conducted along the sections XAg/XAu = 1/4, 1/1, 6.25/3.75 and 7/3 with XSn < 0.60 and XAg/XSn = 3/7, 1/1 and 7/3 with XAu < 0.60. The apparatus used was a very high temperature calorimeter with a sensing device consisting in 20 Pt + 6% Rh/Pt + 30% Rh thermocouples. The experimental uncertainty was quoted at 10%. The results obtained for the limiting binary systems were compared with those, numerous and contradictory, reported in literature. The enthalpies of formation of the ternary alloys Ag + Au + Sn can be represented using a modified Kohler's equation including a supplementary correction term to the binary contributions.

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Bildungsenthalpie / Fliissige Legierungen / Hochtemperatur-Kalorimetrie / Metalle / ThermodytiamikThe enthalpies of formation of Al -Si and Al-Ge -Si liquid alloys were investigated by high temperature calorimetry. A new mixing and stirring device was designed in order to take into account the physicochemical properties of the metals involved. -The enthalpy of formation of the ternary alloys were found satisfactory using the Kohler's equation; the quasi-ideality assumption for the binary Ge-Si revealed verified within the experimental accuracy.