Étude potentiométrique des alliages liquides aluminium-étain et aluminium-tellure

Abstract

The electromotive forces of galvanic cells of the type: Al(pure)/Al 3+ (in LiCl-KCl rmeutectic)/X-Al alloy ( x al , T) where X ≡ Sn or Te, were measured as a function of temperature and the mole fraction of aluminium. The values of the thermodynamic functions of formation of Sn-Al (0.10 < x Al < 0.95; 630 K < T < 1250 K) and Te-Al (0 < x A1 < 0.20; 700 K < T < 820 K) were deduced. For the Sn-Al binary, the results are in agreement with those of Massart. In the case of the Te-Al system, the data which concern the enthalpy of formation of the tellurium-rich side agree with those already obtained in the laboratory by high-temperature calorimetry and differential calorimetric analysis in other ranges of concentration. They corroborate the statement of a high level of heteroassociation in Al-Te liquid alloys.