AN EMF STUDY OF THE TERNARY (PB, SN, SB) LIQUID-PHASE

The Gibbs excess function of the (Pb, Sn, Sb) liquid phase at 900 K is given in a Redlich-Kister formalism. The literature was used for the two binary (Pb, Sn) and (Sb,Pb) border systems. An emf device, in pyre x or in silica glass, was used to measure the tin chemical potential i n the binary (Sn, Sb) liquid phase and in the ternary (Pb, Sn, Sb) iso plethic cut x(Sn) = x(Sb). All this information was assembled in the f ifth order Redlich-Kister formalism for the integral Gibbs excess func tion of ternary (Pb, Sn, Sb) liquid alloys in the whole range of compo sitions. The excess entropy has been deduced from the comparison betwe en the mixing enthalpy and the excess Gibbs function.