[Pd-Sn] system: enthalpies of formation of the liquid [Pd+Sn] and heat capacities of PdSn, PdSn2,, PdSn3, and PdSn4 compounds

Using high temperature calorimeters, the molar enthalpies of formation of s ome [Pd-Sn] liquid alloys have been measured at 952, 1058, 1108, 1184, 1193 , 1208, 1240, 1292 and 1372 K. The coordinates of the extremum of the Delta (mix)H(m)(o)=f(x(Pd)) have been estimated (Delta(mix)H(m)(o)=-73 kJ mol(-1) with x(Pd)=0.71). Besides, the limiting molar partial enthalpies of liquid tin was extrapolated (Delta(mix)h(m)(o)(Pd liq. in infinity liquid Sn)=-12 0+/-6 kJ mol(-1)) and some points of the liquidus were determined. With ano ther technique, differential scanning calorimetry, the molar heat capacity of four solid alloys (PdSn, PdSn2, PdSn3 and PdSn4) have been measured. (C) 1999 Elsevier Science S.A. All rights reserved.