Partial enthalpies of titanium, hafnium, tantalum, tungsten and iridium in liquid tin at high dilution

The partial enthalpies of titanium, hafnium, tantalum, tungsten and iridium in liquid tin at 1173K were measured at high dilution by direct reaction calorimetry (drop method) with the help of a Tian-Calvet high-temperature calorimeter. When referred to liquid metals we foundhTi/kJ.mol−1=106.3−25.6 xIr, hHf/kJ.mol−1=87.3+29.1 xHf, hTa/kJ.mol−1=102.7−9.6 xTa,hW/kJ.mol−1=94.9−58.2 xWandhIr/kJ.mol−1=−111.2−12.4 xIr. The limiting partial enthalpies were deduced by extrapolation to infinite dilution.