Thermochemistry of some binary lead and transition metal compounds by high temperature direct synthesis calorimetry

• Studied binary lead-transition metal alloys by high temperature calorimetry.
• Determined the enthalpies of formation of 8 alloys.
• Compared the measurements with predictions by the model of Miedema and by the ab initio method.

The standard enthalpies of formation of some binary lead and transition metal compounds have been measured by high temperature direct synthesis calorimetry. The reported results are: Pb3Sc5(−61.3 ± 2.9); PbTi4(−16.6 ± 2.4); Pb3Y5(−64.8 ± 3.6); Pb3Zr5(−50.6 ± 3.1); PbNb3(−10.4 ± 3.4); PbRh(−16.5 ± 3.3); PbPd3(−29.6 ± 3.1); PbPt(−34.7 ± 3.3) kJ/mole of atoms.We will compare our results with previously published measurements. We will also compare the experimental measurements with enthalpies of formation of transition metal compounds with elements in the same vertical column in the periodic table.We will compare our measurements with predicted values on the basis of the semi empirical model of Miedema and coworkers and with ab initio values when available.