Enthalpies of formation of Mo–Pt alloys by high temperature direct reaction synthesis calorimetry

Abstract

In the present work, the enthalpies of formation of Mo–Pt alloys are determined by high temperature direct reaction synthesis calorimetry at 1768 K (Mo 6Pt, ε′, MoPt 2, and (Pt) solid solution) and 1526 K (MoPt). The following values are reported: Δ f H 1768 K ( Mo 6 Pt ) = - 13.0 ± 1.9 kJ / mol · at. ; Δ f H ∘ ( ε ′ ) = - 26.1 ± 4.9 kJ / mol · at. ; Δ f H ∘ ( MoPt ) = - 27.7 ± 3.9 kJ / mol · at. ; Δ f H ∘ ( MoPt 2 ) = - 36.9 ± 1.8 kJ / mol · at. ; Δ f H ∘ ( Pt ) = - 27.1 ± 4.2 kJ / mol · at. The results are compared with predicted ab initio data.