Abstract
The e.m.f. of the galvanic cell: Pt or Chromel| C| MoTe 2( sα)| Te(s or l)| MoO 2( s)| ysz| air {p( O 2)=0.21p°}| Pt (where p o = 1 × 10 5 Pa and ysz denotes 15 mass per cent of Y 2O 3 stabilizing ZrO 2) was measured over the range 654 to 1065 K. From these e.m.f. results, the following least-squares expression was derived for the standard molar Gibbs free energy of formation of MoTe 2(s) from Mo(s) and Te(l) over the range 728 to 1065 K: Δ f G m °( MoTe 2, s,α) ( kJ· mol −1) =−(114.25−0.04397T/K)±2.39 Using a value of 13.88 for S m o R for MoTe 2(s) at 298.15 K reported in the literature, a value of −(90.32 ± 1.00) kJ·mol −1 was calculated by the third-law method for the standard molar enthalpy of formation of MoTe 2(s, α) at 298.15 K.
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