Abstract
Thermodynamic measurements in the MoRu system were made between 1150 and 1350 K by the e.m.f. method using solid galvanic cells in the arrangement Re¦Fe,Fe 0.95 O¦Zr(Ca)O 2 ¦MoO 2 ,MoRu¦Re. For this purpose, the isothermal section of the MoRuO system was investigated at 1273 K. The Ru(Mo) solid solution is in equilibrium with MoO 2 − x . The relative partial molar Gibbs energy of molybdenum was determined in the entire MoRu concentration range. The relative partial molar excess Gibbs energy of molybdenum in the h.c.p. Ru(Mo) solid solution at infinite dilution is xs Δ G ̄ Mo ∞ = −43 kJ mol −1 at 1200 K. The minimum of the Gibbs energy of formation was found at x Ru = 0.70; it is f ΔG °( Mo 0.3 Ru 0.7 ) = −8900 −0.6 T J mol −1 between 1150 and 1350 K. The minimum of the enthalpy of formation was found at x Ru = 0.85; it is f ΔH °( Mo 0.15 Ru 0.85 ) = −11 700 J mol −1 .
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