Abstract
The relative partial molar Gibbs energies of vanadium in the vanadium-carbon system have been determined for the V-C alloys containing 36.7, 41.2, 43.1, 44.8, 45.5, 46.8, 50.5, and 54.0 at. pct carbon by using galvanic cells of the type (−) V, VF3, CaF2 // CaF2 // CaF2, VF3, ‘V-C’ (+) The measurements were carried out in the temperature range of 816 to 1008 K. The relative partial molar Gibbs energies of carbon have been calculated in the same composition range. The relative integral molar Gibbs energy in the VC single-phase region can be expressed asG M = −98,850 + 72,242XC + (24.81 −37.23X C)TJ/mol The standard Gibbs energies of formation of V4C3-x and V2CC can be represented as ΔG° = −67,208 + 9.37T J/mol of V0.60C0.40 and ΔGδ = −62,581 + 7.10T J/mol of Va66Co.34 respectively.
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Sichen, D. Standard gibbs energies of formation of the carbides of vanadium by emf measurements. Metall Trans B 21, 313–320 (1990). https://doi.org/10.1007/BF02664199
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DOI: https://doi.org/10.1007/BF02664199