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High-temperature thermodynamic properties of the vanadium carbides V2C and VC0.73 determined using a galvanic cell technique

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Abstract

The standard free energies of formation of V2C and VC0.73 have been obtained from electromotive force (emf) measurements on the following galvanic cells with BaF2-BaC2 solid solutions as the electrolyte: Ta, Ta2CBaF2-BaC2V, V2 (850 to 1200K) (D) VC0.73, V2C BaF2-BaC2 Cr, Cr23C6 (850 to HOOK) (E) VC0.73, V2C BaF2-BaC2 Mo, Mo2C (890 to 1247 K) (F) Combining the results of this study with previous work1151 and those of Kukarniet al., [19.25] the following equations for ΔGf° of V2C and VC0.73 have been determined: From cell (D), ΔGv2c°(±1263) = -152,824(±9200) + 5.45(±0.27)7 Joule for the reaction 2V + C = V2C. From cell (E), ΔGvc 0.73°(±662) = -96,790.8(±6511.7) + 7.0(±0.3)r Joule/g * atom V From cell (F), ΔGvc 0.73°(±665) = -97,000(±4606) + 6.79(±0.78)J Joule/g * atom V for the reaction V + 0.73C = VC0.73.

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Authors and Affiliations

  1. Department of Materials Science, Universidad Simon Bolivar, 1080, Caracas, Venezuela

    R. G. Coltters (Professor) & Z. Nava (Assistant Professor)

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  1. R. G. Coltters
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  2. Z. Nava
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Coltters, R.G., Nava, Z. High-temperature thermodynamic properties of the vanadium carbides V2C and VC0.73 determined using a galvanic cell technique. Metall Trans B 22, 661–668 (1991). https://doi.org/10.1007/BF02679021

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