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Determination of the standard gibbs energies of formation of Ba3P2 and Ba3(PO4)2

  • Physical Chemistry
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Abstract

The standard Gibbs energies of formation of barium phosphide and barium orthophosphate were determined by a chemical equilibration technique yielding the following results: 3Ba(1)+P2(g)=Ba3P2 (s) ΔG°=−732,000+156.1T(±12,800) (J/mol) 3BaO (s)+P2(g)+5/2O2(g)=Ba3(PO4)2(s) ΔG°=−2,523,000+580.0T(±16,600) (J/mol)

The stability and the thermodynamic behavior of barium compounds as reaction products of dephosphorization of steel were discussed in terms of the oxygen partial pressure and the activity coefficient of Ba1.5P in molten Ba saturated with CaO.

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Authors and Affiliations

  1. Department of Metallurgical Engineering and Materials Science, Carnegie Mellon University, 15213, Pittsburgh, PA

    D. J. Min

  2. Department of Metallurgy, University of Tokyo, Bunkyo-ku, 113, Tokyo, Japan

    N. Sano (Professor)

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  1. D. J. Min
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  2. N. Sano
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D.J. MIN, formerly Graduate Student, Department of Metallurgy, The University of Tokyo, Bunkyo-ku, Tokyo 113, Japan

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Min, D.J., Sano, N. Determination of the standard gibbs energies of formation of Ba3P2 and Ba3(PO4)2 . Metall Trans B 20, 871–877 (1989). https://doi.org/10.1007/BF02670192

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  • DOI: https://doi.org/10.1007/BF02670192

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