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

D. J. Min; N. Sano

doi:10.1007/BF02670192

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

D. J. Min, N. Sano

Department of Materials Science and Engineering

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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+580.0 T(±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 Ba_1.5P in molten Ba saturated with CaO.

Original language	English
Pages (from-to)	871-877
Number of pages	7
Journal	Metallurgical Transactions B
Volume	20
Issue number	6
DOIs	https://doi.org/10.1007/BF02670192
Publication status	Published - 1989 Dec 1

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All Science Journal Classification (ASJC) codes

Engineering(all)

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Min, D. J., & Sano, N. (1989). Determination of the standard gibbs energies of formation of Ba₃P₂ and Ba₃(PO₄)₂. Metallurgical Transactions B, 20(6), 871-877. https://doi.org/10.1007/BF02670192

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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+580.0 T(±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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N2 - 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+580.0 T(±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.

AB - 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+580.0 T(±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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10.1007/BF02670192