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

D. J. Min, N. Sano

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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.

Original languageEnglish
Pages (from-to)871-877
Number of pages7
JournalMetallurgical Transactions B
Volume20
Issue number6
DOIs
Publication statusPublished - 1989 Dec

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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