Determination of standard free energies of formation of Ca3P2 and Ca2Sn at high temperatures

D. J. Min, N. Sano

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The standard free energies of formation of calcium phosphide and calcium stannide were determined by a chemical equilibration technique, yielding the following results: 3Ca(1) + P2(g) = Ca3P2(s) ΔG° = -653,460(±7110) + 144.01(±4.98)T (J/mol)1000 °C to 1300 °C2Ca(1) + Sn(1) = Ca2Sn(s) ΔG° = -353,970(±1670) + 79.28(±1.26)T (J/mol)1000 °C to 1300 °C 1120 °C The experimental data to express the thermodynamics for removal of phosphorus and tin from molten iron by calcium based slags by other investigators were discussed in terms of the activity co-efficients of Ca3P2 and Ca2Sn in slag melts by using the present results described above.

Original languageEnglish
Pages (from-to)433-439
Number of pages7
JournalMetallurgical Transactions B
Issue number3
Publication statusPublished - 1988 Jun

All Science Journal Classification (ASJC) codes

  • Engineering(all)


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