Abstract
The standard Gibbs energies of formation of Ca3As2, Ca3Sb2, and Ca3Bi2 were determined by a chemical equilibration technique yielding the following results: 3Ca(1)+2As(1)=Ca3As2 (s) ΔG°=−723,800+172.8T (±23,700)(J/mol) 1273 to 1573 K 3Ca(1)+2Sb(1)=Ca3Sb2(s) ΔG°=−726,300+159.3T(±24,600) (J/mol) 1273 to 1573K 3Ca(1)+2Bi(1)=Ca3Bi2(s) ΔG°=−696,400+195.6T(±23,200) (J/mol) 1148 to 1323 K
The thermodynamic data for removal of arsenic, antimony, and bismuth by other experimental investigations were discussed in terms of the activity coefficients of these compounds in slags. The stabilities of these compounds were also discussed by using the critical oxygen partial pressures calculated from the above equations.
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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 Ca3As2, Ca3Sb2, and Ca3Bi2 . Metall Trans B 20, 863–870 (1989). https://doi.org/10.1007/BF02670191
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DOI: https://doi.org/10.1007/BF02670191