The standard free energies of formation of CaO-Al2O3 intermediate compounds formed of CaO and Al2O3 have been measured by means of Galvanic cells using 4CaO·P2O5 solid electrolyte. The following results were obtained ; CaO·6Al2O3 : ΔG°f =- 16380-37.58 T (± 1 730) (1 3731 873K)CaO·2Al2O3 :ΔG°f =- 15 650- 25.82 T (± 900) (1 3731 873K) CaO·Al2O3 :ΔG°f = - 17 910-17.38 T (± 790) (1 3731 843K) 3CaO·Al2O3 : ΔG°f = - 11 790-28.27 T (± 1 190) (1 3731 635K) The unit is J/mol. The activity of CaO in liquid slag in equibrium with solid CaO·Al2O3 was 0.248 at 1 773K and that in equibrium with solid 3CaO·Al2O3 was 0.619. The standard state of CaO is pure solid.
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Nagata et al. (1989) studied this question.
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