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From a critical review of the existing experimental data, the free energy equations are presented. A new estimate is made of the standard free energy of formation of the hypothetical pure liquid P 2 O 5 , which is used in calculating the P 2 O 5 , activity coefficients from the experimental data of independent studies of slag-metal reactions. It is found that in low P 2 O 5 slags, log(γ P2O5 ) is a linear function of CaO from 0 to 60 %, independent of temperature. Whereas, in slags containing P 2 O 5 >10%. log(γ P2O5 ) is a linear function of CaO content>40 % only and increases with an increasing temperature. A novel concept of a slag-P 2 O 5 emf sensor is presented for experimental evaluation.

Assessment of P2O5 Activity Coefficients in Molten Slags.