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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 slagmetal reactions. It is found that in low P 2 O 5 slags, log(g P 2 O 5 ) is a linear function of CaO from 0 to 60 %, independent of temperature. Whereas, in slags containing Pdoi:10.2355/isijinternational.40.964 fatcat:7pohct5unrew3ochodp2mkcrym