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Measurement of the Activity Coefficients of P and Mn in Carbon-Saturated Fe-P-Mn-C Alloy DONG JUN SHIN, XU GAO, SHIGERU UEDA, and SHIN-YA KITAMURA The thermodynamic properties of the Fe-P-Mn-C(sat.) alloy, which is obtained following the reduction of steelmaking slag or manganese ore, are not adequately clarified. Thus, the current study involved measuring the activity coefficients of both Mn and P in the alloy system. The Fe-P-Mn-C (sat.) alloy (2.5 to 15.2 mass pct of P and 2.9 to 12.8 mass pct of Mn) was equilibrated with Ag in a graphite crucible at 1673 K, and thus several thermodynamic data were obtained as follows: Interaction parameters: ePMnðCsat:Þ ¼  4:72  0:27; ðXMn

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