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Thermodynamics of the Mn-P system

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Abstract

The free energy of mixing in the Mn-P melts in the composition range ofX p = 0.0 to 0.333 was estimated by coupling the phase boundary information with reliable ΔG° formation for the Mn2P phase. This information was used to obtain the dilute solution properties of P in Mn. P(l,pure) = P(l,Henrian, Mn) ΔG °(Joules) = -203,611.39 + 41.003T The free energy is shown to be more negative than in the Fe system, reflecting a stronger interaction between Mn and P atoms than between Fe and P atoms. Presenting the activity coefficient of P with the expression used by Lupis and Elliott, the first and second interaction coefficients are obtained as follows: ε PP (Mn) = 10.538 + 9728.14/T ρ PP (Mn) = 28.148 + 9101.83/T The Gibbs free energy of formation for Mn3P was estimated in the temperature range of {dy1233} to {dy1378} K to be 3Mn l + P(l = Mn3P(s ΔG °(Joules) = -241,461.65 + 65.031T

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  1. Technology Center, Elkem Metals Company, 4625 Royal Avenue, 14302, Niagara Falls, NY

    Y. E. Lee (Senior Engineer)

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Lee, Y.E. Thermodynamics of the Mn-P system. Metall Trans B 17, 777–783 (1986). https://doi.org/10.1007/BF02657140

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  • DOI: https://doi.org/10.1007/BF02657140

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