Thermodynamics of phosphorus in molten Si-Fe and Si-Mn alloys

Shigeru Ueda, Kazuki Morita, Nobuo Sano

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20 Citations (Scopus)


The thermodynamics of phosphorus in molten Si-Fe and Si-Mn alloys has been investigated at 1723 K by equilibrating the alloys in a controlled phosphorus partial pressure. The activity coefficient of phosphorus in each alloy shows a maximum value at a certain composition due to a strong interaction between silicon and iron and between silicon and manganese. Interaction coefficients between phosphorus and iron in molten silicon were found to be εPFe = 7.43 and ρPFe = -16.4 (0 ≤ X §0.65), and those between phosphorus and manganese were εPFe = 12.0 and ρPFe = -22.2 (0 ≤X ≤0.5). Further discussion has revealed that the Si-Fe-P and Si-Mn-P systems approximately conform to a regular solution within the composition ranges investigated in the present work.

Original languageEnglish
Pages (from-to)1151-1155
Number of pages5
JournalMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Issue number6
Publication statusPublished - 1997


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