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The fluthors measured the distribu tion equilibria oj oxygen between Liquid iron and soLid by directly equilibriating the liquid and solid phases. First, the melting point oj jJUrified iron (1 538°C) and the monotectic point (1528°C, 0.16%Q) were confirmed by analyzing the cooling curve. Next, the liquidus Line was confirmed and then the soLidus Line was determined. Both lines were nearly Linear. Final!;" the jJartition ratio oj oxygen between liquid iron and solid was determined to be 0.076; it was almost independent on tem/Jemture. Thus, the solubili~y oj oxygen in iJiron was determined to be 0.012° ~ at 1 528°C, and the heat oj Jusion q{ iron was Jound to be 3450 cal/mole, which was in good agreem,mt with the /JYesently known value.