Knudsen Cell-mass Spectrometric Study of the Thermodynamic Properties of Fe-Mo Alloys
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A technique of Knudsen cell-mass spectrometric determination of activity of iron-refractory metal alloys was devised. The technique consists of the measurement of ion intensity of internal standard material, Fe or Ag, at lower temperature and the measurement of ion intensity of Fe from the sample at experimental temperature. This technique was applied to Fe-Mo alloys to determine the activities over the entire composition range at 1 823K.The activity curves are determined over the entire composition range at 1 823K. The following values were obtained. γ°Mo(s)=1.54, γ°Mo(l)=0.7 and γ°Fe(l)=6.0Interaction parameters were also determined.The free energy change for the reaction Mo(s)=Mo (hypothetical Henrian 1 wt% in liquid Fe) is given by ΔG°=27 100-54.1T J/g-atom.The heat of sublimation of δ-Fe was also determined from the ion intensities at A4 and m.p. temperatures.The heat of sublimation and melting of Fe are ΔHs(α)298=414kJ/g-atom and ΔHm1 809=15.1kJ/g-atom.
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The Iron and Steel Institute of Japan | 論文
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