クヌーセン・セル質量分析法による溶融鉄-りん二元系合金の活量の測定

概要

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The activities of P and Fe in a dilute solution of P in liquid iron at 1600℃ have been determined with a combination of a mass spectrometer and a Knudsen cell ; a magnetic deflection type mass spectrometer was used. A pulse counting system was used for the measurement of the ion currents of P^+ and P^+_2, for the intensities of these ions were very small ; the relatively large ion currents of Fe were measured with a DC amplifying system. The whole system was computer-controlled, and a high sensitivity with a large dynamic range and considerable resolution could be obtained by using this system. The range of the concentration of phosphorus was from 0.7wt% to 3.2wt% (1.3at% to 5.7at%), and the method based on the GIBBS-DUHEM relation was used to obtain the interaction coefficient, ε^P_P from the obtained ion current ratios, and ε^P_P=7.3±0.1 was obtained. The accuracy and the precision of the obtained value are discussed.
社団法人日本鉄鋼協会の論文
1979-02-01