熔鉄中の共存元素の活量について (III) : 熔融 Fe-Mn 系の Mn の活量

概要

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By constructing the following electrode concentration cell and by a potentiometer, authors measured the electromotive force corresponding to the change in the manganese content in iron : [○!+], Fe-Mn | SiO_2-MnO-CaO-MgO | Mn [○!-] The temperature of the experiment was about 1, 590±5℃ and for the measurement of temperature, a Pt-Pt/Rh thermocouple was used. The theoretical relation between the electromotive force E (V) and the activity of manganese, α_<Mn> was as follows : E=(RT)/(nF)×(ln α^i_<Mn>)/(α_<Mn>)-(RT)/(nF)×lnα^i_<Mn>/α^i_<Mn>……(1) where α^i_<Mn>=the activity of manganese ion in the molten slag α^i_<Mn>=the activity of pure manganese when pure manganese was selected so as to be in a standard state, the following equation was obtained from eq. (1) : E=-0.0002T/n×log α_<Mn>……(2) n was approximately determined as n=2 by a calculation from the authors' data. From eq. (2) the activities of manganese were determined for all over the range. From the authors' result, Fe-Mn binary solution was recongnized to be approximately an ideal solution in all over the range. Judging from considerations made from several points of view, Fe-Ni and Fe-Co binary solution were also considered to follow the Raoults' law as in the case of Fe-Mn binary solution.
1954-12-25