Abstract
By constructing the following electrode concentration cell, the author measured the electromotive force corresponding to the change in Si and C in molten Fe-Si-C alloys: ⊕ Fe, Si, C|silicate slag|Si \ominusThe following equations were derived from this experiment in the range up to NSi=0.25 at 1,540°: & logγ_Si’=-2.5(1-N_Si)^2+0.13(1-N_Si)^-3& logγ_Si=-2.5(1-N_Si-N_C)^2+0.13(1-N_Si-N_C)^-3where γSi′ and γSi are the activity coefficients in Fe-Si and Fe-Si-C alloys respectively. Then the interaction coefficients, γSiC, and γCSi are discussed from the experimental results and theoretical calculations. Furthermore, the iso-activity lines of Si and C have been established in such alloys.
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