Abstract
Equilibrium of Ce‐Al‐O or Nd‐Al‐O system in molten iron was studied by separately melting radioactive isotope 141Ce or 147Nd in an Al2O3 crucible filled with pure iron to form 141CeAlO3 or 147NdAlO3 around its inner wall. The content of dissolved Ce or Nd in iron was determined by means of electrolysis in anhydrous electrolyte and radioassay. The concentration of dissolved Al in iron was obtained by photometry and followed by calculation. Activity of oxygen in liquid iron was directly measured by solid electrolyte sensors made of ZrO2(MgO) tube. By extrapolation of data obtained, the temperature dependence of the equilibrium constant of RE‐Al‐O in molten iron, , or of interaction coefficient, may be described as: urn:x-wiley:01774832:srin01171:equation:srin01171-math-0001
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