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本工作应用放射性同位素技术和无水电解液电解法测定铁液中溶解态稀土的含量,用直接比色法分析和计算铁液中溶解态的Al含量,在稀土作用过的Al_2O_3坩埚内,使用ZrO_2(MgO)固体电解质浓差电池直接测定铁液中溶解态的氧活度。用外推法求得铁液中RE-Al-O平衡常数K_(REAlO_3)和相互作用系数e_(RE)~(Al)与温度的关系式。 对于CeAlO_(3(2))=[Ce]+[Al]+3[O]平衡反应 lgK_(CeAlO_3)=-37900/T+5.84 △G_(CeAlO_3)~0=173400-26.7T(cal/mol) e_(Ce)~(Al)=20500/T-13.53 对于NdAlO_(3(3))=[Nd]+[Al]+3[O]平衡反应 lgK_(NdAlO_3)=-24700/T+O.69 △G_(NdAlO_3)~0=113030-3.16T(cal/mol) e_(Nd)~(Al)=13500/T-9.33

Equilibrium of Ce-Al-O or Nd-Al-O system in molten iron was studied by separately smelting the radioactive isotope of ~(141)Ce or ~(147)Nd in an Al_2O_3 crucible filled with pure iron to form ~(141)CeAlO_3 or ~(147)NdAlO_3 around its inner wall. The content of dissolved Ce or Nd in iron was determined by means of radioassay and electrolysis in organic electrolyte. The analysis of dissolved Al in iron was obtained by colorimetry and followed by calculation. The activity of oxygen as dissolved state in liquid iron was directly measured by solid electrolyte sensors made of ZrO_2(MgO) tube. By extrapolation of data obtained, the temperature dependence of equilibrium constant of RE-Al-O in molten iron, K_(REAlO_3) or of interaction coefficient, e_(RE)~(Al), may be described as: For reaction CeAlO_(3(s)=[Ce]+[Al]+3[O] lg K_(CeAlO_3)=-37900/T+5.84 △G_(CeAlO_3)~0=175400-26.7T cal/mol e_(Ce)~(Al)=20500/T-13.53 For reaction NdAlO_(3(s)) =[Nd]+[Al]+3[O] lg K_(NdAlO_3)=-24700/T+0.69 △G_(NdAlO_3)~0=113030-3.16T cal/mol e_(Nd)~(Al)=13500/T-9.33

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