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自射线照相表明,铁液中的 Ce,Nd 与 MgO,CaO 坩埚均有明显的作用.在保证Ce,Nd 与坩埚充分作用以达到平衡的条件下,应用放射性同位素~(141)Ce,~(147)Nd 及有机电解液电解法测定了铁液中溶解之 Ce,Nd 含量.用 ZrO_2(MgO)管组成的固体电解质电池测定了铁液中溶解氧的活度.计算出1550—1650℃范围内 Ce-O,Nd-O 平衡常数.对于反应 Ce_2O_(3(s))=2[Ce]+3[O]△G*_(Ce_2O_3)451150-161.68TlgK_(Ce_2O_3)=-(98611)/T+35.34对于反应 Nd_2O_3=2[Nd]+3[O]△G*_(Nd_2O_3)=375010-123.7TlgK_(Nd_2O_3)=-(81970)/T+27.04Nd 溶解于铁液的标准自由能 Nd(1)=[Nd]_(1%)△G*_(Nd)=19790-30.40Tlgγ*_(Nd)=(4326.1)/T-4.154
Self-radiography shows that the Ce, Nd and MgO, CaO crucible in the molten iron have a significant role in the application of the radioactive isotope of Ce, Ce 147) Nd and organic electrolyte electrolysis method was used to determine the dissolved Ce and Nd in the molten iron.The activity of dissolved oxygen in the molten iron was measured by a solid electrolyte cell consisting of ZrO_2 (MgO) tube.The calculated range of 1550-1650 ℃ (Ce (NO3) 3) = 2 (Ce) +3 [O] △ G * _ (Ce_2O_3) 451150-161.68TlgK_ (Ce_2O_3) = - (98611) / T + 35.34 For the reaction of Nd_2O_3 = 2 [Nd] +3 [O] △ G * _ (Nd_2O_3) = 375010-123.7TlgK_ (Nd_2O_3) = - (81970) /T +27.04Nd standard free energy Nd (1) = [Nd] _ (1%) ΔG * _ (Nd) = 19790-30.40Tlgγ * _ (Nd) = (4326.1) /T-4.154