Fe-Cu-Ce,Fe-P-Ce和Fe-Ti-Ce溶液的平衡产物是Ce_2O_2S,而不是Ce与Cu、P、Ti的金属间化合物。测定了Fe液中Ce_2O_2S=2[Ce]+[O]+2[S]反应的平衡常数和溶质之间的相互作用系数。Ce降低Cu和Ti在Fe液中的活度,增大其溶解度,同时增大P的活度,降低其溶解度。
The equilibrium products of Fe-Cu-Ce, Fe-P-Ce or Fe-Ti-Ce solution have beenidentified to be Ce_2O_2S, but not the intermetallic compounds of Ce against Cu, P or Ti.The equilibrium constant of Ce_2O_2S=2[Ce]+[O]+2[S] and the interaction coefficients betweensolutes in Fe-base solution have been determined as follows: K_(Ce_2O_2S)=2.57×10~(-15) e_(Ce)~(Cu)=-0.49; e_(Ce)~P=1.77; e_(Ce)~(Ti)=-3.62 e_(Cu)~(Ce)=-0.22; e_P~(Ce)=0.39; e_(Ti)~(Ce)=-1.23 ε_(Ce)~(Cu)=-128.0; ε_(Ce)~P=224.1; ε_(Ce)~(Ti)=-710.0The Ce decreases the activities of Cu and Ti in Fe-base solution and increases their solubilities,as well as increases the activity of P and decreases its solubility.
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