質量分析法による PbO-P_2O_5 系および Fe_tO-P_2O_5 系の P_2O_5 の活量測定

概要

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The activities of P_2O_5 in the PbO-P_2O_5 system at 1300℃ and in the Fe_tO-P_2O_5 system at 1370℃-1390℃ have been determined by the use of the combination of a mass spectrometer and a KNUDSEN-cell using the relation (P_2O_5)+PO(g)=3PO_2(g). The obtained resultes are as follows. The PbO-P_2O_5 system : The GIBBS-DUHEM relationship has been found to exist between the activity of P_2O_5 obtained from the ion currents of PO^+ and PO^+_2 and that of PbO obtained from the ion currents of PbO^+. The existence of such relationship confirms the validity of mass spectrometric determination of the activity of P_2O_5 in slags from the ion currents of PO^+ and PO^+_2. The Fe_tO-P_2O_5 system : This system has been found to obey HENRY's law up to 0.08 mole fraction of P_2O_5. The following activity coefficients of P_2O_5 were obtained at 1370℃-1390℃ from the ion currents of PO^+ and PO^+_2. γ_<P_2O_5>=(2.2±0.8)×10^<-15> at 1370℃ =(2.5±0.8)×10^<-15> at 1380℃ =(2.8±1)×10^<-15> at 1390℃ 0<X_<P_2O_5><0.08 (Standard state : P_2O_5 (solid))
社団法人日本鉄鋼協会の論文
1985-12-01