Fe-FeO-TiO₂系に関する熱力学的研究

抄録

The chemical potentials of oxygen in the Fe-FeTiO₃-TiO₂ and the Fe-FeTiO₃-Fe₂TiO₄ systems were measured by means of the following galvanic cell using zirconia solid electrolyte in the temperature range 800-1, 300°C
Pt/Ni, NiO//O^2-//Fe, FeO/Pt
Pt/Ni, NiO//O^2-//Fe, TiO₂, FeTiO₃/Pt
Pt/Fe, FeO //O^2-//Fe, TiO₂, FeTiO₃ /Pt
Pt/Ni, NiO// O^2-//Fe, FeTiO₃, Fe₂ TiO₄/Pt
Pt/Fe, FeO//O^2-//Fe, FeTiO₃, Fe₂TiO₄ /Pt
From the e. m. f. data, the following standard free energy changes were obtained:
Fe+FeTio₃+1/2O₂=Fe₂TiO₄;ΔG°=-65805+16.22T (cal)
Fe+TiO₂+1/2O₂=FeTiO₃;ΔG°=-69364+16.84T (cal)