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| 概要 |
The electrical conduction properties of oxygen-deficient perovskite-type oxides were investigated by employing the emf method and the four-probe dc technique as a function of compositions, temperature...s, and surrounding oxygen partial pressures. The mean transference number, t_m, of LaAlO_3 doped with various divalent cations on the La^<3+> site increases with a decrease in the size of the cations, probably due to the decrease in the enthalpy of association, ΔH_a of an oxygen vacancy and a dopant cation. Fruther enlargements in the value of t_m are observed in the family of LaAlO_3 doped simultaneously with different cations on both the La^<3+> and Al^<3+> sites. From the results shown in figs. 6 and 7, the ionic conductivity of La_<0.8> Ca_<0.2> Al_<0.8> Mg_<0.2> O_<3-α> in the oxygen partial pressure of 10^<-5> atm is as good as that of (ZrO_2)_<0.85> (CaO)_<0.15>. The t_m of MZr_<1-x> M'_x O_<3-α> (M=Ca, Sr, Ba, M'=Mg, Al) is closely related to constituent cations on the A site in the perovskite-type oxides, rather than to dopant cations on the Zr^<4+> site and their concentrations, suggesting that the larger r_<crit> value, the less the disturbance of the surrounding cations for an oxygen ion migration, where r_<crit> stands for the radius of an ionic sphere which just touches the surrounding cations. On the whole, the ionic conductivity of La_<1-x> M_x Al_<1-y> M'_y O_<3-α> is superior to that of MZr_<1-x> M'_x O_<3-α>.続きを見る
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Mendeley出力
