Incorporation of a proton into La_0.9Sr_0.1(Yb _{1 - X}M_x)O_{3 - δ} (M = Y, In)

In order to clarify the mixing effect of cation on the electrical conductivity and the hydration, the electrical conductivity of La _0.9Sr_0.1(Yb_{1 - x}M_x)O _{3 - δ} (M = In, Y) has been determined by the four-probe AC technique in the temperature range of 673-1173 K. The proton concentration was estimated from the change in weight due to hydration by a thermogravimetric analysis. The conductivity and proton concentration increased with the increase in the In^{3 +} content on the Yb-site. On the other hand, the electrical conductivity and protonic concentration of La_0.9Sr _0.1(Yb_{1 - x}Y_x)O_{3 - δ} showed minimum values at x = 0.5.