Crystal Structure of (Ba_1-xLa_x)₂In₂O_5+x and Its Oxide Ion Conductivity

Abstract

Crystal structures of (Ba_1-xLa_x)₂In₂O_5+x (x = 0.00, 0.20, 0.30, 0.40, 0.50) were analyzed and electrical conductivity were measured. The Rietveld results for (Ba_1-xLa_x)₂In₂O_5+x (x = 0.20, 0.40) revealed that these oxides belonging to cubic Pm3m space group. This result indicated that the oxide ion vacancies distribute randomly in the cubic perovskite type structure. The electrical conductivities of (Ba_1-xLa_x)₂In₂O_5+x (x = 0.20, 0.40, 0.50) did not show a sharp discontinuity because the disorder phase of defective perovskite type structure was stabilized at low temperature by doping La³⁺ cations. The oxide ion transference number of the (Ba_1-xLa_x)₂In₂O_5+x determined by blocking method is 1.00.