Crystal Structure of (Ba<sub>1-</sub><i><sub>x</sub></i>La<i><sub>x</sub></i>)<sub>2</sub>In<sub>2</sub>O<sub>5+</sub><i><sub>x</sub></i> and Its Oxide Ion Conductivity

Crystal structures of (Ba1-xLax)2In2O5+x (x = 0.00, 0.20, 0.30, 0.40, 0.50) were analyzed and electrical conductivity were measured. The Rietveld results for (Ba1-xLax)2In2O5+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 (Ba1-xLax)2In2O5+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 (Ba1-xLax)2In2O5+x determined by blocking method is 1.00.