Abstract
In order to obtain high ionic conducting materials based on perovskite structure for the electrolyte of Solid Oxide Fuel Cells (SOFCs), Ba2(Zn2/3B'1/3)2O5 (B'= Nb and Ta) and Ba2(Zn3/4W1/4)2O5 systems were synthesized by solid state reaction. Powder X-ray diffraction analysis revealed that the samples with B' = Nb and Ta in Ba2(Zn2/3B'1/3)2O5 had a cubic and a hexagonal perovskite-type structures, respectively, and that Ba2(Zn3/4W1/4)2O5 had a cubic NaCl structure. These materials exhibited the uptake of large amount of H2O and the appearance of high proton conductivity.