Influence of Pressurization on the Properties of (La_1−xSr_x)_1−z(Co_1−yFe_y)O_3−δ (x=0.4; y=0.8; z=0–0.04) as Cathode Materials for IT-SOFCs

Abstract

A-site deficiency was introduced into the perovskite-type oxides in the compositions (La_1−xSr_x)_1−z(Co_1−yFe_y)O_3−δ (x=0.4; y=0.8) with z=0, 0.02 and 0.04. Tolerance limit with the A-site deficiency for single perovskite phase was rather small, approximately 0.02. The electrical conductivity of the perovskites was investigated in a porous body at elevated temperatures in air with the pressures of 0.1–0.7 MPa. The pressurization slightly increases the conductivity. The A-site deficient material exhibits a higher physical reactivity than the stoichiometric one under the pressurized conditions.