OXIDE-ION MIXED CONDUCTOR AND ITS APPLICATION

摘要

PROBLEM TO BE SOLVED: To provide a relatively inexpensive air electrode material for a solid- oxide-type fuel cell. SOLUTION: This oxide-ion mixed conductor has a composition represented by a formula La1-x Srx Fe1-yMyO3, where x is 0.02-0.50, M is one or more of Mg, Cr, Al, Ga, y is 0.02-0.25 for M=Mg, 0.02-0.50 for M=Cr, 0.02-0.45 for M=Al, 0.02-0.50 for M=Ga, and total of ys is not more than 0.55 for two or more Ms. This oxide-ion mixed conductor has a perovskite-type structure showing a constant and high electric conductivity in a temperature range of 500-1000 deg.C.