| abstract |
The present invention is to further improve the chemical stability of the perovskite-type oxide mixed ion conductor in consideration of the use environment in a fuel cell.n n n Formula Ba a (Ce 1-b M 1 b ) L c O 3-r (M 1 is a trivalent rare earth element except Ce, L is Zr, Ti, V, Nb, Cr, Mo, W, Fe, Co, At least one element selected from Ni, Cu, Ag, Au, Pd, Pt, Bi, Sb, Sn, Pb and Ga, a is at least 0.9 and at most 1, b is at least 0.16 and at most 0.26, c is at least 0.01 and 0.1 Hereinafter, r is a mixed ion conductor made of a perovskite oxide represented by (2 + b-2a) / 2 or more and less than 1.5). Or a mixed ion conductor made of barium zirconium-based or barium zirconium cerium-based perovskite oxide. |