| 摘要 |
The present invention is an electrically conducting ceramic having improved electrical conductivity which comprises a perovskite-type composite oxide of a composition represented by the following formula(La1-x-yAxBy)z(Mn1-uCu)vO delta wherein A represents at least one type of atom selected from the group consisting of Sc, Y, Nd, Yb, Er, Gd, Sm and Dy, B represents at least one type of atom selected from the group consisting of Ba, Sr and Ca, and C represents at least one type of atom selected from the group consisting of Co, Fe, Ni, Ce, Zr, Mg, Al, Sb and Cr, and x, y, z, u, v and delta are the numbers that satisfy the following formulas:0.02</=x</=0.5,0.1</=y</=0.6,0.90</=z</=1.05,0</=u</=0.5,v=1.0, and at a temperature of 1000 DEG C. in the open air,2.97</= delta </=3.04.A tubular-type fuel cell containing an electroconductive ceramic in accordance with this invention as an air electrode does not deform during operation for long period of time and yields a stabilized output and a planar type fuel cell which is free from peeling of air electrodes or does not decrease its output by the deformation of the cell.
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