AIR-ELECTRODE MATERIAL POWDER FOR SOLID OXIDE FUEL CELL AND MANUFACTURING PROCESS THEREFOR

摘要

Provided are: an air-electrode material powder for a solid oxide fuel cell, said air-electrode material powder consisting of a novel LSCF powder which has a highly uniform composition and is thus suitable as an air-electrode material for a solid oxide fuel cell; and a process for manufacturing the same. A composite oxide which comprises lanthanum, strontium, cobalt, iron and oxygen and which has a perovskite structure such that when the composite oxide is subjected to measurement with an electron probe micro analyzer (EPMA), the distribution points determined from both the peak intensities [La] of Lalpha1 characteristic X-ray from lanthanum and the peak intensities [Sr] of Lalpha1 characteristic X-ray from strontium are present in the region satisfying relationship (1), while the distribution points determined from both the peak intensities [Co] of Kalpha1 characteristic X-ray from cobalt and the peak intensities [Fe] of Kalpha1 characteristic X-ray from iron are present in the region satisfying relationship (2). a[La]-150 <= [Sr] <= a[La]+150 ··· (1) b[Co]-300 <= [Fe] <= b[Co]+300 ··· (2) (wherein 0.2 <= a <= 1.0 and 0.1 <= b <= 4.0)