Abstract: To provide an NiO-GDC composite powder or NiO-SDC composite powder having a uniform composition, which is suitable as an anode material for a solid oxide fuel cell. A process for producing an anode material for a solid oxide fuel cell, made of a composite powder comprising a composite oxide containing cerium element and gadolinium or samarium element, and oxygen element, and an oxide containing nickel element and oxygen element, which comprises a dissolving step of mixing raw material compounds containing metal elements constituting the above composite powder, at least one organic acid selected from the group consisting of maleic acid, lactic acid and malic acid, and a solvent to obtain a metal elements-containing solution, and a drying/sintering step of drying and sintering the metal elements-containing solution.

Abstract: To provide a composite oxide powder for a solid oxide fuel cell containing lanthanum, strontium and/or calcium, manganese and oxygen and having a highly uniform composition, and its production method. A composite oxide powder containing lanthanum, strontium and/or calcium, manganese and oxygen, wherein the coefficient of variation (?) of lanthanum is at most 6.0% and the coefficient of variation (?) of manganese is at most 13.0%, as calculated from the peak area ratio of the L? ray of lanthanum and the K? ray of manganese measured by an energy dispersive X-ray spectrometer attached to a scanning electron microscope.

Abstract: To provide an air electrode material powder for a solid oxide fuel cell, comprising a novel LSCF powder having a highly uniform composition suitable as an air electrode material for a solid oxide fuel cell, and its production process. A composite oxide having a perovskite structure and containing lanthanum, strontium, cobalt, iron and oxide, wherein the dispersion point determined by the peak intensity [La] of the L?1 characteristic X-ray of lanthanum and the peak intensity [Sr] of the L?1 characteristic X-ray of strontium as obtained by EPMA measurement, is present within a range of the formula (1) and the dispersion point determined by the peak intensity [Co] of the K?1 characteristic X-ray of cobalt and the peak intensity [Fe] of the K?1 characteristic X-ray of iron is present within a range of the formula (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.

Abstract: To provide an air electrode material powder for a solid oxide fuel cell, comprising a novel LSCF powder having a highly uniform composition suitable as an air electrode material for a solid oxide fuel cell, and its production process. A composite oxide having a perovskite structure and containing lanthanum, strontium, cobalt, iron and oxide, wherein the dispersion point determined by the peak intensity [La] of the L?1 characteristic X-ray of lanthanum and the peak intensity [Sr] of the L?1 characteristic X-ray of strontium as obtained by EPMA measurement, is present within a range of the formula (1) and the dispersion point determined by the peak intensity [Co] of the K?1 characteristic X-ray of cobalt and the peak intensity [Fe] of the K?1 characteristic X-ray of iron is present within a range of the formula (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.

Abstract: To provide an NiO-GDC composite powder or NiO-SDC composite powder having a uniform composition, which is suitable as an anode material for a solid oxide fuel cell. A process for producing an anode material for a solid oxide fuel cell, made of a composite powder comprising a composite oxide containing cerium element and gadolinium or samarium element, and oxygen element, and an oxide containing nickel element and oxygen element, which comprises a dissolving step of mixing raw material compounds containing metal elements constituting the above composite powder, at least one organic acid selected from the group consisting of maleic acid, lactic acid and malic acid, and a solvent to obtain a metal elements-containing solution, and a drying/sintering step of drying and sintering the metal elements-containing solution.

Abstract: To provide a composite oxide powder for a solid oxide fuel cell containing lanthanum, strontium and/or calcium, manganese and oxygen and having a highly uniform composition, and its production method. A composite oxide powder containing lanthanum, strontium and/or calcium, manganese and oxygen, wherein the coefficient of variation (?) of lanthanum is at most 6.0% and the coefficient of variation (?) of manganese is at most 13.0%, as calculated from the peak area ratio of the L? ray of lanthanum and the K? ray of manganese measured by an energy dispersive X-ray spectrometer attached to a scanning electron microscope.