| 摘要 |
PROBLEM TO BE SOLVED: To obtain a composite catalytic material in which fine particles having various functions according to the combination of a metal X and a metal Y are dispersedly precipitated. SOLUTION: A mixture in which the metallic element X having a strong affinity for a vapor-phase element Z is mixed with the metallic element Y having a weak affinity is heated and melted at a temperature not lower than the melting points of the metallic element X and metallic element Y, and the resultant melt is cooled at >=103 deg.C/s cooling rate or at zero gravity, by which a solid solution of the metallic element Y and the metallic element Y is prepared. Subsequently, the solid solution is heated in the atmosphere of the vapor- phase element Z having potential high enough to form a compound of the metallic element X and the vapor-phase element Z but not high enough to form a compound of the metallic element Y and the vapor-phase element Z, and the fine particles of the compound of the metallic element X and the vapor- phase element Z are dispersedly precipitated in the inner part of the metallic element Y or at its surface.
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