Face-centered cubic structure alloy particles and method of manufacturing same
AssigneeDowa Electronics Materials Co., Ltd.
InventorKimitaka Sato
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Abstract
Alloy particles of an alloy having a face-centered cubic structure comprise at least one selected from Fe and Co and at least one selected from Pt and Pd as principal components. The alloy particles have a TEM-measured average grain size (DTEM) of not more than 50 nm, and a single crystallinity (DTEM)/(DX) that is less than 1.50, where (DX) is X-ray crystallite size. These alloy particles can be advantageously manufactured by using the polyol process to synthesize the alloy particles in the presence of a complexing agent.
Claims15
Alloy particles of an alloy having a face-centered cubic structure, comprising:
- at least one selected from Fe and Co and at least one selected from Pt and Pd as principal components,
- the alloy particles having a TEM-measured average grain size (DTEM) of not more than 50 nm, and a single crystallinity (DTEM)/(DX) that is less than 1.50, where (Dx) is X-ray crystallite size.
Alloy particles of an alloy having a face-centered cubic structure, comprising T and M in such a composition ratio that, when T is one or two selected from Fe and Co and M is one or two selected from Pt and Pd, X in formula TXM1-X is within the range 0.3 to 0.7, and, with respect to (T+M) no more than 30 atomic percent (including 0 percent) of metallic elements other than T and M, with the remainder being unavoidable impurities,
- the alloy particles having a TEM-measured average grain size (DTEM) of not more than 50 nm,
- in which 90 or more out of 100 particles satisfy equations (1) below, and equation (2) below is satisfied.
- 0.90Xav≦X1, X2, . . . X100≦1.10Xav (1)
- Standard deviation σ of X1, X2, . . . X100≦20% (2)
- provided that with respect to the value of X in the above TXM1-X, Xav represents a measured particle value (value of X in the mean constituent of a particle assemblage), and X1, X2, . . . X100 represents the measured X value of each of 100 particles arbitrarily selected when the measurement field of view contains 1000 or more particles.
In a method of manufacturing alloy particles of an alloy comprising T and M in which, when T is one or two selected from Fe and Co and M is one or two selected from Pt and Pd, X in formula TXM1-X is a content composition ratio that is within the range 0.3 to 0.7, and, with respect to (T+M) no more than 30 atomic percent (including 0 percent) of metallic elements other than T and M, with the remainder being unavoidable impurities, a method of manufacturing alloy particles of an alloy having a face-centered cubic structure by melting a metallic salt that contains the T component and M component to a state in which no solids remain in a solution constituted of polyvalent alcohol having a boiling point of 150° C. or above and/or derivatives thereof, using polyvalent alcohol and/or derivatives thereof to reduce the metallic salt with the solution at a temperature of 150° C. or above in an inert gas atmosphere, and progressing the reduction in the presence of a soluted complexing agent to synthesize particles of the alloy.
Dependencies are inferred from the claim text.