11-10-2018 дата публикации
Номер: US20180294394A1
Принадлежит:
There is provided a thermoelectric conversion material made of a full-Heusler alloy and capable of enhancing figure of merit. In order to solve the above problem, the thermoelectric conversion material is made of the full-Heusler alloy represented by the following composition formula: (FeM1)(TiM2)(AM3). A composition in a ternary phase diagram of Fe—Ti-A is inside a hexagon having points (50, 37, 13), (45, 30, 25), (39.5, 25, 35.5), (50, 14, 36), (54, 21, 25), and (55.5, 25, 19.5) as apexes. Further, an amount of change ΔVEC of an average valence electron number per atom VEC in the case of x=y=z=0 satisfies a relation 0<|ΔVEC|≤0.2 or 0.2<|ΔVEC|≤0.3. 1. A thermoelectric conversion material made of p-type or n-type full-Heusler alloy represented by a composition formula (Chemical Formula 1) below:{'br': None, 'sub': 1-x', 'x', '2+σ', '1-y', 'y', '1+φ', '1-z', 'z', '1+ω, '(FeM1)(TiM2)(AM3)\u2003\u2003(Chemical Formula 1),'}wherein the A is at least one element selected from a group including Si and Sn,the M1 and the M2 are at least one element selected from a group including Cu, Nb, V, Al, Ta, Cr, Mo, W, Hf, Ge, Ga, In, P, B, Bi, Zr, Mn, and Mg,the M3 is at least one element selected from a group including Cu, Nb, V, Al, Ta, Cr, Mo, W, Hf, Ge, Ga, In, P, B, Bi, Zr, Mn, Mg, and Sn,when the σ, the φ, and the ω satisfy a relation σ+φ+ω=0, andthe x, the y, and the z satisfy relations x=0, y=0, and z=0, respectively, contents of Fe, Ti, and A in the alloy represented by the composition formula (Chemical Formula 1) are u at %, v at %, and w at %, respectively, andwhen a composition of the alloy in a ternary phase diagram of Fe—Ti-A is represented by a point (u, v, w),the point (u, v, w) is located in a region inside a hexagon having points (50, 37, 13), (45, 30, 25), (39.5, 25, 35.5), (50, 14, 36), (54, 21, 25), and (55.5, 25, 19.5) as apexes in the ternary phase diagram,when a valence electron number of the M1 is m1,a valence electron number of the M2 is m2, anda valence ...
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