Hitachi Metals, Ltd.

Hitachi, Ltd.

Jyun Hayakawa

Akinori Nishide

Naoto Fukatani

Yosuke Kurosaki

Shin Yabuuchi

Ken Kurosaki

Sora-at Tanusilp

Sora-At Tanusilp

There is provided a thermoelectric material including a compound which is formed of an element R belonging to alkaline earth metal and lanthanoid, and an element X belonging to any of Group 13 elements, Group 14 elements, and Group 15 elements. The composition ratio of the element R and the element X is selected to obtain the compound having an AlBtype structure.

Thermoelectric material, thermoelectric module, and producing method of thermoelectric material

Provided are a p-type thermoelectric conversion material, a thermoelectric conversion module, and a method of manufacturing a p-type thermoelectric conversion material that are capable of obtaining high thermoelectric conversion characteristics. The p-type thermoelectric conversion material has a full Heusler alloy having a composition represented by the following General Formula (1) and has a relative density of 85% or more, FeTiMAMB. . . (1), wherein in Formula (1), MA is one element selected from the group consisting of Si, Sn, and Ge, MB is one element selected from the group consisting of Al, Ga, and In, and x, y, a, and b are numbers set so that x+y+a+b=100, a+b=z, 50&#x3c;x&#x2264;52.5, 20&#x2264;y&#x2264;24.5, 24.5&#x2264;z&#x2264;29, a&#x3e;0, and b&#x3e;0 in atom %, respectively.

P-type thermoelectric conversion material, thermoelectric conversion module, and method of manufacturing p-type thermoelectric conversion material

There is provided a thermoelectric conversion material formed of an FeTiSi-based full-Heusler alloy to which La is added, wherein La is solid-dissolved in the FeTiSi-based full-Heusler alloy.

Thermoelectric conversion material, thermoelectric conversion module using the same, and manufacturing method thereof

In order to provide an Fe2TiSi type full-Heusler thermoelectric conversion material having a high dimensionless figure-of-merit ZT, the full-Heusler thermoelectric conversion material is characterized in that: the full-Heusler thermoelectric conversion material has secondary crystal grains having an Fe2TiSi type composition and a coating layer covering the circumference of the secondary crystal grains and containing an element other than Fe, Ti, and Si as a main component; and the coating layer has a composition containing an element being dissolvable in a crystal structure of the Fe2TiSi type composition and having an electric resistivity lower than the secondary crystal grains.

Thermoelectric conversion material, method for producing same, and thermoelectric conversion module

Provided is a thermoelectric conversion material formed from a full Heusler alloy represented by the composition formula: Fe(TiM1)(AlM2). M1 represents at least one element selected from the group consisting of V, Nb and Ta, and M2 represents at least one element selected from the group consisting of Group 13 elements except for Al and Group 14 elements. &#x3b1; satisfies the relation: 0&#x3c;&#x3b1;&#x2264;0.42, &#x3b2; satisfies the relation: 0&#x2264;&#x3b2;&#x3c;0.75, and &#x3b4; satisfies the relation: 0&#x2264;&#x3b4;&#x3c;0.5. The valence electron concentration, VEC, satisfies the relation: 5.91&#x2264;VEC&#x3c;6.16.

Thermoelectric conversion material

A thermoelectric conversion material includes a matrix phase configured from a semiconductor. A first grain-boundary phase and a second grain-boundary phase are provided at a grain boundary of the matrix phase. The first grain-boundary phase is configured from a material which does not form a compound with the matrix phase by a eutectic reaction, a eutectoid reaction, a peritectic reaction, a peritectoid reaction, an eccentric reaction, or a segregation reaction. The second grain-boundary phase is configured from a material having resistance which is lower than that of the matrix phase or the first grain-boundary phase. A ratio of a volume of the second grain-boundary phase to a volume of the first grain-boundary phase is smaller than 1.

Thermoelectric conversion material and thermoelectric conversion module

The present invention provides a metal-based thermoelectric conversion material having a high figure-of-merit ZT, the thermoelectric conversion material being a p-type or n-type full-Heusler alloy, having a composition of an Fe2TiA type (wherein A is Si and/or Sn), and including crystal grains having an average grain diameter of 30-500 nm. In particular, in the case where the composition of an Fe2TiA type is represented by the empirical formula Fe2+&#x3c3;Ti1+yA1+z, the values of &#x3c3;, y, and z in an Fe&#x2014;Ti-A ternary alloy phase diagram lie within the range &#x3b1; surrounded by the points (50, 37, 13), (45, 30, 25), (39.5, 25, 35.5), (50, 14, 36), (54, 21, 25), and (55.5, 25, 19.5) in terms of (Fe, Ti, A) in at %.

Thermoelectric conversion material comprising a full-Heusler alloy and method for manufacturing the same by alloying and successively heating a raw material

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Tokyo, Japan

Jyun Hayakawa