Hitachi, Ltd.

Hitachi Metals, Ltd.

Akinori Nishide

Keiji Watanabe

Jun Hayakawa

Hiroyuki Yamamoto

Takao Ishikawa

Hiroaki Hasegawa

Tsukasa Fujimori

Futoshi Furuta

Yosuke Kurosaki

Jyun Hayakawa

Yuji Suwa

Yoshitaka Morimoto

Shin Yabuuchi

Yuzo Shirakawa

Naoto Fukatani

Ken Kurosaki

Masakuni Okamoto

Chiemi Kubota

Hideki Yamaura

Yusuke Yasuda

Sora-at Tanusilp

Shin Yabuchi

Akihiro Miyauchi

Daikoh Takamatsu

Sora-At Tanusilp

Shinichi Fujiwara

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

The present invention aims at providing a thermoelectric conversion module with low toxicity, which exhibits conversion efficiency equivalent to that of BiTe. The thermoelectric conversion module of the present invention employs a full Heusler alloy as the material for forming the P-type thermoelectric conversion unit and the N-type thermoelectric conversion unit. The material for forming the N-type thermoelectric conversion unit contains at least any one of Fe, Ti, and Si and Sn.

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

In order to provide a thermoelectric conversion element which has a high Seebeck coefficient, a low thermal conductivity, and a high performance, even if the material system that has a low environmental load and can reduce the cost is used, the thermoelectric conversion element in which lattice points are classified into two or more kinds (A site and B site), lattices of which the kinds are different are connected to each other, the numbers of lattices of which the kinds are different are different (A site: 2, and B site: 1), and a lattice structure is configured by arranging nanoparticles or semiconductor quantum dots, includes areas of which conductivity types are different.

Thermoelectric conversion element and thermoelectric conversion module

A thermoelectric conversion device includes a Heusler alloy film having a structure of Bor Lin notation of ABC and a pair of electrodes on the Heusler alloy film to output an electromotive force generated by a thermal gradient in the Heusler alloy film. The thermoelectric conversion device further includes an electrode for applying an electric field or a voltage to the Heusler alloy film to increase and control an electric conductivity and a Seebeck coefficient S of the Heusler metal film. The device can control to increase an electric conductivity and Seebeck coefficient S by applying an electric field or a voltage through an insulation film to the Heusler alloy film. The device may have a shared connection to select one of outputs of a plurality of thermoelectric conversion devices arranged in a matrix or increase an electromotive force as an output.

Thermoelectric conversion device

Growing community of inventors

Tokyo, Japan

Akinori Nishide