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Thermoelectric conversion material

A technology of thermoelectric conversion materials and valence electrons, which is applied in the fields of thermoelectric device node lead-out materials, transportation and packaging, metal processing equipment, etc., can solve the problems of high cost, strong Te toxicity, etc., and achieve the effect of improving the performance index

Active Publication Date: 2018-01-02
HITACHI METALS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in Bi-Te-based semiconductors, there are problems such as strong toxicity of Te and high cost.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment approach

[0093]

[0094] in the synthesis of Fe 2 TiSi series full Heusler alloy or Fe 2 TiSn-based full Heussler alloy (hereinafter referred to as Fe 2 TiA series full Heusler alloy), add appropriate additives, that is, replace any one of Fe, Ti, and A with appropriate elements, and control the average number of valence electrons VEC per atom, so that ΔVEC described later is called 02 TiA-based full Heusler alloys exhibit high performance indices.

[0095] The details will be described below.

[0096] First, the average number of valence electrons VEC (hereinafter, may also be referred to as VEC) per atom will be described.

[0097] The so-called VEC is the average number of electrons in the outermost shell of an atom, and is a value obtained by dividing the total number of valence electrons Z of the compound by the number a of atoms in the unit cell.

[0098] For example Fe 2 In the case of TiSi, iron (Fe) has 8 valence electrons, titanium (Ti) has 4 valence electrons, and sil...

Embodiment

[0241] Hereinafter, this embodiment will be described in more detail based on examples. It should be noted that the present invention is not limited to the following examples.

[0242] The thermoelectric conversion material of the present invention was produced by the following method.

[0243] First, for the containment with 2 L2 represented by E2E3 1 A thermoelectric conversion material of a full Heusler alloy having a type crystal structure uses iron (Fe), titanium (Ti), and silicon (Si) as raw materials for the main components of each of the E1 site, E2 site, and E3 site. In addition, copper (Cu), vanadium (V), and tin (Sn) were used as raw materials of the main component substituted at each of the E1-position, E2-position, or E3-position. Then, each raw material is weighed so that the produced thermoelectric conversion material has a desired composition.

[0244] Next, the raw material was placed in a container formed of stainless steel in an inert gas atmosphere, and...

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Abstract

The present invention addresses the problem of providing a thermoelectric conversion material which comprises a full Heusler alloy and with which the performance coefficient can be improved. In orderto solve the above problem, provided is a thermoelectric conversion material comprising a full Heusler alloy represented by composition formula (Fe1-xM1x) 2+sigma (Ti1-yM2y) 1+phi (A1-zM3z) 1+omega. In the Fe-Ti-A ternary phase diagram, the composition is within a hexagon formed by peaks at (50, 37, 13), (45, 30, 25), (39.5, 25, 35.5), (50, 14, 36), (54, 21, 25) and (55.5, 25, 19.5). Moreover, theamount of change [delta]VEC in the average electron number VEC in terms of x=y=z=0 satisfies 0<|[delta]VEC|<=0.2 or 0.2<|[delta]VEC|<=0.3.

Description

technical field [0001] The present invention relates to thermoelectric conversion materials. Background technique [0002] In recent years, the CO 2 Attention is being raised to reduce CO 2 The resource energy is shifting to natural energy, thermal energy reuse and other next-generation energy, and technological innovation is being promoted. Candidates for next-generation energy technologies include technologies that utilize natural energy such as sunlight and wind power, and technologies that reuse primary energy loss components such as heat and vibration that are emitted by utilizing resource energy. [0003] In contrast to conventional resource energy, which was concentrated energy mainly based on large-scale power generation facilities, next-generation energy is characterized by uneven distribution of both natural energy and recycled energy. In the current energy utilization, the unused and discharged energy is as high as about 60% of the primary energy, and its form ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L35/14C22C38/00B22F3/14
CPCB22F3/14C22C38/008C22C38/02C22C38/12C22C38/14C22C38/16C21D2201/03C21D2241/02B22F2998/10B22F2999/00C22C30/00C22C30/02C22C30/04H10N10/851H10N10/854B22F2202/05B22F9/08B22F9/008B22F1/08B22F1/142B22F3/105C22C38/00
Inventor 西出聪悟深谷直人早川纯籔内真黑崎洋辅
Owner HITACHI METALS LTD
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