Compound capable of being used for thermoelectric material and preparation method thereof

A technology of thermoelectric materials and compounds, applied in the direction of thermoelectric device junction lead wire materials, etc., can solve the problems of low thermoelectric conversion efficiency, and achieve the effects of superior thermoelectric performance, improved mobility, and cheap and easy-to-obtain raw materials

Inactive Publication Date: 2010-06-09
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although thermoelectric materials have been studied for more than one hundred years, the current thermoelectric materials still have the disadvantage of

Method used

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  • Compound capable of being used for thermoelectric material and preparation method thereof
  • Compound capable of being used for thermoelectric material and preparation method thereof
  • Compound capable of being used for thermoelectric material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0039] Example 1:

[0040] Use Cu powder, Zn powder, Sn powder and S powder (the mass percentage purity is 99.7%, 99.99%, 99.9% and 99.999%, the same below) according to Cu 2 ZnSnS 4 And Cu doped sample Cu 2+x Zn 1-x SnS 4 The chemical formula of (x=0~0.10) is weighed and put into the glass tube, and vacuumed (less than 10 -2 Pa) is then sealed with a hydrogen-oxygen flame, and the glass tube containing the mixture is slowly heated to 450°C and kept for 24h, and then heated to 600°C to 700°C for the first solid phase reaction. The reaction time is 24 to 96h. After the tube is opened, the powder is ground and then packaged for the second solid-phase reaction, and the conditions and reaction conditions are the same as the first solid-phase reaction. The obtained pure phase powder is subjected to SPS sintering at a pressure of 40-60 MPa at 650°C to 800°C, and finally a bulk material for thermoelectric test is made.

[0041] Polycrystalline XRD diffraction pattern ( figure 2 ) Indicat...

Example Embodiment

[0042] Example 2:

[0043] Using Cu powder, Zn powder, Sn powder and S powder (purities of 99.7%, 99.99%, 99.9% and 99.999% respectively) according to Cu 2 ZnSnS 4 And Cu doped sample Cu 2+x Zn 1-x Sn S 4 (x=0~0.10) chemical formula weighed and put into the glass tube, vacuum (less than 10 -2 Pa) is then sealed with a hydrogen-oxygen flame and melted at 700~1000℃. The pure phase powder obtained is sintered at 650℃~800℃ and 40~60MPa pressure, and finally made into thermoelectric test The bulk material.

[0044] The polycrystalline XRD diffraction pattern is similar to that of Example 1, indicating that we have obtained a pure phase polycrystalline sample. The electrical conductivity of the material is similar to that of Example 1, and the Seebeck coefficient, the room temperature thermal conductivity, and the thermoelectric figure of merit at room temperature are all equivalent to those of Example 1.

Example Embodiment

[0045] Example 3:

[0046] Using Cu powder, Zn powder, Sn powder and S powder (purities of 99.7%, 99.99%, 99.9% and 99.999% respectively) according to Cu 2 ZnSnS 4 And Cu doped sample Cu 2+x Zn 1-x SnS 4 (x = 0~0.10) The chemical formula is weighed and put into a high-energy ball mill tank, filled with argon gas protection, sealed, ball milled for 5h, and the pure phase powder obtained is heated at 650℃~800℃ at 40~60MPa SPS is sintered under pressure, and finally the bulk material for thermoelectric test is made.

[0047] The polycrystalline XRD diffraction pattern is similar to that of Example 1, indicating that we have obtained a pure phase polycrystalline sample. The electrical conductivity of the material is similar to that of Example 1, and the Seebeck coefficient, the room temperature thermal conductivity, and the thermoelectric figure of merit at room temperature are all equivalent to those of Example 1.

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Abstract

The invention relates to a compound (A2BCQ4) capable of being used for a thermoelectric material and a preparation method thereof, wherein A is Cu, Ag or Au; B is any one of the divalent ions such as Zn, Cd, Hg, Fe, Ni, Pd and the like, or any one of the trivalent ions such as B, Al, Ga, In and the like; C is any one of the tetravalent ions such as Si, Ge, Sn, Pb and the like or any one of the trivalent ions such as B, Al, Ga, In and the like; and Q is S, Se and Te, or N, P, As and Sb. Properly speaking, the A2BCQ4 belongs to a tetragonal system, has a deformed blende superlattice structure and is similar to chalcopyrite (CuFeS2), and only half of Fe positions is occupied by B while the other half is occupied by C. The unique structure of the compound determines that the material of the type has considerable thermoelectric properties. The compound provided by the invention can be used for the thermoelectric material, has a unique design idea, low-price and readily available raw materials, and a simple preparation process, and the material has superior electric conductivity and superior thermoelectric properties and is a perfect novel thermoelectric candidate material.

Description

technical field [0001] The invention relates to a class of compounds that can be used for thermoelectric materials and a preparation method, belonging to the field of thermoelectric materials. Background technique [0002] The thermoelectric effect is a general term for the reversible thermal effect caused by electric current and the electric effect caused by temperature difference. It includes: Seebeck (Seebeck) effect, Peltier (Peltier) effect and Thomson (Thomson) effect. Thermoelectric materials are functional materials that directly convert thermal energy to electrical energy, and have extremely important application prospects in the fields of thermoelectric power generation and refrigeration, constant temperature control and temperature measurement. [0003] With the development of science and technology, energy issues and environmental issues have become hot topics that people are more and more concerned about. Thermoelectric materials are environmentally friendly f...

Claims

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Application Information

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IPC IPC(8): C04B35/515
CPCC22C1/058B22F9/16C22C9/00H01L35/16C22C5/06C22C5/02H10N10/852
Inventor 黄富强刘敏玲陈立东
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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