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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 low thermoelectric conversion efficiency (6%-11%) [Xu Guiying, Research and Development Direction of Thermoelectric Materials, Materials Herald, 14, 2000, 38-41

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

Embodiment 1

[0040] Adopt Cu powder, Zn powder, Sn powder and S powder (mass percentage purity is respectively 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 (x = 0 ~ 0.10) chemical formula weighed and put into a glass tube, vacuum (less than 10 -2 Pa) and sealed with a hydrogen-oxygen flame, the glass tube containing the mixture was slowly heated to 450°C and kept for 24 hours, and then heated to 600°C-700°C for the first solid phase reaction, the reaction time was 24-96h. After the tube is opened, the powder is ground and repackaged for the second solid phase reaction. The conditions and reaction conditions are the same as the first solid phase reaction. The pure-phase powder obtained is subjected to SPS sintering at 650°C-800°C under a pressure of 40-60 MPa, and finally made into a bulk material for thermoelectric testing.

[0041] Polycrystalline XRD diffraction pattern ( figure 2 ) indicates that a pure-phase p...

Embodiment 2

[0043] Adopt Cu powder, Zn powder, Sn powder and S powder (purities are 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 a glass tube, vacuum (less than 10 -2 Pa) and then sealed with a hydrogen-oxygen flame, melting reaction at 700-1000°C, and SPS sintering of the obtained pure-phase powder at 650-800°C with a pressure of 40-60MPa, and finally made into a thermoelectric test bulk material.

[0044] The polycrystalline XRD diffraction pattern is similar to 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, thermal conductivity at room temperature, and thermoelectric figure of merit at room temperature are all comparable to those of Example 1.

Embodiment 3

[0046] Adopt Cu powder, Zn powder, Sn powder and S powder (purities are 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 Weigh the chemical formula (x=0~0.10) and put it into a high-energy ball mill jar, fill it with argon, seal it, and mill it for 5 hours. SPS sintering was carried out under pressure to finally make the bulk material for thermoelectric testing.

[0047] The polycrystalline XRD diffraction pattern is similar to 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, thermal conductivity at room temperature, and thermoelectric figure of merit at room temperature are all comparable 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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