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

A technology of thermoelectric materials and compounds, applied in thermoelectric device node lead-out materials, chemical instruments and methods, polycrystalline material growth, etc., can solve the problems of expensive raw materials, low thermoelectric conversion efficiency, simple preparation process, etc., and achieve environmental friendliness , low cost and simple preparation process

Inactive Publication Date: 2021-04-30
CHINA ACADEMY OF SPACE TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of low thermoelectric conversion efficiency, expensive raw materials, and simple preparation process, the present invention provides a class of compounds that can be used as thermoelectric materials and a preparation method thereof. The compound has a unique chain crystal structure, the raw materials are cheap and easy to obtain, and the preparation process is simple , and has the advantages of high Seebeck coefficient, high electrical conductivity and low thermal conductivity, it is a thermoelectric material with excellent performance

Method used

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

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preparation example Construction

[0033] According to the second aspect of the present invention, a method for preparing a compound that can be used in thermoelectric materials is used to prepare the compound that can be used in thermoelectric materials in the first aspect, the compound is polycrystalline, including:

[0034] (1) Press Ln 2 ABQ 5 The chemical composition ratio selects the corresponding elemental substance or chalcogen compound as the raw material, weighs and mixes it under an inert atmosphere;

[0035] (2) Put the raw material into a sealed container such as a quartz glass tube that is isolated from water and oxygen, and then seal it after vacuuming; the sealed container such as a quartz glass tube after packaging is carried out at 500 ° C to 700 ° C for the first solid phase reaction, The reaction time is 12h-48h; after opening the closed container such as quartz glass tube, grinding and repackaging, the second solid phase reaction is carried out at 500°C-700°C, the reaction time is 48h-96h,...

Embodiment 1

[0048] La block, Cu powder, Sb powder and Se powder (mass percentage purity is respectively 99.9%, 99.99%, 99.99% and 99.999% the same below) in the glove box that is full of Ar gas according to La 2 CuSbSe 5 The stoichiometric ratio was weighed, mixed and vacuum-packed in a quartz glass tube, and then placed in a muffle furnace and slowly heated to 700°C for 24 hours. After the tube is opened, the powder is ground and repackaged, then placed in a muffle furnace and slowly raised to 700°C, reacted for 96 hours, and cooled with the furnace. The obtained pure phase powder is subjected to SPS sintering at a temperature of 500°C and 50Mpa, and finally a bulk thermoelectric material is made.

[0049] XRD diffraction patterns of bulk thermoelectric materials ( figure 2 ) indicates that a pure-phase polycrystalline sample was prepared by the above process. The material has good electrical conductivity, and the conductivity at room temperature is as high as 3.5S / cm ( image 3 ), ...

Embodiment 2

[0051] La block, Cu powder, Sb powder and Se powder were placed in a glove box filled with Ar gas according to La 2 CuSbSe 5 The stoichiometric ratio was weighed, mixed and vacuum-packed in a quartz glass tube, and then placed in a muffle furnace and slowly heated to 700°C for 24 hours. After the tube was opened, the powder was ground and repackaged, and then placed in a muffle furnace and slowly raised to 950°C for melting reaction. The reaction time was 12 hours, and then slowly lowered to room temperature. The obtained pure phase powder is subjected to SPS sintering at a temperature of 500°C and 50Mpa, and finally a bulk thermoelectric material is made.

[0052] The XRD diffraction pattern of the bulk thermoelectric material is similar to that of Example 1, indicating that a pure-phase polycrystalline sample is prepared by the above process. The electrical conductivity, Seebeck, thermal conductivity at room temperature, and thermoelectric figure of merit at room temperatu...

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Abstract

The invention provides a compound capable of being used for a thermoelectric material and a preparation method of the compound, the general formula of the compound is Ln2ABQ5, and Ln in the formula is any one or a combination of more than two of trivalent rare earth ions; A is any one or two of Cu or Ag; B is any one or two of Sb or Bi; Q is any one or a combination of more than two of S, Se or Te. The compound capable of being used for the thermoelectric material has a unique chain crystal structure, has the advantages of high seebeck coefficient, high electrical conductivity, low thermal conductivity and the like, and is a thermoelectric material with excellent performance, and the corresponding preparation method is simple in process step and cheap and easily available in raw materials so that the compound is convenient to popularize and apply.

Description

technical field [0001] The invention belongs to the technical field of thermoelectric materials, and in particular relates to a compound that can be used in thermoelectric materials and a preparation method thereof. Background technique [0002] With the increasingly prominent problems of fossil energy shortage and environmental pollution, the efficient multi-level utilization of energy has become a hot topic at present. Thermoelectric conversion technology is a green energy technology, which utilizes the Seebeck effect and Peltier effect of thermoelectric materials to realize the direct mutual conversion of thermal energy and electrical energy. This technology has the advantages of no pollution, no mechanical transmission, no noise, and high reliability. It has extremely important application prospects in the fields of industrial waste, waste heat recovery, space special power supply, and micro refrigeration devices. [0003] The core of thermoelectric conversion technolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/46C30B28/02C30B9/12C04B35/547C04B35/622H01L35/16
CPCC30B29/46C30B28/02C30B9/12C04B35/547C04B35/622C04B2235/40C04B2235/408C04B2235/42C04B2235/656C04B2235/666H10N10/852
Inventor 张弦姚伟
Owner CHINA ACADEMY OF SPACE TECHNOLOGY
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