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Novel low-thermal-conductivity argyrodite thermoelectric material and preparation method thereof

A technology of thermoelectric material and silver-germanium ore, which is applied in the direction of lead-out wire material of thermoelectric device and the manufacture/processing of thermoelectric device, which can solve the problems of low mechanical strength and easy breakage.

Inactive Publication Date: 2017-11-17
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the mechanical strength of this type of material is low, and the sample is very easy to break during the preparation process, so the preparation conditions are very important

Method used

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  • Novel low-thermal-conductivity argyrodite thermoelectric material and preparation method thereof
  • Novel low-thermal-conductivity argyrodite thermoelectric material and preparation method thereof
  • Novel low-thermal-conductivity argyrodite thermoelectric material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A new type of thermoelectric material whose chemical formula is Ag 9 GaSe 6 , according to the following preparation method, to obtain Ag 9 GaSe 6 Block material:

[0038] (1) Use simple substances with a purity greater than 99.99% as raw materials, weigh the ingredients according to the stoichiometric ratio, and place them in a sealed quartz tube for vacuum packaging;

[0039] (2) Heating with a muffle furnace, heating the quartz tube from room temperature to 1223K, melting and reacting the high-purity raw material at a high temperature, and keeping the temperature for 6 hours, then rapidly quenching and cooling to obtain the first ingot;

[0040] (3) Heating with a muffle furnace, heating the quartz tube from room temperature to 900K, performing annealing treatment, and after 3 days of heat preservation, rapid quenching and cooling to obtain the second ingot;

[0041] (4) Grind the second ingot into powder, place it in a graphite mold, heat it up to 900K at a rate...

Embodiment 2

[0043] This example is basically the same as Implementation 1, the difference is that in this implementation, the chemical formula is Ag 9 Ga 0.98 Cr 0.02 Se 6 .

Embodiment 3

[0045] This example is basically the same as Implementation 1, the difference is that in this implementation, the chemical formula is Ag 9 Ga 0.96 Cr 0.04 Se 6 .

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Abstract

The invention relates to a novel low-thermal-conductivity argyrodite thermoelectric material and a preparation method thereof. A chemical formula of the thermoelectric material is Ag9Ga1-XMx(Se1-YSy)6, wherein, M is one selected from Cr, Cd, Zn or Ge, 0< / =x< / =0.06, and 0< / =y< / =0.10; during preparation, a simple substance with the purity of more than 99.99% is used as a raw material, and ingredients are weighed according to the stoichiometric ratio and placed in a sealed quartz tube for vacuum packaging; a muffle furnace is used for heating, so that the high-purity raw material is subjected to a melt reaction at a high temperature and then to rapid quench cooling, to obtain a first ingot; the first ingot is vacuum packaged in the quartz tube, and is subjected to high temperature annealing treatment and then to rapid quench cooling, to obtain a second ingot; the second ingot is grinded into powder which is placed in a graphite mold, hot pressed sintering is carried out throguh induction heating and temperature rise in a vacuum atmosphere, then slow cooling is performed, and completing the preparation. Compared with the prior art, the thermoelectric material of the invention has the advantages of stable mechanical property, very low lattice thermal conductivity (0.2W / m K), and good application prospect.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and relates to a novel low thermal conductivity sulfur-silver-germanium ore thermoelectric material and a preparation method thereof. Background technique [0002] The non-renewable energy sources on the earth are gradually exhausted, and the environmental pollution situation is becoming more and more serious. The development and utilization of renewable clean energy sources is the future trend. In actual production and life, a large amount of energy is consumed in the form of waste heat, such as waste heat from factories, exhaust emissions from automobiles, etc. Thermoelectric energy conversion technology can directly realize the direct conversion between heat energy and electric energy, and is a typical technology for realizing clean energy. Thermoelectric energy conversion mainly relies on internal carriers to realize the transportation of electric energy and heat energy. During ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L35/16H01L35/34H10N10/852H10N10/01
CPCH10N10/852H10N10/01
Inventor 裴艳中李文林思琪
Owner TONGJI UNIV
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