Argyrodite thermoelectric material and preparation method thereof

A technology of thermoelectric materials and sulfur silver germanium ore, which is applied in the direction of thermoelectric device node lead wire materials, thermoelectric device manufacturing/processing, etc., can solve the problems of fragility, difficult to determine the preparation conditions, low mechanical strength, etc., and achieve high Effects of mechanical strength and high thermoelectric performance

Inactive Publication Date: 2016-11-09
TONGJI UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the mechanical strength of this kind of material is low, the sample is very easy to break during the preparation process, and the suitable preparation conditions are difficult to determine, which greatly limits the development of sulfur silver germanium ore in the field of thermoelectricity

Method used

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  • Argyrodite thermoelectric material and preparation method thereof
  • Argyrodite thermoelectric material and preparation method thereof
  • Argyrodite thermoelectric material and preparation method thereof

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Embodiment 1

[0034] A kind of sulfur silver germanium ore thermoelectric material, its chemical formula is Ag 8 sn 1-x Nb x Se 6 , x=0~0.05, in the present embodiment by getting x=0, 0.01, 0.02, 0.03 and 0.05 (when x=0, chemical formula is Ag 8 SnSe 6 , when x=0.01, 0.02, 0.03 and 0.05, that is, by doping different concentrations of Nb to optimize the carrier concentration), according to the following preparation method, to obtain Ag with different carrier concentrations 8sn 1-x Nb x Se 6 Block material:

[0035] (1) According to different values ​​of x, it is composed into Ag 8 sn 1-x Nb x Se 6 Stoichiometric ratio of (x=0~0.05) Weigh elemental raw materials silver Ag, tin Sn, niobium Nb, selenium Se with a purity greater than 99.99%, place the raw materials in a quartz tube, and seal the quartz tube under vacuum.

[0036] (2) Suspend the quartz tube containing the raw material in a high-temperature muffle furnace, slowly raise the temperature to 1073-1273K at a rate of 150-30...

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Abstract

The invention relates to an argyrodite thermoelectric material, the chemical formula of which is Ag8Sn(1-x)NbxSe6, x=0-0.05. The preparation method of the argyrodite thermoelectric material is characterized by, with simple substances being raw materials, carrying out material blending according to stoichiometric ratio of the chemical formula; after vacuum packaging, melting reaction quenching and thermal treatment quenching, grinding ingots into powders; and carrying out vacuum high-temperature hot-pressure sintering, and after slow cooling, obtaining a block material, which is the argyrodite thermoelectric material. Compared with the prior art, the high-performance thermoelectric material, which is low in heat conduction and high in thermoelectric performance, is prepared, and the method for preparing the thermoelectric material, which is high in density, high in mechanical strength and high in thermoelectric performance, is explored; the thermoelectric material has very low lattice thermal conductivity (0.2-0.4 W/m.K) in a whole-temperature range; when the temperature is 900 K, thermoelectric peak of the thermoelectric material reaches 1.2; when the temperature is 300-850 K, the average thermoelectric figure of merit zTave of the thermoelectric material is infinity-0.8; and the argyrodite thermoelectric material is a potential thermoelectric material.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, in particular to a sulfur-silver-germanium ore thermoelectric material with low thermal conductivity and high performance and a preparation method thereof. Background technique [0002] Energy crisis and environmental pollution have become two major problems to be solved urgently in the world. Environmental pollution and energy crisis are becoming more and more serious, and oil and coal as the main energy supply are in jeopardy. The development and utilization of clean and renewable resources is the fundamental demand for solving energy and environmental problems. Thermoelectric energy materials, through the transport of carriers in semiconductor materials, realize the mutual conversion of heat energy and electric energy. Because of the characteristics of no noise, no pollution, and environmental friendliness, it is considered to be a kind of green and sustainable energy conversion m...

Claims

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Application Information

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