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SnTe-based high-performance thermoelectric material and preparation method thereof

A thermoelectric material and high-performance technology, applied in the direction of thermoelectric device junction lead-out material, thermoelectric device manufacturing/processing, etc., can solve the problems of thermoelectric performance research, existing space, etc., to achieve the effect of energy band convergence

Active Publication Date: 2018-08-24
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Studies have shown (C.Z.Li W, Lin S, et al., Journal of Materiomics, 2015, DOI: 10.1016 / j.jmat.2015.09.001, 307-315.), SnTe solid solution manganese telluride (MnTe) can effectively adjust SnTe Band structure, but due to the limitation of MnTe solid solubility (no more than 15%), there is still room for research on thermoelectric properties of higher concentration MnTe material systems in SnTe

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  • SnTe-based high-performance thermoelectric material and preparation method thereof
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  • SnTe-based high-performance thermoelectric material and preparation method thereof

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preparation example Construction

[0044] In one embodiment of the present invention, the preparation method of the above-mentioned SnTe-based high-performance thermoelectric material comprises the following steps:

[0045] (1) Vacuum packaging: Weigh the elemental raw materials Sn, Te, Mn and Ge according to the stoichiometric ratio, mix them evenly, and vacuum-pack them in a quartz tube;

[0046] (2) Melting quenching: heating the quartz tube in step (1), so that the raw materials fully react in a molten state, and quenching to obtain the first ingot;

[0047] (3) Annealing and quenching: reheating the first ingot, performing high-temperature annealing, and then quenching to obtain the second ingot;

[0048] (4): Hot-press sintering: Grinding the second ingot into powder, vacuum hot-press sintering, and cooling to obtain the SnTe-based high-performance thermoelectric material.

[0049] In a preferred embodiment, the process control of the heating and melting reaction in step (2) is as follows: the temperatur...

Embodiment 1

[0055] A high-performance SnTe-based thermoelectric material whose chemical formula is Sn 1-x-y+δ mn x Ge y Te (x=0.2~0.3, y=0.05~0.25, δ=0.03~0.08), in this embodiment, by taking δ=0, y=0.05 and x=0.2, 0.25, 0.3, according to the following preparation method, get Sn with different Mn concentrations 0.95-x mn x Ge 0.05 Te bulk material, the preparation method is as follows:

[0056] (1) Vacuum packaging: according to the stoichiometric ratio, weigh the elemental Sn, Te, Mn, Ge, as raw materials according to the chemical formula Sn 1-x-y+δ mn x Ge y After the Te is mixed evenly, it is vacuum-packed in a carbon-coated quartz tube;

[0057] (2) Melting quenching: heating the quartz tube with the raw material at a rate of 200K / h, heating from room temperature to 1273K, and keeping it warm for 4 hours to fully react the raw material in a molten state, and then quenching to obtain the first ingot;

[0058] (3) Annealing and quenching: reheating the ingot obtained in step (2...

Embodiment 2

[0064] A high-performance SnTe-based thermoelectric material whose chemical formula is Sn 1-x-y+δ mn x Ge y Te (x=0.2~0.3, y=0.05~0.25, δ=0.03~0.08), in the present embodiment by taking x=0.2, y=0.05 and δ=0.03, 0.04, 0.05, 0.06, 0.07, 0.08 according to the following According to the above preparation method, Sn with different carrier concentration concentration can be obtained 0.75+δ mn 0.2 Ge 0.05 Te bulk material, the preparation method is as follows:

[0065] (1) Vacuum packaging: according to the stoichiometric ratio, weigh the elemental Sn, Te, Mn, Ge, as raw materials according to the chemical formula Sn 1-x-y+δ mn x Ge y After the Te is mixed evenly, it is vacuum-packed in a carbon-coated quartz tube;

[0066] (2) Melting quenching: heating the quartz tube with the raw material at a rate of 200K / h, heating from room temperature to 1273K, and keeping it warm for 4 hours to fully react the raw material in a molten state, and then quenching to obtain the first ing...

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Abstract

The invention relates to a SnTe-based high-performance thermoelectric material and a preparation method thereof. The chemical formula of the thermoelectric material is Sn<1-x-y+Delta>Mn<x>Ge<y>Te, wherein x is equal to 0.2-0.3, y is equal to 0.05-0.25, and delta is equal to 0.03-0.08. The SnTe-based high-performance thermoelectric material is obtained by taking high-purity metal element as a raw material, preparing materials according to a stoichiometric ratio of the chemical formula, performing vacuum packaging, melting reaction quenching and thermal processing quenching, grinding to powder,performing vacuum high-temperature hot-press sintering and slowly cooling. Compared with the prior art, a few amount of GeTe material is subjected to solid solution, the solid solution degree of MnTein a SnTe material is improved, so that the structure is optimal, the high-performance SnTe-based thermoelectric material is obtained, and a new research direction and a guidance idea are provided forperformance optimization of the thermoelectric material.

Description

technical field [0001] The invention relates to the technical field of new energy materials, in particular to a SnTe-based high-performance thermoelectric material and a preparation method thereof. Background technique [0002] The development of human society is inseparable from the emergence of high-quality energy. In today's society, energy and the environment have become issues of common concern to mankind. The two oil crises triggered discussions on energy issues and people's attention to new energy sources. Thermoelectric materials, based on the theoretical basis of the Seebeck effect and the Peltier effect, realize the conversion of thermal energy and electrical energy through the movement of internal carriers without causing environmental pollution. It has outstanding advantages such as small mass, light weight, no noise, and heat energy can be recovered and converted into electrical energy. It is considered as a kind of green and sustainable energy conversion mater...

Claims

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Application Information

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IPC IPC(8): H01L35/16H01L35/34
CPCH10N10/852H10N10/01
Inventor 裴艳中李文唐婧
Owner TONGJI UNIV
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