Preparation method of cubic structure CoSbS thermoelectric compound

A cubic structure and compound technology, which is applied in the field of preparation of CoSbS-based thermoelectric materials, can solve the problems of high overall cost, inability to obtain high symmetry cubic structure thermoelectric materials, high cost of Sb single substance, etc., and achieve cheap constituent elements and crystal structure symmetry Controllable, short material cycle results

Inactive Publication Date: 2019-04-16
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CoSb 3 The high symmetry is determined by its molecular structure, and its crystal system itself has high symmetry, but the cost of Sb is very high, resulting in the corresponding CoSb 3 overall high cost
However, f

Method used

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  • Preparation method of cubic structure CoSbS thermoelectric compound
  • Preparation method of cubic structure CoSbS thermoelectric compound
  • Preparation method of cubic structure CoSbS thermoelectric compound

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Example Embodiment

[0045] Example 1

[0046] In this embodiment, taking the process of preparing CoSbS as an example, the preparation method of the thermoelectric material of the present invention is described in detail.

[0047] Such as figure 1 As shown, the method includes the following steps: 1) batching step; 2) wet ball milling step; 3) drying step; 4) pressing step; 5) sintering step.

[0048] The five steps above will be described in detail below.

[0049] 1) Ingredient steps

[0050] Take Co, Sb, and S as raw materials, mix them in the molar ratio of the molecular formula of CoSbS, and place them in a stainless steel ball mill tank. Preferably, the raw materials are Co powder, Sb powder and S powder with a purity of ≥99.5%; the raw materials are weighed according to the CoSbS stoichiometric ratio, and the total weight is 5g. The ball to material ratio can be set to 20:1.

[0051] Preferably, in order to increase the possibilities of the CoSbS-based thermoelectric material, Ni, Se, Te or Fe can b...

Example Embodiment

[0061] Example 2

[0062] In this embodiment, the thermoelectric material Ni is prepared x Co 1-x SbS (x=0-0.15).

[0063] In the preparation of thermoelectric material Ni x Co 1-x In the SbS process, the inventors adopted steps similar to those in Example 1, namely 1) batching step; 2) wet ball milling step; 3) drying step; 4) pressing step; 5) sintering step. The sintering pressure is 1~3GPa. The sintered samples have been tested by X-ray diffraction, and it is found that all samples have an orthogonal structure under 1GPa conditions (such as figure 2 ), the sample changes into a cubic structure after doping with 5% Ni under 2GPa conditions (such as image 3 ), that is, Ni doping can reduce the structural transition pressure of CoSbS.

[0064] In order to characterize the performance of samples with different structures, Ni-doped samples synthesized from 1 GPa and 3 GPa were cut and polished, and the resistivity, Seebeck coefficient and thermal conductivity of the samples were te...

Example Embodiment

[0067] Example 3

[0068] In this embodiment, the thermoelectric material Fe is prepared x Co 1-x SbS (x=0-0.1).

[0069] In the preparation of thermoelectric material Fe x Co 1-x In the SbS process, the inventors adopted steps similar to those in Example 1, namely 1) batching step; 2) wet ball milling step; 3) drying step; 4) pressing step; 5) sintering step.

[0070] In this embodiment, the sintering pressure is 2 GPa. Image 6 For the X-ray diffraction pattern of the sample, it is found that the Fe-doped CoSbS sample still has an orthogonal structure, that is, Fe doping cannot reduce the crystal structure transition pressure of CoSbS like Ni. Because Fe doping does not improve the symmetry of the crystal structure of CoSbS, and at the same time, to provide more electrons to the CoSbS compound, the resistivity of the sample increases and the thermoelectric performance decreases (the power factor of Fe doped CoSbS at room temperature is only 5×10 -5 μWcm -1 K -2 ).

[0071] Simil...

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Abstract

The invention provides a preparation method of a cubic structure CoSbS thermoelectric compound. The method comprises the steps that 1), raw materials are placed in a ball milling jar, the raw materials comprise Co powder, Sb powder and S powder which are mixed according a certain mole ratio; 2), wet process ball milling; 3), products obtained after wet-process ball milling is conducted are dried to obtain a dried powder precursor; 4), the obtained powder precursor is pressed into a block; 5), high-pressure synthesis is conducted on the pressed block to obtain the cubic structure CoSbS compound, wherein the high-pressure synthesis in step 5) is conducted on a high-temperature high-pressure device, the synthesis process comprises the steps that a block sample is wrapped with a boron nitrideinsulation tube and put into a pyrophyllite synthesis block to be synthesized under high pressure, and the adopted synthesis pressure is greater than 2 GPa. The method has the advantages that the cubic structure CoSbS thermoelectric compound can be effectively obtained, the technology is simple, and the cycle is short.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional materials, in particular, the invention relates to the field of high-pressure synthesis technology, especially the preparation method of a CoSbS-based thermoelectric material with a cubic structure. Background technique [0002] In recent years, the traditional fossil energy represented by oil has become increasingly exhausted and its price has been rising. At the same time, the extensive use of fossil energy has led to the deterioration of the environment. Energy and environmental issues force people to pay more and more attention to new energy and energy conversion materials. Thermoelectric material is a functional material that can realize direct conversion of heat energy and electric energy. It can be used as a thermoelectric generator, so as to effectively utilize a large amount of waste heat and waste heat in industry. Thermoelectric devices do not have any mechanical mov...

Claims

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Application Information

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IPC IPC(8): C01G51/00C01G53/00C01B19/00
CPCC01B19/002C01G51/006C01G53/006C01P2002/72
Inventor 朱红玉宿太超胡强胡美华李尚升贺春元杜保立杨曼曼杜景阳
Owner HENAN POLYTECHNIC UNIV
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