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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

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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, for relatively lower-cost thermoelectric materials such as CoSbS, because its own crystal system is not cubic, it is not possible to obtain high-symmetry cubic thermoelectric materials by using the usual preparation methods.

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

Examples

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Embodiment 1

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

[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 above five steps will be described in detail below.

[0049] 1) Ingredients step

[0050] Co, Sb, and S are used as raw materials, mixed with the molar ratio of CoSbS molecular formula, and placed in a stainless steel ball mill jar. Preferably, the raw materials are Co powder, Sb powder and S powder with a purity ≥ 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 possibility of more CoSbS-based thermoelectric materials, Ni, Se, Te or Fe can be added to the ...

Embodiment 2

[0062] In this example, the thermoelectric material Ni x co 1-x SbS (x=0-0.15).

[0063] In the preparation of thermoelectric materials Ni x co 1-x In the process of SbS, the inventor 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. Wherein the sintering pressure is 1-3GPa. After the sintered samples were tested by X-ray diffraction, it was found that all samples were orthogonal structures under 1GPa conditions (such as figure 2 ), the sample transforms into a cubic structure after doping 5% Ni under the condition of 2GPa (such as image 3 ), that is, Ni doping can reduce the structural transition pressure of CoSbS.

[0064] In order to characterize the properties of samples with different structures, the Ni-doped samples synthesized at 1GPa and 3GPa were cut and polished, and the resistivity, Seebeck coefficient and thermal conductivity of the samples were tested by LSR-...

Embodiment 3

[0068] In this example, the preparation of thermoelectric material Fe x co 1-x SbS (x=0-0.1).

[0069] In the preparation of thermoelectric materials Fe x co 1-x In the process of SbS, the inventor 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 2GPa. Figure 6 For the X-ray diffraction pattern of the sample, it is found that the Fe-doped CoSbS sample is still an orthorhombic structure, that is, Fe doping cannot reduce the crystal structure transition pressure of CoSbS as Ni does. Since Fe doping does not improve the symmetry of the crystal structure of CoSbS, and provides 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] Similarly, applicants u...

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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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