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A method for rapid preparation of single-phase bi2s3 thermoelectric compounds

A compound and single-phase technology, which is applied in the direction of bismuth compounds, chemical instruments and methods, thermoelectric device junction lead-out materials, etc., can solve the problems of serious S volatilization, sample performance repeatability, etc., and achieve fast reaction speed and low cost , the effect of simple equipment

Active Publication Date: 2015-09-30
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the low melting point of S (115°C), S volatilizes severely during the long-term reaction process, which has a great impact on the repeatability of sample performance

Method used

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  • A method for rapid preparation of single-phase bi2s3 thermoelectric compounds
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  • A method for rapid preparation of single-phase bi2s3 thermoelectric compounds

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Embodiment 1

[0026] Rapid preparation of single-phase Bi 2 S 3 A method for thermoelectric compounds comprising the steps of:

[0027] 1) Prepare Bi powder and S powder as raw materials according to the stoichiometric ratio Bi:S=2:3.06 (relative to the compound Bi 2 S 3 For the stoichiometric ratio, the raw material sulfur powder is in excess of 2%), and then they are ground and mixed uniformly to obtain the reactant, which is pressed into a 10mm cylindrical block with a total mass of 4.3g;

[0028] 2 Put the block reactant in step 1) in a glass tube to heat the end of the block in an air atmosphere, and perform local detonation to initiate a self-propagating reaction. After the reaction is completed, it is naturally cooled to obtain a single-phase Bi 2 S 3 thermoelectric compound.

[0029] Figure 1 (a) and (b) are the XRD pattern and SEM pattern of the self-propagating reaction powder obtained in step 3) in Example 1, respectively (magnified by 5.00 k times and 10.00 k times from lef...

Embodiment 2

[0031] Rapid preparation of single-phase Bi 2 S 3 A method for thermoelectric compounds comprising the steps of:

[0032] 1) Prepare Bi powder and S powder as raw materials according to the stoichiometric ratio Bi:S=2:3.06, then grind and mix them evenly to obtain reactants, and press them into 10mm cylindrical blocks with a total mass of 4.3g;

[0033] 2. Vacuum-seal the block reactant in step 1) in a glass tube, and place it in a constant temperature furnace for overall heating to promote a thermal explosion reaction. The furnace temperature and reaction time are respectively: 500°C, 2min, and naturally cool after the reaction is completed. get single-phase Bi 2 S 3 thermoelectric compound.

[0034] Figure 2 (a) and (b) are the XRD pattern and SEM pattern of the powder after thermal explosion reaction obtained in step 3) in Example 2, respectively (magnified by 5.00 k times and 10.00 k times from left to right, respectively). It can be seen from Figure 2 that the obtain...

Embodiment 3

[0036] Rapid preparation of single-phase Bi 2 S 3 A method for thermoelectric compounds comprising the steps of:

[0037] 1) Prepare Bi powder and S powder as raw materials according to the stoichiometric ratio Bi:S=2:3.06, then grind and mix them evenly to obtain reactants, and press them into 10mm cylindrical blocks with a total mass of 4.3g;

[0038] 2. Vacuum-seal the block reactant in step 1) in a glass tube, and place it in a constant temperature furnace for overall heating to promote a thermal explosion reaction. The furnace temperature and reaction time are respectively: 500°C, 3min, and naturally cool after the reaction is completed. get single-phase Bi 2 S 3 thermoelectric compound.

[0039] Figure 3(a) and (b) are the XRD pattern and SEM pattern of the powder after the thermal explosion reaction obtained in step 3) of Example 3, respectively (magnified by 5.00 k times and 10.00 k times from left to right, respectively). It can be seen from Figure 3 that the obt...

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Abstract

The present invention relates to a method for rapidly preparing single-phase Bi2S3 thermoelectric compounds, which comprises the following steps: 1) preparing Bi powder and S powder as raw materials according to the stoichiometric ratio Bi:S=2:3.06, relative to the stoichiometric ratio of the compound Bi2S3 For example, the excess of raw sulfur powder is 2%, and then they are ground and mixed uniformly to obtain the reactant; 2) The reactant in step 1) is induced to self-propagating reaction or thermal explosion reaction, and after the reaction is completed, it is naturally cooled to obtain a single-phase Bi2S3 thermoelectric compound. The invention has the advantages of fast response speed, simple equipment, good repeatability, high efficiency and energy saving, and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy materials, in particular to the rapid preparation of Bi 2 S 3 method for thermoelectric compounds. Background technique [0002] The destruction of the global natural environment and the consumption of non-renewable fossil energy in various countries have sounded a heavy alarm for the world. The proposal of the sustainable development strategy is undoubtedly a forward-looking achievement that complies with the current real development needs. In order to reduce the burden of environmental damage and energy consumption, many scientists around the world are focusing their attention on finding and developing renewable new energy sources. [0003] Thermoelectric conversion technology can realize the direct mutual conversion between electric energy and thermal energy through the Seebeck effect and Peltier effect of thermoelectric materials. As an environmentally friendly energy conv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L35/16C01G29/00
Inventor 唐新峰张强
Owner WUHAN UNIV OF TECH
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