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Preparation of lead telluride base block thermoelectric material

A thermoelectric material, lead telluride-based technology, applied in chemical instruments and methods, selenium/tellurium compounds, inorganic chemistry, etc., can solve problems not involved in obtaining densified bulk thermoelectric materials, achieve good thermoelectric performance and cheap raw materials Easy to obtain, simple process effect

Inactive Publication Date: 2009-07-22
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses tellurium powder as a tellurium source, and there are often redundant tellurium impurities in the synthetic product; and this method only proposes AgPb m SbT m+2 Synthetic process of nanopowders, not involving methods of obtaining densified bulk thermoelectric materials

Method used

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  • Preparation of lead telluride base block thermoelectric material
  • Preparation of lead telluride base block thermoelectric material
  • Preparation of lead telluride base block thermoelectric material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of AgPb n-2 SbT n(n=∞) thermoelectric material, namely PbTe

[0035] (1) Weigh 1.483 grams of lead nitrate and 0.993 grams of sodium tellurite respectively, add them in turn to a beaker filled with about 50 ml of deionized water, and keep stirring to fully mix the reactants; then add 4.8 grams of hydroxide Potassium, after it is completely dissolved, add 1.449 grams of reducing agent potassium borohydride, and continue to stir for about 10 minutes;

[0036] (2) Transfer the above-mentioned reactants to a 100ml polytetrafluoroethylene reaction vessel, add deionized water to make it reach 80-90% of the reaction vessel volume, then place the reaction vessel in an autoclave to seal;

[0037] (3) Place the above-mentioned autoclave in an oven, heat it to 180°C at a rate of 5-10°C / min and keep it warm for 20 hours, then naturally cool to room temperature;

[0038] (4) The product obtained from the reaction was separated by centrifugation, washed with deionized ...

Embodiment 2

[0042] Preparation of AgPb n-2 SbT n (n=20) thermoelectric material, namely AgPb 18 SbT 20

[0043] (1) Weigh silver nitrate, lead nitrate, antimony chloride, and sodium tellurite to be 0.039 g, 1.373 g, 0.053 g, and 1.020 g, respectively, and add them in turn to a beaker filled with about 50 ml of deionized water, and keep stirring to make The reactants were fully mixed; then 4.8 grams of potassium hydroxide was added thereto, and 1.491 grams of reducing agent potassium borohydride was added after it was completely dissolved, and continued to stir for about 10 minutes;

[0044] (2) Transfer the above-mentioned reactants to a 100ml polytetrafluoroethylene reaction vessel, add deionized water to make it reach 80-90% of the reaction vessel volume, then place the reaction vessel in an autoclave to seal;

[0045] (3) Place the above-mentioned autoclave in an oven, heat it to 180°C at a rate of 5-10°C / min and keep it warm for 20 hours, then naturally cool to room temperature; ...

Embodiment 3

[0050] Preparation of AgPb n-2 SbT n (n=16) thermoelectric material, namely AgPb 14 SbT 16

[0051] (1) Weigh silver nitrate, lead nitrate, antimony chloride, and tellurium dioxide to be 0.049 grams, 1.344 grams, 0.066 grams, and 0.740 grams respectively, and add them successively to a beaker containing about 50 ml of deionized water, and keep stirring to make the reaction Then add 4.8 grams of Potassium Hydroxide therein, and then add 1.5 grams of reducing agent Potassium Borohydride after it dissolves completely, and keep stirring for about 10 minutes;

[0052] (2) Transfer the above-mentioned reactants to a 100ml polytetrafluoroethylene reaction vessel, add deionized water to make it reach 80-90% of the reaction vessel volume, then place the reaction vessel in an autoclave to seal;

[0053] (3) Place the above-mentioned autoclave in an oven, heat it to 180°C at a rate of 5-10°C / min and keep it warm for 20 hours, then naturally cool to room temperature;

[0054] (4) The...

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Abstract

The invention relates to a method for preparing block thermoelectric material of lead telluride base. Relevant salts are taken as raw materials, PbTe thermoelectric material containing Ag, Sb and Se is prepared by adopting a hydrothermal method combined with the technique of vacuum melting; the thermoelectric material refers to Ag1-xPbn-2SbTen-ySey, wherein, n is equal to or more than 12, x is equal to or more than 0 and less than 1 and y is equal to or more than 0 and equal to or less than 0.1n. The preparation method is as follows: firstly, a silver soluble salt, a lead soluble salt, a compound containing antimony, a compound containing tellurium, and selenium powder are taken as raw materials, alkali metal borohydride or diamide is taken as a reducing agent, the raw materials react at the temperature of 150 DEG C to 200 DEG C for 20 hours to 40 hours by adopting the hydrothermal method and lead telluride powder with impurities is prepared. Then, the obtained powder is put into a graphite crucible and sealed in a quartz glass tube under vacuum. The well-sealed glass tube is put into a resistance furnace with the temperature rising to 900 DEG C to 1000 DEG C, the heat is preserved for hours, then the temperature slowly drops to 450 DEG C which is kept for hours, and then the glass tube is cooled down to room temperature so as to obtain the compact block thermoelectric material. The preparation method of block thermoelectric material of telluride lead base is simple and economical and the prepared block thermoelectric material shows certain orientation and has fairly good thermoelectric property.

Description

technical field [0001] The invention belongs to the field of thermoelectric materials, and relates to a lead telluride-based bulk thermoelectric material and a preparation method thereof. Background technique [0002] A thermoelectric material is a material that converts thermal energy to electrical energy through the transport of its own carriers (holes or electrons) in a solid state. The performance of thermoelectric materials is usually expressed by the dimensionless thermoelectric figure of merit ZT, ZT=α 2 σT / κ, where α, σ, T and κ are Seebeck coefficient, electrical conductivity, absolute temperature and thermal conductivity, respectively, α 2 σ is called the power factor and reflects the electrical transport performance of the material. The larger the ZT value, the better the thermoelectric performance of the material. A good thermoelectric material usually has a large Seebeck coefficient and electrical conductivity, while having a small thermal conductivity. Diff...

Claims

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Application Information

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IPC IPC(8): C01B19/00
Inventor 蔡克峰李晖
Owner TONGJI UNIV
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