Bi2-xAg3xS3 thermoelectric material and preparation method thereof

A thermoelectric material and a general formula technology, applied in the field of ion sintering process, Bi2-xAg3xS3 thermoelectric material and its preparation, to achieve the effect of controllable particle size, short time and simple operation

Inactive Publication Date: 2010-06-23
UNIV OF SCI & TECH BEIJING
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  • Abstract
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Problems solved by technology

Bi prepared by mechanical alloying and spark plasma sintering 2-x Ag 3x S 3 Thermoelectric materials have not been reported

Method used

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  • Bi2-xAg3xS3 thermoelectric material and preparation method thereof
  • Bi2-xAg3xS3 thermoelectric material and preparation method thereof
  • Bi2-xAg3xS3 thermoelectric material and preparation method thereof

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Embodiment Construction

[0018] Bi was first prepared by mechanical alloying method 2-x Ag 3x S 3 Nano powder, the method is to use high-purity Bi, Ag and S elemental powder according to the general chemical formula Bi 2-x Ag 3x S 3 Proportioning, put them together in a planetary high-energy ball mill for mechanical alloying under the protection of an inert gas (Ar), dry-mill the synthetic compound, then wet-mill, and dry to obtain Ag-doped Bi 2 S 3 Nano-powder; powder discharge plasma sintering to obtain bulk material.

[0019] The test conditions are as follows: the value range of x is x=0.001~1.0; dry grinding under the protection of inert gas (At gas) for 1~20h, the speed is 100~600rpm; wet grinding under the atmosphere of absolute ethanol for 0.25~5h, the speed is 100 ~400rpm; SPS sintering temperature 200~600℃, mold diameter 10~30mm, pressure 20~60MPa.

[0020] Table 1 has provided the present invention (Bi 2-x Ag 3x S 3 ) of several preferred embodiments:

[0021]

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Abstract

The invention discloses a Bi2-xAg3xS3 thermoelectric material and a preparation method thereof, which belongs to the technical field of energy source materials. By the invention, the Bi2-xAg3xS3 is prepared according to the stoichiometric proportion of Bi, S and Ag, wherein x respects the mole fraction of Ag and the value range of x is more than or equal to 0.001 and less than or equal to 1. The powder simple substances of Bi element, S element and Ag element with high purity (99.99 percent) are prepared according to the stoichiometric proportion of final product, are synthesized into powder in a mechanical alloying way and sintered into block bodies by using discharge plasma. The material has the advantages that the doping of the Ag greatly reduces the resistivity of the material and a higher optimal value can be acquired while the thermal conductivity has little change. The preparation method has the advantages of simple operation, low cost, easily-obtained material, short time, controllable particle size, high density, good mechanical property, great improvement of thermoelectric properties in comparison with Bi2S3 and suitability for large-batch production.

Description

technical field [0001] The invention belongs to the technical field of energy materials, in particular to a Bi 2-x Ag 3x S 3 The thermoelectric material and its preparation method involve mechanical alloying (Mechanical Alloying, MA) and spark plasma sintering (SparkPlasma Sintering, SPS) processes. Background technique [0002] Thermoelectric material is a functional material that utilizes the movement of carriers inside a solid to achieve direct mutual conversion of thermal energy and electrical energy. Bi 2 S 3 It is an important semiconductor material with an energy band gap of 1.2-1.7eV, and has potential applications in thermoelectric, electronic and optoelectronic devices and infrared spectroscopy. The earliest study of Bi 2 S 3 The thermoelectric performance is that B.X.Chen et al. [B.X.Chen, C.Uher, Chem.Mater.9(1997) 1655.] of the University of Michigan prepared N-type Bi by vacuum smelting. 2 S 3 And K-doped K-Bi-S ternary compounds, Bi 2 S 3 The maximu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L35/16H01L35/34
Inventor 张波萍于一强葛振华尚鹏鹏陈晨陈跃星
Owner UNIV OF SCI & TECH BEIJING
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