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Pyroelectric material with quadruple skutterudite structure and preparation method thereof

A kind of thermoelectric material, Yuanfang technology, applied in the direction of thermoelectric device junction lead wire material, etc., to achieve the effect of simple equipment, improving thermoelectric figure of merit, and reducing thermal conductivity

Inactive Publication Date: 2009-01-21
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method of single doping only at Co or Sb sites makes CoSb 3 The ZT value can only reach about 0.5

Method used

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  • Pyroelectric material with quadruple skutterudite structure and preparation method thereof
  • Pyroelectric material with quadruple skutterudite structure and preparation method thereof
  • Pyroelectric material with quadruple skutterudite structure and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1: with cobalt (Co) powder, antimony (Sb) powder, tellurium (Te) powder, germanium (Ge) powder is raw material according to CoSb 3+δ-x-y x x Y y (X=Te, Y=Ge; δ=0.06, x=0.12, y=0.02), ie CoSb 2.92 Te 0.12 Ge 0.02The metering ratio of weighing a total amount of powder is 20g, put it into a stainless steel tank (volume 250ml), and add stainless steel balls with a diameter of 6-20mm (the weight ratio of grinding balls and powder is 25:1). The ball mill jar was filled with Ar gas as a protective gas, and then the ball mill jar was installed in a planetary ball mill (QM-2, Nanjing University Instrument Factory), and ball milled at a speed of 450 rpm for 6 hours to obtain a fine powder. Take out the ball-milled powder, put it into a graphite mold, and then put it into a spark plasma sintering equipment for sintering. The sintering temperature is 600° C., the holding time is 5 minutes, the sintering pressure is 30 MPa, and the heating rate is 100° C. / min. figur...

Embodiment 2

[0029] Embodiment 2: with cobalt (Co) powder, antimony (Sb) powder, selenium (Se) powder, tin (Sn) powder is raw material according to CoSb 3+δ-x-y x x Y y The metering ratio of (X=Se, Y=Sn; δ=0.1, x=0.001, y=0.001) weighs a total amount of 20g powder, and its MA-SPS process is the same as in Example 1. The thermoelectric performance test results show that the compound is n-type with a power factor of 500μWm -1 K -2 .

Embodiment 3

[0030] Embodiment 3: with cobalt (Co) powder, antimony (Sb) powder, tellurium (Te) powder, tin (Sn) powder is raw material according to CoSb 3+δ-x-y x x Y y (X=Te, Y=Sn; δ=0, x=0.125, y=0.125), namely CoSb 2.75 Te 0.125 sn 0.125 The metering ratio weighs a total amount of powder that is 20g. Then put the powder into a stainless steel jar (volume 250ml), and add stainless steel balls with a diameter of 6-20mm (the weight ratio of grinding balls and powder is 25:1). The ball milling jar was filled with Ar gas as a protective gas, and then the ball milling jar was installed in a planetary ball mill (QM-2, Nanjing University Instrument Factory), and ball milled at a speed of 450 rpm for 15 hours to obtain a fine powder. Take out the ball-milled powder, put it into a graphite mold, and then put it into a spark plasma sintering equipment for sintering. The sintering temperature is 500° C., the holding time is 5 minutes, the sintering pressure is 50 MPa, and the heating rate is...

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Abstract

A pyroelectric material of a quaternary skutterudite structure and a method for preparing the material, the chemical formula of the material is that CoSb3+delta-x-yXxYy, wherein the X is Se or Te, the Y is Ge or Sn, the delta is Sb compensation, and the x and the y are respectively the doping quantity of the X and the Y. The material is characterized by simultaneously doping IVB group and VIB group elements into CoSb3, and the material utilizes the charge compensation between the IVB group and the VIB group elements to increase the whole doping concentration, and introduces more point defect scatterings to reduce the heat conductivity. Under a proper condition, a CoX1.5Y1.5 phase can be separated from a Co-Sb-X-Y basal body and 'nanometer points' can be formed, and the additional scattering action can be generated to the phonon transport. The invention adopts the method of combining the mechanical alloying and the spark discharging plasma sintering, and prepares Co-Sb-X-Y quaternary materials with high pyroelectricity, and the non-dimensional value ZT of the material can reach 1.1 at 550 DEG C.

Description

technical field [0001] The invention belongs to the field of new energy materials, and in particular relates to a Co-Sb-X-Y (X=Se, Te; Y=Ge, Sn) thermoelectric material with high thermoelectric merit and a preparation method thereof. Background technique [0002] In recent years, energy issues and environmental issues have attracted increasing attention. Most of the energy used in industrial production, transportation, and residential life is in the form of heat, but the existing energy utilization efficiency is only 30-35%, which means that most of the energy is released in the form of waste heat up. Thermoelectric power generation devices based on the Seebeck effect are well suited for the reuse of these massive, low-grade, dispersed waste heat sources. Therefore, the development of a high thermoelectric figure of merit ZT (ZT = Tα 2 / ρλ, where T is the temperature, a is the Seebeck coefficient, ρ is the electrical resistivity, and λ is the thermal conductivity), medium...

Claims

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Application Information

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IPC IPC(8): H01L35/16C22C1/05B22F3/105
Inventor 李敬锋刘玮书张波萍赵立东
Owner TSINGHUA UNIV
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