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Barium zinc antimony based p type thermoelectric material and method for making same

A thermoelectric material, antimony-based technology, applied in the direction of thermoelectric device junction lead-out materials, etc., can solve problems such as low thermal conductivity

Inactive Publication Date: 2008-02-06
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compound BaZn in the present invention 2 Sb 2 It is a typical Zintl-type compound. At present, the thermoelectric properties of this compound have not been reported. BaZn 2 Sb 2 Exhibits excellent thermoelectric properties comparable to the previous two materials: low thermal conductivity, good electrical properties

Method used

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  • Barium zinc antimony based p type thermoelectric material and method for making same
  • Barium zinc antimony based p type thermoelectric material and method for making same
  • Barium zinc antimony based p type thermoelectric material and method for making same

Examples

Experimental program
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Effect test

Embodiment 1

[0017] In the glove box, weigh 0.392g of Zn pellets (99.999%), 0.412g of Ba metal (>99%), and 0.731g of antimony pellets (99.999%), and put the raw materials into a 25mm container lined with carbon paper from bottom to top. ×Φ10mm size graphite crucible, then put this crucible into a quartz tube with an inner diameter of Φ11mm, plug it with a rubber stopper and take it out from the glove box. Then quickly evacuate it with a vacuum pump until the vacuum degree reaches 1×10 -6 When torr, it is sealed with a hydrogen-oxygen flame. Then put it into a heating furnace, raise the temperature to 800°C at a rate of 1°C / min, keep it warm for 72 hours, and take it out with the furnace cooling. The product was confirmed as BaZn by powder XRD 2 Sb 2Pure phase, Figure 5 shows the experimental and calculated XRD spectra. The obtained samples were ground into powder, and then sintered at 576° C., 50 MPa, and vacuum atmosphere for about 15 minutes by using rapid plasma sintering (SPS). Th...

Embodiment 2

[0019] Take by weighing Zn particle (99.999%) 0.651g, Cu sheet (99.999%) 0.003g, Ba metal (>99%) 0.687g, antimony particle (99.999%) 1.218g, other conditions are the same as example 1, gained powder sample passes through Powder XRD detection confirmed as BaZn 2 Sb 2 Pure phase, SPS sintering temperature is 570°C, 50MPa, sintering in vacuum atmosphere for about 15 minutes. The density of the obtained ceramic sample is about 90%. Then the thermal conductance, electrical conductivity, Seebeck coefficient and thermoelectric figure of merit (ZT value) of the sample in the range of 300K-700K are tested. Figures 1, 2, 3, and 4 show the results, respectively.

Embodiment 3

[0021] Take by weighing Zn particle (99.999%) 0.777g, Ag (99.999%) 0.013g, Ba metal (>99%) 0.824g, antimony particle (99.999%) 1.461g, other conditions are the same as example 1, gained powder sample passes through powder XRD detection confirmed as BaZn 2 Sb 2 Pure phase, SPS sintering temperature 590°C, 50MPa, sintering in vacuum atmosphere for about 15 minutes. The density of the obtained ceramic sample is about 90%. Then the thermal conductance, electrical conductivity, Seebeck coefficient and thermoelectric figure of merit (ZT value) of the sample in the range of 300K-700K are tested. Figures 1, 2, 3, and 4 show the results, respectively.

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Abstract

The present invention relates to a barium stibium and zinc based p type thermoelectric material and the preparing method and belongs to the thermoelectric conversion material domain. The chemical general expression of the present invention is Bal-uRuZn2-vTvSb2-zSz, wherein the R element is Ca, Sr, Yb or Eu and X is the R with impurity with an arrange X which is no less than zero and no more than zero point two; the T element is Cu or Ag and y is T with impurity with an arrange y which is no less than zero and no more than zero point two; S is element Ge or Sn and z is S with impurity with an arrange z which is no less than zero and no more than zero point two. The present invention is compounded under the vacuum or inertia gas and the present invention adopts the quick plasma sinter(SPS) or the method of heat pressure sinter porcelain sample. The ZT value of barium stibium and zinc can reach zero point thirty eight and will be enhanced after adding impurity; and the present invention can be applicable to the thermoelectricity conversion generating or the refrigeration.

Description

technical field [0001] The invention relates to a barium-zinc-antimony-based p-type thermoelectric material and a preparation method thereof, belonging to the field of thermoelectric conversion materials. Background technique [0002] Thermoelectric conversion technology is a technology that uses the Seebeck effect and Peltier effect of semiconductor materials to directly convert heat and electricity, including thermoelectric power generation and thermoelectric refrigeration. [1-2] . The thermoelectric conversion system has the advantages of small size, high reliability, no pollution, no noise, wide applicable temperature range, etc. As a special power supply and high-precision temperature control device, it has been widely used in high-tech fields such as space technology, military equipment, and IT technology. application. The thermoelectric conversion efficiency of the system mainly depends on the performance of the thermoelectric material, that is, the dimensionless pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L35/18C22C30/00C22C1/04H10N10/853
Inventor 王小军赵景泰陈昊鸿杨昕昕
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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