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Medium and low temperature p-type multi element pyroelectric alloy possessing high thermoelectric figure of merit (ZT)

A high-heat, multi-component technology, applied in the field of new materials, to achieve the effect of simple process, high thermoelectric performance and low cost

Inactive Publication Date: 2006-01-11
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some literatures report that its thermoelectric figure of merit ZT value can reach 1.22, but the material is prepared by zone melting method.

Method used

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  • Medium and low temperature p-type multi element pyroelectric alloy possessing high thermoelectric figure of merit (ZT)
  • Medium and low temperature p-type multi element pyroelectric alloy possessing high thermoelectric figure of merit (ZT)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] According to Bi 0.5 Sb 1.5 Te 3 The three elements of Bi, Sb and Te with a purity greater than 99.999wt% are weighed by the molecular formula and placed in a vacuum quartz tube, melted at a temperature of 1000° C. and maintained for 10 hours. Shake the tube every 1 hour during the melt to ensure a uniform reaction. After 10 hours, it was quenched in water to obtain a bulk metal telluride, which was then pulverized and ball milled. The ball milling time was controlled at 5 hours, and finally formed by discharge plasma spark sintering (SPS) under high vacuum.

Embodiment 2

[0022] In the pseudo binary alloy Bi 0.5 Sb 1.5 Te 3 The Cu element with a mole fraction of 0.05 is used to replace the Sb element with an equal mole fraction. According to the molecular formula Cu 0.05 Bi 0.5 Sb 1.45 Te 3 Weigh Cu, Bi, Sb and Te three elements with a purity greater than 99.999wt% and place them in a vacuum quartz tube, melt at 1000°C and keep for 10 hours. Shake the tube every 1 hour during the melt to ensure a uniform reaction. After 10 hours, it was quenched in water to obtain a block of quaternary metal telluride, which was then pulverized and ball milled. The ball milling time was controlled at 5 hours, and finally formed by discharge plasma spark sintering (SPS) under high vacuum.

Embodiment 3

[0024] In the pseudo binary alloy Bi 0.5 Sb 1.5 Te 3 The Cu element with a mole fraction of 0.1 is used to replace the Sb element with an equal mole fraction. According to the molecular formula Cu 0.1 Bi 0.5 Sb 1.4 Te 3 Weigh Cu, Bi, Sb and Te three elements with a purity greater than 99.999wt% and place them in a vacuum quartz tube, melt at 1000°C and keep for 10 hours. Shake the tube every 1 hour during the melt to ensure a uniform reaction. After 10 hours, it was quenched in water to obtain a block of quaternary metal telluride, which was then pulverized and ball milled. The ball milling time was controlled at 5 hours, and finally formed by discharge plasma spark sintering (SPS) under high vacuum.

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Abstract

A medium-and low-temp multi-element P-type thermoelectric alloy with high ZT value is a CuxBi0.5 Sb1-xTe3 alloy. Its thermoelectric property is improved through designing the components of the basic Bi-Te material and discharge plasma spark sintering. It features that part of Sb is replaced by Cu. Its advantages are high reliability and thermoelectric properties, long service life and no pollution and noise.

Description

technical field [0001] The invention relates to the field of new materials, and is a material for main components of refrigeration or power generation devices used for direct mutual conversion of heat energy and electric energy, especially for key materials for medium and low temperature refrigeration or power generation. Background technique [0002] Thermoelectric material is a new type of semiconductor functional material that realizes direct mutual conversion of electric energy and thermal energy through the movement of carriers, including electrons or holes. The performance of thermoelectric materials is closely related to temperature. So far, the highest thermoelectric figure of merit (ZT) of the homogeneous thermoelectric materials discovered so far only achieves the maximum value at a certain temperature value. The comprehensive performance of thermoelectric materials is determined by the dimensionless figure of merit ZT=Tσα 2 / κ description, where α is the Seebeck ...

Claims

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Application Information

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IPC IPC(8): C22C29/00C22C1/00C22C1/04B22F3/105
Inventor 崔教林
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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