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Method for effectively enhancing PbTe thermoelectric performance based on Ga element doping

A technology of thermoelectric performance and element doping, which is applied in the manufacture/processing of thermoelectric devices, and lead-out materials of thermoelectric device junctions, etc., can solve problems such as staying in basic research, low thermoelectric performance of PbTe matrix, and hindering commercial application, etc. Achieve the effect of less impurities, high density and high crystallinity

Active Publication Date: 2018-01-09
SICHUAN UNIV
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Problems solved by technology

However, the low thermoelectric performance of the PbTe matrix seriously hinders its commercial application, and the current domestic reports on such compounds are still in the basic research stage.

Method used

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  • Method for effectively enhancing PbTe thermoelectric performance based on Ga element doping
  • Method for effectively enhancing PbTe thermoelectric performance based on Ga element doping
  • Method for effectively enhancing PbTe thermoelectric performance based on Ga element doping

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Embodiment Construction

[0031] The specific implementation of the present invention will be described in conjunction with the examples.

[0032] (1) Weigh Pb powder, Te powder and Ga block according to the element ratio of 1:x:1-x, where the value of x is 0.01, 0.02, 0.03 respectively; then put Pb powder and Te powder in an agate mortar Mix and grind for 30 minutes to make the powder mix evenly;

[0033] (2) Transfer the ground powder into a steel mold with Φ=10mm, and use a pressure of 5MPa for 5min;

[0034] (3) Move the pressed sheet sample and Ga block into a cleaned Φ=20mm quartz tube; seal the tube with a hydrogen-oxygen generator; first use a mechanical pump to pre-vacuumize, and then use a molecular pump to evacuate to 1.5× 10 -3 Pa, sealed tube;

[0035] (4) Finally, the quartz tube with the sample is placed in a box furnace for sintering;

[0036] (5) The first sintering: After 420 minutes, the temperature was raised from room temperature to 750°C, and the temperature was kept for 720 m...

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Abstract

The invention belongs to the field of material, and relates to a method for effectively enhancing PbTe thermoelectric performance based on Ga element doping. Pb powder, Te powder and Ga blocks are weighed and taken according to the element proportion of 1:x:1-x, wherein the value of x is taken as 0.01-0.05; and the mixture is ground, mixed and compacted into a piece and then put in a quartz tube to perform vacuum pumping and tube sealing, and sintering and discharge plasma sintering are performed in turn so that the Ga-doped PbTe compound thermoelectric material can be obtained. According to the method for enhancing the PbTe thermoelectric figure of merit based on Ga element doping, the method can be used for preparation of the PbTe doped sample and enhancement of the performance so that the process operation is easy and the repeatability is high. According to the method, the phase formation degree, the compactness and the microstructure of the PbTe compound can be controlled by adjusting the temperature increasing and decreasing rate, the phase formation temperature, the thermal preservation time and other process parameters so that the controllability is high; and the prepared Gadoped PbTe compound has the characteristics of high degree of crystallization, less impurity, high compactness, low thermal conductivity and high thermoelectric performance.

Description

technical field [0001] The invention belongs to the field of thermoelectric materials, and relates to a method for effectively improving the thermoelectric performance of PbTe based on Ga element doping. Background technique [0002] Since the oil crisis, energy shortages have continuously caused various social and economic problems. People have gradually realized that relying solely on fossil fuels and oil resources is not enough to support the development of human society. In addition, the ecological crisis that has continued to erupt in recent years has exacerbated the concerns of people around the world about traditional fuels, forcing countries to continuously invest a large amount of capital to open up green, sustainable, and environmentally friendly energy sources. [0003] Thermoelectric materials can directly realize mutual conversion of heat energy and electric energy by using temperature difference. Their reliable performance, long service life, and environmental ...

Claims

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Application Information

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IPC IPC(8): H01L35/34H01L35/16
Inventor 昂然王正上陈志禹唐军
Owner SICHUAN UNIV
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