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Method for preparing thermoelectric material with P-type nano-structure and bismuth telluride matrix

A technology of thermoelectric materials and nanostructures, applied in the manufacture/processing of thermoelectric devices, etc., to achieve the effect of increasing phonon scattering, fine structure, and uniform composition

Inactive Publication Date: 2012-09-26
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] From the present study, the preparation of P-type Bi 0.5 Sb 1.5 Te 3 Thermoelectric materials have not been reported

Method used

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  • Method for preparing thermoelectric material with P-type nano-structure and bismuth telluride matrix
  • Method for preparing thermoelectric material with P-type nano-structure and bismuth telluride matrix
  • Method for preparing thermoelectric material with P-type nano-structure and bismuth telluride matrix

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Experimental program
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Effect test

Embodiment 1

[0035] (Preparation of hot-pressed sintered samples with a hot-pressing temperature of 400°C, a pressure of 100 MPa, and a holding time of 2 hours)

[0036] (1) The high-purity Bi, Sb, Te elemental powders are batched according to the atomic ratio of Bi: Sb: Te=0.5: 1.5: 3, the mixed powder is packed into a ball mill jar, and the purity of 99.7% alcohol is added as a ball mill medium, and the batching , canning and sampling were all carried out in a vacuum glove box. Ball milling is completed on a high-energy ball mill, using stainless steel ball milling tanks and balls. In order to prevent powder oxidation during the MA process, inert gas argon is introduced for protection. The ratio of balls to materials is 20:1, and the amount of alcohol added is such that the powder is not covered It is suitable to grind the balls, the ball milling speed is 450rpm, the ball milling time is 60h, and the fully alloyed Bi 0.5 Sb 1.5 Te 3 powder( figure 1 ), and its grain size can reach tens...

Embodiment 2

[0042] (Preparation of hot-pressed sintered samples with a hot-pressing temperature of 500°C, a pressure of 100 MPa, and a holding time of 2 hours)

[0043] (1) The high-purity Bi, Sb, Te elemental powders are batched according to the atomic ratio of Bi: Sb: Te=0.5: 1.5: 3, the mixed powder is packed into a ball mill jar, and the purity of 99.7% alcohol is added as a ball mill medium, and the batching , canning and sampling were all carried out in a vacuum glove box. Ball milling is completed on a high-energy ball mill, using stainless steel ball milling tanks and balls. In order to prevent powder oxidation during the MA process, inert gas argon is introduced for protection. The ratio of balls to materials is 20:1, and the amount of alcohol added is such that the powder is not covered It is suitable to grind the balls, the ball milling speed is 450rpm, the ball milling time is 60h, and the fully alloyed Bi 0.5 Sb 1.5 Te 3 powder( figure 1 ), and its grain size can reach te...

Embodiment 3

[0049] (Preparation of hot-pressed sintered samples with a hot-pressing temperature of 550°C, a pressure of 150 MPa, and a holding time of 2 hours)

[0050] (1) The high-purity Bi, Sb, Te elemental powders are batched according to the atomic ratio of Bi: Sb: Te=0.5: 1.5: 3, the mixed powder is packed into a ball mill jar, and the purity of 99.7% alcohol is added as a ball mill medium, and the batching , canning and sampling were all carried out in a vacuum glove box. Ball milling is completed on a high-energy ball mill, using stainless steel ball milling tanks and balls. In order to prevent powder oxidation during the MA process, inert gas argon is introduced for protection. The ratio of balls to materials is 20:1, and the amount of alcohol added is such that the powder is not covered It is suitable to grind the balls, the ball milling speed is 450rpm, the ball milling time is 60h, and the fully alloyed Bi 0.5 Sb 1.5 Te 3 powder( figure 1 ), and its grain size can reach te...

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Abstract

The invention discloses a method for preparing a thermoelectric material with a P-type nano-structure and a Bi0.5Sb1.5Te3 matrix. The method includes synthesizing P-type Bi0.5Sb1.5Te3 compound nanometer powder from high-purity Bi powder (with purity of 99.99%), Sb powder and Te powder in a mechanical alloying (MA) manner; and sintering the Bi0.5Sb1.5Te3 precursor nanometer powder into the dense fine crystal thermoelectric material by a vacuum hot-pressing sintering (HP) method. The problem of volatility of elements such as Bi, Sb and Te in a melting state is avoided, and the material with uniform components and fine texture can be prepared. The granularity of the powder reaches a nanometer grade, phonon scattering is increased effectively, thermal conductivity is lowered, and the thermoelectric performance is enhanced.

Description

technical field [0001] The present invention relates to thermoelectric materials, in particular to a method for preparing nanoscale P-type bismuth telluride (Bi 0.5 Sb 1.5 Te 3 ) Preparation method of bulk thermoelectric material. Background technique [0002] Thermoelectric materials are an important class of functional materials that use the thermoelectric effect to couple and convert thermal energy and electrical energy to each other through the movement of carriers inside the material. Thermoelectric conversion technology is a technology that uses the Seebeck effect and Peltier effect of semiconductor thermoelectric materials to directly convert thermal energy and electrical energy, including thermoelectric power generation and thermoelectric refrigeration. The Seebeck effect can be used to generate electricity, and the Peltier effect can be used to achieve refrigeration or temperature control. This type of material has broad application prospects in the fields of po...

Claims

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Application Information

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IPC IPC(8): H01L35/34
Inventor 荆洪阳陈岚徐连勇韩永典
Owner TIANJIN UNIV
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