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Elemental tellurium-based composite thermoelectric material

A technology of thermoelectric materials and simple substances, which is applied in the field of simple substance tellurium-based composite thermoelectric materials, can solve the problems of reduced lattice thermal conductivity and achieve the effects of reduced lattice thermal conductivity, low thermal conductivity and high power factor

Pending Publication Date: 2019-12-20
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still relatively few studies on the thermal transport properties of Te, and the reduction of the lattice thermal conductivity of Te is still facing challenges. It is of great significance to prepare high-performance Te-based thermoelectric materials with low thermal conductivity through appropriate methods.

Method used

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  • Elemental tellurium-based composite thermoelectric material
  • Elemental tellurium-based composite thermoelectric material
  • Elemental tellurium-based composite thermoelectric material

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preparation example Construction

[0041] The preparation method of elemental tellurium-based composite thermoelectric material in the present invention comprises the following steps:

[0042] (1) Te block, Sb powder and Se powder with a purity of not less than 99.99%, according to Te 1-x (Sb 2 Se 3 ) x Weigh each raw material component according to the mole fraction ratio in the formula, put it into a carbon-coated quartz tube and vacuumize it;

[0043] (2) Place the quartz tube filled with simple raw materials completed in step (1) in a vertical tube furnace for heating, and slowly raise the temperature to the melting temperature, so that the raw materials can fully react in the molten state, and then quenched in water to obtain the initial Ingot;

[0044] (3) The initial ingot obtained in step (2) is vacuum-encapsulated in a carbon-coated quartz tube again, placed in a vertical tube furnace, heated and annealed, then quenched to obtain an annealed ingot;

[0045] (4) Grinding the annealed ingot obtained...

Embodiment approach 1

[0053] In this embodiment, an elemental tellurium-based composite thermoelectric material whose general chemical formula is Te 1-x (Sb 2 Se 3 ) x , x are 0, 0.005, 0.02, 0.03, 0.05, 0.1 and 0.15 respectively, that is, in this embodiment, a single tellurium-based composite thermoelectric material has the chemical formulas of Te, Te 0.995 (Sb 2 Se 3 ) 0.005 、 Te 0.98 (Sb 2 Se 3 ) 0.02 、 Te 0.97 (Sb 2 Se 3 ) 0.03 、 Te 0.95 (Sb 2 Se 3 ) 0.05 、 Te 0.9 (Sb 2 Se 3 ) 0.1 and Te 0.85 (Sb 2 Se 3 ) 0.15 a series of materials.

[0054] In this embodiment, a specific preparation method of an elemental tellurium-based composite thermoelectric material is as follows:

[0055] (1) In a glove box filled with an argon atmosphere, put Te block, Sb powder and Se powder with a purity of not less than 99.99%, according to the general chemical formula Te 1-x (Sb 2 Se 3 ) x The mole fraction proportioning weighs each raw material component (total mass is 8 grams), packs ...

Embodiment approach 2

[0066] This embodiment is basically the same as Embodiment 1, and the special feature is that the value of x in this embodiment is 0.2.

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Abstract

An elemental tellurium-based composite thermoelectric material belongs to the field of thermoelectric materials, and is characterized in that the chemical formula of the thermoelectric material is Te<1-x>(Sb2Se3)x, wherein x is greater than or equal to 0 and less than or equal to 0.2. The preparation method comprises the following steps: weighing the raw material components according to the molarfraction of the chemical formula, and packaging a Te block, Sb powder and Se powder in a carbon-plated quartz tube in vacuum; putting the quartz tube into a vertical tube furnace for smelting; performing annealing treatment; and finally, grounding the obtained cast ingot into fine powder, and conducting spark plasma sintering to form a compact block, wherein the compact block has very low heat conductivity and high thermoelectric performance, and the thermoelectric figure of merit reaches 0.95. The thermoelectric performance of the elemental tellurium-based composite thermoelectric material isimproved through a smelting process, an annealing process and a spark plasma sintering process. Compared with the prior art, the antimony selenide component is introduced, so that the carrier concentration and the lattice thermal conductivity are synergistically optimized, the technological process is simple and controllable, and the cost is low.

Description

technical field [0001] The invention relates to an elemental tellurium-based composite thermoelectric material, which belongs to the field of thermoelectric materials, and in particular relates to a method of controlling the content of Sb2Se3 components, optimizing the hole carrier concentration range, and constructing a Te matrix containing zero-dimensional replacement site defects, An elemental tellurium-based composite thermoelectric material with a multidimensional defect structure of one-dimensional dislocation, two-dimensional grain boundary and three-dimensional second phase and its preparation method. Background technique [0002] Thermoelectric energy conversion materials, as a new energy material with no pollutant emissions, no transmission parts, no noise, and high reliability, can directly convert heat energy into electrical energy by using the directional movement of carriers inside a solid based on the Seebeck effect. A new generation of green energy technology...

Claims

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Application Information

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IPC IPC(8): H01L35/16H01L35/18
CPCH10N10/852H10N10/853
Inventor 陈少平安德成王文先樊文浩吴玉程孟庆森
Owner TAIYUAN UNIV OF TECH
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