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Novel Zintl phase thermoelectric material and preparation method thereof

A technology of thermoelectric materials and phase thermoelectricity, applied in the field of thermoelectric materials, can solve the problems of low thermal-electric conversion efficiency, achieve the effect of reducing lattice thermal conductivity and improving thermoelectric performance

Active Publication Date: 2019-09-10
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the three physical parameters that determine the thermoelectric figure of merit of thermoelectric materials, Seebeck coefficient, resistivity and thermal conductivity, are interrelated, so it is difficult to independently control a certain parameter to achieve a significant improvement in thermoelectric figure of merit. – The main reason why the power conversion efficiency remains low

Method used

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  • Novel Zintl phase thermoelectric material and preparation method thereof
  • Novel Zintl phase thermoelectric material and preparation method thereof
  • Novel Zintl phase thermoelectric material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030]In this embodiment, a novel Zintl phase thermoelectric material, its chemical formula is YbMg 2 Sb 2 , characterized in that it includes the following steps:

[0031] a. Use Yb, Mg and Sb as raw materials in a glove box in an argon atmosphere environment, according to the target product chemical formula YbMg 2 Sb 2 The composition ratio of 1:2:2 weighs each component and puts it into a ball mill jar equipped with grinding balls and seals it;

[0032] b. Put the ball mill jar in the above step a into a high-energy ball mill for alloying for 2-12 hours to obtain powder for later use;

[0033] c. Put the alloyed powder of the above step b into a graphite mold and hot press and sinter to 99% or more of the theoretical density to obtain the desired thermoelectric material YbMg 2 Sb 2 , the sintering temperature rises from room temperature to 400-800°C, the heating rate is 100°C / min, the sintering holding time is 1-10min, and the sintering pressure is 80MPa.

[0034] Exp...

Embodiment 2

[0038] In this implementation, it is basically the same as Embodiment 1, and the special features are:

[0039] In the present embodiment, a kind of Na-doped novel Zintl phase thermoelectric material, its chemical formula is Yb 0.99 Na 0.01 Mg 2 Sb 2 , characterized in that it includes the following steps:

[0040] a. Using Na, Yb, Mg and Sb as raw materials in a glove box in an argon atmosphere environment, according to the target product chemical formula Yb 0.99 Na 0.01 Mg 2 Sb 2 The composition distribution ratio of 0.99:0.01:2:2 weighs each component and puts it into a ball mill jar equipped with grinding balls and seals it;

[0041] b. Put the ball mill jar in the above step a into a high-energy ball mill for alloying for 10-23 hours to obtain powder for later use;

[0042] c. Put the alloyed powder in the above step b into a graphite mold for hot pressing and sintering to 99% or more of the theoretical density to obtain the desired thermoelectric material Yb 0.9...

Embodiment 3

[0047] In this implementation, it is basically the same as in Embodiment 2, and the special features are:

[0048] In the present embodiment, a kind of Na-doped novel Zintl phase thermoelectric material, its chemical formula is Yb 0.98 Na 0.02 Mg 2 Sb 2 , characterized in that it includes the following steps:

[0049] a. Using Na, Yb, Mg and Sb as raw materials in a glove box in an argon atmosphere environment, according to the target product chemical formula Yb 0.98 Na 0.02 Mg 2 Sb 2 The composition distribution ratio of 0.98:0.02:2:2 weighs each component and puts it into a ball mill jar equipped with grinding balls and seals it;

[0050] b. Put the ball mill jar in the above step a into a high-energy ball mill for alloying for 2-16 hours to obtain powder for later use;

[0051] c. Put the alloyed powder in the above step b into a graphite mold for hot pressing and sintering to 99% or more of the theoretical density to obtain the desired thermoelectric material Yb 0...

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Abstract

The invention discloses a novel Zint1 phase thermoelectric material. The chemical formula of the novel Zintl phase thermoelectric material is YbMg2Sb2, the novel Zintl phase thermoelectric material isa pure-phase hexagonal crystal structure, the width of a forbidden band calculated by the energy band structure is 1.23 eV, the YbMg2Sb2 thermoelectric material is doped with Na, the chemical formulais Yb1-xNaxMg2Sb2, Mg2Sb2, and x is greater than or equal to 0 and less than or equal to 0.025. Na is doped at the position of Yb, so that the concentration of carriers is increased, and meanwhile, the thermal conductivity of lattices is reduced, the thermoelectric performance is improved, and the highest thermoelectric optimal value is reached when the temperature is 77K. The novel Zintl phase thermoelectric material is prepared, the electricity and the heat transportation performance are optimized simultaneously through Na doping, and the novel Zintl phase thermoelectric material has an application potential. The development of the Zintl phase thermoelectric material is promoted.

Description

technical field [0001] The invention relates to the field of thermoelectric materials, in particular to a novel Zintl phase thermoelectric material and a preparation method thereof. Background technique [0002] Thermoelectric material is a material that can convert waste heat into electrical energy. It has no transmission parts, no noise, and no pollution, so it has attracted extensive attention in recent years. The thermoelectric energy conversion efficiency is determined by the Carnot efficiency of the thermoelectric material and the thermoelectric figure of merit (ZT), ZT=S 2 T / ρκ, S is the Seebeck coefficient, ρ is the resistivity, κ is the thermal conductivity, and T is the absolute temperature. The thermal conductivity is determined by the lattice thermal conductivity (κ L ), electronic thermal conductivity (κ e ) and bipolar thermal conductivity (κ B ) consists of three parts, a good thermoelectric material must have high Seebeck coefficient, low resistivity and ...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C12/00
CPCC22C1/007C22C12/00C22C1/047
Inventor 王超周婷姜晶牛夷
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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