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Europium-zinc-antimony-based Zintl phase thermoelectric material and preparation method thereof

A europium-zinc-antimony-based, phase-based thermoelectric technology, applied in the field of thermoelectric materials, can solve problems such as limitations and performance optimization, achieve low lattice thermal conductivity, improve thermoelectric performance, and inhibit bipolar diffusion

Active Publication Date: 2019-03-29
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

[0006] The performance of thermoelectric materials is determined by the dimensionless figure of merit ZT=[S 2 σ / (κ e +κ L )] T characterization, increase the electrical conductivity σ and Seebeck coefficient S, while reducing the thermal conductivity κ (κ is the carrier thermal conductivity κ e , the lattice thermal conductivity κ L and the bipolar effect κ B sum) is the key to material optimization, but the three physical quantities are interrelated, so that the optimization of performance is limited by practical

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  • Europium-zinc-antimony-based Zintl phase thermoelectric material and preparation method thereof
  • Europium-zinc-antimony-based Zintl phase thermoelectric material and preparation method thereof
  • Europium-zinc-antimony-based Zintl phase thermoelectric material and preparation method thereof

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[0027] The preferred embodiments of the present invention will be further described in detail below.

[0028] A kind of europium zinc antimony base Zintl phase thermoelectric material, its chemical composition is Eu 2 Zn 1-x Sb 2 , where x satisfies 0≤x≤0.1. Further preferably, x satisfies 0≤x≤0.04. It is prepared by the following steps:

[0029] Eu by stoichiometric ratio 2 Zn 1-x Sb 2 Calculate the amount of each raw material, weigh each raw material, put it into a ball mill jar, mill it for 6-10 hours, put the obtained powder into a graphite mold, and heat press it at 550-580°C and 50MPa for 2-20 hours. 5 minutes.

[0030] In this specific embodiment, different samples are prepared according to x=0, 0.01, 0.02, and 0.04, respectively Eu 2 Zn 1 Sb 2 、Eu 2 Zn 0.99 Sb 2 、Eu 2 Zn 0.98 Sb 2 、Eu 2 Zn 0.96 Sb 2 . The thermoelectric performance of the above samples was compared with the p-type Zintl phase thermoelectric material with excellent performance in th...

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Abstract

The invention provides a europium-zinc-antimony-based Zintl phase thermoelectric material and a preparation method thereof. The chemical composition of the europium-zinc-antimony-based Zintl phase thermoelectric material is Eu2Zn(1-x)Sb2, wherein x is greater than or equal to 0 and less than or equal to 0.1. Compared with a reported 1-2-2 type europium-zinc-antimony compound, the new Eu, Zn and Sbternary compound thermoelectric material is of a completely-different crystal structure; a compound of the structure is extremely low in crystal lattice heat conductivity and high in carrier mobility; the electrical transport property can be effectively improved by adjusting the vacancy of Zn; double-pole diffusion is inhibited; and the thermoelectric performance of the material is improved.

Description

technical field [0001] The invention belongs to the technical field of thermoelectric materials, and in particular relates to a europium-zinc-antimony-based Zintl phase thermoelectric material and a preparation method thereof. Background technique [0002] Thermoelectric materials are functional materials that can realize mutual conversion of thermal energy and electrical energy, and can be used in many fields such as solar energy, industrial waste heat, conversion and utilization of waste heat from automobile exhaust, and thermoelectric refrigeration. Refrigeration and power generation systems made of thermoelectric materials have the advantages of small size, light weight, long service life, no noise and no pollution during operation. Thermoelectric materials have been used in the last century. In space probes, thermoelectric generators powered by radioactive isotopes are the only power supply system. It has been successfully applied to more than 20 spacecraft such as Ap...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/06C22C1/04
CPCC22C1/007C22C30/06C22C1/047
Inventor 张倩陈辰曹峰李善李孝芳张宗委王心宇刘兴军
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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