Multiple filling skutterudite thermoelectric material and preparation process thereof

A technology for filling skutterudite and thermoelectric materials, applied in the direction of the lead wire material of thermoelectric device junctions, etc., can solve the problems of reduced thermal conductivity, complicated process, difficulty in obtaining pure multi-filled skutterudite compounds, etc. Low, simple process effect

Inactive Publication Date: 2006-11-15
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thermal conductivity of filled skutterudite materials is still high, and there is still a lot of room for decline
[0004] L.Chen et al synthesized (Ba, Sr) by solid state reaction method y co 4 Sb 12 , (Ba, Ce) y co 4 Sb 12 , (Ba, La) y co 4 Sb 12 Compound (20 th International Conference on Thermoelectrics, 57, 2001), although the thermal conductivity of the material is lower than that of single-filled compounds, the process of preparing multi-filled skutterudite by solid-state reaction method is very complicated, the crystallinity of the material is poor, and it is difficult to obtain high-filled skutterudite. The amount, the material contains impurities, so the performance of the material has not been improved
D.Berardan prepared Ce by arc melting method 1-y Yb y Fe 4 Sb 12 (Journal of Alloys and Compounds, 351, 18, 2003) and (Ce-Yb) y Fe 4-x (Co/Ni) 4 Sb 12 (Journal of Applied Physics...

Method used

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  • Multiple filling skutterudite thermoelectric material and preparation process thereof
  • Multiple filling skutterudite thermoelectric material and preparation process thereof
  • Multiple filling skutterudite thermoelectric material and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Sr 0.25 Yb 0.1 co 4 Sb 12 Material

[0019] The metal raw materials Sr, Yb, Co, and Sb are mixed according to the molar ratio of 0.25:0.1:4:12, sealed in a quartz tube, and a small amount of Ar gas is filled in the quartz tube for protection. The mixed raw materials were melted at 1000° C. for 3.5 hours. Quenching is carried out after melting, the quenching medium is oil, and the quenching speed is about 150°C / s. X-ray diffraction analysis showed that the synthesized material was pure Sr 0.25 Yb 0.1 co 4 Sb 12 Filled with skutterudite material (see figure 1 ). Thermal conductivity tests show that Sr 0.25 Yb 0.1 co 4 Sb 12 Multi-filled materials have a higher ratio than (single) filled skutterudite Sr y co 4 Sb 12 Lower lattice thermal conductivity (see figure 2 ). ZT value calculation results show that Sr 0.25 Yb 0.1 co 4 Sb 12 Multi-filled skutterudite materials have excellent thermoelectric properties (see image 3 ).

Embodiment 2

[0020] Example 2: Sr 0.2 Ce 0.2 co 3.0 Fe 1.0 Sb 12 Material

[0021] The metal raw materials Sr, Ce, Co, Fe, Sb are compounded according to the molar ratio of 0.2:0.2:3:1:12, sealed in a quartz tube, and the inside of the quartz tube is vacuumed. The mixed raw materials were melted at 1050° C. for 1 hour. Quenching is carried out after the melting is completed, the quenching medium is water, and the quenching speed is about 200°C / s. X-ray diffraction analysis showed that the synthesized material was Sr 0.25 Ce 0.05 co 3.0 Fe 1.0 Sb 12 Filled with skutterudite material.

Embodiment 3

[0022] Example 3: Ca 0.05 Eu 0.25 co 3.5 Ni 0.5 Sb 11.95 Te 0.05 Material

[0023] The metal raw materials Ca, Eu, Co, Ni, Sb, Te are mixed according to the molar ratio of 0.05:0.25:3.5:0.5:11.95:0.05, sealed in a quartz tube, and a small amount of Ar gas is filled in the quartz tube for protection. The mixed raw materials were melted at 1025° C. for 2.5 hours. Quenching is carried out after the melting is completed, the quenching medium is brine, and the quenching speed is about 300°C / s. X-ray diffraction analysis showed that the synthesized material was Ca 0.05 Eu 0.25 co 3.5 Ni 0.5 Sb 11.95 Te 0.05 Filled with skutterudite material.

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Abstract

This invention relates to a multi filled skutterudite thermoelectric material. Its characteristic is filling of two or more than two metal atoms I in the hole of skutterudite AB3 crystal icosahedron, the ratio of I:A:B is y:4;:12. In the equation, A represents one or two of Fe, Co and Ni, B is one or two of S6, Se and Fe, I is two or more than two of K, Na, Ca, Sr, Ba, Yb, Ce, La or Ou, y is the sum padding whose volume is met to 0.05-1. The production process of the thermoelectric material includes feeding, melting and quenching, it has the characteristic such as simple processes, low cost and being suitable to produce.

Description

technical field [0001] The invention relates to a multi-filled skutterudite thermoelectric material and a preparation method thereof, belonging to the field of thermoelectric materials. Background technique [0002] Thermoelectric power generation technology is a technology that directly converts thermal energy into electrical energy. It has the characteristics of small size, high reliability, and long life. It plays an important role in technical fields such as space science, military equipment, and waste heat power generation. The key to the thermoelectric power generation system is the thermoelectric material, and its performance is usually expressed by the dimensionless performance index ZT (ZT=α 2 σT / κ, where α is the Seebeck coefficient; σ is the electrical conductivity; κ is the thermal conductivity, and T is the absolute temperature). The higher the ZT value, the better the performance of the material and the higher the efficiency of thermoelectric power generation....

Claims

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Application Information

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IPC IPC(8): C22C12/00C22C1/02C22C29/00C22C30/00C22F1/00H01L35/12
Inventor 柏胜强陈立东赵雪盈裴艳中
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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