A kind of thermoelectric material and preparation method thereof

A technology of thermoelectric material and hexagonal crystal system, which is applied in the direction of lead-out wire material of thermoelectric device, manufacture/processing of thermoelectric device, etc. simple effect

Active Publication Date: 2015-08-12
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, despite great progress in theory and experimentation of thermoelectric materials in the past ten years, the ZT value of thermoelectric materials has been changing in the range of 0.4-1.3, which is far from being practical; to achieve thermoelectric power generation and power-on refrigeration The goal of practical application is to achieve a ZT value of 3 or more
At the same time, in the past ten years, due to the application of the reaction flux method in high-temperature solid-phase synthesis, some alkali metal (alkaline earth metal) / rare earth / copper / tellurium compounds with novel structures have been successfully synthesized, such as the layered structure A 1-x RECu 1+x Te 4 , Rb 2 CeCu 3 Te 5 , KEuCu 2 Te 4 and BaRECuTe 3 , tunnel structure A 3 RE 4 Cu 5 Te 10 , CsRE 2 CuTe 4 and CsSc 3 Cu 2 Te 6 ; but the reported thermoelectric properties of these compounds found at present are relatively poor

Method used

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  • A kind of thermoelectric material and preparation method thereof
  • A kind of thermoelectric material and preparation method thereof
  • A kind of thermoelectric material and preparation method thereof

Examples

Experimental program
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Effect test

example 1

[0016] In the glove box operation, according to the ratio of the amount of substances CsCl: RE (La, Ce, Pr, Nd): Cu: Te = 3: 2.4: 5: 6, the total weight is about 10 grams, and the load is (φ11×13mm) Quartz tube, and then the quartz tube is melted and sealed under vacuum. Then the reactant is placed in a temperature-programmed tube furnace, and the heating program is as follows: from room temperature to 600°C at a rate of 75°C / hour, then to 950°C at a rate of 12°C / hour, and kept at 950°C for 50 hours, then Decrease to 600°C at a rate of 2°C / hour, close the furnace and allow it to cool naturally. Take out the quartz tube after cooling, and knock off the outer layer of quartz glass to obtain Cs x RE 2 Cu 6-x Te 6 Sinter the bars, crush the bars, wash with distilled water several times to remove CsCl and its Cs 3 RECl 6 After the by-products were removed, they were washed with anhydrous alcohol and then dried to obtain the pure target product.

example 2

[0018] Operated in a glove box, according to the ratio of the amount of substances CsCl: RE (La, Ce, Pr): Cu: Te = 2: 2.4: 5: 6, the total weight is about 18 grams, and put into (φ11×13mm) quartz tube , and then the quartz tube is melted and sealed under vacuum. Then the reactant is vertically placed in a temperature-programmed tube furnace, and the heating program is as follows: from room temperature to 600°C at a rate of 75°C / hour, then to 1000°C at a rate of 12°C / hour, and kept at 1000°C for 50 hours. Then the temperature was lowered to 600° C. at a rate of 10° C. / hour, and the furnace was closed to allow it to cool naturally. Take out the quartz tube after cooling, and knock off the outer layer of quartz glass to obtain Cs x RE 2 Cu 6-x Te 6 Sintered bar, the bottom 4-5mm of the quartz tube is mainly the target product Cs x RE 2 Cu 6-x Te 6 , the top 1mm of the quartz tube is mainly CsCl-Cs 3 RECl 6 eutectic mixture. The bottom 4-5mm sample was polished into a d...

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Abstract

The invention relates to a thermoelectricity material and a preparation method thereof, belonging to the field of inorganic materials. The thermoelectricity material is synthesized by an inorganic high-temperature solid-phase one-step synthesis method. A CsxRE2Cu6-xTe6 compound synthesized by the method belongs to a hexagonal crystal series, a space group is P63 / m. According to the primary thermoelectricity performance test of CsxRE2Cu6-xTe6 (RE=La, Ce, Pr), the compound of the series has relative high conductivity, a medium Seebeck coefficient and relative low thermal conductivity, and the ZT value is 0.26 (La, 614K), 0.17 (Ce, 660K) and 0.23 (La, 660K). The compound of the series probably has potential application value of thermoelectricity.

Description

technical field [0001] The invention relates to a thermoelectric material and a preparation method thereof, belonging to the field of inorganic materials. Background technique [0002] Thermoelectric material is a functional material capable of direct conversion of thermal energy and electrical energy through the transport of carriers in solids, and is considered to be a very competitive energy alternative medium in the future. Thermoelectric conversion technology is a new energy conversion technology that uses the Seebeck effect and Peltier effect of thermoelectric materials to convert heat energy and electrical energy into each other. This technology has the advantages of cleanness, quietness, convenient use and management, wide adaptability to the environment, and high safety and reliability. The development and utilization of thermoelectric conversion technology will play an increasingly important role in solving the future energy crisis, providing clean energy and impr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L35/16H01L35/34
Inventor 陈玲蒙昌宇吴立明
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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