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High-temperature thermoelectric material and preparation method thereof

A thermoelectric material and high-temperature technology, applied in the field of Ca2-xRExAg2-ySb2 material and its preparation, thermoelectric materials and its preparation, can solve the problems of low alloy efficiency, difficult device manufacturing, and difficult material preparation, etc., and achieves easy preparation and device manufacturing Easy, easy-to-cut effect

Inactive Publication Date: 2015-06-10
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are two main types of high-temperature thermoelectric materials that have been partially applied with high efficiency in the high-temperature region: Si x -Ge y Alloy and Yb 14 MnSb 11 , but these two types of materials have their own problems, one is Si x -Ge y The efficiency of the alloy is not high, and its p-type device has only the efficiency of thermoelectric figure of merit (zT=0.6) at high temperature; the second is Yb 14 MnSb 11 Sensitive in the air, the material is difficult to prepare, and the device is difficult to manufacture
The above problems limit its application

Method used

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  • High-temperature thermoelectric material and preparation method thereof
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  • High-temperature thermoelectric material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Embodiment 1, high temperature thermoelectric material Ca 2-x Ce x Ag 2-y Sb 2 (x=0.33,y=0.31) Preparation method of metal flux:

[0036] Raw materials are metal elements: Ca (calcium), Ce (cerium), Ag (silver), Sb (antimony), according to the molar ratio of Ca / RE / Ag / Sb=1:1:1:2, and then add metal Pb to help The solvents are fully mixed, and the molar ratio of Ca:Pb=1:20; a mixture is obtained.

[0037] First put the prepared mixture into a corundum crucible, and put it into a quartz tube to evacuate, put the sealed reaction into a box furnace, raise the temperature to 900°C at 250°C / h, and keep it at 900°C for 24 hours. Then slowly cool down to 600°C at 5°C / h, and keep warm at 600°C for 24 hours. At this time, the flux is removed, and centrifuged at 2500r / min in a low-speed centrifuge for 5 minutes. The crystal structure of the obtained polycrystalline material is determined to be hexagonal by single crystal diffraction. Department, P6 3 The mc space group, the d...

Embodiment 2

[0038] Embodiment 2, series of high temperature thermoelectric materials Ca 2-x Ce x Ag 2-y Sb 2 (x=0.33,y=0.31) high temperature solid phase preparation method:

[0039] Put the raw metal elements Ca / Ce / Ag / Sb into the metal niobium tube according to the stoichiometric ratio (1.67:0.33:1.69:2), and obtain the pure-phase raw materials through a two-step reaction method. The first step is to seal the Nb tube into the quartz tube, vacuumize, put the quartz tube into the tube furnace at 250°C / h to raise the temperature to 1100°C, and keep it at 1100°C for 96 hours. At this time, turn off the power of the furnace body and quickly cool down to room temperature; the second step The second step is to open the niobium tube in the glove box, fully grind the raw materials and refill the niobium tube, and pack it into the quartz tube again and evacuate it, put the quartz tube into the tube furnace and raise the temperature to 1100°C at 250°C / h. And keep it at 1100°C for 48 hours. At t...

Embodiment 3

[0041] Embodiment 3, high temperature thermoelectric material Ca 2-x La x Ag 2-y Sb 2 (x=0.18,y=0.15) high temperature solid phase preparation method:

[0042] As described in Example 2, the difference is that the four elemental raw materials are loaded into the metal niobium tube in a molar ratio of Ca:La:Ag:Sb=1.82:0.18:1.85:2, and other steps and process parameters are the same as those in the example 2 are the same.

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Abstract

The invention relates to high-temperature thermoelectric material and a preparation method thereof. The high-temperature thermoelectric material has a general formula: Ca2-xRExAg2-ySb2, wherein La or Ce or Pr or Nd or Sm is adopted for the RE, the X is smaller than or equal to 1, and the y is smaller than or equal to 1; the raw materials are heated to 1100 DEG C till a decomposition point and a melting point do not exist; polycrystal materials are prepared by using a high temperature solid state method or a metal co-solvent method, and prepared and molded through spark plasma sintering (SPS); and as for thermoelectric property of an obtained block of the materials, the thermoelectric figure of merit can reach to 0.67 in 1100K. By means of the preparation method, the obtained high-temperature thermoelectric polycrystal block which is high in purity, high in efficiency and capable of existing in the air stably is prepared, and can be used as high-temperature thermoelectric materials.

Description

technical field [0001] The invention relates to a thermoelectric material for high temperature application and a preparation method thereof, in particular to Ca 2-x RE x Ag 2-y Sb 2 The (RE=La, Ce, Pr, Nd, Sm) material and its preparation method belong to the field of new energy materials. Background technique [0002] Thermoelectric materials refer to a special class of semiconductor compounds, using which people can conveniently realize mutual conversion between thermal energy and electrical energy. In other words, through the medium of thermoelectric materials, we can generate electricity by applying a temperature difference between the two ends, and at the same time, we can also apply a voltage across the two ends to generate a temperature difference. This physical characteristic of thermoelectric materials makes it have great application prospects in power generation and refrigeration, especially in energy saving and emission reduction. By converting waste heat ener...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L35/18H01L35/34H10N10/853H10N10/01
Inventor 夏盛清王建陶绪堂
Owner SHANDONG UNIV