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Method for preparing silver-lead-lanthanum-tellurium thermoelectric material

A technology of thermoelectric materials and mixed solutions, which is applied to the growth of polycrystalline materials, chemical instruments and methods, selenium/tellurium compounds, etc., can solve the problems of unfavorable expansion of production, expensive raw materials, and low output, so as to avoid the introduction of structural defects and impurities , Raw materials are simple and easy to obtain, and the effect of short time

Inactive Publication Date: 2010-12-08
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing silver-lead-lanthanum-tellurium thermoelectric materials in order to solve the existing problems of high temperature required for the preparation of thermoelectric materials, expensive raw materials, low output, and unfavorable expansion of production

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  • Method for preparing silver-lead-lanthanum-tellurium thermoelectric material
  • Method for preparing silver-lead-lanthanum-tellurium thermoelectric material
  • Method for preparing silver-lead-lanthanum-tellurium thermoelectric material

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specific Embodiment approach 1

[0011] Embodiment 1: The preparation method of a silver-lead-lanthanum-tellurium thermoelectric material in this embodiment is as follows: 1. 0.2g polyvinylpyrrolidone, 0.01-0.03g AgNO 3 , 0.4~0.5g Pb(CH 3 COO) 2 ·3H 2 O, 0.04~0.06gLa(NO 3 ) 3 ·6H 2 O and 0.3~0.4g Na 2 TeO 3 Dissolve in 10mL solvent, then put it on a magnetic stirrer and stir for 30-60min at a stirring speed of 4000-8000r / min to obtain mixture A. The solvent is deionized water or 1-3mL deionized water and 7- A mixed solution composed of 9mL absolute ethanol; 2. Add 0-2.0g KOH to the mixture A, and then add 0.2-0.5g hydrazine to mix and stir evenly to obtain the mixed solution B; 3. Add the mixed solution B to the In a polytetrafluoroethylene-lined high-pressure reactor, seal it, then heat treat it at a temperature of 110°C to 210°C for 12 to 24 hours, and naturally cool to room temperature to obtain AgPb 10 LaTe 12 The precursor of thermoelectric material; 4. The AgPb 10 LaTe 12 The thermoelectric m...

specific Embodiment approach 2

[0015] Specific embodiment two: the difference between this embodiment and specific embodiment one is that in step one, 0.2g polyvinylpyrrolidone, 0.02g AgNO 3 , 0.44g Pb(CH 3 COO) 2 ·3H 2 O, 0.05g La(NO 3 ) 3 ·6H 2 O and 0.32g Na 2 TeO 3 Dissolve in a mixed solution consisting of 1-3mL deionized water and 7-9mL absolute ethanol. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0016] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the mixed solution in step 1 consists of 2 mL deionized water and 8 mL absolute ethanol. Others are the same as those in the first or second embodiment.

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Abstract

The invention discloses a method for preparing a silver-lead-lanthanum-tellurium thermoelectric material, and relates to a method for preparing the thermoelectric material. The method solves the problems of high temperature requirement for preparing the conventional thermoelectric material, expensive raw materials, low yield and no contribution to expanded production. The method comprises the following steps of: 1, preparing a mixture A; 2, preparing mixed solution B; 3, preparing an AgPb10LaTe12 thermoelectric material precursor; and 4, filtering and washing the AgPb10LaTe12 thermoelectric material precursor and performing vacuum drying to obtain the silver-lead-lanthanum-tellurium thermoelectric material. The method has the advantages of no need of high temperature, simple and easily obtained raw materials, capabilities of obtaining the AgPb10LaTe12 thermoelectric powder material with high degree of crystallization and narrow particle distribution and increasing the purity of the AgPb10LaTe12 thermoelectric material to be over 99 percent and contribution to expanded production.

Description

technical field [0001] The invention relates to a preparation method of a thermoelectric material. Background technique [0002] In August 2009, Chem.Mater. reported the synthesis of AgPb by solid phase method m LaTe m+2 material articles where AgPb 25 LaTe 27 The ZT value can reach ~0.9 at 670K. Due to AgPb m LaTe m+2 Good thermoelectric properties and application prospects have attracted widespread attention at home and abroad. Currently preparing AgPb m LaTe m+2 The method of the system thermoelectric alloy material is mainly a solid phase method, and the preparation method has the disadvantages of high temperature required in the preparation process, the reaction raw materials are all simple metals, expensive and complicated equipment, and the output of the obtained product is small, which is not conducive to expanding production. Contents of the invention [0003] The object of the present invention is to provide a method for preparing a silver-lead-lanthanum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/46C30B7/10C01B19/00
Inventor 王群陈刚陈大宏王琳
Owner HARBIN INST OF TECH