Method for preparing pyroelectric material Ag complex (Ca***La*)*Co*O

A thermoelectric material, 3co4o9 technology, applied in the field of preparation of Ag composite oxide thermoelectric materials, can solve the problems of high reaction temperature, large energy consumption, poor chemical uniformity, etc., and achieves low reaction temperature, low sintering temperature and fast heating rate Effect

Inactive Publication Date: 2008-04-09
HARBIN INST OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to solve the uneven distribution of the Ag phase in the Ag composite Ca-Co-O-based oxide, which is easy to agglomerate, and the Ag phase particle size is large, resulting in the formation of carriers between the Ca-Co-O-based oxide grains Transport loop, the problem of significantly reducing the Seebeck coefficient of Ag composite Ca-Co-O-based oxides, rare earth element doping modification will reduce the conductivity of Ca-Co-O-based oxid

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  • Method for preparing pyroelectric material Ag complex (Ca***La*)*Co*O
  • Method for preparing pyroelectric material Ag complex (Ca***La*)*Co*O

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specific Embodiment approach 1

[0012] Specific embodiment one: present embodiment Ag compound (Ca 1-X La X ) 3 co 4 o 9 Prepare according to the following steps: one, calcium nitrate, cobalt nitrate and lanthanum nitrate are dissolved in distilled water according to the ratio of 2.7~3.0 moles of calcium nitrate, 3.92~4 moles of cobalt nitrate and 0.01~0.3 moles of lanthanum nitrate; Add complexing agent citric acid in the preparation solution, the add-on of citric acid and the metal ion La in the preparation solution of step one 3+ , Ca 2+ and Co 2+ The mol ratio of total amount is 1~4: 1; Three, add silver nitrate in the mixed solution of step 2, silver nitrate and the La that add in step 1 3+ and Ca 2+ The molar ratio of the total amount is 1 to 5:300; 4. Add acrylamide monomer and N, N'-methylenebisacrylamide to the mixed solution in step 3, add acrylamide monomer and N, N'- The concentration of acrylamide monomer in the mixed solution of methylenebisacrylamide is 50-100g / L, and the amount of N,N...

specific Embodiment approach 2

[0019] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the silver nitrate added in step 3 and the La added in step 1 3+ and Ca 2+ The molar ratio of the total amount is 2-4:300. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0020] Specific embodiment three: the difference between this embodiment and specific embodiment one is: the silver nitrate added in step 3 and the La added in step 1 3+ and Ca 2+ The molar ratio of the total amount is 5:300. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

The invention discloses a preparation method of thermoelectric material Ag compound (Ca(1-X)LaX)3Co4O9, and relates to the preparation method of Ag compound oxide thermoelectric material. The invention resolves the problems that the distribution of Ag phases in an Ag compound Ca-Co-O-based oxide is not even, the size of Ag phase particles is large, thereby leading that current carrier transporting loop is formed between Ca-Co-O-based oxide crystal grains, and leading Seebeck coefficient of the Ag compound Ca-Co-O-based oxide to be reduced evidently, and the existence of lanthanon results in decreasing the electrical conductivity of the Ca-Co-O-based oxide. The preparation methods comprises that firstly, calcium nitrate, cobalt nitrate and lanthanum nitrate are dissolved in distilled water; secondly, citric acid is add; thirdly, silver nitrate is added; fourthly, organic monomers and network agent are added; fifthly, initiating agent is added; sixthly, microwave dry is performed; seventhly, calcination is operated; eighthly, the spark plasma sintering is performed. The distribution of Ag phases in Ag compound (Ca(1-X)LaX)3Co 4O9 prepared by the methods of the invention is even, the size of the Ag phase particles is smaller than 500 nm, and the current carrier transporting loop is not formed. The Seebeck coefficient of the Ag compound (Ca(1-X)LaX)3Co4O9improves 1.7 percent to 4.9 percent than that of the Ca3Co4O9, the electrical conductivity improves 13.3 percent to 38.9 percent, and the power factor improves 21.6 percent to 35.1 percent.

Description

technical field [0001] The invention relates to a preparation method of an Ag composite oxide thermoelectric material. Background technique [0002] With the increasingly prominent energy and environmental issues, waste heat power generation, a thermoelectric conversion technology, has received more and more attention as a new energy technology with a wide range of applications and meets the requirements of green environmental protection. It is of great significance for the development of circular economy and the construction of a conservation-oriented society. Ca-Co-O-based oxides are currently widely used high-temperature thermoelectric materials in the industrial field. Ca-Co-O-based oxides have good thermal stability and can work for a long time in a high-temperature oxidizing atmosphere. They are non-toxic and non-polluting. The advantages of good thermal stability, long service life, simple preparation and low cost, especially Ag composite Ca-Co-O-based oxides are the ...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F3/10
Inventor 宋英王福平姜兆华赵丽荣
Owner HARBIN INST OF TECH
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