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A Modified Co-precipitation Preparation of Low Resistivity Camno 3 Approaches to Composite Thermoelectric Materials

A low-resistivity, thermoelectric material technology, applied in the direction of thermoelectric device junction lead-out materials, etc., can solve the problems of restricting wide application, long preparation time, high resistivity of thermoelectric materials, etc.

Active Publication Date: 2020-10-23
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the existing methods all use the solid-phase method, in fact, the solid-phase reaction is used to add Bi to the system. 2 o 3 , because the raw materials require sufficient solid-state reaction, the preparation time is long, the operation is complicated, and the production cost is high, which limits their wide application in industry, and the resistivity of the prepared thermoelectric materials is also relatively high

Method used

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  • A Modified Co-precipitation Preparation of Low Resistivity Camno <sub>3</sub> Approaches to Composite Thermoelectric Materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1, a kind of low resistivity CaMnO 3 A method for preparing a composite thermoelectric material, the specific steps of the method are as follows:

[0032](1) Dissolve cetyltrimethylammonium bromide, calcium nitrate and manganese nitrate in water at a molar ratio of Ca:Mn=1:1 to obtain 1mol L of calcium nitrate and manganese nitrate -1 The mixed solution, wherein the addition of cetyltrimethylammonium bromide accounts for 0.05mol% of the total substance amount of calcium nitrate and manganese nitrate in the mixed solution, and then NH 4 HCO 3 The solution was added to the calcium-manganese mixed nitrate solution, and reacted under the reaction conditions of a reaction temperature of 50°C and a stirring speed of 500r / min until the precipitation was complete to obtain product A;

[0033] (2) Precipitate and age product A for 1 hour, filter and wash, and dry at 100°C to obtain product B;

[0034] (3) Mix bismuth metal and product B at a molar ratio of bismuth ...

Embodiment 2

[0037] Embodiment 2, a kind of low resistivity CaMnO 3 A method for preparing a composite thermoelectric material, the specific steps of the method are as follows:

[0038] (1) Dissolve cetyltrimethylammonium bromide, calcium nitrate and manganese nitrate in water at a molar ratio of Ca:Mn=1:0.5 to obtain 1mol L of calcium nitrate and manganese nitrate -1 The mixed solution, wherein the addition of cetyltrimethylammonium bromide accounts for 0.03mol% of the total substance amount of calcium nitrate and manganese nitrate in the mixed solution, and then NH 4 HCO 3 The solution was added to the calcium-manganese mixed nitrate solution, and reacted under the reaction conditions of a reaction temperature of 40°C and a stirring speed of 600r / min until the precipitation was complete to obtain product A;

[0039] (2) Precipitate and age product A for 0.5 hours, filter and wash, and dry at 80°C to obtain product B;

[0040] (3) Mix metal bismuth and product B at a molar ratio of met...

Embodiment 3

[0043] Embodiment 3, a kind of low resistivity CaMnO 3 A method for preparing a composite thermoelectric material, the specific steps of the method are as follows:

[0044] (1) Dissolve cetyltrimethylammonium bromide, calcium nitrate and manganese nitrate in water at a molar ratio of Ca:Mn=1:1.5 to obtain 1mol L of calcium nitrate and manganese nitrate -1 The mixed solution, wherein the addition of cetyltrimethylammonium bromide accounts for 0.07mol% of the total substance amount of calcium nitrate and manganese nitrate in the mixed solution, and then NH 4 HCO 3 The solution was added to the calcium-manganese mixed nitrate solution, and reacted under the reaction conditions of a reaction temperature of 60°C and a stirring speed of 400r / min until the precipitation was complete to obtain product A;

[0045] (2) Precipitate and age product A for 2 hours, filter and wash, and dry at 120°C to obtain product B;

[0046] (3) Mix bismuth metal with product B at a molar ratio of bis...

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Abstract

The invention discloses a method for preparing low resistivity CaMnO by modified co-precipitation 3 The method of composite thermoelectric materials is to mix calcium nitrate solution and manganese nitrate solution to obtain a mixed solution. First, add cetyltrimethylammonium bromide to the mixed solution, and then add NH 4 HCO 3 Until a precipitate occurs, product A is obtained; then product A is filtered, and the precipitate is dried to obtain product B; then metal bismuth is added to product B and mixed evenly to obtain product C; then product C is put into a mold and pressed to form, to obtain product C. Product D; finally, product D is sintered to obtain low resistivity CaMnO 3 Composite thermoelectric materials. The invention has the characteristics of short preparation time, simple operation, low production cost, can be widely used in industrial production, and has lower resistivity.

Description

technical field [0001] The present invention relates to a kind of CaMnO 3 Preparation method of composite thermoelectric material, especially a kind of modified co-precipitation to prepare CaMnO with low resistivity 3 Methods for Composite Thermoelectric Materials. Background technique [0002] Thermoelectric materials (thermoelectric materials) can realize the mutual conversion of heat energy and electric energy, which makes it a green and environmentally friendly energy conversion material that converts waste heat into electricity. The efficiency of thermoelectric materials can be expressed by the dimensionless thermoelectric figure of merit, ZT=S 2 T / ρκ, S is the Seebeck coefficient (or heat work, unit V K -1 ), ρ and κ are resistivity and thermal conductivity, respectively, and T is absolute temperature. Semiconductors have a lower carrier density, resulting in a larger S value, and the κ value is mainly dominated by phonon thermal conductivity. Thermal conductivity c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/01C04B35/622C04B35/626H01L35/22H10N10/855
Inventor 李翠芹陈前林赵颖周栋珍孙丽娟文娅
Owner GUIZHOU UNIV