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A rapid preparation of heterogeneous composite camno 3 Oxide-Based Thermoelectric Materials Approach

A technology of thermoelectric materials and oxides, applied in the field of thermoelectric ceramics, can solve the problems of low thermoelectric properties of ceramic powder, low material density, complex preparation process, etc., and achieve the effect of low cost, high density and simple operation

Active Publication Date: 2020-11-06
HEFEI UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to avoid the deficiencies in the above-mentioned prior art, the present invention provides a fast preparation of heterogeneous composite CaMnO 3 approach for oxide-based thermoelectric materials aimed at improving pure-phase CaMnO 3 The ceramic powder has low thermoelectric properties, and at the same time solves the problems of complex preparation process, long cycle, high cost and low material density in the prior art

Method used

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  • A rapid preparation of heterogeneous composite camno <sub>3</sub> Oxide-Based Thermoelectric Materials Approach
  • A rapid preparation of heterogeneous composite camno <sub>3</sub> Oxide-Based Thermoelectric Materials Approach

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Embodiment 1

[0022] This embodiment prepares heterogeneous composite CaMnO according to the following steps 3 Based oxide thermoelectric materials:

[0023] (1) Weigh the raw material Ca(NO 3 ) 2 4H 2 O, Mn(NO 3 ) 2 and In(NO 3 ) 3 4.5H 2 O, mixed and dissolved in deionized water, while adding complexing agent citric acid C 6 h 8 o 7 ·H 2 O and an appropriate amount of ethylene glycol were mixed uniformly to obtain a clear mixed solution; then the mixed solution was stirred and reacted at 80°C for 12 hours to obtain a brown gel; wherein, Ca(NO 3 ) 2 4H 2 O, Mn(NO 3 ) 2 , In(NO 3 ) 3 4.5H 2 The initial raw material molar ratio of O and citric acid is 0.98:1:0.02:5.88, and Ca in the mixed solution 2+ The concentration is 0.2mol / L;

[0024] Place the brown gel in a drying oven, firstly dry at 90°C for 36 hours, then raise the temperature to 120°C and dry for 4 hours, then raise the temperature to 140°C and dry for 5.5 hours, and finally raise the temperature to 160°C and d...

Embodiment 2

[0029] This embodiment prepares heterogeneous composite CaMnO by the same method of embodiment 1 3 Oxide-based thermoelectric materials, the only difference is that in step (1) Ca(NO 3 ) 2 4H 2 O, Mn(NO 3 ) 2 , In(NO 3 ) 3 4.5H 2The initial raw material molar ratio of O and citric acid was 0.96:1:0.04:5.76.

Embodiment 3

[0031] This embodiment prepares heterogeneous composite CaMnO by the same method of embodiment 1 3 Oxide-based thermoelectric materials, the only difference is that in step (1) Ca(NO 3 ) 2 4H 2 O, Mn(NO 3 ) 2 , In(NO 3 ) 3 4.5H 2 The initial raw material molar ratio of O and citric acid was 0.92:1:0.08:5.52.

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Abstract

The invention discloses a method for rapidly preparing a multiphase composite CaMnO3-based oxide thermoelectric material. The method comprises the following steps: controlling the addition amount of In(NO3)2 so as to obtain CaMnO3-based oxide polycrystalline powder by adopting a citric acid sol-gel method; performing compression molding on the polycrystalline powder by utilizing a cold isostatic press; and finally, performing pressure-less sintering in air, thereby obtaining the multiphase composite CaMnO3-based oxide thermoelectric material block. According to the method disclosed by the invention, the CaMnO3 series thermoelectric materials are subjected to multiphase composite modification, so that the high-temperature chemical stability is maintained, the electrical resistivity is reduced, and the thermoelectric quality factor ZT is improved. Compared with single-phase CaMnO3, the material disclosed by the invention has the advantages that the thermoelectric quality factor is improved by about 4.57 times, and the thermoelectric properties are effectively improved.

Description

technical field [0001] The present invention proposes a heterogeneous composite CaMnO 3 The invention discloses a method for preparing an oxide-based thermoelectric material, belonging to the field of thermoelectric ceramics. Background technique [0002] With the rapid development of industrialization, the global environmental degradation and energy crisis are threatening the long-term stable development of human beings. The research and utilization of waste heat power generation, a green technology, has attracted more and more attention, which is very important for human environmental protection and sustainable development. Significance. More and more attention has been paid to oxide thermoelectric materials that can operate at high temperatures and be used in oxygen atmospheres. [0003] where CaMnO 3 It is a very rare perovskite manganese oxide with cubic (high temperature) and orthorhombic (low temperature) crystal structure, the space group is Pnma, and its Seebeck ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/01C04B35/624C04B35/622C04B35/64
CPCC04B35/016C04B35/622C04B35/624C04B35/64C04B2235/3208C04B2235/3286C04B2235/60C04B2235/668
Inventor 张久兴张静文张飞鹏杨新宇
Owner HEFEI UNIV OF TECH