A kind of preparation method of multi-component composite rare earth oxide with high conductivity layered structure

A rare earth oxide and multi-component composite technology, which is applied in the preparation of molybdenum compounds, chemical instruments and methods, molybdenum compounds, etc. Large-scale production, simple reaction synthesis conditions, and the effect of improving electrical and thermal conductivity

Active Publication Date: 2021-11-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above studies show that the application of multiple rare earth oxides in silver-based electrical contact materials can effectively reduce the silver content and resistivity, and at the same time improve the processing performance of composite materials, which is expected to solve the problem of high resistivity and contact resistance of existing low-silver content silver-based electrical contact materials. Problems of high temperature, high temperature and poor processability
[0003] However, the above-mentioned existing technologies generally have problems such as high resistivity of the obtained rare earth oxides, complicated preparation methods, difficulty in large-scale preparation and application, etc.

Method used

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  • A kind of preparation method of multi-component composite rare earth oxide with high conductivity layered structure
  • A kind of preparation method of multi-component composite rare earth oxide with high conductivity layered structure
  • A kind of preparation method of multi-component composite rare earth oxide with high conductivity layered structure

Examples

Experimental program
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Effect test

Embodiment 1

[0028] (1) Preparation of precursor solution A

[0029] The solute is citric acid and structure inducer Na in molar ratio = 1.5:1.5 2 MoO 4 , the solvent is to add a certain amount of propylene oxide gel accelerator (the mixed solution of mol ratio=0.5:1 between propylene oxide and citric acid; a certain amount of solute is added in the solvent, stirred until completely dissolved with magnetic force, and then Use a glass rod to transfer the liquid to a volumetric flask to constant volume, and prepare a colorless and transparent solution with a concentration of 0.03 mol / L, which is designated as precursor solution A.

[0030] (2) Preparation of precursor solution B

[0031] The solute is lanthanum nitrate and tin tetrachloride pentahydrate with a molar ratio of 1:1, and the solvent is deionized water; the solute is introduced into deionized water, stirred with magnetic force until completely dissolved, and then pipetted into a volumetric flask with a glass rod to stabilize T...

Embodiment 2

[0036] (1) Preparation of precursor solution A

[0037] The solute is citric acid and structure inducer Y (NO 3 ) 3 ·6H 2 0, the solvent is to add a certain amount of propylene oxide gel accelerator (the mixed solution of mol ratio=2.5:1 between propylene oxide and citric acid; a certain amount of solute is added in the solvent, until completely dissolved with magnetic stirring, Then use a glass rod to transfer the liquid to a volumetric flask to constant volume, and prepare a colorless and transparent solution with a concentration of 0.03 mol / L, which is designated as precursor solution A.

[0038] (2) Preparation of precursor solution B

[0039] The solute is lanthanum nitrate and tin tetrachloride pentahydrate with a molar ratio of 1:1, and the solvent is deionized water; the solute is introduced into deionized water, stirred with magnetic force until completely dissolved, and then pipetted into a volumetric flask with a glass rod to stabilize To prepare a colorless and...

Embodiment 3

[0044] (1) Preparation of precursor solution A

[0045] The solute is citric acid and structure inducer Na in molar ratio = 1.5:0.8 2 WO 4 2H 2 0, the solvent is to add a certain amount of propylene oxide gel accelerator (the mixed solution of mol ratio=1.2:1 between propylene oxide and citric acid; a certain amount of solute is added in the solvent, until completely dissolved with magnetic stirring, Then use a glass rod to transfer the liquid to a volumetric flask to constant volume, and prepare a colorless and transparent solution with a concentration of 0.03 mol / L, which is designated as precursor solution A.

[0046] (2) Preparation of precursor solution B

[0047] The solute is lanthanum nitrate and tin tetrachloride pentahydrate with a molar ratio of 1:1, and the solvent is deionized water; the solute is introduced into deionized water, stirred with magnetic force until completely dissolved, and then pipetted into a volumetric flask with a glass rod to stabilize To p...

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Abstract

The invention relates to a conductive multi-element composite oxide, and aims to provide a preparation method of a multi-element composite rare earth oxide with a highly conductive layered structure. Including: using citric acid and structure inducer X as solute, using gel accelerator and deionized water as solvent to prepare precursor solution A; using lanthanum nitrate and tin tetrachloride pentahydrate as solute, using deionized water as solvent , to prepare precursor solution B; add precursor solution A dropwise to precursor solution B to form a uniform transparent solution, and continue to react under stirring to obtain a uniform sol; after aging to form a wet gel, then vacuum freeze-drying treatment, The multi-component complex oxide block is prepared; after grinding, sieving and calcining, the multi-component complex rare earth oxide with high conductivity layered structure is obtained. The product obtained by the present invention has a multi-microchannel layered structure, which can increase the concentration of electron-hole pairs in the multi-element composite oxide phase and improve its electrical and thermal conductivity. The reaction synthesis conditions are simple, the cost is low, and it is favorable for large-scale production.

Description

technical field [0001] The invention relates to a conductive multi-component composite oxide, in particular to a preparation method of a high-conductivity layered structure multi-component composite rare earth oxide used in the fields of silver-based conductive alloys and electrocatalysis. Background technique [0002] Due to the distortion of the crystal structure, the multi-element rare earth metal composite oxides have a large number of oxygen vacancies, which make them have good electrical transport properties in a wide temperature range (resistivity can be as low as 10 3 μΩ·cm) and high catalytic performance, it has been widely used in electrode materials, fixed resistors, chemically sensitive materials, high-temperature heating materials, redox catalysts and other fields. However, there are few domestic and foreign related studies on the application of multi-element rare earth metal oxides in conductive alloys. The research group of Liu Xueyan of Shandong University p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G39/00C01G39/02B82Y30/00
CPCB82Y30/00C01G39/003C01G39/02C01P2004/03C01P2004/62C01P2004/64C01P2006/32C01P2006/40
Inventor 张玲洁暴宁钟
Owner ZHEJIANG UNIV
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