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Preparation method for scandium yttrium aluminate powder

A technology of yttrium scandate and powder, which is applied in the field of preparation of yttrium scandate powder, can solve the problems of long time consumption, limited production of yttrium scandate powder, etc., and achieves the effects of low preparation cost, satisfying requirements and low impurity content

Inactive Publication Date: 2014-12-24
BOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional solid-state reaction technology for preparing yttrium scandate powder takes a long time and requires high temperature and high pressure conditions. The reaction is usually carried out at a temperature higher than 1300 ° C and a pressure higher than 1k bar (see J.B. Clark, P.W. Richter, L .Du Toit, Journal of Solid State Chemistry, 1978, 23, 129–134), thus limiting the production of yttrium scandate powder

Method used

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  • Preparation method for scandium yttrium aluminate powder
  • Preparation method for scandium yttrium aluminate powder
  • Preparation method for scandium yttrium aluminate powder

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Accurately weigh yttrium nitrate, scandium chloride and urea, put them into aqueous methanol solution (volume ratio 1:1) and stir to dissolve for more than 30 minutes. This solution, at 450 DEG C, cross-linking reaction 4 h, after reaction, cool down to room temperature naturally, and molten salt (the molten salt is the mixture of sodium chloride and potassium chloride, the molar ratio of sodium chloride and potassium chloride is 1 : 1) After mixing, put it into a mortar and grind it finely, and the grinding time is 30 minutes. The molar ratio of the above yttrium nitrate, scandium chloride, molten salt and urea is 1:1:2:10. Put the above-mentioned mixture into a crucible and put it into a box-type resistance furnace for calcination reaction. The reaction temperature is 800 °C, and the reaction time is 4 h. After cooling, it is washed with water and dried to prepare yttrium scandate powder. The purity of its products is not less than 99.76%, and the impurity content: ...

Embodiment 2

[0030] Accurately weigh yttrium nitrate, scandium nitrate and citric acid, put them into methanol aqueous solution (volume ratio 1:1) and stir to dissolve for more than 30 minutes. This solution, at 500 DEG C, cross-linking reaction 5 h, after the reaction, cool down to room temperature naturally, and molten salt (the molten salt is the mixture of sodium chloride and potassium chloride, the molar ratio of sodium chloride and potassium chloride is 1 : 1) After mixing, put it into a mortar and grind it finely, and the grinding time is 30 minutes. The molar ratio of the above yttrium nitrate, scandium nitrate, molten salt and citric acid is 1:1:2:20. Put the above mixture into a crucible and put it into a box-type resistance furnace for calcination reaction. The reaction temperature is 1000 °C and the reaction time is 24 h. After cooling, it is washed with water and dried to prepare yttrium scandate powder. The purity of its products is not less than 99.91%, and the impurity c...

Embodiment 3

[0032] Accurately weigh yttrium nitrate, scandium nitrate and urea, put them into methanol aqueous solution (volume ratio 1:1) and stir to dissolve for more than 30 minutes. This solution, at 150 ℃, cross-linking reaction 10 h, after reaction, cool to room temperature naturally, and molten salt (molten salt is the mixture of sodium chloride and potassium chloride, sodium chloride and potassium chloride mol ratio 1 : 1) After mixing, put it into a mortar and grind it finely, and the grinding time is 30 minutes. The molar ratio of the above yttrium nitrate, scandium nitrate, molten salt and urea is 1:1:2:20. Put the above-mentioned mixture into a crucible and put it into a box-type resistance furnace for calcination reaction. The reaction temperature is 800 °C and the reaction time is 12 h. After cooling, it is washed with water and dried to prepare yttrium scandate powder. The purity of its products is not less than 99.85%, and the impurity content: carbon is less than 0.10%...

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Abstract

The invention discloses a preparation method for scandium yttrium aluminate powder. The preparation method comprises the following steps: fully dissolving yttrium salts, scandium salts and different cross-linking agents as raw materials in a methanol and water mixing solution; then performing a cross-linking reaction on the mixture at certain temperature; mixing the reacted mixture with fused salts and grinding for fully and uniformly mixing the mixture; finally, performing high-temperature calcination treatment and washing drying to obtain the scandium yttrium aluminate powder, wherein the mole ratio of the yttrium salts to the scandium salts to the fused salts to the cross-linking agents is 1:1:2:10-200; the yttrium salts are one of yttrium chloride and yttrium nitrate or the mixture of the yttrium chloride and the yttrium nitrate; the scandium salts are one of scandium chloride or scandium nitrate or the mixture of the scandium chloride and the scandium nitrate; the cross-linking agents are one of urine or citric acid or the mixture of the urine and the citric acid. The preparation method disclosed by the invention has the advantages of simplicity, convenience, feasibility, high purity, low impurity content, low preparation cost of products and suitability for batch production. The prepared products can be applied to the fields of ferroelectricity, photoelectricity, photocatalysis, fuel cells and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic non-metallic materials, and in particular relates to a preparation method of yttrium scandate powder. Background technique [0002] Perovskite refers to a class of oxides with a specific crystal structure, and its general molecular formula is ABO 3 . Due to the many characteristics of the structure of this type of compound, it is widely used and studied in condensed matter physics and chemical catalysis. The A site is generally a rare earth or alkaline earth element ion, and the B site is a transition element ion. Similar other metal ions are partially substituted while keeping its crystal structure basically unchanged. Due to the stable crystal structure, unique electromagnetic properties and high redox, hydrogenolysis, isomerization, electrocatalysis and other activities of these compounds, as a new type of functional material, they have great potential in the fields of env...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00B01J23/10
Inventor 张杰许家胜
Owner BOHAI UNIV
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