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Method for preparing LaAlO3 powder by means of molten salt method

The technology of lanthanum aluminate and powder is applied in the field of preparation of lanthanum aluminate powder, which can solve the problems of low purity, uneven particle size distribution of lanthanum aluminate powder, and high synthesis temperature, and achieves high purity and environmental friendliness. Preparation method, effect of low synthesis temperature

Inactive Publication Date: 2017-04-05
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The characteristic of the example of the present invention is to provide a preparation method of lanthanum aluminate powder, which aims to solve the problems of uneven particle size distribution, low purity and high synthesis temperature of the lanthanum aluminate powder prepared by the current technology

Method used

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  • Method for preparing LaAlO3 powder by means of molten salt method
  • Method for preparing LaAlO3 powder by means of molten salt method

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preparation example Construction

[0028] The particle size of the lanthanum aluminate powder obtained by the preparation method of the present invention is 0.1-3 μm, and the shape is cubic.

[0029] The purity of the lanthanum aluminate powder prepared by the invention is above 99%, even as high as 99.8%.

[0030] The lanthanum aluminate powder prepared in the example of the present invention has small particle size, uniform distribution, high purity, and can be mass-produced.

[0031]The characteristics of the present invention are: compared with the traditional solid-phase method, the example of the present invention uses molten salt as the reaction medium, which provides a liquid-phase reaction environment, and the reaction temperature is significantly reduced from 1000°C to 700-800°C; medium, avoiding the agglomeration between lanthanum aluminate powders; the molten salt used is soluble in deionized water, easy to collect lanthanum aluminate powder, and the molten salt can be recycled and used repeatedly, ...

Embodiment 1

[0034] Lanthanum oxide and aluminum oxide are used as initial raw materials, wherein the purity of lanthanum oxide is 99.8% (mass percentage) and the purity of aluminum oxide is 99.9% (mass percentage). The balance weighs 3.26g of lanthanum oxide, 1.02g of aluminum oxide, and 12.84g of sodium chloride and potassium chloride molten salt, and grinds for ten minutes with a mortar. Then put it into a resistance furnace and raise the temperature to 800°C at a rate of 5°C / min to react for 4 hours, and then lower the temperature with the furnace. Wash with 34ml of deionized water and suction-filter the obtained filter cake containing the reactant, and then wash with 34ml of deionized water and suction-filter the obtained filter cake, and repeat this five times. Until no white precipitate was detected by silver nitrate. Then the washed product was baked in an oven at 100°C for 4 hours to obtain 4.1 g of lanthanum aluminate powder with a purity of 99%.

Embodiment 2

[0036] Lanthanum oxide and aluminum oxide are used as initial raw materials, wherein the purity of lanthanum oxide is 99.8% (mass percentage) and the purity of aluminum oxide is 99.9% (mass percentage). Weigh 3.26g of lanthanum oxide, 1.02g of aluminum oxide, and 21.4g of molten salt of sodium chloride and potassium chloride on the balance, and grind for ten minutes with a mortar. Then put it into a resistance furnace and raise the temperature to 800° C. for 6 hours at a rate of 5° C. / min, and then cool down with the furnace. Wash with 51ml of deionized water and suction filter the obtained filter cake containing the reactant, and then wash with 51ml of deionized water and suction filter the obtained filter cake, and repeat this five times. Until no white precipitate was detected by silver nitrate. Then the washed product was baked in an oven at 100° C. for 4 hours to obtain 4.1 g of lanthanum aluminate powder with a purity of 99%.

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Abstract

The invention relates to a method for preparing LaAlO3 powder by means of a molten salt method. The method for preparing the LaAlO3 powder by means of the molten salt method comprises the steps that firstly, a mixture of La2O3 and Al2O3 which are in the molar mass ratio of 1:1 is evenly mixed with a molten salt medium, the temperature of the mixture is raised to 700-800 DEG C at the speed of 1-10 DEG C per minute, the temperature is kept for 4-12 hours, and the temperature is lowered to the indoor temperature, wherein the ratio between the total mass of the mixture of La2O3 and Al2O3 and the mass of molten salt is 1:3-1:10; secondly, the mixture obtained after a reaction is washed with water at least once so that the molten salt medium can be removed, and the LaAlO3 powder is obtained after drying. According to the method for preparing the LaAlO3 powder by means of the molten salt method, oxides are used as raw materials, the conversion efficiency is high, the adopted molten salt can be recycled, and therefore the method for preparing the LaAlO3 powder by means of the molten salt method is low in cost and environmentally friendly. In addition, the method for preparing the LaAlO3 by means of the molten salt method has the advantages that operation is simple, the synthesis temperature is low, the synthesis time is short, and the method for preparing the LaAlO3 powder by means of the molten salt method is suitable for mass product.

Description

technical field [0001] The present invention relates to the field of material preparation, more specifically, relates to the preparation method of lanthanum aluminate powder. Background technique [0002] Lanthanum aluminate (LaAlO 3 ) belongs to ABO with perovskite structure 3 Compounds have been used as substrate materials for high-temperature superconducting microwave devices, and are currently the most important single-crystal materials for industrialized, large-scale high-temperature superconducting thin-film substrates. LaAlO 3 Crystal has its unique status in high temperature superconducting substrate materials. LaAlO 3 With its superior performance, it has become an ideal substrate material for high-temperature YBCO materials, especially suitable for the growth of superconducting films for microwave use. YBCO films have been realized on LaAlO 3 Epitaxial growth on substrates, and LaAlO 3 Single crystals are easy to grow. In addition, LaAlO 3 It is also a good...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00
Inventor 张良柱林慧兴姜少虎姚晓刚赵相毓罗澜
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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