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Burning method for preparing Sr2YTaO6 powder

A technology of strontium tantalate and combustion method, which is applied in chemical instruments and methods, tantalum compounds, inorganic chemistry, etc., can solve the problems of long time consumption, and achieve the effect of low preparation cost, low impurity content and meeting requirements

Inactive Publication Date: 2014-10-01
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 strontium yttrium tantalate powder is time-consuming and requires high temperature conditions, and the reaction is usually carried out at 1100-1300°C (see Howard, C. J.; Barnes, P. W.; Kennedy, B. J.; Woodward, P. M., Structures of the ordered double perovskites Sr2YTaO6 and Sr2YNbO6. Acta Crystallographica Section B: Structural Science, 2005,61 (3): 258-262.), thus limiting the Production

Method used

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  • Burning method for preparing Sr2YTaO6 powder
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  • Burning method for preparing Sr2YTaO6 powder

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Accurately weigh strontium nitrate, yttrium nitrate, tantalum pentachloride and urea according to the molar ratio of 2:1:1:10, put them into methanol aqueous solution (alcohol-water volume ratio 1:1) and stir to dissolve for more than 30 minutes . Put the above-mentioned mixture into a large crucible and put it directly into a muffle furnace. The heating rate of the programmed temperature rise is 10 °C / min, the high temperature setting temperature is 800 °C, and the holding time of the high temperature stage is 10 h. After natural cooling, That is to get strontium yttrium tantalate powder, the product purity is not less than 99.86%, impurity content: carbon is less than 0.06%; chlorine is less than 0.01%.

Embodiment 2

[0031] Accurately weigh strontium nitrate, yttrium nitrate, tantalum pentachloride and urea according to the molar ratio of 2:1:1:20, put them into methanol aqueous solution (volume ratio of alcohol to water: 2:1) and stir to dissolve for more than 30 minutes . Put the above-mentioned mixture into a large crucible and put it directly into a muffle furnace. The heating rate of the programmed temperature rise is 10 °C / min, the high temperature setting temperature is 900 °C, and the holding time of the high temperature stage is 10 h. After natural cooling, That is to get strontium yttrium tantalate powder, the product purity is not less than 99.85%, impurity content: carbon is less than 0.07%; chlorine is less than 0.01%.

Embodiment 3

[0033] Accurately weigh strontium nitrate, yttrium nitrate, tantalum pentachloride and citric acid in a molar ratio of 2:1:1:20 and put them into methanol water solution (volume ratio of alcohol to water: 1:1) to stir and dissolve for more than 30 minutes. minute. Put the above-mentioned mixture into a large crucible and put it directly into a muffle furnace. The heating rate of the programmed temperature rise is 10 °C / min, the high temperature setting temperature is 800 °C, and the holding time of the high temperature stage is 10 h. After natural cooling, That is to get strontium yttrium tantalate powder, the product purity is not less than 99.82%, impurity content: carbon is less than 0.09%; chlorine is less than 0.01%.

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Abstract

The invention discloses a burning method for preparing Sr2YTaO6 powder. The method comprises the following steps: dissolving soluble strontium salt, soluble yttrium salt, soluble tantalum salt and a burning adjuvant in an alcohol water mixed solution fully, carrying out combustion reaction in a muffle furnace through temperature programming, and maintaining for a certain time at the high temperature stage to obtain the target product Sr2YTaO6 powder; the molar ratio of the soluble tantalum salt and the burning adjuvant is 1: (1-500), the soluble strontium salt is either of strontium chloride or strontium nitrate or a mixture of the two, the soluble yttrium salt is either of yttrium chloride or yttrium nitrate or a mixture of the two, the soluble tantalum salt is either of tantalum pentachloride and tantalum pentamethoxide or a mixture of the two, and the burning adjuvant is either of carbamide or citric acid or a mixture of the two. The method has the advantages that the purity of obtained product is high, the impurity content is low, and the product preparing cost is low, so that the Sr2YTaO6 powder is suitable for batch production, and the target product can be used in the fields such as ferroelectric, photoelectricity, photocatalysis and 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 method for preparing strontium yttrium tantalate powder by a combustion method. Background technique [0002] Perovskite refers to a class of oxides with a specific crystal structure, and its general molecular formula is ABO 3 , this type of compound was first discovered as calcium titanate (CaTiO 3 ) compound, hence the name. 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 environmental protection and industrial catalysis. Great development potential. Strontium yttrium tantalate (Sr 2 wxya 6 ) is an important double perovskite structure (AA'BB'O 6 )Material. It is mainly used in photocatalysis, ion sensing, magnet...

Claims

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Application Information

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IPC IPC(8): C01G35/00
Inventor 许家胜张杰
Owner BOHAI UNIV
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