A kind of method for preparing slyton perovskite type nitrogen oxide powder

A nitrogen oxide and perovskite-type technology, which is applied in chemical instruments and methods, tantalum compounds, inorganic chemistry, etc., can solve the problems of time-consuming and limited production of SLYTON powder, and achieve good dispersion, low impurity content, The effect of high purity

Inactive Publication Date: 2016-01-20
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 SLYTON powder takes a long time and requires high temperature conditions. The reaction is usually carried out at a high temperature of 1000-1400°C, which limits the production of SLYTON powder

Method used

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  • A kind of method for preparing slyton perovskite type nitrogen oxide powder
  • A kind of method for preparing slyton perovskite type nitrogen oxide powder
  • A kind of method for preparing slyton perovskite type nitrogen oxide powder

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Experimental program
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Effect test

Embodiment 1

[0031] Put strontium nitrate, lanthanum nitrate, yttrium nitrate, tantalum pentachloride and urea in a molar ratio of 1:1:1:1:20, accurately weigh them and put them into methanol aqueous solution (alcohol-water volume ratio 1:1) and stir to dissolve , the time is greater than 30 minutes. The above-mentioned mixture is directly put into the muffle furnace after being packed into a large crucible, 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 4h. After natural cooling, the Get precursors. The precursor is nitrided in an ammonia atmosphere, the nitriding temperature is 850°C, and the time is 6 hours. After cooling, SLYTON powder is obtained. The purity of its products is not less than 99.86%, and the impurity content: carbon is less than 0.12%; chlorine is less than 0.01%.

Embodiment 2

[0033] Put strontium nitrate, lanthanum nitrate, yttrium nitrate, tantalum pentachloride and urea in a molar ratio of 1:1:1:1:50, accurately weigh them and put them into methanol aqueous solution (volume ratio of alcohol to water: 2:1) and stir to dissolve , the time is greater than 30 minutes. The above-mentioned mixture is directly put into the muffle furnace after being packed into a large crucible, 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 6h. After natural cooling, the Get precursors. The precursor is nitrided in an ammonia atmosphere, the nitriding temperature is 850°C, and the time is 7 hours. After cooling, SLYTON powder is obtained. The purity of its products is not less than 99.85%, and the impurity content: carbon is less than 0.13%; chlorine is less than 0.01%.

Embodiment 3

[0035] Put strontium nitrate, lanthanum nitrate, yttrium nitrate, tantalum pentachloride and citric acid in a molar ratio of 1:1:1:1:20, accurately weigh them and put them into methanol aqueous solution (alcohol-water volume ratio 1:1) and stir Dissolved for more than 30 minutes. The above-mentioned mixture is directly put into the muffle furnace after being packed into a large crucible, 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 4h. After natural cooling, the Get precursors. The precursor is nitrided in an ammonia atmosphere, the nitriding temperature is 850°C, and the time is 6 hours. After cooling, SLYTON powder is obtained. The purity of its products is not less than 99.84%, and the impurity content: carbon is less than 0.14%; chlorine is less than 0.01%.

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Abstract

The invention discloses a method for preparing SLYTON perovskite nitrogen oxide powder, which comprises fully dissolving soluble strontium salt, soluble lanthanum salt, soluble yttrium salt, soluble tantalum salt and combustion auxiliary agent in alcohol-water mixed solution , the combustion reaction occurs when the temperature is programmed, and it is kept in the high temperature stage for a certain period of time, and the precursor is formed by cooling, and then the precursor is subjected to high-temperature nitriding treatment to obtain the target product. Soluble strontium salt is one of strontium chloride or strontium nitrate or a mixture thereof; soluble lanthanum salt is one of lanthanum chloride or lanthanum nitrate or a mixture thereof; soluble yttrium salt is one of yttrium chloride or yttrium nitrate or a mixture thereof. The soluble tantalum salt is one of tantalum pentachloride or tantalum pentaethoxide or their mixture; the combustion aid is one of urea or citric acid or their mixture. The product of the invention has high purity and low impurity content, and can be used in 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 method for preparing nitrogen oxide powder with SLYTON type perovskite structure. Background technique [0002] Transition metal oxynitrides with a perovskite structure (such as semiconductor materials based on niobium and tantalum) have also attracted increasing attention as a new type of efficient visible light photocatalyst. Since the nitrogen atom participates in the formation of the energy band structure, the bandgap width is narrowed, and it can be used as a semiconductor photocatalyst for visible light response photolysis of water to produce hydrogen (Kudo, A.; Miseki, Y., Heterogeneous photocatalystmaterialsforwatersplitting. ChemSocRev , 2009, 38(1):253-278). Sr 0.5 La 0.5 Y 0.5 Ta 0.5 o 2.5 N 0.5 (abbreviated as SLYTON) is an important lead-free perovskite-type ferroelectric material. It is mainly used in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G35/00
Inventor 张杰许家胜张帆
Owner BOHAI UNIV
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