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Method for preparing SLYTON perovskite type nitrogen oxide powder

A nitrogen oxide and perovskite-type technology, applied in chemical instruments and methods, tantalum compounds, inorganic chemistry, etc., can solve the problems of long time consumption and limitation of SLYTON powder production, and achieve low preparation cost, meet requirements, and disperse good sex effect

Inactive Publication Date: 2014-10-08
BOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method for preparing SLYTON perovskite type nitrogen oxide powder
  • Method for preparing SLYTON perovskite type nitrogen oxide powder
  • Method for preparing SLYTON perovskite type nitrogen oxide powder

Examples

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. 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 4 h. After natural cooling, That is the precursor. The precursor was nitrided in an ammonia atmosphere, the nitriding temperature was 850 °C, and the time was 6 hours. After cooling, SLYTON powder was 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. 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 6 h. After natural cooling, That is the precursor. The precursor was nitrided in an ammonia atmosphere, the nitriding temperature was 850 °C, and the time was 7 hours. After cooling, SLYTON powder was 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. 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 4 h. After natural cooling, That is the precursor. The precursor was nitrided in an ammonia atmosphere, the nitriding temperature was 850 °C, and the time was 6 hours. After cooling, SLYTON powder was 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 type nitrogen oxide powder. The method comprises the following steps: after fully dissolving a soluble strontium salt, a soluble lanthanum salt, a soluble yttrium salt, a soluble tantalum salt and a combustion adjuvant in a mixed solution of alcohol and water, carrying out temperature programming for combustion reaction; maintaining for a while at a high temperature stage; cooling to form a precursor; then, carrying out nitriding and high temperature treatment to obtain a target product, wherein the soluble strontium salt is one of strontium chloride or strontium nitrate or a mixture thereof, the soluble lanthanum salt is one of lanthanum chloride or lanthanum nitrate or a mixture thereof, the soluble yttrium salt is one of yttrium chloride or yttrium nitrate or a mixture thereof and the soluble tantalum salt is one of tantalum pentachloride or tantalum pentaethoxide or a mixture thereof, and the combustion adjuvant is one of urea or citric acid or a mixture thereof. The product disclosed by the invention is high in purity and low in content of impurities 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-responsive photolysis of water to produce hydrogen (Kudo, A.; Miseki, Y., Heterogeneous photocatalyst materials for water splitting. Chem Soc Rev , 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 u...

Claims

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Application Information

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