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Co-precipitation method for preparing lanthanum cuprate (La2CuO4) powder

A co-precipitation method, lanthanum cuprate technology, applied in chemical instruments and methods, copper compounds, inorganic chemistry, etc., can solve the problems of high equipment requirements, high combustion temperature, fast reaction process, etc., and achieve narrow particle size distribution range, particle size The effect of controllable size and regular shape

Inactive Publication Date: 2012-04-11
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] However, these methods have their own shortcomings. For example, in order to obtain a high-purity target product in the solid-state reaction method, the reactant powder should be fine enough, and it needs to be roasted at high temperature for a long time and repeatedly ground, which is time-consuming. , and there are more impurity phases in the product; for the self-propagating combustion method, the combustion reaction is very violent, the combustion temperature is high, the reaction process is fast, it is not easy to control, the product is easy to sinter, and there is a high possibility of non-equilibrium phase in the product or metastable phase; for the hydrothermal method, because the reaction is carried out in a closed container, the growth process cannot be observed, which is not intuitive, and the equipment requirements are high (high temperature and high pressure resistant steel, corrosion-resistant lining), and the technology is difficult (temperature Strict pressure control), poor safety performance

Method used

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  • Co-precipitation method for preparing lanthanum cuprate (La2CuO4) powder
  • Co-precipitation method for preparing lanthanum cuprate (La2CuO4) powder

Examples

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Embodiment 1

[0019] 1) Analytical pure lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O) be dissolved in 55ml distilled water and make the solution A that lanthanum nitrate concentration is 1.4mol / L;

[0020] 2) Press La 3+ : Cu 2+ =2:1 molar ratio adds analytically pure copper nitrate (Cu(NO 3 ) 3 ·3H 2 O) get solution B;

[0021] 3) Add polyethylene glycol (PEG-4000) of 3% by mass of solution B to solution B as a dispersant, stir well to make it mix uniformly to obtain solution C;

[0022] 4) Ammonia solution with a concentration of 3mol / L is injected into the burette, slowly dripped into the solution C, and the coprecipitation reaction is carried out. The titration rate is controlled at 4ml / min, and at the same time, it is continuously stirred to generate a precipitate immediately, and the pH value of the reaction system is controlled at 9. The precipitate was repeatedly washed with distilled water and absolute ethanol, and the precipitate after suction filtration was dried at 100°C to ob...

Embodiment 2

[0026] 1) Analytical pure lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O) be dissolved in 70ml distilled water and make the solution A that lanthanum nitrate concentration is 2mol / L;

[0027] 2) Press La 3+ : Cu 2+ =2:1 molar ratio adds analytically pure copper nitrate (Cu(NO 3 ) 3 ·3H 2 O) get solution B;

[0028] 3) Add polyethylene glycol (PEG-4000) with 4% mass of solution B to solution B as a dispersant, stir well, and mix it uniformly to obtain solution C;

[0029] 4) Aqueous ammonia with a concentration of 4mol / L is injected into the burette, slowly dripped into the solution C, and the coprecipitation reaction is carried out. The titration rate is controlled at 5ml / min, and at the same time, it is continuously stirred to generate a precipitate immediately, and the pH value of the reaction system is controlled at 10. The precipitate was repeatedly washed with distilled water and absolute ethanol, and the precipitate after suction filtration was dried at 90°C to obtain the ...

Embodiment 3

[0032] 1) Analytical pure lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O) be dissolved in 100ml distilled water and make lanthanum nitrate concentration be the solution A of 0.8mol / L;

[0033] 2) Press La 3+ : Cu 2+ =2:1 molar ratio adds analytically pure copper nitrate (Cu(NO 3 ) 3 ·3H 2 O) get solution B;

[0034] 3) Add polyethylene glycol (PEG-4000) of 2% by mass of solution B to solution B as a dispersant, stir well, and mix it uniformly to obtain solution C;

[0035] 4) Ammonia solution with a concentration of 5mol / L is injected into the burette, slowly dripped into the solution C, and the coprecipitation reaction is carried out. The titration rate is controlled at 3ml / min, and at the same time, it is constantly stirred to generate precipitation immediately, and the pH value of the reaction system is controlled at 7. The precipitate was repeatedly washed with distilled water and absolute ethanol, and the precipitate after suction filtration was dried at 70°C to obtain th...

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Abstract

The invention relates to a co-precipitation method for preparing lanthanum cuprate (La2CuO4) powder, which comprises the following steps of: dissolving lanthanum nitrate in distilled water to obtain a solution A; adding copper nitrate into the solution A to obtain a solution B; adding polyethylene glycol into the solution B to obtain a solution C; injecting ammonia water into a burette, slowly dripping into the solution C, performing co-precipitation reaction, controlling the pH value of a reaction system to be between 7 and 11, repeatedly washing a precipitate by using the distilled water and absolute ethanol, performing suction filtering on the precipitate, and drying to obtain a precursor; and drying the precursor, performing heat treatment in a muffle furnace, cooling with the furnace, and grinding to obtain the La2CuO4 powder. The co-precipitation method for preparing the La2CuO4 powder has the advantages that: superfine powder with narrow particle size distribution, a controlled particle size, a regular shape and high activity can be prepared, the prepared La2CuO4 powder can reach micron level and even nano level, the process is simple, the period is short, cost is low, and the aim of practicality can be fulfilled.

Description

technical field [0001] The invention relates to a preparation method of lanthanum cuprate powder, in particular to a co-precipitation method for preparing lanthanum cuprate (La 2 CuO 4 ) powder method. Background technique [0002] La 2 CuO 4 made of perovskite layer (ABO 3 ) and salt rock layer (AO) along the c-axis direction in a ratio of 1:1 layered perovskite-like (A 2 BO 4 ) composite oxide, which is a p-type semiconductor material. Thanks to La 2 CuO 4 It is an alternate combination of two different structures, except for the combination with ABO 3 In addition to some properties similar to the perovskite structure, it also has a series of unique properties, such as layered structure, superconductivity and high-efficiency catalytic performance. Same as ABO 3 Compared to A 2 BO 4 The presence of AO rock-salt layers in type oxides makes ABO 3 BO in layer 6 The octahedra are distorted, thereby stabilizing the structure over a large elastic range. A 2 BO 4...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G3/00
Inventor 黄剑锋李意峰孙莹曹丽云吴建鹏
Owner SHAANXI UNIV OF SCI & TECH
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