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Method for preparing strontium titanate nano powder through microwave hydrothermal method

A microwave hydrothermal method and nano-powder technology, applied in the field of nano-materials, can solve the problems of strong corrosion of high-concentration sodium hydroxide, increased consumption of underwear materials, and poor product dispersion. It is not easy to achieve particles, low cost, and equipment simple effect

Inactive Publication Date: 2012-09-19
无锡隆傲电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to overcome the problems existing in the above three methods, the patent document CN102320651A discloses a microwave-assisted hydrothermal method to prepare line-phase strontium titanate nanopowders. This method directly puts tetra-n-butyl titanate and strontium nitrate in the reaction In the kettle, add 4mol / L sodium hydroxide solution, and then the reaction kettle reacts in a microwave reactor. In this method, the reactant is placed in a high-concentration alkali to react, which makes the product poor in dispersibility, easy to agglomerate, and poor in crystal quality, and High-concentration sodium hydroxide is highly corrosive, which increases the consumption of inner shirt materials in the reactor

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  • Method for preparing strontium titanate nano powder through microwave hydrothermal method

Examples

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Effect test

Embodiment 1

[0028] 1) Measure 1.0ml of butyl titanate, add it to 25ml of absolute ethanol, add 5ml of glacial acetic acid, and magnetically stir until dissolved to obtain solution A;

[0029] 2) Weigh 0.6349g of strontium nitrate, add it into 30ml of deionized water, and magnetically stir until dissolved to obtain solution B;

[0030] 3) While stirring, add solution B dropwise to solution A, and continue stirring for at least 10 minutes until a homogeneous sol is formed;

[0031] 4) Weigh 4.0000g of sodium hydroxide and add it into the sol under stirring to form a precursor slurry with a pH value of 14;

[0032] 5) Put the precursor slurry into a polytetrafluoroethylene-lined reactor for microwave hydrothermal reaction. The filling degree of the reactor is 60%, the reaction temperature is 180°C, the reaction time is 1h, and the microwave power is 400W. The product after the microwave hydrothermal reaction was fully washed with deionized water and absolute ethanol, filtered, a...

Embodiment 2

[0035] 1) Measure 1.7ml of butyl titanate, add it to 25ml of absolute ethanol, and add 5ml of glacial acetic acid, stir magnetically until dissolved to obtain solution A;

[0036] 2) Weigh 1.0582g of strontium nitrate, add it into 30ml of deionized water, and magnetically stir until dissolved to obtain solution B;

[0037] 3) While stirring, add solution B dropwise to solution A, and continue stirring for at least 10 minutes until a homogeneous sol is formed;

[0038] 4) Weigh 4.0000g of sodium hydroxide and add it into the sol under stirring to form a precursor slurry with a pH value of 14;

[0039] 5) Put the precursor slurry into a polytetrafluoroethylene-lined reactor for microwave hydrothermal reaction. The filling degree of the reactor is 60%, the reaction temperature is 180°C, the reaction time is 1h, and the microwave power is 400W. The product after the microwave hydrothermal reaction was fully washed with deionized water and absolute ethanol, filtered, a...

Embodiment 3

[0041] 1) Measure 1.0ml of butyl titanate, add it to 25ml of absolute ethanol, and add 5ml of glacial acetic acid, stir until dissolved by magnetic force, and obtain solution A;

[0042] 2) Weigh 0.6349g of strontium nitrate, add it into 30ml of deionized water, and magnetically stir until dissolved to obtain solution B;

[0043] 3) While stirring, add solution B dropwise to solution A, and continue stirring for at least 10 minutes until a homogeneous sol is formed;

[0044] 4) Weigh 4.0000g of sodium hydroxide and add it to the above sol under stirring to form a precursor slurry with a pH value of 14;

[0045] 5) Put the precursor slurry into a polytetrafluoroethylene-lined reactor for microwave hydrothermal reaction. The filling degree of the reactor is 70%, the reaction temperature is 150°C, the reaction time is 2 hours, and the microwave power is 400W. The product after the microwave hydrothermal reaction was fully washed with deionized water and absolute etha...

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Abstract

The invention discloses a method for preparing strontium titanate nano powder through a microwave hydrothermal method. The method includes: mixing titanate, ethanol and acetic acid, adding water solution containing strontium ions in dropwise mode to form sol, then adding alkali, adjusting potential of hydrogen (pH) value of the sol to 8-14, obtaining precursor slurry, placing the precursor slurry in a reaction kettle, performing microwave hydrothermal reaction, and separating and drying reaction products to obtain the strontium titanate nano powder. Compared with a conventional hydrothermal method, the method is rapid in reaction, easy to control, free of high-temperature calcination, simple in device and low in cost. The obtained strontium titanate nano powder is intact in crystallization, even in particle size and narrow in distribution range.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and in particular relates to a method for preparing strontium titanate nanopowder by using a microwave hydrothermal method. Background technique [0002] Strontium titanate is an important ABO 3 type perovskite oxides with excellent properties such as high dielectric constant, high voltage resistance, and temperature stability. Through stress induction or doping, strontium titanate can also have ferroelectricity. In addition, strontium titanate has good semiconductivity, so it is widely used in the field of electronic ceramics industry. With the rapid development of science and technology, the requirements of high precision, high reliability, multi-function and miniaturization are put forward for electronic ceramic components, and the preparation of high-purity, ultra-fine strontium titanate nano-powder raw materials is the key to meet the above requirements . [0003] Patent document CN 131...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00B82Y40/00
Inventor 吴纪梁吴頔
Owner 无锡隆傲电子有限公司
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