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Method for preparing barium strontium titanate nano powder

A technology of nano-powder and barium strontium titanate, which is applied in the field of nano-powder preparation, can solve the problems of difficult control of stoichiometric ratio, large particle size of BST powder, uneven distribution, etc., and achieves short preparation period, uniform composition, Simple preparation method

Inactive Publication Date: 2011-11-16
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems of large particle size, uneven distribution, large agglomeration, and difficult control of stoichiometric ratio in the BST powder prepared by the prior art, the present invention provides a method for preparing barium strontium titanate nanopowder, so that the prepared powder The particle size is small, the distribution is uniform, the agglomeration is light, and the preparation process is simple and practical, so as to meet the current requirements of miniaturization, miniaturization and integration of devices for BST powder raw materials

Method used

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  • Method for preparing barium strontium titanate nano powder
  • Method for preparing barium strontium titanate nano powder
  • Method for preparing barium strontium titanate nano powder

Examples

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Embodiment 1

[0028] Take 0.1 mol of tetrabutyl titanate, add 2.0 mol of ethylene glycol, stir until clear; take 0.5 mol of CA powder, slowly add to the above solution, and drop in 48ml of water (add 0.5ml of water per gram of CA Calculation), stirred well until all CA dissolved to obtain a clear solution; according to Ba 0.70 Sr 0.30 TiO 3 The barium carbonate and strontium carbonate powder of stoichiometric ratio are mixed and ground in a mortar, and this mixed powder is slowly added in the above-mentioned clear solution, and a small amount of concentrated nitric acid is dripped (calculated by dripping 3 drops per 100ml solution), fully Stir until all the carbonates are dissolved to obtain a transparent light brown solution. Heat the above light brown solution in an oil bath at 55°C for 2 hours to form a sol-like substance; put the above-mentioned sol-like substance in an oven and keep it at 140°C for 20 hours, and finally turn black The viscous resin; the black viscous resin was carbon...

Embodiment 2

[0033] The difference between this example and Example 1 is only that the molar ratio (CA / M) of citric acid to total metal ions is 5.0, and the remaining contents are the same as those described in Example 1.

[0034] image 3 It is a TEM image of the barium strontium titanate powder prepared in this example. Depend on image 3 It can be seen that the particle size of the prepared strontium barium titanate powder is very small, about 15-25nm, which is close to the calculation result of XRD, the powder distribution is uniform, and the agglomeration degree is very low.

[0035] In summary, the nano-powder prepared by the method of the present invention has small particle size, light agglomeration, and uniform distribution, and the method has simple process, short cycle, cheap and easy-to-obtain raw materials, and does not require special equipment. It is suitable for large-scale production and is expected to obtain industrial applications.

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Abstract

The invention discloses a method for preparing barium strontium titanate nano powder. The method comprises the following steps of: adding ethylene glycol into tetrabutyl titanate and stirring for clarifying; adding citric acid into the prepared solution, adding water and stirring for clarifying; mixing barium carbonate powder with strontium carbonate powder according to the chemical metering ratio Ba1-xSrxTiO3, grinding, adding the mixture into the solution, dropwise adding concentrated nitric acid and stirring to obtain a transparent light brown solution; heating till the solution becomes a sol substance; putting the sol substance into a drying oven to form black tackifying resin; carbonizing to obtain a precursor; and calcining to obtain the barium strontium titanate powder nano powder. The nano powder prepared with the method has the advantages of small particle size, low agglomeration, uniform composition and the like, and can meet the preparation requirement of uniform nano powder; and moreover, the preparation method has the characteristics of easiness, short preparation period, application of readily-available raw materials, no need of special equipment, suitability for mass production, and hopefulness of industrial application.

Description

technical field [0001] The invention relates to a method for preparing barium strontium titanate nano powder, which belongs to the technical field of nano powder preparation. Background technique [0002] Ferroelectric BST (Ba 1-x Sr x TiO 3 , 0≤x≤1) Due to its excellent properties such as high dielectric constant and adjustable Curie temperature, ceramic materials are widely used in various electronic ceramic devices, such as various piezoelectric sensors, dynamic random access memory (DRAM) and phase shifter etc. Since it works near room temperature, no cooling device is needed, which greatly reduces the cost of producing infrared detectors. Uncooled infrared focal plane detectors made of such materials have the advantages of working at room temperature, wide response spectrum, fast response speed, all-weather work, low cost, low power consumption, long life, miniaturization, and high reliability. It has become one of the most striking technological breakthroughs in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/626
Inventor 毛朝梁董显林王根水姚春华
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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