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Method for preparing nanometer barium-strontium titanate powder

A nano-titanium and barium strontium technology, which is applied in nanostructure manufacturing, nanotechnology, nanotechnology, etc., can solve the problems of uneven distribution, impure crystal phase, and large particle size of barium strontium titanate powder, and achieve uniform particle size distribution. , The effect of improving crystal phase purity and avoiding grain growth

Inactive Publication Date: 2010-07-28
江苏晨朗电子集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of the barium strontium titanate powder prepared by the prior art method with large particle size, uneven distribution, and impure crystal phase, the present invention provides a method for preparing nano barium strontium titanate powder, which is prepared by a liquid-solid solution method The strontium barium titanate powder can reduce its particle size, and the particle size distribution is uniform, and can improve the crystal phase of the strontium barium titanate powder

Method used

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  • Method for preparing nanometer barium-strontium titanate powder
  • Method for preparing nanometer barium-strontium titanate powder
  • Method for preparing nanometer barium-strontium titanate powder

Examples

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Embodiment 1

[0015] Example 1, will analyze pure grade white Ba(Ac) 2 0.75Mol / L, crystalline Sr(Ac) 2 1 / 2H 2 O0.5mol / L, 5mL of distilled water, 4mol / L of sodium hydroxide, 1.0g of sodium oleate, 15mL of oleic acid, 10mL of butanol and 1.25mol / L of n-tetrabutyl titanate are added to the stainless steel hydrothermal heat of the Teflon liner Kettle, and then gently moved to a hydrothermal furnace, heated at 160 ° C for 24h. The reacted mixed solution was naturally cooled to room temperature, the supernatant was removed, and the reaction precipitate was washed out with 25 ml of ethanol. The amount of ethanol should be such that the precipitate could be washed out. Centrifuge, then dissolve the precipitate with cyclohexane, the amount of cyclohexane should be just enough to dissolve the precipitate. Add 35ml of ethanol to the solution, the amount of ethanol should be such that the amount of precipitate is no longer increased, and the nanocrystalline BST precipitate will be produced at room t...

Embodiment 2

[0019] Example 2, will analyze pure grade white Ba(Ac) 2 1.5Mol / L, crystalline Sr(Ac) 2 1 / 2H 2 O 1mol / L, 10mL of distilled water, 5mol / L of sodium hydroxide, 2.0g of sodium oleate, 30mL of oleic acid, 20mL of butanol and 2.5mol / L of n-tetrabutyl titanate are added to a stainless steel hydrothermal kettle with a Teflon liner , and then gently moved to a hydrothermal furnace, heated at 100 ° C for 25h. The reacted mixed solution was naturally cooled to room temperature, the supernatant was removed, and the reaction precipitate was washed out with 30 ml of ethanol. The amount of ethanol should be such that the precipitate could be washed out. Centrifuge, then dissolve the precipitate with cyclohexane, the amount of cyclohexane should be just enough to dissolve the precipitate. Add 40ml of ethanol to the solution, and the amount of ethanol should be such that the amount of precipitates is no longer increased, and nanocrystalline BST precipitates are produced at room temperature...

Embodiment 3

[0022] Example 3, will analyze the white Ba(Ac) of pure grade 2 2.25Mol / L, crystalline Sr(Ac) 2 1 / 2H 2 O1.5mol / L, without CO 2 Add 15mL of distilled water, 6mol / L sodium hydroxide, 3.0g sodium oleate, 45mL oleic acid, 30mL butanol and 3.75mol / L n-tetrabutyl titanate into the stainless steel hydrothermal kettle with Teflon liner, and then gently Moved to a hydrothermal furnace and heated the reaction at 150°C for 18h. The reacted mixed solution was naturally cooled to room temperature, the supernatant was removed, and the reaction precipitate was washed out with 40 ml of ethanol. The amount of ethanol should be such that the precipitate could be washed out. Centrifuge, then dissolve the precipitate with cyclohexane, the amount of cyclohexane should be just enough to dissolve the precipitate. Add 45ml of ethanol to the solution, and the amount of ethanol should be such that the amount of precipitates is no longer increased, and nanocrystalline BST precipitates are produced a...

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Abstract

The invention discloses a method for preparing nanometer barium-strontium titanate powder, and aims to solve the technical problem that the barium-strontium titanate powder prepared by the conventional preparation method is big in grain size, uneven in grain size distribution and impure in crystal phase. The technical scheme comprises the following steps of: adding barium acetate, strontium acetate, tetrebutyl titanate, sodium oleate, oleic acid, normal butyl alcohol and sodium hydroxide in a hydrothermal kettle, heating the materials to react the materials, using ethanol to wash the mixture to obtain a precipitate, dissolving the precipitate in cyclohexane, adding ethanol into the mixed solution for reaction at room temperature to obtain a nanocrystalline BST precipitate, performing centrifugal separation of the nanocrystalline BST precipitate, using the ethanol to wash the residual oleic acid, and air-drying the precipitate at room temperature. In the invention, the barium-strontium titanate powder is prepared by a liquid-solid solution method, the grain size of the barium-strontium titanate powder by the method is reduced from 50 nanometers in the prior art to 10 to 25 nanometers, the grain size distribution is uniform, and the crystal phase purity is also improved.

Description

technical field [0001] The invention relates to a method for preparing barium strontium titanate (hereinafter referred to as BST) powder, in particular to a method for preparing nano barium strontium titanate powder. Background technique [0002] Ferroelectric thick film material is a new type of low-cost dielectric tuning material, which can not only work in the radio frequency band, but also has a certain ability to resist adverse electromagnetic environments. Its advantages are: on the one hand, the thickness of thick film materials has been greatly reduced compared with bulk materials, and the required driving voltage is also greatly reduced, which can be used in microwave circuit design; on the other hand, thick film materials have lower surface stress than thin film materials , The dielectric properties and anti-aging ability of the material are guaranteed, which improves the survivability of the phase shifter in adverse electromagnetic environments. Barium strontium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00B82B3/00
Inventor 樊慧庆符云飞
Owner 江苏晨朗电子集团有限公司
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