Preparation method of tetragonal-phase barium titanate (BaTiO3) hollow nanocrystal

A technology of phase barium titanate and hollow nanocrystals, which is applied in the field of preparation of tetragonal phase barium titanate hollow nanocrystals, can solve problems such as difficulty in controlling particle size and shape, affecting the electrical properties of electronic components, and coarse powder particles. Achieve the effects of easy control of process conditions, easy scale production, and simple process

Active Publication Date: 2013-01-23
ZHEJIANG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The traditional method of preparing tetragonal barium titanate mainly adopts high-temperature solid-phase method, but the prepared powder has coarse particles, poor surface activity, severe agglomeration, and composition segregation, and it is difficult to control the size and shape of the particles, which will eventually greatly affect the electron density. Electrical properties of components

Method used

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  • Preparation method of tetragonal-phase barium titanate (BaTiO3) hollow nanocrystal
  • Preparation method of tetragonal-phase barium titanate (BaTiO3) hollow nanocrystal

Examples

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example 1

[0021] 1) Add deionized water, ethylenediamine and hydrochloric acid to tetrabutyl titanate, the molar ratio of tetrabutyl titanate, deionized water, ethylenediamine and hydrochloric acid is 1:260:0.3:0.03 under normal pressure and Stir at 80° C. for 6 hours, control the pH value of the reactant to 2, and obtain a titanium-containing water-soluble sol.

[0022] 2) Measure and weigh barium acetate according to the molar ratio of barium acetate and tetrabutyl titanate of 3:1, add barium acetate into deionized water, and stir well to form an aqueous solution of barium acetate;

[0023] 3) Dissolve potassium hydroxide in deionized water, add the aqueous solution of barium acetate prepared in step 2) to the aqueous potassium hydroxide solution, and then add it to the titanium-containing water-soluble sol in step 1), to obtain a solution containing barium and titanium Suspension of oxyhydroxide precipitates;

[0024] 4) Transfer the precipitated suspension containing barium and tit...

example 2

[0027] 1) Add deionized water, acetylacetone and nitric acid to tetrabutyl titanate, the molar ratio of tetrabutyl titanate, deionized water, acetylacetone and nitric acid is 1:280:0.37:0.04. Stir at normal pressure and 60° C. for 10 hours, control the pH value of the reactant to 3, and obtain a titanium-containing water-soluble sol.

[0028] 2) Measure and weigh barium acetate according to the molar ratio of barium acetate and tetrabutyl titanate of 3:1, add barium acetate into deionized water, and stir well to form an aqueous solution of barium acetate;

[0029] 3) Dissolve potassium hydroxide in deionized water, add the aqueous solution of barium acetate prepared in step 2) to the aqueous potassium hydroxide solution, and then add it to the titanium-containing water-soluble sol in step 1), to obtain a solution containing barium and titanium Suspension of oxyhydroxide precipitates;

[0030] 4) Transfer the obtained suspension containing precipitated oxyhydroxides containing...

example 3

[0033] 1) Add deionized water, acetylacetone and hydrochloric acid to tetrabutyl titanate, the molar ratio of tetrabutyl titanate, deionized water, acetylacetone and hydrochloric acid is 1:210:0.45:0.01. Stir at normal pressure and 50° C. for 24 hours, control the pH value of the reactant to 3, and obtain a titanium-containing water-soluble sol.

[0034] 2) Measure and weigh barium acetate according to the molar ratio of barium acetate and tetrabutyl titanate of 3:1, add barium acetate into deionized water, and stir well to form an aqueous solution of barium acetate;

[0035] 3) Dissolve potassium hydroxide in deionized water, add the aqueous solution of barium acetate prepared in step 2) to the aqueous potassium hydroxide solution, and then add it to the titanium-containing water-soluble sol in step 1), to obtain a solution containing barium and titanium Suspension of oxyhydroxide precipitates;

[0036] 4) Transfer the obtained suspension containing precipitated oxyhydroxide...

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Abstract

The invention discloses a preparation method of a tetragonal-phase barium titanate (BaTiO3) hollow nanocrystal. The preparation method comprises the following steps of: using barium acetate and tetrabutyl titanate as raw materials, adding deionized water, adding potassium hydroxide of an appropriate amount to promote crystallization, and carrying out hydrothermal reaction at the temperature of 110-240 DEG C so as to prepare the tetragonal-phase barium titanate (BaTiO3) hollow nanocrystal. The preparation method is simple in technical process, easy in control, low in cost and easy in scale production. The prepared product is high in purity, good in crystallinity, good in dispersivity and narrow in particle size distribution. The product has wide application prospects in the fields of microelectronic devices, high-capacity capacitors, sensors, storage materials, piezoelectric ceramics, filters and the like.

Description

technical field [0001] The invention relates to a method for preparing tetragonal barium titanate hollow nanocrystals, belonging to the field of inorganic non-metallic materials. Background technique [0002] The performance of functional materials depends largely on their morphology, size and crystallinity, and the control of microscopic morphology is of great value to the application of materials. Nanomaterials have better physical and chemical properties than bulk materials, and the advancement of science and technology and the miniaturization of electronic devices have also put forward more and more requirements for the nanoscale of materials. Therefore, controlling the morphology of nanomaterials has become a hot spot of attention and research in materials science in recent years. [0003] Barium titanate BaTiO 3 It is a widely used ferroelectric and piezoelectric ceramic material, mainly used in the production of electronic components such as high dielectric cera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/624
Inventor 韩高荣杨鑫徐刚任召辉魏晓刘涌沈鸽
Owner ZHEJIANG UNIV
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