Hollow spherical strontium titanate powder and preparation method thereof

A hollow spherical, strontium titanate powder technology, used in titanate, alkaline earth metal titanate, chemical instruments and methods, etc., can solve the problem of uneven powder quality and size, difficult to control particle morphology, high energy consumption, etc. problems, to achieve the effects of easy semiconducting, easy doping modification, and high photocatalytic efficiency

Inactive Publication Date: 2017-10-24
GUANGZHOU AURORA TECHNOLOGIES CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The solid-phase method is currently the most used method in the industry. This method has cheap raw materials, simple operation, and wide application. H

Method used

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  • Hollow spherical strontium titanate powder and preparation method thereof
  • Hollow spherical strontium titanate powder and preparation method thereof

Examples

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Embodiment 1

[0026] Add 1.0ml of ammonia water with a mass fraction of 25% in 300ml of absolute ethanol, add dropwise 4.4ml of tetrabutyl phthalate under magnetic stirring, age for 24 hours, centrifuge, and dry to obtain a titanium-containing precursor with a thickness of 800-810nm. Then weigh 0.2g of precursor and 0.508g of strontium nitrate, pour it into the inner lining of the reaction kettle, add 20ml of water and a certain amount of 0.8g / mL sodium hydroxide solution to make the pH equal to 14, stir for 15 minutes and place it at 185 Hydrothermal reaction in an oven at ℃, take out the reaction vessel after 2.5 hours, and cool to room temperature naturally, wash the obtained powder alternately with deionized water and dilute acetic acid, filter with suction, and finally dry in an oven at 60℃ to obtain hollow spherical structure titanium For the strontium titanate powder, the inner diameter of the hollow spherical strontium titanate powder is 0.6-0.8 μm, and the outer diameter of the holl...

Embodiment 2

[0028] Add 1.0ml of ammonia water with a mass fraction of 25% in 300ml of absolute ethanol, add 4.4ml of tetrabutyl phthalate dropwise under magnetic stirring, age for 22 hours, centrifuge, and dry to obtain a titanium-containing precursor of about 780-800nm . Then weigh 0.21g of precursor and 0.501g of strontium nitrate, pour it into the inner lining of the reaction kettle, add 20ml of water and a certain amount of 0.8g / mL sodium hydroxide solution to make the pH equal to 13.5, stir for 15 minutes and place it at 182 Hydrothermal reaction in an oven at ℃, take out the reaction vessel after 2.5 hours, and cool to room temperature naturally, wash the obtained powder alternately with deionized water and dilute acetic acid, filter with suction, and finally dry in an oven at 60℃ to obtain hollow spherical structure titanium For the strontium titanate powder, the inner diameter of the hollow spherical strontium titanate powder is 0.6-0.8 μm, and the outer diameter of the hollow sph...

Embodiment 3

[0030] Add 1.0ml of ammonia water with a mass fraction of 25% in 300ml of absolute ethanol, add 4.4ml of tetrabutyl phthalate dropwise under magnetic stirring, age for 18 hours, centrifuge, and dry to obtain a titanium-containing precursor of about 800-820nm . Then weigh 0.18g of precursor and 0.516g of strontium nitrate, pour it into the lining of the reaction kettle, add 20ml of water and a certain amount of 0.8g / mL sodium hydroxide solution to make the pH equal to 13.8, stir for 15 minutes and place it at 180 Hydrothermal reaction in an oven at ℃, take out the reaction vessel after 2.5 hours, and cool to room temperature naturally, wash the obtained powder alternately with deionized water and dilute acetic acid, filter with suction, and finally dry in an oven at 60℃ to obtain hollow spherical structure titanium For the strontium titanate powder, the inner diameter of the hollow spherical strontium titanate powder is 0.6-0.8 μm, and the outer diameter of the hollow spherical...

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Abstract

The invention provides a hollow spherical strontium titanate powder, the inner diameter of the hollow spherical strontium titanate powder is 0.6-0.8 μm, and the outer diameter of the hollow spherical strontium titanate powder is 0.8-1.4 μm; The preparation method of the hollow spherical strontium titanate powder comprises the following steps: (1) preparation of a precursor: hydrolyzing tetrabutyl titanate in ethanol or ethanol and ammonia water into an amorphous spherical titanium source precursor; (2) hollow Preparation of spherical powder: Weigh the precursor and strontium nitrate, pour it into the lining of the reaction kettle, add water and sodium hydroxide solution, stir for a period of time, seal it, and put it in an oven for hydrothermal reaction; (3) Cleaning of the powder Drying; the sodium hydroxide solution in the step (2) is used to adjust the pH value of the reaction system, and the mixed solution in the reaction system after the pH adjustment satisfies 13≤pH≤14. It has the characteristics of easier doping modification, easier semiconducting and higher photocatalytic efficiency.

Description

technical field [0001] The technical field of powder preparation by hydrothermal method of the present invention, in particular relates to a hollow spherical strontium titanate powder and a preparation method thereof. Background technique [0002] Strontium titanate (SrTiO3) is an important dielectric material with high dielectric constant and low dielectric loss. At present, the commonly used methods for preparing strontium titanate powder include solid-phase method and liquid-phase method. The solid-phase method is currently the most used method in the industry. This method has cheap raw materials, simple operation, and wide application. However, the quality and size of the obtained powder are not uniform, and the shape of the particles is difficult to control. Consumption, high pollution. The hydrothermal method in the liquid phase method can well control the crystal form and morphology by adjusting the hydrothermal conditions, and the requirements for equipment are sim...

Claims

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Application Information

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IPC IPC(8): C01G23/00B01J23/02B01J37/10
CPCC01G23/006B01J23/02B01J35/004B01J37/10C01P2004/03C01P2004/04C01P2004/34C01P2004/61C01P2004/62
Inventor 丁明建庄彤杨俊锋冯毅龙
Owner GUANGZHOU AURORA TECHNOLOGIES CO LTD
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