Preparation method of barium titanate nano-powder

A technology of nano-powder and barium titanate, which is applied in the field of material chemistry, can solve the problems of increasing grain size and achieve the effects of optimizing c/a ratio, reducing particle size, and high safety

Active Publication Date: 2021-04-27
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, titanium dioxide (TiO2) usually undergoes a phase transition between 650°C and 950°C with a significant increase in grain size

Method used

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  • Preparation method of barium titanate nano-powder
  • Preparation method of barium titanate nano-powder
  • Preparation method of barium titanate nano-powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] At room temperature, 0.08moL nano-TiO 2 The powder was evenly dispersed in 15mL deionized water, and stirred slowly to obtain TiO 2 water dispersion.

[0074] Under normal pressure nitrogen protection, 0.008moL Ba(OH) 2 Add 25mL of deionized water into a three-neck round bottom flask, stir at 100°C and condense and reflux until Ba(OH) 2 completely dissolved.

[0075] TiO 2 The aqueous dispersion was poured into the above-mentioned three-necked flask, and the temperature of the mixed solution was maintained at 100° C., and the stirring was continued for 4 hours. After the reaction is completed, part of the reaction solution is dried to obtain TiO with a shell-core structure. 2 slurry.

[0076] The above-mentioned TiO with core-shell structure 2 slurry with 0.072moL BaCO 3 The powders are mixed and efficiently ground and dispersed.

[0077] The above mixture was added at 0.2g / cm 2 The mass per unit area is spread in a muffle furnace, and calcined at 850°C for 2 ...

Embodiment 2

[0079] Other operating steps in embodiment 2 are consistent with embodiment 1, only change the amount of the substance of barium source, comprise Ba(OH) 2 0.01moL, BaCO 3 0.07moL, get BaTiO 3 Nano powder.

Embodiment 3

[0081] Other operating steps in embodiment 3 are consistent with embodiment 1, only change the amount of the substance of barium source, comprise Ba(OH) 2 0.02moL, BaCO 3 0.06moL, get BaTiO 3 Nano powder.

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Abstract

The invention provides barium titanate nano-powder as well as a preparation method and application thereof, and particularly discloses the following preparation method: 1) liquid-phase reaction: preparing a mixed aqueous solution of titanium dioxide and a first barium source, carrying out normal-pressure reaction at 70-120 DEG C, and conducting drying to obtain titanium dioxide slurry with a shell-core structure; and 2) solid-phase reaction: mixing the titanium dioxide slurry with the shell-core structure and a second barium source, and conducting calcining to obtain barium titanate nano-powder. The molar ratio of titanium dioxide to the first barium source in the step 1) is 1:x; the amount of substance of the second barium source in the step 2) is 1-x; the first barium source is one or a combination of more of barium hydroxide, barium nitrate and barium chloride; and the second barium source is one or a combination of more of barium carbonate, barium oxide and barium hydroxide. The preparation method does not generate waste gas and liquid, and is high in safety, low in equipment requirement and simple to operate.

Description

technical field [0001] The invention belongs to the field of material chemistry, and in particular relates to a method for preparing barium titanate nanopowder. Background technique [0002] Barium titanate (BaTiO 3 ) is widely used as the dielectric of various multilayer ceramic capacitors (MLCC) due to its relatively high room temperature dielectric coefficient and relatively low room temperature dielectric loss. In order to achieve a high degree of circuit integration, passive devices such as multilayer ceramic capacitors are gradually developing towards miniaturization. This development trend necessarily requires increasing the number of dielectric layers in multilayer ceramic capacitors within a limited volume and reducing the thickness of each layer. Thus, the preparation of BaTiO with submicron or even nanometer particle size 3 Powders are critical. [0003] Currently, the commercial BaTiO 3 The powder is mainly prepared by solid phase method, hydrothermal method...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C04B35/468C04B35/626
CPCC04B35/468C04B35/62605
Inventor潘鹏飞于淑会孙蓉
OwnerSHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI