Preparation method of submicron-scale barium titanate powder

Abstract

The invention discloses a preparation method of submicron-scale barium titanate powder, wherein the preparation method includes the steps of 1) employing metatitanic acid being more than 98.5% in purity and less than 80 nm in particle size; 2) performing high-effective grinding to the metatitanic acid with barium carbonate to disperse the powder until specific surface is 50-150 m<2> / g, wherein the ratio of barium to titanium is 0.998-1.002, and calcining the powder to prepare barium titanate powder; and 3) synthesizing the barium titanate powder through a quick thin-layer calcination method. The calcination method is mainly used for controlling the mass of material in unit area, wherein the unit area mass is less than 1 g / cm<2>, temperature increasing rate of calcination is 6-55 DEG C / min, calcination temperature is 900-1050 DEG C and temperature maintaining time is 1-3 h. The barium titanate powder has uniform particles and good dispersibility, is 120-300 nm in average particle size, has a high tetragonal crystal property, and is more than 1.009 in c axis / a axis value through X-ray diffraction analysis.

Description

technical field [0001] The invention belongs to the field of material chemistry, and in particular relates to a preparation method of submicron barium titanate powder. Background technique [0002] Barium titanate powder (BaTiO 3 ) are widely used in the dielectric layer of multilayer ceramic capacitors. Multilayer ceramic capacitors (MLCC) are gradually developing towards miniaturization, high capacity, high reliability and low cost. This development trend inevitably requires thinning of the dielectric layer. Therefore, the requirements for barium titanate materials are getting higher and higher, and submicron barium titanate powders with good dispersion, strong particle uniformity and high crystallinity have gradually become the new favorite of the industry. [0003] For the synthesis method of perovskite structure barium titanate powder, currently known mainly include hydrothermal method, hydrolysis method, solid phase synthesis method, oxalate method, citric acid metho...

AI Technical Summary

Problems solved by technology

However, in the traditional solid-state reaction method, the raw material titanium oxide itself has agglomeration. When mixing with barium carbonate, it is necessary to open the agglomeration of titanium oxide itself and mix it with barium carbonate. Therefore, it is difficult to obtain a homogeneous mixture under certain mixing conditions. body

The solid-phase method of barium titanate will have problems such as large particles, uneven distribution, and serious agglomeration, and it is difficult to obtain submicron-sized, high-crystallinity barium titanate powder

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