Preparation method of Barium Titanate nano-powder

Abstract

The invention provides a preparation method of Barium Titanate nano-powder, which comprises the following steps that: soluble barium salt is added into H2O2 solution to be mixed continuously, the pH value of the solution is adjusted with ammonia water, and the mixed solution is held statically, filtered, washed and vacuum-dried to obtain a precursor BaO2. H2O2 powder; then the BaO2.H2O2 and H2TiO3 are mixed and ground, KOH and KNO3 are added to be used as a flux, then absolute ethyl alcohol is added for grinding, the ultrasonic treatment on the mixed ground powder is undertaken, and after being dried and removed ethanol, the mixture is dissolved with deionized water, centrifugally separated and washed with deionized water after being roasted and cooled; and finally the sample is put into thin HNO3 solution to be immersed so as to remove the foreign matters, and the sample is centrifugally separated, washed and dried to obtain the barium titanate powder with the granularity of about 15 to 40 nm. The barium titanate powder prepared with the method has the advantages of small power granularity, uniform particles, low roasting temperature, simple production process, safe production process, difficult accumulation of the product particles, high purity of the product, high production efficiency and low implementation cost, and can be widely used for the preparation of different inorganic nano functional materials.

Description

technical field [0001] The invention relates to a preparation method of an inorganic functional nanometer material. Background technique [0002] Barium titanate is an important electronic ceramic material with perovskite structure, which has high relative permittivity, low dielectric loss and excellent piezoelectric, ferroelectric, withstand voltage and insulating properties. It can be widely used in electro-optic devices, ferroelectric detectors, capacitors and other electronic components as heat-sensitive materials, ferroelectric materials and capacitor materials. Therefore, the preparation of ultrafine barium titanate powder has aroused great interest. focus on. At present, the main methods for preparing barium titanate powder include high-temperature solid-phase method, sol-gel method, chemical co-precipitation method and hydrothermal method, etc., but each of these methods has some disadvantages: the high-temperature solid-phase method has a high synthesis temperature...

AI Technical Summary

Problems solved by technology

At present, the main methods for preparing barium titanate powder include high-temperature solid-phase method, sol-gel method, chemical co-precipitation method and hydrothermal method, etc., but each of these methods has some disadvantages: the high-temperature solid-phase method has a high synthesis temperature, and the obtained The powder has severe hard agglomeration, large particle size, and wide particle size distribution. Due to uneven mixing, the chemical composition of the product is uneven and the purity is low; the raw materials of the sol-gel method are expensive, and the organic solvent used is toxic. The powder is quickly agglomerated, the operating conditions are strict and difficult to control; the chemical co-precipitation method has improved the uniformity of the reaction compared with the high-temperature solid-phase method, but the calcination temperature is still high, and the product particle size is large and the particle size distribution is wide; hydrothermal method production High pressure, high requirements for production equipment, also has the disadvantages of serious particle agglomeration and uneven particle size distribution

The above methods may have the defects of low product purity, difficult to remove impurities, complex process and difficult control, or serious product particle agglomeration, large particles and wide particle size distribution.

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