Rapid preparation method of perovskite structure polycrystalline nanopowder with chemical formula ca0.4sr0.6bi4ti4o15

Abstract

The invention relates to a preparation method of perovskite-structure polycrystalline nanopowder, in particular to a quick preparation method of perovskite-structure polycrystalline nanopowder with a chemical formula of Ca0.4Sr0.6Bi4Ti4O15. The invention aims to provide a quick preparation method of Ca0.4Sr0.6Bi4Ti4O15 powder; and the method has the advantages of simple technique and low cost, and the preparation process is convenient to operate and control. The aim of the invention is realized by the following technical scheme: acetylacetone, tetrabutyl titanate, strontium acetate, bismuth nitrate, calcium nitrate and ethylene glycol are used as raw materials and a sol-gel method is adopted for synthesis. The invention has the following beneficial effects: the particle size of the perovskite-structure high-purity superfine powder which is prepared directly and quickly is 1-10mu m, the particles are nearly spherical, the size distribution range is narrow and the components are uniform.

Description

technical field [0001] The invention relates to the preparation of a perovskite structure polycrystalline nanopowder, specifically a kind of chemical formula Ca 0.4 Sr 0.6 Bi 4 Ti 4 o 15 Rapid preparation method of polycrystalline nanopowder with perovskite structure. Background technique [0002] Ca 0.4 Sr 0.6 Bi 4 Ti 4 o 15 The material has a series of important properties such as ferroelectricity, piezoelectricity, pyroelectricity, electro-optic, acousto-optic and nonlinear optics, and has high remanent polarization, low coercive field strength and high Curie temperature , low dielectric loss and other advantages, it has broad application prospects in microelectronics, optoelectronics, integrated optics and microelectromechanical systems (MEMS). [0003] The synthesis of powders has become an important research field in chemistry and materials science, and the preparation of nanopowders with a certain particle size and narrow particle size distribution is partic...

AI Technical Summary

Problems solved by technology

The physical method has the advantages of easy amplification and automatic control, but the equipment is expensive, and it is difficult to accurately control the particle size and particle size distribution of nanopowders.

There are many factors affecting the chemical method, but the characteristics of the product may be tailored

[0004] The drying in the traditional sol-gel process is to expose to the atmosphere, or to evaporate and dry in an oven. A meniscus is formed due to the surface tension of the liquid. As the evaporation and drying progress, the meniscus recedes into the gel body, and the force acting on the pore wall increases, causing the skeleton of the gel to collapse, causing the gel to shrink into a Small volume of hard agglomerates, resulting in a powder with larger particles

Moreover, as the drying proceeds, the volatilization of the organic solvent becomes slower and slower, so the drying cycle of the powder is longer. According to the traditional drying method, the drying time of the powder is more than half a year, and the obtained is a plaster-like agglomerate.

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