Sol-solvothermal method for preparing lead zirconate titanate piezoelectric aerogel

Abstract

The invention discloses a sol-solvothermal method for preparing lead zirconate titanate piezoelectric aerogel, and belongs to the technical field of functional materials. Firstly, the invention provides a uniform and transparent stable sol which is extremely difficult to gel at normal temperature and normal pressure and is prepared by modifying with acetylacetone without a reduced pressure distillation device. Secondly, the sol which is extremely difficult to gel at the normal-temperature and normal-pressure environment forms uniform, semitransparent and stable gel in a short time through external pressure and temperature rise. Thirdly, the high-quality PZT aerogel is efficiently and quickly prepared in a material-saving manner through supercritical drying. And finally, the PZT amorphous aerogel prepared by supercritical drying is annealed to obtain the high-strength PZT crystallized aerogel.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a method for rapidly preparing PZT piezoelectric electrogels through a method of applying pressure and increasing temperature, that is, a sol-solvothermal method. Background technique [0002] PZT ceramics, powders, films and aerogels are typical ABO 3 The perovskite structure multifunctional material is used to prepare electronic components such as sensors, transducers and memories. It is a promising functional material and is widely used in high-tech fields such as electronics, deep sea and aerospace. A lot of research has been done on PZT ceramics, powders and thin films at home and abroad, and many important progress have been made. [0003] PZT airgel not only inherits the excellent characteristics of PZT ceramics, powders and films, but also endows it with novel properties such as low density, large specific surface area and high sensitivity. Howe...

AI Technical Summary

Problems solved by technology

Due to the asynchronous hydrolysis reactions of the three elements of lead, zirconium, and titanium, it is necessary to add chelating agents or stabilizers such as acetylacetone or glacial acetic acid to the precursor solution to obtain a uniform, transparent and stable sol. gel

On the other hand, in order to prepare PZT airgel, it is necessary to obtain a gel or wet gel with a three-dimensional network structure. However, it is usually difficult to obtain the desired gel after modifying the sol with stabilizers such as acetylacetone and glacial acetic acid.

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