Bismuth ferrite-barium titanate binary high-temperature piezoelectric ceramic material as well as preparation method and application thereof

Abstract

The invention provides a bismuth ferrite-barium titanate binary high-temperature piezoelectric ceramic material as well as a preparation method and application thereof, which belongs to the technical field of high-temperature piezoelectric materials. According to the method, the bismuth ferrite-barium titanate coarse powder and the bismuth ferrite-barium titanate fine powder with the particle size difference of 700 nm-1.2 mum are used as raw materials, the bismuth ferrite-barium titanate is prepared by using the mixed powder with different particle sizes, and due to the fact that the surface tension of large particles and small particles is larger than that of the same particles when the large particles and the small particles are in contact, growth of crystal grains is better facilitated, the relative density of the ceramic material is increased, the porosity is reduced, the dielectric constant and piezoelectric coefficient of the ceramic material are further improved, the dielectric property is improved, the dielectric loss tandelta is reduced, the insulating property of the ceramic is improved, the leakage current is reduced, and the ceramic material has excellent piezoelectric property. The result of the embodiment shows that the piezoelectric constant of the bismuth ferrite-barium titanate binary high-temperature piezoelectric ceramic material prepared by the preparation method disclosed by the invention reaches 200 pC / N.

Description

technical field [0001] The invention relates to the technical field of high-temperature piezoelectric materials, in particular to a bismuth ferrite-barium titanate binary high-temperature piezoelectric ceramic material and a preparation method and application thereof. Background technique [0002] The main research systems in high temperature piezoelectric materials are Pb(Zr x Ti 1-x )O 3 (x=0.52) represents lead-based piezoelectric ceramics, niobate-based lead-free piezoelectric ceramics, and various bismuth layered structures. Among them, lead zirconate titanate PZT ceramics is the most mature in the research of all piezoelectric ceramics, and it is also the most widely used in practice. However, one disadvantage of PZT piezoelectric ceramics is that the Curie temperature Tc is generally less than 400°C, which limits its application in high temperature fields. At the same time, lead-based materials will pollute the environment during production, use and disposal, and ...

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Problems solved by technology

BF-BT ceramics are similar to lead-based piezoelectric ceramic systems, and have excellent piezoelectric and ferroelectric properties when the components are located near the quasi-isomorphic phase boundary (MPB), but due to the presence of Bi in BF-BT ceramics during sintering 2 o 3 volatilization and Fe 3+ Phenomena such as the price change of ceramic samples lead to problems such as high defect ion concentration, high dielectric loss tanδ, and low piezoelectric properties, which greatly limit its application in piezoelectric devices.

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