Low-loss sodium potassium niobate-based lead-free piezoelectric ceramic material and preparation method thereof

Abstract

The invention discloses a low-loss sodium potassium niobate-based lead-free piezoelectric ceramic material and a preparation method thereof. The low-loss sodium potassium niobate-based lead-free piezoelectric ceramic material contains a perovskite ferroelectric (K0.5-xNa0.5+x)NbO3, a cosolvent LiSbO3 and a composite ferroelectric (ferromagnet) Bi(FetMn1-t)O3. The low-loss sodium potassium niobate-based lead-free piezoelectric ceramic material has a general formula of (1-y-z)(K0.5-xNa0.5+x)NbO3-yLiSbO3-zBi(FetMn1-t)O3, wherein x is greater than 0 and less than 0.5; y is greater than 0 and less than 0.1; z is greater than 0 and less than 0.1; and t is greater than 0 and less than 1. Through selection of appropriate values of x, y, z and t and appropriate technological parameters, the low-loss sodium potassium niobate-based lead-free piezoelectric ceramic material which is novel is prepared by a traditional ceramic product making technology. The low-loss sodium potassium niobate-based lead-free piezoelectric ceramic material has the advantages of good compactness, low dielectric loss, good piezoelectric performance, high Curie temperature, good piezoelectricity thermostability, stable preparation technology which is a traditional technology, and low sintering temperature of 1050 to 1130 DEG C.

Description

technical field [0001] The invention belongs to perovskite structure lead-free piezoelectric ceramics, in particular to low-loss potassium sodium niobate-based lead-free piezoelectric ceramics and a preparation method thereof. Background technique [0002] Since the discovery of the piezoelectricity of barium titanate ceramics in the 1940s, especially lead zirconate titanate Pb(Ti,Zr)O with excellent piezoelectric properties and high Curie temperature 3 After the successful development of (PZT), piezoelectric ceramics and piezoelectric ceramic devices have been widely used in industry, especially in the field of information industry. However, in lead-based piezoelectric ceramic materials, PbO or Pb 3 o 4 The content of lead-containing devices accounts for about 70% of the total raw materials, and these lead-containing devices cause serious harm to humans and the ecological environment during production, use and disposal. In recent years, developed countries such as Euro...

AI Technical Summary

Problems solved by technology

In addition, in recent years, various modification studies have been carried out on potassium sodium niobate-based ceramics, such as flux modification, doping modification, process modification, etc., but the comprehensive properties of the obtained materials are not ideal. Yes: the loss is large, or the Curie temperature is too low, or the cost is too high, such as Y.Saito et al. The texture method prepared KNN ceramics comparable to lead-based piezoelectric ceramics, but the process is quite complicated and the production cost is very high. High, difficult for industrial production

[0004] There are more or less certain problems in the above lead-free piezoelectric ceramic systems, and there is still a large distance from practical application.