Potassium-sodium niobate and sodium lithium bismuth titanate-system lead-free piezoelectric ceramic composition

Abstract

The invention provides potassium-sodium niobate and sodium lithium bismuth titanate-system lead-free piezoelectric ceramic, relating to a novel multicomponent-system lead-free piezoelectric ceramic composition, and belonging to the field of perovskite structures piezoelectric ceramic. The composition provided by the invention can be represented by a general formula of (1-z)(K1-xNax)NbO3-zBi0.5(Nal-yLiy)0.5TiO3, wherein x and y are both more than 0 and less than 1, and z is more than 0 and less than or equal to 0.06. The lead-free piezoelectric ceramic composition also can contain one or more oxides and has the general formula of (1-z)(K1-xNax)NbO3-zBi0.5(Nal-yLiy)0.5TiO3+aMalphaObeta (mol%), wherein the MalphaObeta is one or more doped oxides, the mole ratio of the content a to the main component (1-z)(K1-xNax)NbO3-zBi0.5(Nal-yLiy)0.5TiO3 is 0-3%, and M is an element which ranges from univalence to hexavalence and can form solid oxide with oxygen. The optimal piezoelectric constant d33 of the piezoelectric ceramic composition of the system can be more than 200pC/N, and the electromechanical coupling factors kp and kt can be more than 40%; the process is stable, and a traditional piezoelectric ceramic preparation technology and industrial raw materials are adopted to prepare the ceramic composition so that practicality is achieved.

Description

1. Technical field [0001] The invention belongs to the field of perovskite structure piezoelectric ceramics, and relates to a new type of multi-element niobate lead-free piezoelectric ceramic composition, in particular to a class of sodium niobate potassium bismuth titanate lithium lead-free piezoelectric ceramic composition thing. 2. Background technology [0002] Since the mid-1940s, the piezoelectricity of barium titanate ceramics was discovered, especially lead zirconate titanate Pb(Ti, Zr)O with excellent piezoelectric properties and high Curie temperature 3 After the successful development of ceramics, the structural feature is ABO 3 The research and development of lead-based perovskite piezoelectric ceramics is very active. Piezoelectric ceramics and piezoelectric ceramic devices have been widely used in industry, especially in the field of information industry. With (Pb(Ti, Zr)O 3 ) as the representative lead-based binary system and lead zirconate titanate (Pb(Ti,...

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Problems solved by technology

Traditional ceramic technology cannot produ...