Bismuth sodium, barium titanate, strontium titanate, calcium titanate based lead-free piezoelectric ceramics

Abstract

The invention relates to a lead-free piezoelectric ceramic of bismuth sodium barium strontium calcium titanate, relates to a novel multi-element lead-free piezoelectric ceramic composition, and belongs to the field of perovskite structure-environment coordination piezoelectric ceramics. The lead-free piezoelectric ceramic that the present invention proposes can use general formula (1-z) Bi (1-w) Na w TiO 3 +z(Ba 1-x-y Sr x Ca y )TiO 3 +aM α o β (wt%), where 0<x<1, 0<y<1, 0<z<1, 0<(x+y)<1, 0.3≤w≤0.7, M α o β It is one or more doped oxides whose content a accounts for the main component (1-z) Bi (1-w) Na w TiO 3 +z(Ba 1-x-y Sr x Ca y )TiO 3 The weight ratio is 0-10%, M is an element with a valence of +1-+6 and can form a solid oxide with oxygen, such as Na, K, Li, Ni, Zn, Cr, Co, Nb, Ta, Al, Cu , Fe, Ce, Pr, Nd, Sm, Gd, Dy, Er, Yb, In, Y, Sc, La, Ho, Lu, Sn, Sb, Mn, Ca, Ba, Sr, Mg, Si, etc., α and β denotes the number of atoms of the corresponding element M and oxygen in the relevant oxide, respectively. The system piezoelectric ceramic composition d 33 Up to 160pC / N or more, k p It can reach more than 30.0%, its process is stable, it can be obtained by using traditional piezoelectric ceramic preparation technology and industrial raw materials, and it has practicability.

Description

1. Technical field [0001] The invention relates to a novel multi-component lead-free piezoelectric ceramic composition, which belongs to the field of piezoelectric ceramics with perovskite structure and environment coordination. 2. Background technology [0002] Since the discovery of the piezoelectricity of barium titanate ceramics in the mid-1940s, the structural characteristics are ABO 3 The research and development of piezoelectric ceramics is very active. Piezoelectric ceramics and their components have been widely used in industry, especially in the field of information industry. Lead zirconate titanate (Pb(Ti, Zr)O 3 ) as the representative lead-based binary system, the A site is Pb; the B site is Ti, Zr and lead magnesium niobate-lead titanate [Pb(Mg 1 / 3 Nb 2 / 3 )O 3 -PbTiO 3 ] as the base material, add the third component, such as lead magnesium niobate (Pb (Mg 1 / 3 Nb 2 / 3 )O 3 ) as a representative, the A position is Pb, and the B position is Mg 1 / 3 Nb 2 / 3 ...

AI Technical Summary

Problems solved by technology

Simple Bi 0.5 Na 0.5 TiO 3 Ceramic coercive field is extremely large (73Kv / cm), polarization is difficult, and it is difficult to be practical, so Bi 0.5 Na 0.5 TiO 3 Modification to obtain lead-free piezoelectric ceramic system with low coercive field and good piezoelectric ferroelectric performance