Sodium potassium niobate barium zirconate titanate series lead-free piezoelectric ceramic composition

Abstract

The present invention provides a novel potassium-sodium niobate zirconium barium titanate series leadless piezoelectric ceramic composition which comprises perovskite type piezoelectrics K<1-x>Na<x>NbO3 and strong ferroelectrics Ba(Ti<1-y>Zr<y>)O3, the general formula is represented by (1-z)(K<1-x>Na<x>)NbO3-zBa(Ti<1-y>Zr<y>)O3, in the formula 0<x<1, 0<y<1, 0<z<=0.1. The leadless piezoelectric ceramic composition can also comprises one or a plurality of oxides, the general formula is (1-z)(k<1-x>Na<x>)NbO3-zBa(Ti<1-y> Zr<y>)O3((100-a)mol%+M<alpha>O<beta>(amol%). The optimal value d33 of the system piezoelectric ceramic composition can up to above 230pC/N, kp can up to above 48%, and the kt can up to above 47%, has the advantages of good compactness, high Curie temperature, good thermal stability, being prepared with the conventional piezoelectric ceramic preparing technique and has practicability. 一种新型的铌酸钠钾锆钛酸钡系无铅压电陶瓷组合物，其包含钙钛矿型压电体K1-xNaxNbO3和强铁电体Ba(Ti1-yZry)O3，其通式用(1-z)(K1-xNax)NbO3-zBa (Ti1-yZry)O3来表示，式中0＜x＜1，0＜y＜1，0＜z≤0.1。该无铅压电陶瓷组合物还可以含有一种或多种氧化物，其通式为(1-z)(K1-xNax)NbO3-zBa(Ti1-y Zry)O3((100-a)mol％)+MαOβ(amol％)。该体系压电陶瓷组合物的最优值d33可达230pC/N以上，kp可达48％以上，kt可达47％以上，致密性好，居里温度高，热稳定性好，采用传统压电陶瓷制备技术制得，具有实用性。