PIEZO CERAMIC COMPOSITION

摘要

The piezoelectric ceramic compsn. is charactrized by replacing some pb of pb (CO1/3Nb2/3)O3-(pbTiO3)-(pbZrO3) with Sr and adding a little WO3 and MnCO3. The ceramic has the compsn. of equation (pb1-aSra) [x(Co1/3Nb2/3)-y(Ti)- Z(Zr) O3 + mWO3 + nMnCO3 (where x,y,z are respectively 0.01 <= x <= 0.02, 0.30 <= y <= 0.60 and Z=1-x-y in mole ratio, and a,m,n are also respetively 0 < a <= 0.5, 0 < m <= 0.025 and 0 < n <= 0.02). The ceramic has a high piezoelectric constant and a low dielectric loss, is used for ultrasonic vibrators.