Patent ID: 6461532
Filing Date: 2002-10-08
Classification: C04B,H01L

Abstract:
A method comprising operating a piezoelectric device in the thickness shear vibration mode, wherein the piezoelectric device comprises a piezoelectric ceramic material comprising a bismuth layer compound containing MII, Bi, Ti and O wherein MII is at least one element selected from the group consisting of Sr, Ba and Ca, and containing MIIBi4Ti4O15 type crystals, wherein MII is represented by the formula: SrxBayCaz wherein x, y and z representing the atomic proportions of Sr, Ba and Ca, respectively, satisfy x+y+z=1, 0&lE;x&lE;1,0&lE;y&lE;0.9,and 0&lE;z&lE;1,said piezoelectric ceramic material further comprising a lanthanoid oxide wherein Ln represents the lanthanoid, and the atomic ratio Ln/(Ln+MII) is in the range: 0II)<0.5.