| 摘要 |
A lead-free piezoelectric ceramic composition is composed of a main component represented by the general formula (Sr1-xM1x)Bi2(Nb1-yWy)2O9, wherein M1 is one of divalent metals other than Sr and trivalent metals other than Bi, 0<x<=0.3, and 0<y<=0.3. Examples of the divalent metals and trivalent metals include Ca, Ba, Mg, La, Ce, Pr, Nd, Sm, Gd, Dy, Er, Yb, Sc and Y. The piezoelectric ceramic composition can be sintered at a relatively low temperature of 1,100° C. or less, and has an electromechanical coupling coefficient kt which is at a practical level. The piezoelectric ceramic composition may be used in piezoelectric ceramic filters, piezoelectric ceramic oscillators and piezoelectric ceramic vibrators.
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