Piezoelectric ceramic composition

Details Piezoelectric ceramic composition Piezoelectric ceramic composition

1994-11-30

1996-06-18

Green, Anthony

Compositions

Piezoelectric

252 629PZT, 501135, 501136, C04B 3548

Patent

active

055274811

ABSTRACT:
A piezoelectric ceramic composition by which it is possible to obtain piezoelectric ceramic chip parts having a high electromechanical coupling factor and a high heat-resistance property, and also having a good temperature coefficient of resonance frequency while maintaining the high heat-resistance property and low change over time. The piezoelectric ceramic compositions of the present invention include: (1) a first piezoelectric ceramic composition expressed by the general formula Pb.sub.y [(Mg.sub.1/3 Nb.sub.2/3).sub.a (Yb.sub.1/2 Nb.sub.1/2).sub.b Ti.sub.c Zr.sub.d ]O.sub.3 (where a+b+c+d=1), wherein 0.95.ltoreq.y.ltoreq.1.05, 0.01.ltoreq.a.ltoreq.0.15, 0.01.ltoreq.b.ltoreq.0.10, 0.30.ltoreq.c.ltoreq.0.60, and 0.25.ltoreq.d.ltoreq.0.55; (2) a second piezoelectric ceramic composition expressed by the general formula

REFERENCES:
patent: 5300852 (1994-04-01), Isogai et al.

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