Compositions – Piezoelectric – Lead – zirconium – titanium or compound thereof containing
Patent
1995-11-29
1998-08-04
Bell, Mark L.
Compositions
Piezoelectric
Lead, zirconium, titanium or compound thereof containing
501135, 501136, C04B 3546
Patent
active
057888760
ABSTRACT:
A lanthanum-lead-zirconium-titanium perovskite having the general composition Pb.sub.1-a La.sub.a (Mg.sub.x/2 W.sub.x/2)Ti.sub.y Zr.sub.z O.sub.3, wherein 0.01.ltoreq.a.ltoreq.0.05, 0.01.ltoreq.x.ltoreq.0.06, 0.4.ltoreq.y.ltoreq.0.5, 0.4.ltoreq.x.ltoreq.0.5, and x+y+z=1, which is doped with 0.5-2 mol % MnO.sub.2, has very good hard piexoelectric properties, for example a low loss factor tan .delta. and a high quality factor. This perovskite does not degrade under direct-current conditions. Since it has low sintering temperatures, it can be used to manufacture multilayer actuators having hard piexoelectric properties. A piezoelectric ceramic composition comprising such a perovskite can very suitably be used for hard multilayer actuators.
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Bell Mark L.
Spain Norman N.
Troilo Louis M.
U.S. Philips Corporation
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