Piezoelectric ceramic composition and piezoelectric actuator...

Details Piezoelectric ceramic composition and piezoelectric actuator... Piezoelectric ceramic composition and piezoelectric actuator...

2005-01-18

2005-01-18

Dougherty, Thomas M. (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C252S06290R, C252S06290R, C264S614000

Reexamination Certificate

active

06844661

ABSTRACT:
A piezoelectric ceramic composition comprises a composite perovskite type oxide of Pb(Ni1/3Nb2/3)O3and simple perovskite type oxides of PbTiO3and PbZrO3as main components. The composition range of the main components exists in an area surrounded by lines for connecting respective composition points, i.e., a point A (X=40, Y=37, Z=23), a point B (X=36, Y=37, Z=27), a point C (X=33, Y=40, Z=27), and a point D (X=37, Y=40, Z=23) in a triangular coordinate system defined by apexes of Pb(Ni1/3Nb2/3)O3, PbTiO3, and PbZrO3, provided that Pb(Ni1/3Nb2/3)O3amounts to X molar %, PbTiO3amounts to Y molar %, and PbZrO3amounts to Z molar %. The composition makes it possible to realize a large strain amount while suppressing the relative dielectric constant to be low. The composition is preferably usable for an piezoelectric actuator of an ink-jet head.

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