Piezoelectric device

Details Piezoelectric device Piezoelectric device

2007-11-30

2009-10-20

Leung, Quyen P (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

Reexamination Certificate

active

07605522

ABSTRACT:
A piezoelectric device is formed by simultaneously firing a piezoelectric ceramic mainly composed of a perovskite complex oxide represented by general formula ABO3and electrodes mainly composed of copper. The piezoelectric ceramic is represented by Pbα−aMea[(MII1/3MV(2+b)/3)zTixZr1−x−z]O3(wherein Me represe element, MIIis an acceptor element which is a divalent metal element, and MVis a donor element which is a pentavalent metal element), and satisfies equations 0.05≦z≦0.40, 0<bz/3≦0.035, 0.345≦x≦0.480, 0.965≦α≦1.020, and 0≦a≦0.05. In other words, the B sites contain excessive donors, and thus a piezoelectric device having good piezoelectric characteristics can be obtained even in the cases where a base metal material mainly composed of inexpensive copper is used as the internal electrode material.

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Official communication issued in the International Application No. PCT/JP2006/308564, mailed on Jul. 18, 2006.
Official communication issued in counterpart Chinese Application No. 200680019707.0, mailed on Feb. 13, 2009.

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