Piezoelectric ceramic and piezoelectric element

Details Piezoelectric ceramic and piezoelectric element Piezoelectric ceramic and piezoelectric element

2011-06-21

2011-06-21

Dougherty, Thomas M (Department: 2837)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

Reexamination Certificate

active

07965020

ABSTRACT:
A piezoelectric ceramic which has a large value of coercive electric field and, in addition, which can be fired at low temperatures of 950° C. or lower, is provided. It has a composition represented by Pbx-a-dBiaM3d{M1b(M21/3Nb2/3)yZr1-b-y-zTiz}O3where M1 and M2 represent, independently, at least one of Ni and Zn, and M3 represents at least one of Ba and Sr, 0.05≦a≦0.15, 0<b≦0.075, 0≦(a−2b), 0≦d≦0.1, 0.97≦x≦1.00, 0.020≦y≦0.250, and 0.398≦z≦0.512. It is preferable that M1 represents Ni, and M2 represents at least one of Ni and Zn. Moreover, it is preferable that Ni is in the state of being segregated.

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