Piezoelectric ceramic and method of manufacturing the same

Details Piezoelectric ceramic and method of manufacturing the same Piezoelectric ceramic and method of manufacturing the same

2007-03-13

2009-10-06

Budd, Mark (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S324000, C310S330000, C252S06290R

Reexamination Certificate

active

07598659

ABSTRACT:
A piezoelectric/electrostrictive device which exhibits an excellent piezoelectric characteristic and which has only a small dependence on a temperature is provided. The piezoelectric/electrostrictive device includes a piezoelectric/electrostrictive portion made of a piezoelectric ceramic, and electrodes electrically connected to the piezoelectric/electrostrictive portion. The piezoelectric ceramic reversibly transits to a tetragonal phase and an orthorhombic phase at a phase transition point as a boundary. The piezoelectric/electrostrictive portion is formed by a polarization treatment performed under the conditions that a treatment temperature ranges from a first temperature which exceeds the phase transition point of the piezoelectric ceramic to a second temperature which is 50° C. higher than the first temperature.

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