Piezoelectric ceramics and their production methods

Details Piezoelectric ceramics and their production methods Piezoelectric ceramics and their production methods

1992-05-26

1993-06-22

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

252 629, H01L 4110, C04B 3549

Patent

active

052218724

ABSTRACT:
A piezoelectric ceramic comprising at least two kinds of ceramic domains that are different from each other either in composition or in piezoelectric characteristics. It is made possible to produce a piezoelectric ceramic with better piezoelectric characteristics than that composed of a single kind of ceramic domain by having the compositions or the piezoelectric characteristics of each ceramic domain properly selected. For example, it is possible to obtain a piezoelectric ceramic of an extremely small rate of change in resonance frequency in response to a change in temperature by having a ceramic domain with a positive rate of change in resonance frequency in response to a change in temperature and the one with a negative rate of change in resonance frequency in response to a change in temperature combined.

REFERENCES:
patent: 4019915 (1977-04-01), Miyauchi et al.
patent: 4675123 (1987-06-01), Tsunooka et al.
patent: 4917810 (1990-04-01), Tsunooka et al.
patent: 4977547 (1990-12-01), Giniewicz et al.
patent: 5169551 (1992-12-01), Tsunooka et al.

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