Piezoelectric ceramic composition and piezoelectric ceramic

Compositions – Piezoelectric

Reexamination Certificate

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C501S134000

Reexamination Certificate

active

07959823

ABSTRACT:
A piezoelectric ceramic composition including potassium-sodium-lithium niobate, bismuth-sodium titanate and bismuth ferrate is provided. A piezoelectric ceramic obtained by firing the piezoelectric ceramic composition, wherein the electromechanical coupling factor is high, the piezoelectric g33constant, in particular, is large, the second phase transformation does not exist in the temperature range of −40 to 150° C. in at least one of a temperature-dependent variation of a resonance frequency, a temperature-dependent variation of an anti-resonance frequency and a temperature-dependent variation of piezoelectric g33constant, and a good heat-resistant property is obtained, is provided.

REFERENCES:
patent: 11-228226 (1999-08-01), None
patent: 11-228228 (1999-08-01), None
patent: 2000-128632 (2000-05-01), None
patent: 2000-272963 (2000-10-01), None
patent: 2001-240471 (2001-09-01), None
patent: 2001-316182 (2001-11-01), None
patent: 2002-255641 (2002-09-01), None
patent: 2003-012371 (2003-01-01), None

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