Compositions – Piezoelectric
Reexamination Certificate
2006-12-19
2006-12-19
Koslow, C. Melissa (Department: 1755)
Compositions
Piezoelectric
C310S311000, C501S134000
Reexamination Certificate
active
07150838
ABSTRACT:
This invention provides a piezoelectric ceramic composition that does not contain lead, can be sintered at a normal pressure and has a high electro-mechanical coupling coefficient and a small dielectric loss, its production method, and a piezoelectric device utilizing the piezoelectric ceramic composition. The invention relates to a piezoelectric composition containing a compound expressed by the general formula {Lix(K1-yNay)1-x}(Nb1-zTaz)O3, each of x, y and z respectively falling within composition range of 0≦x≦0.2, 0≦y≦1.0 and 0≦z≦0.4, as its main component, and further containing nickel or a nickel-containing compound. To provide a piezoelectric device that does not contain lead, can be sintered at a normal pressure and has a high electro-mechanical coupling coefficient Kp and a small dielectric loss, the piezoelectric ceramic composition of the invention is expressed by the general formula {Lix(K1-yNay)1-x}(Nb1-z-nTaz(Mn0.5W0.5)nO3, each of x, y, z and n respectively falling within a composition range of 0≦x≦0.2, 0≦y≦1.0, 0≦z≦0.4 and 0<n≦0.1.
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Translation of JP 07-82024.
Derwent abstract for SU 591435, Jan. 16, 1978.
Homma Takahiko
Nagaya Toshiatsu
Nonoyama Tatsuhiko
Saito Yasuyoshi
Takao Hisaaki
Denso Corporation
Koslow C. Melissa
Nixon & Vanderhye P.C.
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