Compositions – Piezoelectric – Lead – zirconium – titanium or compound thereof containing
Reexamination Certificate
2005-12-27
2005-12-27
Koslow, C. Melissa (Department: 1755)
Compositions
Piezoelectric
Lead, zirconium, titanium or compound thereof containing
C501S134000, C501S145000
Reexamination Certificate
active
06979410
ABSTRACT:
Provided are a piezoelectric ceramic and a piezoelectric device having a larger piezoelectric strain constant and capable of being fired at a lower temperature. A main component of PbA[(Mg1/3Nb2/3)a(Zn1/3Nb2/3)bTicZrd]O3(a+b+c+d=1, 0.99≦A≦1.01, 0.15≦a+b≦0.5, 0.05≦b≦0.25, 0.2≦c≦0.5, 0.15≦d≦0.6) and 0.01 mass % to 0.8 mass % inclusive of at least one kind selected from the group consisting of Fe, Co, Ni and Cu in the form of oxide per 1 mol of the main component as a first sub-component are comprised. Thereby, a larger piezoelectric strain constant can be obtained, and a firing temperature can be reduced. In the main component, a part of Pb may be replaced with at least one kind selected from the group consisting of Ca, Sr and Ba. Further, as a second sub-component, 0.05 mass % to 1.0 mass % inclusive of at least one kind selected from the group consisting of Sb, Nb and Ta in the form of oxide per 1 mol of the main component may be comprised.
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Derwent abstract for SU 13126, May 30, 1974.
Koslow C. Melissa
Oliff & Berridg,e PLC
TDK Corporation
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