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US 2008/0258100 A1Published application
Piezoelectric ceramic composition and resonator
AssigneeTDK Corporation
InventorsKeisuke Teranishi, Masakazu Hirose, Tomohisa Azuma
Life of this patent
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Abstract
To obtain a piezoelectric ceramic composition having extremely high heat resisting property. Provided is a piezoelectric ceramic composition comprising a main component represented by Pba[(MnbNbc)dTieZrf]O3 (wherein 0.98≦a≦1.01, 0.340≦b≦0.384, 0.616≦c≦0.660, 0.08≦d≦0.12, 0.500≦e≦0.540, 0.37≦f≦0.41, bd+cd+e+f=1), and 1 to 10% by weight of Al in terms of Al2O3 as an additive. Preferably, b is such that 0.345≦b≦0.375 and c is such that 0.625≦c≦0.655, and the Al as the additive is preferably 2 to 6% by weight in terms of Al2O3.
Claims4
A piezoelectric ceramic composition comprising:
- a main component represented by a composition formula:
- Pba[(MnbNbc)dTieZrf]O3, wherein in the composition formula a to f satisfy:
- 0.98≦a≦1.01,
- 0.340≦b≦0.384,
- 0.616≦c≦0.660,
- 0.08≦d≦0.12,
- 0.500≦e≦0.540,
- 0.37≦f≦0.41, and
- bd+cd+e+f=1, and
- 1 to 10% by weight of Al in terms of Al2O3 as an additive.
7 more elements
A resonator comprising:
- a piezoelectric resonator provided with a vibrating electrode formed thereon;
- and
- a substrate for supporting the piezoelectric resonator, wherein
- the piezoelectric resonator is constituted from a piezoelectric ceramic comprising:
- a main component represented by a composition formula:
- Pba[(MnbNbc)dTieZrf]O3, wherein in the composition formula a to f satisfy:
- 0.98≦a≦1.01,
- 0.340≦b≦0.384,
- 0.616≦c≦0.660,
- 0.08≦d≦0.12,
- 0.500≦e≦0.540,
- 0.37≦f≦0.41, and
- bd+cd+e+f=1, and
- 1 to 10% by weight of Al in terms of Al2O3 as an additive.
11 more elements
Dependencies are inferred from the claim text.