Piezoelectric ceramic and piezoelectric element
US7965020B2 · kind B2 · utility
1Cited by
6References
20Claims
0Family size
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Key dates
| Filing date | Apr 20, 2009 |
| Grant date | Jun 21, 2011 |
| Priority date | — |
| Expiry date | Jul 12, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2235/85
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A piezoelectric ceramic which has a large value of coercive electric field and, in addition, which can be fired at low temperatures of 950° C. or lower, is provided. It has a composition represented by Pbx-a-dBiaM3d{M1b(M21/3Nb2/3)yZr1-b-y-zTiz}O3 where M1 and M2 represent, independently, at least one of Ni and Zn, and M3 represents at least one of Ba and Sr, 0.05≦a≦0.15, 0<b≦0.075, 0≦(a−2b), 0≦d≦0.1, 0.97≦x≦1.00, 0.020≦y≦0.250, and 0.398≦z≦0.512. It is preferable that M1 represents Ni, and M2 represents at least one of Ni and Zn. Moreover, it is preferable that Ni is in the state of being segregated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.