Piezoelectric ceramic and piezoelectric device
US7264744B2 · kind B2 · utility
2Cited by
2References
8Claims
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Key dates
| Filing date | Mar 17, 2005 |
| Grant date | Sep 4, 2007 |
| Priority date | — |
| Expiry date | Mar 14, 2026 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2235/3294
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A piezoelectric ceramic and a piezoelectric device capable of being fired at a low temperature and improving piezoelectric properties are provided. The piezoelectric ceramic and the piezoelectric device includes Pba[(Znb/3Nb2/3)xTiyZrz]O3 (where 0.94≦a≦1.02, 1<b≦3, x+y+z=1, 0.05≦x<0.125, 0.275<y≦0.5, 0.375<z≦0.6) or (Pbe·fMef)[(Zng/3Nb2/3)uTivZrw]O3 (where 0.96≦e≦1.03, 0.01≦f≦0.1, 1<g≦3, u+v+w=1, 0.05≦u<0.125, 0.275<v≦0.5, 0.375<w≦0.6, and Me indicates Sr, Ba or Ca). When an excessive amount of Zn is included, the firing temperature can be lower, and the piezoelectric properties can be improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.