Piezoelectric ceramic composition and ceramic piezoelectric device employing the composition
US6372152B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 2000 |
| Grant date | Apr 16, 2002 |
| Priority date | — |
| Expiry date | Aug 27, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/475
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
To provide a piezoelectric ceramic composition predominantly comprising CaBi4Ti4O15, which composition can be fired at 1100° C. or lower, which exhibits an electromechanical coupling coefficient (kt) of a sufficient level for practical use, and which serves as a useful material for producing ceramic piezoelectric devices such as piezoelectric filters, piezoelectric oscillators and piezoelectric transducers, and to provide a ceramic piezoelectric device employing the composition, the piezoelectric ceramic composition comprises a component represented by the formula CaBi4Ti4O15, wherein the composition contains W in an amount of about 0.5 mol or less per mol of Bi.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.