Piezoelectric ceramic compact and piezoelectric ceramic device
US6488864B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 18, 2001 |
| Grant date | Dec 3, 2002 |
| Priority date | — |
| Expiry date | May 18, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H3/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A piezoelectric ceramic compact is provided as an effective material for forming piezoelectric ceramic devices and the like, and is primarily composed SrBi2Nb2O9 containing no lead nor lead compounds or containing a little amount thereof, and has a maximum value Qmax improved to a level suitable for practical use. In the piezoelectric ceramic compact primarily having a bismuth-based layered compound containing Sr, Bi, Nb and oxygen, when the molar ratio of Sr, Bi and Nb contained as primary components in the bismuth-based layered compound is represented by a: b: c, the relationships represented by 0.275≦a/c<0.5 and 4≦(2a +3b)/c≦4.5 are satisfied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.