Piezoelectric ceramic composition and piezoelectric ceramic device using the same
US6258291A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 7, 2000 |
| Grant date | Jul 10, 2001 |
| Priority date | — |
| Expiry date | Feb 7, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/495
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A lead-free piezoelectric ceramic composition is composed of a main component represented by the general formula (Sr.sub.1-x M1.sub.x)Bi.sub.2 (Nb.sub.1-y W.sub.y).sub.2 O.sub.9, wherein M1 is one of divalent metals other than Sr and trivalent metals other than Bi, 0<x.ltoreq.0.3, and 0<y.ltoreq.0.3. Examples of the divalent metals and trivalent metals include Ca, Ba, Mg, La, Ce, Pr, Nd, Sm, Gd, Dy, Er, Yb, Sc and Y. The piezoelectric ceramic composition can be sintered at a relatively low temperature of 1,100.degree. C. or less, and has an electromechanical coupling coefficient kt which is at a practical level. The piezoelectric ceramic composition may be used in piezoelectric ceramic filters, piezoelectric ceramic oscillators and piezoelectric ceramic vibrators.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.