Piezoelectric ceramic composition and piezoelectric ceramic device using the same
US6248254A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 8, 2000 |
| Grant date | Jun 19, 2001 |
| Priority date | — |
| Expiry date | Feb 8, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10N30/853
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A piezoelectric ceramic composition is composed of a main component represented by the general formula (Ca.sub.1-x M1.sub.x)Bi.sub.4 Ti.sub.4 O.sub.15 wherein M1 is one of divalent metals other than Ca and trivalent metals other than Bi, and 0<x.ltoreq.0.45, and manganese as an auxiliary component in an amount of more than 0 to not more than about 1.5 percent by weight as MnCO.sub.3. Examples of the divalent metals and trivalent metals include Sr, Ba, Mg, La, Ce, Pr, Nd, Sm, Gd, Dy, Er, Yb, Sc and Y. The piezoelectric ceramic composition has an electromechanical coupling coefficient kt of at least 10%, which 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.