Piezoelectric ceramic composition
US5945030A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 7, 1998 |
| Grant date | Aug 31, 1999 |
| Priority date | — |
| Expiry date | Jul 7, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/475
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Disclosed are piezoelectric ceramic compositions comprising, as the essential component, (Na.sub.0.5 Bi.sub.0.5)Bi.sub.4 Ti.sub.4 O.sub.15, or (Na.sub.0.5 Bi.sub.0.5).sub.1-x M.sub.x Bi.sub.4 Ti.sub.4 O.sub.15 where M is at least one divalent metal element or (A1.sub.0.5 A2.sub.0.5) and A1 is at least one monovalent metal element, A2 is at least one trivalent metal element, and 0<x.ltoreq.0.5, and, as the side component, manganese in an amount of from about 0.7 to 3.0% by weight, relative to the essential component and in terms of MnCO.sub.3. The compositions have a piezoelectric constant, d.sub.33, of not smaller than 25 pC/N at temperatures above 500.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.