Piezoelectric ceramic composition
US5753136A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 27, 1997 |
| Grant date | May 19, 1998 |
| Priority date | — |
| Expiry date | May 27, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/493
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
This invention provides a piezoelectric ceramic composition having large field-induced strain under high compressive stress, small temperature dependence of strain, and high energy conversion efficiency even at high temperatures. The composition is represented by; EQU (Pb.sub.1-(3X/2)-(U/2) La.sub.X)((Zr.sub.Y Ti.sub.1-Y).sub.1-Z-U (Mg.sub.1/3 Nb.sub.2/3).sub.Z Nb.sub.U)O.sub.3 where 0<X<2/3; 0<U<1; 0.53-(Z/3).ltoreq.Y.ltoreq.0.56-(Z/3); and 0.02.ltoreq.Z.ltoreq.0.10. In this composition, a part of the crystals of PZT has been substituted by La and Nb and further by a suitable amount of PMN. These substituents play complementary roles to each other to impart aforementioned excellent properties to the ceramic composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.