Soft piezoelectric ceramic composition and piezoelectric device using the same
US6808649B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 13, 2002 |
| Grant date | Oct 26, 2004 |
| Priority date | — |
| Expiry date | Nov 13, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2237/408
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The soft piezoelectric ceramic composition is a soft piezoelectric ceramic composition sinterable at a reduced temperature with high piezoelectric parameters and is used in a piezoelectric device. Preferably the soft piezoelectric ceramic composition comprises:[(Pb1-m-nSrmBan)(1-y)Biy[](ZrxTi1-x)1-a-bNiaWb]O3+pCdO wherein m,n,x,y,a and b are molar ratio, p is wt % and are in ranges, repectively,0.00≦m<0.18, 0.00≦n≦0.18,0.00≦(m+n)≦0.21,0.40≦x≦0.60 0.00<y<0.04, 0.00≦a≦0.02, 0.00<b≦0.02, 0.00<p≦2.00. The soft piezoelectric ceramic composition has high piezoelectric constants and electromechanical coupling coefficients and can be sintered at a reduced temperature below 1000° C. Further, the soft piezoelectric ceramic materials can be co-fired with pure Ag electrode below 960° C. Based on the piezoelectric ceramic compositions provided, multi-layer piezoelectric actuators are built with pure Ag internal electrode, saving a cost of electrode as much as 90% compared to Ag—Pd (30%) internal electrode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.