High energy density piezoelectric ceramic materials
US7686974B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 18, 2005 |
| Grant date | Mar 30, 2010 |
| Priority date | — |
| Expiry date | Sep 13, 2026 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2235/81
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention includes methods, devices, and compositions having improved piezoelectric characteristics with high energy density. Compositions of the present invention are ceramic materials of the formula: Pb[(Zr0.52Ti0.48)O3]1−x[(Zn1/3Nb2/3)O3]x+Mn, where x is 0.05 to 0.20 and Mn is manganese in a form that is present from about 0.1 to 1.5 wt %. Suitable manganese forms as the starting material include MnCO3, MnO2, MnO, and Mn3O4. The compositions exhibit a high product of piezoelectric voltage constant and piezoelectric stress constant. The compositions are polycrystalline or textured with a dense microstructure and small grain. The piezoelectric voltage constant and piezoelectric stress constant obtained from such compositions are superior to those of conventional hard or soft ceramics and yield a magnitude product of the piezoelectric voltage constant and piezoelectric stress constant that is significantly higher than those reported in the literature or in available with commercial or conventional ceramic compositions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.