Piezoelectric ceramic comprising an oxide and piezoelectric device
US9105845B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 2012 |
| Grant date | Aug 11, 2015 |
| Priority date | — |
| Expiry date | Nov 19, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2235/3244
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A piezoelectric ceramic with environmental friendliness including a composition as the main component composed of a composite oxide free from lead (Pb) as a constituent element, and with excellent piezoelectric characteristics such as the relative dielectric constant, the electromechanical coupling factor, and the piezoelectric constant, and a piezoelectric device using the piezoelectric ceramic, are provided. A piezoelectric ceramic including a composition represented by the following general formula as the main component: (K1-x-y-w-vNaxLiyBawSrv)m(Nb1-z-uTaz-Zru)O3 (wherein, x, y, z, w, v, u and m in the formula satisfy the following conditions respectively: 0.4<x≦0.7; 0.02≦y≦0.1; 0<z≦0.3; 0<w≦0.01; 0.04≦v≦0.07; 0.04≦u≦0.07; and 0.95≦m<1).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.