Laminated piezoelectric element and process for producing the same
US7667377B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 2, 2008 |
| Grant date | Feb 23, 2010 |
| Priority date | — |
| Expiry date | Jun 2, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/42
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A multilayer piezoelectric device including a body having internal electrode layers and piezoelectric ceramic layers alternately stacked. The internal electrode layers contain Cu as a major component, the piezoelectric ceramic layers contain a compound oxide represented by Pb(Ti, Zr)O3 as a major component, and a metal oxide (Nb2O5, Sb2O5, Ta2O5, or WO3) containing Nb, Sb, Ta, or W, which is at least one of a pentavalent metal element and a hexavalent metal element, is incorporated in the piezoelectric ceramic layers such that the concentration of the metal oxide decreases with distance from the internal electrode layers. Thereby, even in a case where internal electrodes contain Cu as a major component, it is possible to provide a multilayer piezoelectric device which can be obtained by low-temperature firing while ensuring a sufficient piezoelectric constant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.