Piezoelectric ceramics, manufacturing method for piezoelectric ceramics, piezoelectric element, vibration device, and electronic device
US11515468B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 2019 |
| Grant date | Nov 29, 2022 |
| Priority date | — |
| Expiry date | Oct 1, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02N2/163
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Provided is a piezoelectric ceramics having a gradual change in piezoelectric constant depending on an ambient temperature. Specifically, provided is a single-piece piezoelectric ceramics including as a main component a perovskite-type metal oxide represented by a compositional formula of ABO3, wherein an A site element in the compositional formula contains Ba and M1, the M1 being formed of at least one kind selected from the group consisting of Ca and Bi, wherein a B site element in the compositional formula contains T1 and M2, the M2 being formed of at least one kind selected from the group consisting of Zr, Sn, and Hf, wherein concentrations of the M1 and the M2 change in at least one direction of the piezoelectric ceramics, and wherein increase and decrease directions of concentration changes of the M1 and the M2 are directions opposite to each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.