Piezoelectric material, method of manufacturing the same, piezoelectric element, and piezoelectric element application device
US10427981B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 26, 2014 |
| Grant date | Oct 1, 2019 |
| Priority date | — |
| Expiry date | Jul 13, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2235/3236
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A piezoelectric material contains: a first component which is a rhombohedral crystal in a single composition, has a Curie temperature Tc1, and is a lead-free-system composite oxide having a perovskite-type structure; a second component which is a crystal other than the rhombohedral crystal in a single composition, has a Curie temperature Tc2<Tc1, and is a lead-free-system composite oxide having a perovskite-type structure; and a third component which is a crystal other than the rhombohedral crystal in a single composition similar to the second component, has a Curie temperature Tc3≥Tc1, and is a lead-free-system composite oxide that has a perovskite-type structure and is different from the second component. When a molar ratio of the third component to the sum of the second component and the third component is α and α×Tc3+(1−α)×Tc2 is Tc4, |Tc4−Tc2|≤50° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.