Dielectric ceramic composition and ceramic electronic device
US9666372B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 8, 2016 |
| Grant date | May 30, 2017 |
| Priority date | — |
| Expiry date | Mar 8, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2237/68
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A dielectric ceramic composition including a main component having a perovskite crystal structure expressed by general formula ABO3, a first sub-component of an oxide of a rare earth element, and a second sub-component of an oxide of Si, and at least dielectric particles having a core-shell structure and segregated particles, in which a concentration of the rare earth element in the segregated particles is two or more times an average concentration of the rare earth element in a shell portion of the dielectric particles having the core-shell structure, and an area of the region occupied by the segregated particles is 5.0% or less and an average of cross-sectional areas of the respective segregated particles is 0.075 μm2 or less in a cross-section obtained by cutting the dielectric ceramic composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.