Dielectric ceramic and laminated ceramic capacitor using the same
US8841225B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 2, 2012 |
| Grant date | Sep 23, 2014 |
| Priority date | — |
| Expiry date | Oct 2, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2993
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A dielectric ceramic that includes a sintered body of BaTiO3 based ceramic grains, in which the ceramic grains each include a shell part as a surface layer part and a core part inside the shell part. The ceramic grains contain, as accessory constituents, R (R, which is a rare-earth element, is at least one selected from the group consisting of Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, and Y) and M (M is at least one selected from the group consisting of Mg, Mn, Ni, Co, Fe, Cr, Cu, Al, Mo, W, and V). R and M are present in the shell part of the ceramic grain, and concentrations of R and M contained in the shell part are increased from a grain boundary toward the core part.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.