Dielectric ceramics and multilayer ceramic capacitor
US8203825B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 21, 2008 |
| Grant date | Jun 19, 2012 |
| Priority date | — |
| Expiry date | Jan 8, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2235/85
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
To provide a dielectric ceramics achieving a high insulation resistance even at a low applied voltage, and minimizing insulation resistance drop when the voltage is increased, and also provide a multilayer ceramic capacitor including the dielectric ceramics as a dielectric layer, and having excellent life characteristics in a high temperature load test. The dielectric ceramics has crystal grains composed mainly of barium titanate and containing vanadium, and a grain boundary phase existing between the crystal grains. The dielectric ceramics contains 0.0005 to 0.03 moles of vanadium in terms of V2O5, with respect to 1 mole of barium constituting the barium titanate. In the X-ray diffraction chart of the dielectric ceramics, the diffraction intensity of (004) plane indicating the tetragonal system of barium titanate is larger than the diffraction intensity of (400) plane indicating the cubic system of barium titanate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.