Oxide powder for dielectrics, method of manufacturing oxide powder for dielectrics, and multi-layer ceramic capacitor using the same
US7147835B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 12, 2004 |
| Grant date | Dec 12, 2006 |
| Priority date | — |
| Expiry date | Mar 31, 2025 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2235/79
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Disclosed herein is a small particle oxide powder for dielectrics. The oxide powder has a perovskite structure, an average particle diameter [D50(μm)] of 0.3 μm or less, a particle size distribution of the average particle diameter within 3%, a particle size distribution satisfying a condition D99/D50<2.5, a content of OH− groups of 0.2 wt % and a C/A axial ratio of 1.006 or more. A method of manufacturing the oxide powder comprises the steps of mixing TiO2 particles and a compound solved with at least one element represented by A of the perovskite structure of ABO3; drying and pulverizing the mixture of TiO2 and the compound; calcining the pulverized mixture; adding the oxide containing the elements of the site A to the coated TiO2 particles and wet-mixing, drying and pulverizing; primarily calcining and pulverizing the pulverized powder under vacuum; and secondarily calcining and pulverizing the powder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.