Barium titanate powder and method for producing same
US8084014B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 2004 |
| Grant date | Dec 27, 2011 |
| Priority date | — |
| Expiry date | Oct 30, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2235/761
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A barium titanate powder and a method for producing the same are provided. The barium titanate powder comprises a perovskite structure having a ratio c/a of 1.008 or more and ratio d/D of from 1 to 1.5, wherein “c” is a length of the c axis, “a” is a length of the a axis in the perovskite structure, “d” is an average particle diameter and “D” is a equivalent specific surface area diameter. The method of producing a barium titanate powder, comprises the steps of: (1) heating a mixture containing a titanium compound and a barium compound under a gas atmosphere containing a halogen at a temperature of not less than about 200° C. and less than the temperature for generation of barium titanate, (2) calcining the obtained mixture under an atmosphere containing substantially no halogen at a temperature of not lower than the temperature for generation of barium titanate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.