Mn-Zn ferrite and production process thereof
US6547984B2 · kind B2 · utility
4Cited by
1References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 18, 2001 |
| Grant date | Apr 15, 2003 |
| Priority date | — |
| Expiry date | Feb 3, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/344
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention provides a Mn—Zn ferrite having an electrical resistivity exceeding 1 &OHgr;m order and having a high initial permeability of 3000 or more at 100 kHz and 100 or more at 10 MHz. The main components of the Mn—Zn ferrite are 44.0 to 49.8 mol % Fe2O3, 15.0 to 26.5 mol % ZnO, 0.02 to 1.00 mol % Mn2O3 and the remainder MnO. The Mn—Zn ferrite is enabled to be used in a wide frequency region from 100 kHz to 10 MHz by limiting Fe2O3 content to less than 50 mol % that is the stoichiometric composition and inhibiting formation of Mn2O3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.