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US 7,108,799 B2Granted
Electromagnetic wave absorber formed of Mn-Zn ferrite
AssigneeMinebea Co., Ltd.
InventorsOsamu Kobayashi, Kiyoshi Ito, Masashi Norizuki
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Abstract
An electromagnetic wave absorber is formed of an Mn—Zn ferrite including: a spinel primary phase which contains 40.0 to 49.9 mol % Fe2O3, 4.0 to 26.5 mol % ZnO, and the remainder consisting of MnO; and a secondary phase which contains CaO as a base component. In the ferrite, the spinel primary phase accounts for 50.0 to 99.0% of the aggregate mass of the spinel primary phase and the secondary phase.
Claims1
An electromagnetic wave absorber formed of an Mn—Zn ferrite comprising:
- a spinel primary phase which contains 40.0 to 49.9 mol % FeO and Fe2O3, 4.0 to 26.5 mol % ZnO, and a remainder of MnO and Mn2O3, wherein Mn2O3 is present in an amount of 0.8 mol % or less and FeO is present in an amount of 0.2 mol % or less;
- and
- a secondary phase which contains CaO as a base component,
- wherein a mass of the spinel primary phase accounts for 50.0 to 99.0% of an aggregate mass of the spinel primary phase and the secondary phase.
1 more element
Dependencies are inferred from the claim text.