Mn—Zn ferrite containing less than 50 mol% Fe2O3

Details Mn—Zn ferrite containing less than 50 mol% Fe2O3 Mn—Zn ferrite containing less than 50 mol% Fe2O3

2006-01-10

2006-01-10

Koslow, C. Melissa (Department: 1755)

Compositions

Magnetic

Iron-oxygen compound containing

C252S062590, C252S062630

Reexamination Certificate

active

06984337

ABSTRACT:
An Mn—Zn ferrite includes base components of 44.0 to 49.8 mol % Fe2O3, 4.0 to 26.5 mol % ZnO, at least one of 0.1 to 4.0 mol % TiO2and SnO2, 0.5 mol % or less Mn2O3, and the remainder consisting of MnO, and contains 0.20 (0.20 excluded) to 1.00 mass % CaO as additive. Since the Mn—Zn ferrite contains less than 50 mol % Fe2O3and a limited amount (0.5 mol % or less) of Mn2O3, an abnormal grain growth does not occur even if CaO content is more than 0.20 mass %, and a high electrical resistance can be gained. And, since an appropriate amount of TiO2and/or SnO2is contained, an initial permeability is kept adequately high, whereby an excellent soft magnetism can be achieved in a high frequency band such as 1 MHz.

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patent: 3108803 (2000-09-01), None

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