Ni ferrite and core made of Ni ferrite for power supplies

Details Ni ferrite and core made of Ni ferrite for power supplies Ni ferrite and core made of Ni ferrite for power supplies

1995-03-13

1997-04-08

Bonner, Melissa

Compositions

Magnetic

Iron-oxygen compound containing

252 6262, C04B 3530

Patent

active

056184646

ABSTRACT:
A Ni ferrite sintered body comprising 48.0-50.0 mol % of Fe.sub.2 O.sub.3, 14.0-24.0 mol % of NiO and 28.0-36.0 mol % of ZnO with 50 ppm or less of P as an impurity, the sintered body having a minimum core loss of 30 kW/m.sup.3 or less at 50 kHz and 50 mT, and the segregation percentage of P in the crystal structure being 1% or less by area. The Ni ferrite sintered body preferably has an average crystal grain size of 3-30 .mu.m, the percentage of crystal grain particles larger than two times the average crystal grain size being preferably 10% or less based on the total number of the crystal grain particles in a crystal structure.

REFERENCES:
patent: 2933565 (1960-04-01), Neumann
patent: 3573208 (1971-03-01), Brockman et al.
patent: 4059664 (1977-11-01), Nicolas et al.
patent: 5198138 (1993-03-01), Yamamoto et al.

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