MAGNET CORE OF LITHIUM-ZINC-MANGANESE FERRITE

摘要

1. A magnet core of oxidic, ferromagnetic material, consisting of a spinel ferrite having a cubic crystal structure and an electrical resistivity rho exceeding 10**5 Ohm.m for use in the MHz frequency range, characterized in that the composition of the ferrite corresponds to the following formula : (Li0.5 Fe0.5 )1-z-a-y Znz Coa Mny **IIMnx **IIIFe2-x+ delta O4 + 3/2 delta + epsilon with 0.05 =< z < 0.45 0 =< a =< 0.05 0.01 =< x+y =< 0.25 -0.35 =< delta =< -0.05 -0.5x =< epsilon =< +0.25_a to which has been added _p % by weight of Bi2 O3 + _q % by weight of V2 O5 wherein 0 =< p =< 1.2 0 =< q =< 1.2 0.2 =< p+q =< 1.2