Abstract
Lithium ferrites are a low-cost material which have been prominent in the high frequency core industry because of their excellent temperature performance and high squareness ratio. In order to develope the lithium ferrites with the high squareness and low coercive force, the ferrites of <TEX>$Li_{0.48}Bi_{0.02}Ni_{0.04}Fe_{2.46-x}O_4$</TEX> were investigated the by varying composition, temperature and frequency. Electric loss of the Li-ferrite was lowered with the substitution of <TEX>$Mn_{2}O_3$</TEX>. The addition of <TEX>$Mn_{2}O_3$</TEX> increased the magnetic induction (Bm&Br) but decreased the coercive force (Hc) and the squareness ratio (R=Br/Bm). Also, the Br value was stable at environmental temperature variation.
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