| 摘要 |
PURPOSE: A ferrite core and its production method are provided to achieve a ferrite core having high saturation flux density Bs at a high temperature of 100 DEG C or higher, and in particular, at around 150 DEG C, and which has excellent magnetic stability at a high temperature, experiencing reduced deterioration of magnetic properties, and in particular, reduced core loss at such high temperature. CONSTITUTION: A ferrite core contains 56 to 57 mol% of iron oxide calculated in terms of Fe2O3, 5 to 10 mol% of zinc oxide calculated in terms of ZnO, 3 to 6 mol% of nickel oxide calculated in terms of NiO, and the balance of manganese oxide(MnO) as its main components. When the main components has a composition represented by the formula: "(1)" (Zn¬2+a, Ni¬2+b, Mn¬2+c, Mn¬3+d, Fe¬2+e, Fe¬3+f)O4+δ wherein a, b, c, d, e and f meet the relations: a + b + c + d + e + f = 3, and δ= a + b + c + (3/2)d + e +(3/2)f - 4 the value of δ in formula (1) is such that: 0 ≤ δ ≤ 0.001.
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