Heat resistance High magnetic permeability MnZn ferrite

摘要

PROBLEM TO BE SOLVED: To provide a heat-resistant high magnetic permeability MnZn ferrite having a small decrease in initial high relative initial magnetic permeability even when continuously used for a long period of time in a high temperature environment of 100 ° C. or higher. SOLUTION: MnZn ferrite having Fe ₂ O ₃ as main components, Zn O and Mn O as main components, and Fe ₂ O ₃ is 50.60 to 53.70 mol% and ZnO is 18.0 to 18.0 to 100 mol% of the main components. It is contained in an amount of 20.00 mol%, which is the balance of MnO, and when the total amount of the main component is 100 parts by mass, Co ₂ O ₃ is 0.10 to 0.55 parts by mass and Bi ₂ O as a sub component. ₃ is 0.001 to 0.030 parts by mass, MoO ₃ is 0.001 to 0.020 parts by mass, SiO ₂ is 0.001 to 0.010 parts by mass, and CaO is 0.015 to 0.030 parts by mass. MnZn ferrite is used, which further contains one or both of 0.10 to 2.50 parts by mass of TiO ₂ and 0.50 to 4.00 parts by mass of SnO ₂ . [Selection diagram] None