| abstract |
Fe, Mn and Zn as the main components, Co, Ca and Si as the first subcomponent, and at least one group Va metal as the second subcomponent, the total amount of the main components as 100 mol%, Fe There 53-56 mol% calculated as Fe 2 O 3, Zn is 1-9 mol% calculated as ZnO, and the balance is Mn, based on the weight of the total amount of the main component, Co is Co 3 O 4 conversion 500 to 5000 ppm, Ca is 3000 ppm or less in terms of CaCO 3 , the mass ratio of Ca and Si is 2 or more in terms of CaCO 3 and SiO 2, respectively, and Ta in the Va group metal in terms of Ta 2 O 5 Power loss Pcv from 0 ° C to 120 ° C is 350 kW / at 250 MHz or more, with an average crystal grain size of less than 3.2 μm, volume resistivity ρ of 1 Ω · m or more, frequency of 2 MHz and magnetic flux density of 25 mT A low-loss Mn-Zn ferrite characterized by being m 3 or less. |