| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a ferrite small in magnetic loss and power loss, the ferrite obtained by the method, and a core for power source using the ferrite. SOLUTION: In this method for producing a MnZn-based ferrite comprising a process for keeping a maximum temperature during firing and a temperature- reducing process in a nitrogen atmosphere, a nitrogen atmosphere switching temperature T in the temperature-reducing process is more than 1,000 deg.C but less than 1,150 deg.C, and a temperature-reducing rate V1 satisfies the formula (1), T<=(V1+1,450)/1.5 (wherein, T is a nitrogen atmosphere switching temperature ( deg.C), and V1 is a temperature-reducing rate in the range of from the temperature T to 900 deg.C ( deg.C/time). The core for power source is prepared by using the ferrite obtained by the above method. |
