HIGH-FREQUENCY MN-ZN POWER FERRITES

Relationships between chemical composition, microstructure and core lo sses of Mn-Zn power ferrites are discussed. We report in this paper th e influence on core losses of silica-calcia additions and Ti-substitut ions for optimising a power ferrite from 25 kHz up to 2 MHz. Our resul ts are well explained using core losses description including the doma in walls resonance-relaxation loss contribution depicted in previous p apers and confirm that it is essential to take this contribution into account when optimising low losses ferrites in specific conditions of temperature, frequency and induction, especially in a high frequency r ange.