Magnetic core for transformer, Mn-Zn based ferrite composition and methods of producing the same

摘要

An Mn-Zn based ferrite composition having a main component comprised of Fe2O3: 51.5 to 54.5 mol%, ZnO: 19.0 to 27.0 mol% and the rest of substantially MnO and a first sub component comprised of 0.002 to 0.040 wt% of SiO2, 0.003 to 0.045 wt% of CaO and 0.010 wt% or less of P with respect to 100 wt% of the main component. In a magnetic core for a transformer comprised of this composition, the THD of the transformer becomes -84dB or less in a broad frequency band, so it can be preferably used as a magnetic core, for example, for an xDSL modem transformer.