抄録
Mn-Zn ferrite with fine grains of about 2.1μ m in size was synthesized by sintering of hydrothermal-precipitated ferrite powders, and its core losses were evaluated. At room temperature, based on the dependence of frequency, the core losses of the ferrite at 0.2MHz to 2MHz with 50mT and at 0.5MHz to 5MHz with 5mT are smaller than those of the commercial ferrites with grains of 7.7 μ m to 10.9 μm in size. So, the core loss is 70% at 500kHz, 50mT and 50% at 1MHz, 5mT of that of the commercial ferrites, respectively. At 80°C, which is almost actual circumstance, the core loss of the ferrite is also smaller than that of the commercial ferrite at 0.5MHz to 1MHz. Therefore, the fine grain ferrite is expected to be useful as material for high-frequency transformer.
