抄録
We studied the grain boundary chemistry in low loss MnZn ferrites. Some impurities and the sintering conditions, namely temperature and atmosphere, are effective to change the structures of grain boundaries. Especially, the distribution of Ca ions around grain boundaries is very important to attain low core loss. It was found that SO42- ions prevents the uniform distributions of Ca ions on grain boundaries, and oxygen partial pressure of sintering atmosphere can influence the amount of Ca ions that are on grain boundaries effectively.
