抄録
Effects of impurities and firing atmosphere on the electromagnetic properties of low temperature sintered NiCuZn ferrites have been studied with reference to their microstructures. It is shown that a low oxygen partial pressure during firing is effective to achieve a high quality factor of a NiO-rich NiCuZn ferrite for high frequency use. This can be responsible for the less interference fringes at the grain boundaries. TEM observation indicates that CuO and CoO are enriched at the central part of interference fringes. Moreover, the quality factor is strongly affected by impurities or a small amount of ingredients such as CoO, MnO, and P.
