Study on the magnetic properties of low-fired NiCuZn ferrite prepared by a combined method

摘要

The NiCuZn ferrites were first prepared by the conventional mixed-oxide method with Fe2O3, NiO, ZnO and CuO analytical grade powders as starting materials. These materials were wet-mixed in a ball mill for relatively longer time to decrease the size of particles. After the mixed powders calcined, the sintering aids Bi2O3 were added (0.5, 1.0, 1.5, 2.0, 2.5 and 3.0 wt%) in the ferrite powders obtained. After the powders mixed by wet-milling and pressed into toroidal bodies, the green bodies were sintered at 900 °C and held for 3h in air then the sintered samples were tested and analyzed. The phase formation was evaluated with X-ray diffraction(XRD). The microstructures on the cross section of the samples were investigated using scanning electron microscopy(SEM). The initial permeability and Q-factor measurements were carried out on precision LCR meter(Agilent 4285) in the range of 0.1MHz-30MHz.