Electrical and magnetic properties of Ni 0.75 Zn 0.25 Fe 2 O 4 /Mn 0.8 Zn 0.2 Fe 2 O 4 laminated co-fired ceramic composites prepared by spark plasma sintering

The MnZn/NiZn ferrite laminated co-fired ceramics were successfully prepared via spark plasma sintering (SPS) method. The interface between MnZn and NiZn ferrite layers in the co-fired ceramics has no obvious diffusion due to the short sintering time (less than 3 min) and low temperature (~ 1000 °C). The density and hardness of the co-fired samples increased with the increase of the sintering temperature. Due to the unique sintering process of SPS technique and the difference in electrical conductivity of the two ferrites, the MnZn ferrite layer is dense while the NiZn ferrite layer is loose in the co-fired ceramics. To adjust the sintering compatibility of NiZn ferrite and MnZn ferrite, the sintering additive Bi 2 O 3 was used. Finally, the MnZn/Bi 2 O 3 -modified NiZn ferrite laminated co-fired ceramic composites with high density, hardness and good magnetic properties ( M S-NiZn =68.71 emu/g, H C-NiZn =27.04 Oe, M S-MnZn =33.05 emu/g, H C-MnZn =11.05 Oe) were prepared by spark plasma sintering method. This work provides a simple and feasible method for preparing laminated co-fired ceramics.