Preparation and Magnetic Property of Carbon Nanotube/NiZnCo Ferrite Composite

Precipitation hydrothermal method was used to synthesis carbon nanotubes (CNTs) /Ni0.5Zn0.45Co0.05Fe2O4 composites, and then 1wt%CNTs/Ni0.5Zn0.45Co0.05Fe2O4 ceramics were fabricated by spark plasma sintering (SPS) technique. The phase, microstructure and magnetic properties of 1wt%CNTs/Ni0.5Zn0.45Co0.05Fe2O4 were investigated. The results show that, the substitution of zinc ions by cobalt didn’t change the spinel phase of Ni-Zn ferrite. In the SPS process, CNTs promoted the sintering kinetics, and the liquid state of Ni can act as sintering aid to accelerate the grain boundary extension. After sintered by SPS at 750 0C for 5min, the density of the bulk is about 5.2g/cm3, the grain size increased to 91nm, and the saturation magnetization of the 1wt%CNTs/Ni0.5Zn0.45Co0.05Fe2O4 composite ceramics reached at 79.7emu/g