Abstract
Porous Co–Ni ferrite nanorods with a diameter of around 30–200nm and a length of several micrometers were synthesized by a microemulsion-based method in combination with calcination at different temperatures. The morphologies and structures of the Co–Ni ferrite nanorods and their precursors of Co/Ni/Fe composite oxalate nanorods were characterized using a transmission electron microscopy, field emission scanning electron microscopy and X-ray diffractometer. Magnetization measurement was carried out using a vibrating sample magnetometer at room temperature. It showed that the saturation magnetization of Co0.5Ni0.5Fe2O4 nanorods obtained at 1000°C could reach to 51.114emu/g. The influence of calcination temperatures and compositions of the ferrites on their magnetic properties were also discussed. Therefore, Co–Ni ferrite nanorods could be easily prepared using this method and might be applied as catalysts, magnetic materials and microwave absorbers.
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