Preparation of Cu-Ni Ferrite Nanopowders by Coprecipitation Method with Ultrasound Irradiation and Its Properties

초록

The Cu-Ni ferrite (Cu1-xNixFe2O4) nanopowders were synthesized adopting coprecipitation method with ultrasound irradiation. The Cu1-xNixFe2O4 nanopowders were composed of a pure spinel phase with the grain size of 20~30 nm. The specific surface area of Cu1-xNixFe2O4 nanopowders prepared with ultrasound irradiation show a tendency to decrease with increasing Ni content (x). The maximum value of saturation magnetization was 73.5 emu/g at x=0.5. The nanopowders showed that the reflection loss was more than ?0 dB in the range from 2.5 GHz to 5.5 GHz . The matching frequency and matching thickness of the ferrite powders had varied sensitively on the composition of x (Ni content).