Preparation Of Ferrite And Study On Properties Of Magnetic Intercalation Composites

With the development of science and technology, people have put forward more and more requirements for the electronic devices, which needs miniaturized and integrated for the devices. Nano materials promotes the miniaturization of the devices. We prepared CoFe2O4 and Nio.4Zno.6Fe204 nanopowders with a hydrothermal method under different magnetic fields and researched their magnetic properties. xNio.4Zno.6Fe2O4-(1-x)(Mgo.95Zno.o5)(Ti0.8Sn0.2)04 composite powders were synthesized with a solid state method and then a hydrothermal method. And then, we researched the electric and magnetic properties of the ceramics sintered with the composite powders.CoFe2O4 particles from several nanometers to twenty nanometers were prepared by hydrothermal method under different magnetic fields with Co(NO3)2·6H2O, Fe(NO3)3·9H2O, NaOH as raw materials. The crystal phase, morphology and magnetic properties were characterized by XRD, TEM and vibrating sample magnetometer. The results show that CoFe2O4 powders with high purity are obtained after the hydrothermal reaction. Magnetic field has a great impact on the lattice parameter and the magnetic properties. The particle size and the saturation of samples decrease with the increase in magnetic field in a certain magnetic range. But beyond the certain range, the particle size and saturation increase with the magnetic field.Nio.4Zno.6Fe2O4 particles were prepared by hydrothermal method under different magnetic fields. The effect of magnetic field on grain size, lattice parameters and saturation was researched. The crystal phase, morphology and magnetic properties were characterized by XRD, TEM and vibrating sample magnetometer. The results show that Nio.4Zno.6Fe204 powders with high purity are obtained after the hydrothermal reaction. The particle size and the saturation of samples decrease with the increase in magnetic field in a certain magnetic range. But beyond the certain range, the particle size and the saturation increase with the magnetic field.xNio.4Zno.6Fe204-(1-x)(Mg0.95Zn0.05)(Ti0.8Sn0.2)O4 microwave composite particles were synthesized by a common solid state reaction method and then a simple hydrothermal method in two steps:preparing (Mg0.95Zn0.05)(Ti0.8Sn0.2)O4 particles by solid state reaction and then synthesizing core-shell nanocomposites by hydrothermal. Composite ceramics were sintered at 1200 ℃ from these powders. XRD, SEM, TEM analyses indicated that high dense core-shell composites with (Mg0.95Zn0.05)(Ti0.8Sn0.2)04 core and Nio.4Zno.6Fe2O4 shell without any foreign phase were formed after sintered at high temperature. Different types of sharp interfaces were self-assembled owing to the minimization of direct elastic energy. The saturation magnetization of the composites linearly increased with the Nio.4Zno.6Fe204 content, the dielectric constant and dielectric loss are better when the ferrite is 80%.