关键词: 片状组装, 钴铁氧体, 超声溶剂热法, 磁性, 吸波性

Abstract: Assembled nano-flake CoFe₂O₄ microspheres were synthesized by using the ultrasonic solvothermal method. The microstructure and morphology of the samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The prepared CoFe₂O₄ microspheres assembled by two-dimensional sheet were cubic structure with particle size about 20—30μm. The magnetic properties and microwave absorbing properties of the flake self-assembled CoFe₂O₄ microspheres and self-made CoFe₂O₄ powder were characterized by using vibrating sample magnetometer (VSM) and network vector analyzer. The saturation magnetization and coercive force of the flake self-assembled CoFe₂O₄ microspheres reached 76.15emu/g and 227.89Oe, respectively. In addition, the flake self-assembled CoFe₂O₄ microspheres had an obvious absorption peak at 6000MHz frequency band, where return loss value was greater than -18 dB and tended to increase. Structure and morphology of the samples had significant impact on their magnetic properties and microwave absorbing properties.

Key words: flake self-assembled, cobalt ferrite, ultrasonic solvothermal method, magnetic properties, microwave absorbing properties