Preparation and Microwave Absorbing Properties of Hollow Sphere Fe 3 O 4 /Co Composite

In this paper, the hollow sphere Fe 3 O 4 powders pepared by the solvothermal method were mixed with Co nanoparticles (prepared by arc-discharge, the size about 100nm), the quality ratio of Fe 3 O 4 and Co is 4:1. The SEM study shows that the Fe 3 O 4 powders have Hollow sphere structural with the size of about 200nm. As a result, when Co nanoparticles are introduced, Fe 3 O 4 /Co composite absorbent is obtained enhanced microwave absorption properties, which is attributed to the improved synergistic effect of dielectric and magnetic components between e r and μ r . The results show that Fe 3 O 4 /Co composite absorbent is great potential microwave absorbents for practical applications.