Effect of Ball Milling on the Absorption Properties of Fe₃O₄

FeCl₃∙6H₂O was used as raw material to produce Fe₃O₄, using the solvothermal method with ethylene glycol as the solvent. Fe₃O₄, with different particle sizes, was obtained via mechanical ball-milling by controlling the milling time. Effect of the milling time on the structure, morphology, and electromagnetic parameters of Fe₃O₄ were studied, and the absorption properties and mechanism of Fe₃O₄, for different milling times were analyzed. The results showed that the integrity of the original small spherical structure decreased as the ball milling time increased. Fe₃O₄ showed excellent microwave absorptions as the milling time reached 2 h, the reflection loss reached the maximum of -21.19 dB at 4.64 GHz as the thickness was 6.55 mm.