Synthesis and characterization of Co/cenosphere core–shell structure composites

The cobalt film was successfully coated on the cenosphere particles using heterogeneous precipitation thermal reduction method. The morphology and microstructure of the products were analyzed by field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD). FE-SEM results implied that the Co film was relatively uniform and compact. XRD results indicated that the Co film coated on cenospheres was a face-centered cubic structure (fcc) and the crystallite size of Co particles was about 24.5 nm. The magnetic property of Co/cenosphere composites was measured by vibrating sample magnetometer (VSM), and the results showed that the Co/cenosphere composites were of the weak soft magnetic property at room temperature, the Ms and Hc value was 18.2 Am2 kg−1 and 28.4 kA m−1, respectively.