LAUSR

Cauliflower-like CeO2 particles composed of numerous nanorods with variable diameters of 100–220 nm have been successfully synthesized via a facile template-free hydrothermal method. The influences of the reaction time on the morphologies, crystal structures, and magnetic properties of the resulting products have been investigated. X-ray photoelectron spectroscopy shows that Ce4+ and Ce3+ ions coexist at the surface of the particles. M–H curve with the saturation magnetization (Ms) of 2.72 × 10− 2 emu/g, residual magnetization (Mr) of 0.58 × 10− 2 emu/g and coercivity (Hc) of 275 Oe, exhibits excellent room-temperature ferromagnetism, which is likely ascribed to their synergistic effect of the Ce3+ ions and oxygen vacancies.