科研之友
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摘要
Mn-Zn ferrite nanoparticles about 15 nm with various amounts of Co substituting for Mn were synthesized in microemulsion at 50 degrees C. The samples were characterized by energy-dispersive X-ray spectroscopy, X-ray diffraction, scanning electron microscope, and vibrating sample magnetometer. The experimental results indicate the formula for all samples can be derived as CoxMn1-xZn0.5Fe1.504, and the presence of single-phase spinel ferrite is in all the samples without annealing at high temperature. The saturation magnetization increases with Co content (x = 0 to 0.31) followed by a decrease with further enhancement of Co (x = 0.39 and 0.48). Compared with that of Mn-Zn ferrite annealed at 600 degrees C for 4 h, the saturation magnetization of the synthesis sample without annealing is larger, but the coercivity force is smaller.
