Preparation and magnetic property analysis of monodisperse Co-Zn ferrite nanospheres

Monodisperse Co-Zn ferrite (Co1-xZnxFe2O4) nanospheres have been synthesized by the solvothermal method. In this process, glycol was used as a solvent, anhydrous sodium acetate was used as an alkalinity additive and polyethylene glycol 200 was used as a surfactant. The as-prepared samples were characterized in detail by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), energy-dispersive X-ray spectroscopy (EDX) and vibrating sample magnetometer (VSM). Results showed that a large number of high purity Co1-xZnxFe2O4 nanocrystallites were synthesized and these nanocrystallites underwent oriented aggregation to form nanospheres. The variation of saturation magnetization (M-s) value of the samples was studied. The maximum saturation magnetization value of the as-prepared sample (Co0.5Zn0.5Fe2O4) reached 64.6 emu g(-1). (C) 2009 Elsevier B.V. All rights reserved.