Synthesis and Magnetic Properties of Co_(0.5)Zn_(0.5)Fe_2O_4 Nanoparticles by Template-Assisted Combustion Method

摘要

In the present article, zinc cobalt ferrite (Co_(0.5)Zn_(0.5)Fe_2O_4) nanopowders were synthesized by a template-assisted citric combustion method. Polyethylene Glycol (PEG-4000) and carboxymethyl cellulose (CMC) were used as the templating agents for controlling the anisotropy and the microstructure of the Co_(0.5)Zn_(0.5)Fe_2O_4 nanopowder. The synthesized nanopowders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and a vibrating sample magnetometer (VSM). The results indicated that pure samples were obtained at calcining temperature of 700°C and the templates remarkably changed microstructure and magnetic behavior of the nanopowders. All of the powders synthesized were ferromagnetic. The powder synthesized with template PEG-4000 had a smallest coercivity (75 Oe) but largest magnetization (80.3 emu g~(-1)) close to that of bulk material. The powders synthesized without template exhibited moderate coercivity (18640e) and smallest magnetization (53.2 emu g~(-1)). A largest coercivity (39860e) and a moderate magnetization (60.9emu- g~(-1)') were observed when the template CMC was used. The variation in the magnetic nature of the powders can be related to their anisotropy growth and average particle size.