Nanocrystalline Mn-Zn-ferrite by novel oxalato-hydrazinated complex method

摘要

We report here for the first time the synthesis of technologically important ferrite, using a metal oxalato-hydrazinate (MOH) complex method. The MOH complex of iron-manganese-zinc was synthesized at room temperature using the precursors, ferrous ammonium sulphate, manganese acetate and zinc acetate. Thermo-gravimetric studies of MOH intermediate showed complete phase formation of MnZnFe_2O_4 at 280 ℃. XRD data showed the formation of single phase cubic spinel MnZnFe_2O_4. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) demonstrate the spherical shape particle morphology. TEM images indicated the particle size of ferrite powder in the range of 20-36nm. Magnetization of synthesized nano-sized Mno.69Zno.19Fe2.12O4 was observed coercive force (H_c) at 127.82 Oe with a saturation magnetization (M_s), 34.5 emu g~(-1) using vibrating sample magnetometer (VSM) at room temperature. Mossbauer study of nano-sized ferrite powder showed super-paramagnteic behavior.