Synthesis and magnetic characterization of Spinel ferrites MFe_2O_4 (M = Ni, Co, Zn and Cu) via chemical co-precipitation method

摘要

Nanostructured ferrite spinels MFe_2O_4 (M = Ni, Co, Zn and Cu) were successfully synthesized via a chemical co-precipitation method. The structure, composition, optical, morphology and magnetic properties of the samples were characterised. The thermal decomposition of the MFe_2O_4 was investigated by TGADTA. X-ray diffraction (XRD) confirmed the formation of single phase MFe_2O_4 (M = Ni, Co, Zn and Cu) with space group Fd-3m and spinel structure and the crystallite size were found to be between 25 and 41 nm. SEM and TEM images showed cubic-like nano-structure. The Fourier transform infra-red (FT-IR) spectros-copy showed absorption bonds, which were assigned to the vibration of tetrahedral and octahedral complexes. Raman spectroscopy is used to verify that we have synthesized ferrite spinels and determines their phonon modes. The optical study UV-visible is used to calculate the band gap energies. The vibrating sample magnetometer (VSM) was used to obtain the hysteresis parameters.