Magneto-structural properties of Ni�?�Zn nanoferrites synthesized by the low-temperature auto-combustion method

[摘要] Using nickel, zinc and ferric nitrates, and glycine in a fuel-rich composition, Ni_{1â€�?�ð�?��?}Zn_ð‘�?Fe₂O₄ nanoparticles were prepared by a simple low-temperature auto-combustion method without further sintering at high temperatures. The auto-combusted powders obtained were characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy, energy-dispersive X-ray (EDAX) analysis and vibrating scanning magnetometer measurements. XRD confirms the formation of pure nanocrystalline spinel phases with an average diameter of about 55 nm. Raman spectra show tetrahedral and octahedral sites in the structure of Ni_{1â€�?�ð�?��?}Zn_ð‘�?Fe₂O₄ and also imply the doping of Zn²⁺ and displacement of Fe³⁺ ions from the tetrahedral site. EDAX showed that the samples were close to the nominal compositions. The magnetic measurement shows that the saturation magnetization and remanence magnetization decreases with the increase in the zinc content.

[学科分类] 材料工程

[关键词] Niâ€�?�Zn ferrites;fuel-rich composition;combustion synthesis;Raman studies;magnetism.