Effect of heat treatment on structural and magnetic properties of Li–Ni ferrite prepared via sol–gel auto-combustion method

Abstract

Nanocrystalline Li0.35Ni0.3Fe2.35O4 ferrites were prepared at different annealing temperature by sol-gel auto-combustion method. The effects of the annealing temperature on the structure and magnetic properties of the synthesized Li-Ni ferrites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectra (FT-IR) and Squid-VSM. Rietveld refinement of the X-ray diffraction data confirmed the occurrence of phase transition from α-spinel to β-spinel, from which the ideal cation occupation and lattice parameter can be obtained. The grain size increased significantly with annealing temperature. The variation of saturation magnetization can be well explained in terms of the occupation of ions in tetrahedron and octahedron. The coercivity initially increased and later decreased significantly from 115 to 37 Oe with the increase of annealed temperature which could be attributed the fact that the 600℃-annealed grain size is close to transition size from single to multidomain region.

Structural, Morphological and Electrical Studies of Co1-x Zn x Fe2O4 Ceramics

“…But despite that, an elaborate study of the structural, morphological, electrical, magnetic as well as optical properties of Zn-substituted CFO NPs synthesised employing the sol-gel method in the broad region has not been disclosed yet. [24][25][26][27][28] The sol-gel approach has recently gained increased attention due to its benefits of inexpensive precursors, easeful synthesis and potential ultrafine particles. Recent advancements in sol-gel technology have facilitated the creation of a technique for colloidal crystallisation at temperatures as low as 100 °C which fostered the synthesis of nanocrystalline oxides, mixed oxides, and composites.…”