Al and PEG Effect on Structural and Physicochemical Properties of CoFe2O4

Abstract

In this work, pure and Alumina doped cobalt ferrite nanoparticles CoFe 2−x Al x O 4 (for x = 0.44) have been synthesized by the sol gel method. The influence of alumina doping on the morphological and mechanical properties of CoFe 2 O 4 nano-particles were investigated by means of X-ray powder diffraction (XRD) and rietveld analysis. XRD analysis confirmed that the single phase formation of pure nano particles with the expected cubic inverse spinel structure with Fd3m space group and without any impurity phase. Alumina doping were led to a decrease in the crystallite size, lattice parameter, elastic constants and magnitude of moduli. It is explained on the basis of the replacement of Fe ions with half-filled d-shell (3d 5 ) and larger radius by Al 3+ ions with a completely filled shell (2p 6 ) and smaller radius.

Investigation of Structural Parameters and Magnetic Properties of Mixed Li-Ni Spinel Ferrites

“…This results agreed with the other worker [37]. The observed trend is suggesting that with the increasing substitution of Ni 2+ ions, the anions are moving toward the cations at T d interstices due to the expansion of the T d interstices [15,16]. For spinel compounds, the anion sublattice expands or reduces by varying u, until the T d site and O h site volumes match the radii of the consistent cations [17].…”

“…The cations radii and are the mean ionic radii per molecule for the T d and the O h sites, respectively, can be calculated according to the suggested cations distribution, using equations [29] (1) parameter or anion parameter (u) [31,32]. The detailed positions for the O 2ions can be determined by u, which reflects alteration of the structure to accommodate differences in the [15,16].…”

“…The BLs between the cation-cation (C-C) and cations-anion (C-A) play a crucial role on the overall strength of different magnetic interactions and super exchange interaction. Therefore, in present work we tried to evaluate the same to get information about the effect of Ni 2+ ions on the super-exchange interactions [15,16]. The defined BLs between the C-C are b,c,d,e and f, also between the C-A are p,q,r and s [29] can be calculated using (Eqs.…”

“…The observed changes in these properties are brought about by a redistribution of cations among the T d and O h sites of the ferrites sublattices [2]. Theoretical estimation of magnetic interactions based on cation distribution clearly predicted the weakening in super-exchange interactions with the incorporation of Ni 2+ ions in the mixed Li-Ni spinel ferrite [15][16][17]. The current work aims to investigate the effect of Niaddition on the structural and magnetic behaviors of Li-ferrites.…”

Effect of apple cider vinegar agent on the microstructure, phase evolution, and magnetic properties of CoFe2O4 magnetic nanoparticles

“…Cobalt ferrite has the excellent properties including antibacterial characteristics, low toxicity, low cost, mechanical hardness, large crystalline anisotropy, high coercivity, high Curie temperature, moderate saturation magnetization, and considerable chemical and thermal stability that make it as one of the most practical candidates for biomedical applications. The widespread range of its applications in various industries such as data storage devices, sensitive sensors, high density magnetic recorders, targeted drug delivery systems, electronic devices, magnetic resonance imaging, catalysis, and ferrofluids indicates the importance of this material category. Therefore, numerous articles have been published focusing on the improvement of the properties of CFO in recent years.…”