Structural and magnetic properties of MgFe2O4 nanopowder synthesized via co-precipitation route

Abstract

Mg ferrite was successfully synthesized by adopting a simple co-precipitation route. A physical property of Mg ferrite has been investigated employing XRD, FTIR, SEM, EDS, AFM and Raman spectroscopic techniques. The XRD results indicated the formation of single phase spinel ferrite with crystalline size of 36 nm. FTIR results confrmed ferrite tetrahedral (580 cm −1) and octahedral sites (430 cm −1) metal oxygen vibrations. The Raman result revealed the well defined Raman active modes of synthesized sample. Scanning electron microscopic (SEM) studies revealed nano crystalline nature of the sample. An elemental composition of the sample was studied by energy dispersive spectroscopy (EDS). Crystallite size, X-ray density, hopping length, and magnetic properties of the product are also reported. AFM provides surface roughness. The magnetic hysteresis curves clearly indicate the soft nature of the prepared nanoferrite. The Raman spectra shows five Raman active modes (A 1g + E g + 3F 2g) which are expected in the spinel structure and Raman spectra has a very good agreement with reported data. Various magnetic parameters such as saturation magnetization (M s), and remanence (M r) and coerciviy (H c) are obtained from the hysteresis loops.

Silver Doped Magnesium Ferrite Nanoparticles: Physico-Chemical Characterization and Antibacterial Activity

“…Rietveld structural and profile refinements were performed on all the patterns to determine the main structural parameters, on the basis of the known crystallographic models of magnesium spinel and metallic silver phases. It must be recalled that MgFe 2 O 4 is an inverse spinel, with the inversion degree (I) defined as the amount of the trivalent cations on tetrahedral sites [ 22 , 25 , 26 ]. During refinements, the occupancy factors were also varied to verify the influence of nanoscale and thermal treatment on the cation distribution.…”

“…The lattice parameters, crystallite sizes of spinel and silver, inversion degree and secondary phase’s amount are also reported in Table 1 and Table 2 . The lattice parameters slightly increased with Ag doping and with thermal treatment [ 25 ], but they were practically the same for the MW and SG series of samples. On the other hand, silver does not substitute onto spinel cationic sites (except for SG-1 and, to some extent, for SG-3, for which a slight increase could in fact be appreciated), thus, the main differences were due to oxygen vacancy formation, to balance the lack of positive charges, producing lattice relaxation.…”

“…Among the different ferrites, MgFe 2 O 4 has peculiar magnetic and physical properties that lead to its wide application in medicine. The antibacterial activity of magnesium-based nanoparticles is attributed to the generation of ROS [ 22 , 23 , 24 , 25 , 26 ].…”

Cation Distributions and Magnetic Properties of Ferrispinel MgFeMnO4

“…Such magnetic properties also play an essential role in the application within, for example, magnetic resonance imaging, data storage, and drug delivery systems. 4 , 8 …”

Cation Distributions and Magnetic Properties of Ferrispinel MgFeMnO4

“…These magnetic properties play an essential role in the application of magnetic resonance imaging, data storage and drugs delivery. 4,8 Spinels have the general formula AB 2 O 4 , and most of them are reported to have a cubic structure with space group F d3m. The structure consists of tetrahedrally coordinated A site cations at 8a (1/8, 1/8, 1/8), octahedrally coordinated B sites cations at 16d (1/2, 1/2, 1/2), and O atoms on the body diagonals of a cube at 32e (u, u, u), where u is approximately 1/4.…”