Cation distribution dependence of magnetic properties of sol–gel prepared MnFe2O4 spinel ferrite nanoparticles

Influence of annealing temperature on structural and magnetic properties of MnFe2O4 nanoparticles

“…Manganese ferrites belong to ferrites with partially inverse spinel structure where both cation sublattices are occupied by manganese and iron. The degree of inversion depends on the preparation method and on thermal treatment [10]. Generally, the Mössbauer spectra should consist of two sets of the sextets related to existence of the 57 Fe ions at the two nonequivalent sites.…”

An Overview on Nanocrystalline ZnFe2O4, MnFe2O4, and CoFe2O4 Synthesized by a Thermal Treatment Method

“…Intersublattice superexchange interactions of the cations on the (A-B) are much stronger than the (A-A) and (B-B) intrasublattice exchange interactions [4,33]. As discussed earlier (Figure 2(b)), by increasing the calcination temperature of the MnFe 2 O 4 nanoparticles, Fe 3+ ions transferred from B site to A site, so, consequently, the accumulation of Fe 3+ ions increased in A site; however, the Fe A 3+ -Fe B 3+ superexchange interactions increased (Fe A 3+ -Fe B 3+ interactions were twice as strong as the Mn A 2+ -Fe B 3+ interactions), and this can lead to an increase in saturation magnetization in MnFe 2 O 4 nanoparticles [34]. Aslibeiki et al [35] showed that saturation magnetization increases with increasing temperature and particle size in MnFe 2 O 4 nanoparticles.It has been reported [36] that the spin disorder may occur on the surface of the nanoparticles as well as within the cores of the nanoparticles due to vacant sublattice disorder sites (Fe A 3+ ) and poor crystal structure.…”

Synthesis and comparative studies of MnFe2O4 nanoparticles with different natural polymers by sol–gel method: structural, morphological, optical, magnetic, catalytic and biological activities

“…The materials in nanoscale can penetrate into bacterial cells and produce toxic oxygen radicals to damage cell membranes of microbes that produce an efficient inhibition bacterial growth [4][5][6][7]. Spinel structure ferrite nanoparticles creates a great impact among the science researchers because of its wide applications in magnetic resonance imaging, magnetic storage devices, biotechnology, electronics, magnetic drug delivery [8][9][10], etc. Magnetic nanoparticles possess excellent super-paramagnetic property due to large surface-to-volume ratio of the nanoparticles and they require super-paramagnetic character at room temperature for many applications [11][12][13][14].…”