Superspin glass state in MnFe2O4 nanoparticles

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

“…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. The other point that is understood from Table 1 is that the values of saturation magnetization are expressively lower than those reported for the bulk MnFe 2 O 4 (80 emu/g) [37].…”

Role of polymeric surfactants on the growth of manganese ferrite nanoparticles

“…Manganese ferrite nanoparticles with different sizes and morphologies have been synthesized by different methods. Some of these methods include ball milling [20], co-precipitation of Mn 2+ and Fe 3+ in aqueous solution [21], reverse micelle [22,23], thermal decomposition [24][25][26][27], and solvothermal method [19]. The last method offers many advantages over the others such as its simplicity, high crystallinity of the products, capability to control the crystal growth and its adequacy for the preparation of large quantities of samples [19].…”

Role of Mn2+ Doping on Structural, Morphological, and Opto-Magnetic Properties of Spinel Mn x Co1−x Fe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) Nanocatalysts

“…Several methods such as hydrothermal [13,14], coprecipitation [15], thermal decomposition [16], sol-gel [17], and ball milling [18] techniques are usually employed for the preparation of spinel ferrites. The above methods have some disadvantages, such as a synthesis time duration that is too long, energy consumption, and the need for a very high temperature calcination step, and hence, further development of these methods is restricted to a certain extent.…”