Characterization and magnetic properties of nanocrystalline CuFe2O4, NiFe2O4, ZnFe2O4 powders prepared by the Aloe vera extract solution

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

“…These interactions are similar to the stabilization of metallic nanoparticles, that is, silver and gold [16,17]. [18][19][20].…”

“…Hence, saturation magnetization increases for smaller size particles [31], using Mossbauer's experiment, showed that the degree of inversion is large in the case of smaller size particles. Also, an impure α-Fe 2 O 3 phase was detected by XRD (Figure 2(a)), the heating rate of calcinations and the surface spin structure can be an influence that increases the saturation magnetization in smaller size particles [18]. Figure 8 shows the curves of magnetization of precursor and MnFe 2 O 4 nanoparticles which exhibited a typical superparamagnetic behavior.…”

“…Sangmanee and Maensiri [42] showed that saturation magnetization increases from 9.7 to 56.5 emu/g with decreasing the heating rate of calcination from 20 K/min to 5 K/min in cobalt ferrite nanostructures calcined at 773 K and fabricated by electrospinning. In addition, the appearance of the weakly magnetic, impure phase of α-Fe 2 O 3 (shown in Figure 2(c)) can reduce the saturation magnetization [18]. Also, the cation site occupancy in CoFe 2 O 4 nanoparticles is different than in the bulk [43].…”

“…In fact, since the nanoparticles are the mixed spinel structure type rather than the inverse spinel structure type (bulk) because of the presence of Co 3+ ions and also a cation distribution with cobalt ions on the tetrahedral site [44], the saturation magnetization is reduced [45]. In addition, the appearance of the weakly magnetic, impure phase of hematite (shown in Figure 2(c)) can reduce the saturation magnetization [18,46]. The variations of saturation magnetization and coercivity field with particle size and calcination temperature for cobalt ferrite nanoparticles are listed in Table 1.…”

Influence of Ph and Calcination Temperature on Magnetic Properties of Nanosized Zn-Ferrite Synthesized by Sol–gel Citrate Method

“…Spinel ferrites have been widely used in many technological applications because of their excellent optical, electronic and magnetic properties for last many years [1,2]. Recent advances in the synthesis techniques for the production of ferrites have initiated interest in ferrites in order to improve their physical properties and expand their applications [1].…”