Dielectric and magnetic properties of rare-earth-doped cobalt ferrites and their first-order reversal curve analysis

Synthesis and Characterization of New Ferrite-Lignin Hybrids

“…According to Samad et al [ 44 ], the magnetic properties of spinel ferrites depend on the distribution of the cations on the tetrahedral and octahedral sites of the spinel structure. In our materials, there are twice as many octahedrally as tetrahedrally coordinated transition metal ions in the structure, which means that the magnetic properties of ferrite-lignin hybrids are related to the choice of the divalent cation, Co 2+ , and the distribution of the cationic species, Co 2+ and Fe 3+ , between the crystallographic sites in the spinel structure.…”

Cation trivalent tune of crystalline structure and magnetic properties in coprecipitated cobalt ferrite nanoparticles

“…The metal trivalent ions should partially substitute Fe 3+ in the octahedral site as consequent as Jahn-Teller effect. With the results decrease in the M S magnitude (also the M S (LoA) ) [40,45,65,83]. The calculation results of d e and d JT of CoFe 2 O 4 , CoBi 0.1 Fe 1.9 O 4 , CoLa 0.1 Fe 1.9 O 4 , and CoAl 0.1 Fe 1.9 O 4 nanoparticles are shown in table 6.…”

“…The trivalent cation substitution is one of the important techniques in tuning the physical properties of magnetic nanoparticles, especially for cobalt ferrite. This substitution will replace the Fe 3+ cation in the electronic structure of cobalt ferrite at octahedral and tetrahedral sites [17,18,40]. From a theoretical view point, if the Fe 3+ cation is replaced by some other metal trivalent cation, the change in electronic structure should present similar magnetic properties.…”

“…The difference in the ionic radius of the metal trivalent that replaces Fe 3+ should become a major reason. As a result, the concentration of Fe 3+ at the octahedral sites will decrease [40,47]. Kamran and Anis-ur-Rehman [17] reported the larger the ionic radius that replaces Fe 3+ ions lead to the greater possibility of super-exchange interaction of Fe 3+ ions from the appearances of octahedral to tetrahedral sites.…”

Synthesis and characterization of electrospun Ni0.5Co0.5−xCdAlahmari1, Almessiere2, Slimani3 et al. 2020Nano-Structures & Nano-Objects

“…Many studies reported the effect of Lanthanide element (Ln 3 + ) ions (e.g. Ce, Gd, Dy and La) substitution on the magnetic features of Co-Ni ferrites [19,20]. Among other Ln 3 + ions, Nd 3 + doping has a reduction influence on the saturation magnetization and coercivity on ferrite NPs [21].…”