Preparation and Magnetic Properties of Cobalt-Doped FeMn2O4 Spinel Nanoparticles

Abstract

Mixed-metal oxide nanoparticles have attracted great scientific interest since they find applications in many fields. However, the synthesis of size-controlled and composition-tuned mixed-metal oxide nanoparticles is a great challenge that complicates their study for practical application. In this study, Co-doped FeMn2O4 nanoparticles were synthesized by the solvothermal method in which the crystallization was carried out under autogenous pressure at temperatures of 190 °C for 24 h. The influence of Co doping on the evolution of the structural and magnetic properties was investigated by various methods. It was found from XRD data that crystallite size decreases from 9.1 to 4.4 nm with the increase in Co content, which is in good agreement with the results of TEM. Based on the results of magnetic measurements, it was found that the saturation magnetization first increases with an increase in the cobalt content and reaches its maximum value at x = 0.4, and a further increase in x leads to a decrease in the saturation magnetization. The influence of cation redistribution on the observed changes has been discussed.

Sputtered (Fe,Mn)3O4 Spinel Oxide Thin Films for Micro-Supercapacitor

“…x 10 -2 and 5 x 10 -2 mbar respectively. These values, close to the theoretical one (8.511 Å), slightly increase with the deposition pressure, are consistent with previous studies reported in the literature [64]- [66]. The electrochemical behaviour of the different films exhibits quasi-rectangular CV curves at the various pressures, typically observed for a capacitive material (Fig.…”

Facile Synthesis of Chromium-Doped Fe1.1Mn1.9O4 Nanoparticles and the Effect of Cr Content on Their Magnetic and Structural Properties

“…Additional interest in studying spinel ferrites is due to the possibility of tailoring the properties by cation substitution, increasing their practical application opportunities. In particular, the influence of various cations on the properties of Mn x Fe 3-x O 4 nanoparticles has been discussed in the literature, including the effect of La and Sm on photocatalytic properties [23,24]; Mo, Cr, and Zn on dielectric properties [25][26][27][28]; Cu, Co, and Dy on magnetic properties [29][30][31][32]; and so on. However, most studies have discussed the effect of substitution on the properties of the Mn x Fe 3-x O 4 system in the iron-rich region, especially on the properties of manganese ferrite, while the literature data on the study of the manganeserich region (x~2) are limited.…”

Fe3+ in a tetrahedral position determined the electrocatalytic properties in FeMn2O4

“…[15][16][17][18] Mnbased spinels such as CoMn 2 O 4 , CuMn 2 O 4 and NiMn 2 O 4 were studied as OER catalysts. [19][20][21][22][23][24][25][26] It has been reported that MnFe 2 O 4 , one of the Fe-Mn spinels, is a stable OER catalyst. In such a magnetic ferrite, Mn ions mostly occupy A sites and Fe ions mainly occupy B sites.…”