Magnetic and structural properties of Co0.8MnxFe2.2−xO4 (x=0.2, 0.4, 0.6, 0.8) polycrystalline powders synthesized by sol-gel process

Abstract

Co 0.8 Mn x Fe 2.2 − x O 4 (x=0.2, 0.4, 0.6, and 0.8) powders were prepared by a sol-gel process and annealed at different temperatures (Ta=600, 800, 1000, and 1200 °C). X-ray diffractometer results reveal that all the samples are inverse-type spinel with cubic structure. The magnetic properties were measured by vibrating sample magnetometer and the results indicate that the saturated magnetization (Ms) and coercivity (Hc) decrease with increasing Mn content x. The decrease in Ms is related to the magnetic moment of Mn3+ is lower than that of Fe3+. The decrease in Hc is ascribed to the content decrease in Co2+ on B sites. Increasing grain sizes at higher annealing temperature (Ta) also have an intensive influence on Hc.

Elucidation of the Conversion Reaction of CoMnFeO4 Nanoparticles in Lithium Ion Battery Anode via Operando Studies

“…CoMn 2 O 4 , and CoFe 2 O 4 ,, spinels were reported as high-capacity anode materials, but Li uptake into CoMnFeO 4 has not been investigated, yet. CoMnFeO 4 was synthesized as thin films , and as powders for determination of the cation distribution and magnetic and catalytic properties. , Here we report for the first time on the electrochemical performance of CoMnFeO 4 nanoparticles as anode material. Furthermore, we investigate the reaction mechanism during Li insertion into the quaternary spinel by operando synchrotron-based XRD and XAS allowing monitoring the individual structural and electronic events occurring during the reaction.…”

“…CoMn 2 O 4 39,40 and CoFe 2 O 4 30,31,41 spinels were reported as high-capacity anode materials, but Li uptake into CoMnFeO 4 has not been investigated, yet. CoMnFeO 4 was synthesized as thin films 42,43 and as powders for determination of the cation distribution and magnetic and catalytic properties. 44,45 Here we report for the first time on the electrochemical performance of CoMnFeO 4 nanoparticles as anode material.…”

Morphology and magnetic properties of Co0.8Fe2.2O4 films prepared by the chemical solution deposition

“…Cobalt-ferrite Co x Fe 3 À x O 4 (0 rxr1) films have attracted many attentions for decades not only due to their high-electromagnetic performance and excellent chemical stability [1][2][3][4], but also high cubic magnetocrystalline anisotropy, high coercivity, and moderate saturation magnetization [5], which makes them have potential applications in commercial videos, audio tapes, highdensity digital recording media [6][7][8], and magnetic fluids [9].…”

Influence of Mn substitution on crystal structure and magnetocrystalline anisotropy of nanocrystalline Co1−xMn x Fe2−2xMn2xO4

“…Kambale et al (2010) have prepared Co 1-x Mn x Fe 2 O 4 by combustion route and reported that the lattice constant and coercivity increase with the Mn concentration whereas, the saturation magnetization initially increases, then it decrease. Lu et al (2009) have synthesized Co 0.8 Mn x Fe 2.2-x O 4 by sol gel process and showed that the saturation magnetization and coercivity decrease with increase of Mn concentration. Melikhov et al (2006) have studied the magnetic properties of CoMn x Fe 2-x O 4 and observed that saturation magnetization and cubic magnetocrystalline anisotropy decreases with the Mn concentration.…”