Annealing temperature effects on the cation distribution in CoFe2O4 nanofibers

Investigation of the catalytic effect of nano ferrite CoCuNiFe2O4 on the thermal decomposition behavior of ammonium nitrate

“…The Raman analysis further confirmed the formation of CoCuNiFe 2 O 4 particles. A total of four Raman active modes ( E g + A 1g + 2 T 2g ) were found for spinel CoCuNiFe 2 O 4 with the Fd 3 m space group because of oxygen–metal cation vibrations in octahedral and tetrahedral sites, 29 which was in accordance with the FTIR results. The third T 2g peak normally observed for ferrite was not observed because of different calcination times as well as metal ion distribution within the crystal lattices.…”

Structural, Optical, Magnetic and Photocatalytic Properties of Zn Doped CoFe2O4 Decorated Bentonite Nanocomposites

“…The Al, Si, O and Fe correspond to octahedral and tetrahedral layers of bentonite, which were the main components of bentonite whereas Fe, Co, O and Zn were attributed to presence of ferrite species. In the high‐resolution Co2p spectrum, two peaks centered at 785 and 788 eV were related to Co2p 3/2 and Co2p 1/2 while the peaks at 798 and 805 eV were attributed shake up satellite peaks, indicating the Co (II) oxidation state in CoZnFeO 4 [58] . In the Fe2p region, two dominant peaks at 713 and 725 eV were related to Fe2p 3/2 and Fe2p 1/2 , showing the presence of Fe 3+ ions in octahedral sites whereas two peaks at 715 and 727 eV were also associated with Fe2p 3/2 and Fe2p 1/2 , demonstrating the existence of Fe 3+ ions in tetrahedral sites [59] .…”

“…In the high-resolution Co2p spectrum, two peaks centered at 785 and 788 eV were related to Co2p 3/2 and Co2p 1/2 while the peaks at 798 and 805 eV were attributed shake up satellite peaks, indicating the Co (II) oxidation state in CoZnFeO 4 . [58] In the Fe2p region, two dominant peaks at 713 and 725 eV were related to Fe2p 3/2 and Fe2p 1/2 , showing the presence of Fe 3 + ions in octahedral sites whereas two peaks at 715 and 727 eV were also associated with Fe2p 3/2 and Fe2p 1/2 , demonstrating the existence of Fe 3 + ions in tetrahedral sites. [59] However, the peaks located at 719 and 735 eV are correspond to satellite peaks with a split of spin-orbit component of 16 eV, verifying the oxidation of Fe ChemistrySelect (III).…”

A review on electrospun magnetic nanomaterials: methods, properties and applications

“…In addition to the increase in particle size, the XPS results suggested that as the calcination temperature increases, the migration of cobalt ions to the tetrahedral sites as well as iron ions to the octahedral sites increases, thus also contributing to the larger M s observed. 189 However, there are examples that do deviate from this trend. For example, the M s values of CuCo 2 O 4 fibres have been found to decrease with increasing calcination temperature.…”