Effects of calcination temperature on structure and magnetic properties of pure FeCo2O4 powders

Advances in Electrochemical and Catalytic Performance of Nanostructured FeCo2O4 and Its Composites

“…Next, this material with a band gap of 2.74 eV [26] is also found to exhibit remarkable magnetic behaviour with high Curie temperature, excellent coercivity, and medium saturation magnetisation [32] . The magnetic hysteresis loop of FeCo 2 O 4 , reveals its ferromagnetic behaviour at room temperature [24] .…”

“…[19] Next, this material with a band gap of 2.74 eV [26] is also found to exhibit remarkable magnetic behaviour with high Curie temperature, excellent coercivity, and medium saturation magnetisation. [32] The magnetic hysteresis loop of FeCo 2 O 4 , reveals its ferromagnetic behaviour at room temperature. [24] While, in context to the electrical properties, FeCo 2 O 4 spinel oxide pelleted electrodes, obtained using low temperature coprecipitation method, exhibit semi-conductor like behaviour in the range of 530 K-340 K with~0.7 eV of activation energy for conduction [27] along with high resistivity to corrosion.…”

“…has proposed FeCo 2 O 4 to be an inverse spinel. Several other studies, such as those based upon Mössbauer spectroscopy, [29–31] and neutron diffraction [32] reported it to be partially inverse spinel. Whereas, by using the magnetic properties, Blasse [33] and Lotgering [34] reported FeCo 2 O 4 to be a normal spinel, i. e., Co 2+ [Fe 3+ Co 3+ ]O 4 where the B sites are occupied by the cations in the bracket.…”

“…[39] Above or below this range, FeCo 2 O 4 is reported to decompose into Co-rich or Fe-rich phases. [32,41] FeCo 2 O 4 is reported to disproportionate into Fe-rich and Co-rich phases in alkaline solution as well. These shortcomings restrict the wide-scale application of this material into various fields of interest, as would be discussed subsequently.…”

“…Pure phase of FeCo 2 O 4 is reported to exist only in a narrow temperature range around ∼900 °C, wherein the anti‐ferromagnetism and ferrimagnetism co‐exist [39] . Above or below this range, FeCo 2 O 4 is reported to decompose into Co‐rich or Fe‐rich phases [32,41] . FeCo 2 O 4 is reported to disproportionate into Fe‐rich and Co‐rich phases in alkaline solution as well.…”