Magnesium Ferrite (MgFe2O4) Nanostructures Fabricated by Electrospinning

Khon Kaen University Department of Physics, Faculty of Science, Small & Strong Materials Group (SSMG) Khon Kaen 40002 Thailand
Nanoscale Research Letters (Impact Factor: 2.78). 03/2008; 4(3):221-228. DOI: 10.1007/s11671-008-9229-y
Source: PubMed


Magnesium ferrite (MgFe(2)O(4)) nanostructures were successfully fabricated by electrospinning method. X-ray diffraction, FT-IR, scanning electron microscopy, and transmission electron microscopy revealed that calcination of the as-spun MgFe(2)O(4)/poly(vinyl pyrrolidone) (PVP) composite nanofibers at 500-800 degrees C in air for 2 h resulted in well-developed spinel MgFe(2)O(4) nanostuctures. The crystal structure and morphology of the nanofibers were influenced by the calcination temperature. Crystallite size of the nanoparticles contained in nanofibers increased from 15 +/- 4 to 24 +/- 3 nm when calcination temperature was increased from 500 to 800 degrees C. Room temperature magnetization results showed a ferromagnetic behavior of the calcined MgFe(2)O(4)/PVP composite nanofibers, having their specific saturation magnetization (M(s)) values of 17.0, 20.7, 25.7, and 31.1 emu/g at 10 Oe for the samples calcined at 500, 600, 700, and 800 degrees C, respectively. It is found that the increase in the tendency of M(s) is consistent with the enhancement of crystallinity, and the values of M(s) for the MgFe(2)O(4) samples were observed to increase with increasing crystallite size.

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    • "This may be due to the stretching vibrations between the oxygen atoms and the metal cations (Fe-O) [23] [37] [39]. Based on the above results, we can deduce that PVP have totally decomposed. "
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    ABSTRACT: In this study, we successfully synthesized magnesium ferrite (MgFe2O4) nanofibers by a facile electrospinning technique followed by calcining at 800 °C. The lithium storage properties of MgFe2O4 nanofibers as anode materials for lithium-ion batteries have been discussed for the first time. It is demonstrated that MgFe2O4 nanofibers electrode not only deliver a high initial discharge capacity of around 1304 mAh g−1, but also maintain a reversible capacity of 714 mAh g−1 after 100 cycles. Moreover, the MgFe2O4 nanofibers electrode also exhibits high capacity at higher charge/discharge rate. Even at a current density of 2000 mA g−1, the reversible capacity can attain 409 mAh g−1 after 100 cycles, suggesting its excellent rate capability. The superior lithium storage properties of the MgFe2O4 nanofibers electrode may be related to the unique continuous fibrous morphologies, nanostructured architectures, porous structures, and large specific surface area, which provide an easily Li+ diffusion path and promote electron transfer. In addition, the formation of MgO appears to act as a buffer layer that prevents agglomeration of nanocrystalline, accommodate the large volume change and reduces polarization during cycling.
    Electrochimica Acta 02/2015; 160. DOI:10.1016/j.electacta.2015.02.012 · 4.50 Impact Factor
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    • "The increase in calcination temperature leads to the increase in the size of crystal. Recently, they are used in compact and lightweight and high efficiency switching power supplies.[13] [14]. "
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    ABSTRACT: Nanocrystalline form of manganese ferrite (MnFe2O4) has been synthesized by simple sol-gel auto combustion method using citric acid as chelating agent. The obtained nanocrystalline powders of manganese ferrite were subjected to structural and magnetic measurements. Temperature dependent magnetization was also carried out for the single phase nanocrystalline manganese ferrite and the results have been discussed in detail.
    Physics Procedia 12/2014; 54. DOI:10.1016/j.phpro.2014.10.053
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    ABSTRACT: In the present work, magnetic nanocomposites of the multi-walled carbon nanotubes (MWCNTs) decorated with magnesium ferrite (MgFe 2 O 4) nanoparticles were synthesized successfully by citrate-gel method. The shape, structure, size, and properties of the as-synthesized sample were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction pattern (XRD), transmission electron microscope (TEM), vibrating sample magnetometry (VSM), and AC susceptibility measurements. The results showed that MWCNTs and MgFe 2 O 4 coexisted in the nanocomposite and a large number of the high purity magnesium ferrite MgFe 2 O 4 nanoparticles were attached on the surface of the MWCNTs. The hysteresis loop of the MgFe 2 O 4 /MWCNTs nanocomposites showed that the nanocomposites were superparamagnetic with the saturated magnetization of 11.79 emu/g, and the coercive of 49 Oe.
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