Fabrication and magnetic properties of Ni0.50.5Zn0.5Fe2O4 nanofibres by electrospinning |
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Authors: | Xiang Jun Shen Xiang-Qian Song Fu-Zhan and Liu Ming-Quan |
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Institution: | School of Materials Science and Engineering, Jiangsu
University, Zhenjiang 212013, China |
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Abstract: | NiZn ferrite/polyvinylpyrrolidone composite fibres were
prepared by sol--gel assisted electrospinning.
Ni0.5Zn0.5Fe2O4 nanofibres with a pure cubic
spinel structure were obtained subsequently by calcination of the
composite fibres at high temperatures. This paper investigates the
thermal decomposition process, structures and morphologies of the
electrospun composite fibres and the calcined
Ni0.5Zn0.5Fe2O4 nanofibres at different
temperatures by thermo-gravimetric and differential thermal
analysis, x-ray diffraction, Fourier transform infrared spectroscopy
and field emission scanning electron microscopy. The magnetic
behaviour of the resultant nanofibres was studied by a vibrating
sample magnetometer. It is found that the grain sizes of the nanofibres
increase significantly and the nanofibre morphology gradually
transforms from a porous structure to a necklace-like nanostructure
with the increase of calcination temperature. The
Ni0.5Zn0.5Fe2O4 nanofibres obtained at 1000~℃
for 2~h are characterized by a necklace-like morphology and
diameters of 100--200~nm. The saturation magnetization of the random
Ni0.5Zn0.5Fe2O4 nanofibres increases from 46.5
to 90.2~emu/g when the calcination temperature increases from 450 to
1000~\du. The coercivity reaches a maximum value of 11.0~kA/m at a
calcination temperature of 600~\du. Due to the shape anisotropy, the
aligned Ni0.5Zn0.5Fe2O4 nanofibres exhibit an
obvious magnetic anisotropy and the ease magnetizing direction is
parallel to the nanofibre axis. |
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Keywords: | NiZn ferrite nanofibre electrospinning magnetic
property shape anisotropy |
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