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http://dx.doi.org/10.6111/JKCGCT.2020.30.6.226

Crystallization of the NiZn ferrite nanofibers fabricated by electrospinning method  

Na, Kyeong-Han (Dept. of Advanced Materials Engineering, Gangneung-Wonju National University)
Yoo, Sun-Ho (Dept. of Advanced Materials Engineering, Gangneung-Wonju National University)
Song, Tae-Hyub (Korea Institute of Civil Engineering and Building Technology)
Kim, Sung-Wook (Korea Institute of Civil Engineering and Building Technology)
Choi, Won-Youl (Dept. of Advanced Materials Engineering, Gangneung-Wonju National University)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.30, no.6, 2020 , pp. 226-231 More about this Journal
Abstract
Polyvinyl pyrrolidone nanofibers including nickel, zinc, and iron precursors were fabricated via the electrospinning method. To convert as-spun nanofibers to Ni0.5Zn0.5Fe2O4 oxide nanof ibers which is capable of shielding an electromagnetic wave, heat treatment conditions were optimized. To obtain the heat treatment condition that can exclude amorphous carbon black and secondary crystal phase, samples were taken at each temperature while the calcination process and analyzed. According to the X-ray diffraction (XRD) analysis, the Ni0.5Zn0.5Fe2O4 crystal phase started to appear from 300℃, but it was confirmed through energy dispersive spectroscopy (EDS) analysis that heat treatment of 500℃ or more was required to remove most of the carbon black. When the calcination temperature exceeds 650℃, crystal nuclei starts to grow and the fiber surface condition becomes rough, so it was confirmed that the heat treatment conditions should be selectively determined according to the application field.
Keywords
Nanofibers; Electrospinning; Ferrite; $Ni_{0.5}Zn_{0.5}Fe_2O_4$;
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