Crystallization of MgFe2O4 from a glass in the system K2O/B2O3/MgO/P2O5/Fe2O3 |
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| Affiliation: | 1. School of Material Science and Engineering, University of Jinan, Jinan, China;2. Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong, China;1. National Energy Technology Laboratory, 3610 Collins Ferry Rd., Morgantown, WV 26507, USA;2. URS, National Energy Technology Laboratory, 3610 Collins Ferry Rd., Morgantown, WV 26507, USA;1. Laboratory of Green Chemistry, Faculty of Technology, Lappeenranta University of Technology, Sammonkatu 12, FI-50130 Mikkeli, Finland;2. Department of Chemistry, Indian Institute of Technology, Banaras Hindu University, Varanasi 221005, India;1. College of Science, Industrial Chemistry, Tikrit University, Salah Aldeen, Tikrit 34001, Iraq;2. College of Petroleum Processes Engineering, Petroleum & Gas Refining Engineering, Tikrit University, Salah Aldeen, Tikrit 34001, Iraq;3. Kingston University London, School of LSPC, Kingston upon Thames KT1 2EE, UK |
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| Abstract: | 
Spherical magnetic Mg-Fe-O nanoparticles were successfully prepared by the crystallization of glass in the system K2O/B2O3/MgO/P2O5/Fe2O3. The magnetic glass ceramics were prepared by melting the raw materials using the conventional melt quenching technique followed by a thermal treatment at temperatures in the range 560–700 °C for a time ranging from 2 to 8 h. The studies of the X-ray diffraction, electron microscopy and FTIR spectra confirmed the precipitation of finely dispersed spherical (Mg, Fe) based spinel nanoparticles with a minor quantity of hematite (α-Fe2O3) in the glass matrix. The average size of the magnetic nano crystals increases slightly with temperature and time from 9 to 15 nm as determined by the line broadening from the XRD patterns. XRD studies show that annealing the glass samples for long periods of time at temperature ≥604 °C results in an increase of the precipitated hematite concentration, dissolution of the spinel phase and the formation of magnesium di-borate phase (Mg2B2O5). For electron microscopy, the particles were extracted by two methods; (i) replica extraction technique and (ii) dissolution of the glass matrix by diluted acetic acid. An agglomeration of the nano crystals to larger particles (25–35 nm) was observed. |
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| Keywords: | Glass crystallization Magnetic glass ceramic Magnesium ferrite X-ray diffraction Microstructure |
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