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    題名: Formation of crystalline MnFe2O4 powder by flame-combusting freeze-dried citrate precursors
    作者: 余宣賦;Yu, Hsuan-fu;楊尚偉;Yang, Shang-wei
    貢獻者: 淡江大學化學工程與材料工程學系
    關鍵詞: Flame combustion;Magnetic measurement;Citrate precursor;Chemical synthesis;Thermal analysis
    日期: 2005-05
    上傳時間: 2010-03-09 09:54:00 (UTC+8)
    出版者: Elsevier
    摘要: Crystalline MnFe2O4 particles with particle sizes in submicrometers were produced by flame-combusting the freeze-dried citrate precursors. Aqueous solutions of nitrates, containing Fe3+ and Mn2+ chelated by citric acid and with controlled pH using NH4OH additions, were freeze-dried. The freeze-dried citrate precursors were then thermally treated by combustion using a butane-induced flame, to decompose organic constituents and to form ferrites. The resultant particles were characterized using XRD, TG, DSC, FT-IR, SEM, and SQUID. At pH ≥ 3, the flame-combusted specimens were composed of crystalline MnFe2O4 with average crystallite sizes of 28.5 ± 1.2 nm and exhibited magnetic characteristics of 48.7 ± 1.5 emu/g in magnetization measured at 1.5 kOe, 13.4 ± 0.2 emu/g in remanence magnetization, and 55.7 ± 3.9 Oe in coercive force.
    關聯: Journal of Alloys and Compounds 394(1-2), pp.286-291
    DOI: 10.1016/j.jallcom.2004.11.011
    顯示於類別:[化學工程與材料工程學系暨研究所] 期刊論文

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