淡江大學機構典藏:Item 987654321/44117
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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/44117


    Title: Formation of crystalline MnFe2O4 powder by flame-combusting freeze-dried citrate precursors
    Authors: 余宣賦;Yu, Hsuan-fu;楊尚偉;Yang, Shang-wei
    Contributors: 淡江大學化學工程與材料工程學系
    Keywords: Flame combustion;Magnetic measurement;Citrate precursor;Chemical synthesis;Thermal analysis
    Date: 2005-05
    Issue Date: 2010-03-09 09:54:00 (UTC+8)
    Publisher: Elsevier
    Abstract: 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.
    Relation: Journal of Alloys and Compounds 394(1-2), pp.286-291
    DOI: 10.1016/j.jallcom.2004.11.011
    Appears in Collections:[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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