کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10260597 | 438977 | 2005 | 17 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microstructure of iron particles reduced from silica-coated hematite in hydrogen
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کلمات کلیدی
Gel-sol methodIron particles - ذرات آهنHematite particles - ذرات هماتیتCore-shell structure - ساختار هسته پوستهMicrostructure - ساختار(بافت) ذره ای و کوچکhigh-resolution transmission electron microscopy - میکروسکوپ الکترونی انتقال با وضوح بالاElectron diffraction - پراش الکترونیsilica coating - پوشش سیلیکاHydrogen reduction - کاهش هیدروژن
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Poly- and nearly monocrystalline hematite particles having diameters of around 2 and 0.1 μm, respectively, were prepared by the gel-sol method and coated with a uniform silica layer by the sol-gel method. The core in the silica shell was reduced to iron without agglomerate formation between the particles by using a hydrogen stream. The microstructure and morphology of these cores and the silica layers were examined by high-resolution transmission electron microscopy, and electron and X-ray diffraction analysis. In hematite particles, around 2 μm in diameter, the reduced products were mostly α-Fe, but partially magnetite. In hematite particles, around 0.1 μm in diameter, only α-Fe was observed. Most of the raw hematite and iron particles produced were monocrystalline, and part of core grew hexagonal prism-shaped monocrystalline particles. In the case of the growth of a crystal to a hexagonal prism, a nanometer-scaled space at the interface between the iron crystal core and the silica layer was discovered.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Advanced Powder Technology - Volume 16, Issue 6, 2005, Pages 621-637
Journal: Advanced Powder Technology - Volume 16, Issue 6, 2005, Pages 621-637
نویسندگان
Yuichi Yonemochi, Motoyuki Iijima, Mayumi Tsukada, Hua Jiang, Esko I. Kauppinen, Mitsumasa Kimata, Masahiro Hasegawa, Hidehiro Kamiya,