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Synthesis, Characterization, and Magnetic Properties of Carbon- and Boron-Oxide-Encapsulated Iron Nanocapsules

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Carbon- and boron-oxide-encapsulated iron nanocapsules have been synthesized by arc discharge in methane (CH4) and diborane (B2H6) atmospheres respectively. The characterization and magnetic properties of carbon- and boron-oxide-encapsulated iron nanocapsules [abbreviated as Fe(C) and Fe(B) respectively] were investigated and compared. The structure of the Fe(B) nanocapsules is different from that of the Fe(C) nanocapsules. The Fe(C) nanocapsules consist of a crystalline graphite shell and a core of α-Fe and/or Fe3C. The Fe(B) nanocapsules consist of an amorphous boron-oxide layer and a core of Fe(B) solid solution, α-Fe, -Fe, FeB, and/or Fe3B phases. The saturation magnetizations of both the Fe(C) and the Fe(B) nanocapsules below 300 K decrease monotonically with increasing temperature. The coercivities of the Fe(C) and Fe(B) nanocapsules are almost 2 orders of magnitude higher than that of bulk Fe. The temperature dependence of magnetization at high temperatures indicates the existence of some phase transformations.
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Keywords: BORON-OXIDE-ENCAPSULATED NANOCAPSULES; CARBON-OXIDE-ENCAPSULATED NANOCAPSULES; CHARACTERIZATION; CORE/SHELL STRUCTURE; IRON NANOCAPSULES; MAGNETIC PROPERTIES; NANOPARTICLES

Document Type: Research Article

Affiliations: 1: International Centre for Materials Physics, Institute of Metal Research, Academia Sinica, Shenyang 110016, Peoples' Republic of China 2: Department of Engineering, University of Liverpool, Ashton Street, Liverpool, L69 3GH, United Kingdom 3: Institute of Experimental Physics, Slovak Academy of Sciences, Slovakia 4: Laboratory of Ultrafine Particles, Shenyang Polytechnic University, Shenyang 110023, Peoples' Republic of China

Publication date: 2001-06-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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