Structure and Magnetic Properties of Boron-oxide and Boron-nitride Coated Iron Nanocapsules

J Mater Sci Technol ›› 2010, Vol. 26 ›› Issue (11): 1051-1056.

• Nanomaterials and Nanotechnology • Previous Articles

Structure and Magnetic Properties of Boron-oxide and Boron-nitride Coated Iron Nanocapsules

W.S. Zhang^1,2), J.G. Zheng³⁾, E. Brück⁴⁾, P.Z. Si¹⁾, D.Y. Geng¹⁾, Z.D. Zhang¹⁾

1) Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, China and International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, China
2) College of Physics & Electronic Engineering, Taizhou University, Taizhou 317000, China
3) Electron Probe Instrumentation Center (EPIC), Northwestern University, 2225N Campus Drive, 1156 MLSF, Evanston IL 60208-3108, USA
4) Van derWaals-Zeeman Instituut, Universiteit van Amsterdam, Valckenierstraat 65, 1018 XE Amsterdam, The Netherlands

Received:2009-09-10 Revised:2010-07-12 Online:2010-11-30 Published:2010-11-22
Contact: W.S. Zhang
Supported by:
the National Basic Research Program (No. 2010CB934603) of China, Ministry of Science and Technology China, the National Natural Science Foundation of China under Grant No. 50831006, the Natural Science Foundation of Zhejiang Province under Grant No. Y407172.

Abstract

Abstract: The boron-oxide coated iron nanocapsules have been prepared by arc-discharge in a mixture of diborane and nitrogen, and then the boron-nitride coated iron nanocapsules by a subsequent annealing under a nitrogen atmosphere at 1100°C. After the arc-discharge, the boron-oxide coated iron nanocapsules form, which show an amorphous surface layer of B₂O₃ (and/or B) and a core of γ-Fe, α-Fe, FeB phases. After being annealed, part of the α-Fe phase transforms to the γ-Fe phase, and the FeB phase decomposes while the BN phase forms. The BN shell structure formed in the BN encapsulating iron nanocapsules is incomplete. Magnetic properties of the boron-oxide coated and the boron-nitride coated iron nanocapsules were compared and discussed in terms of the particles sizes, the phase components, and the surface structures.

Key words: Arc discharge, Nanocapsules, Magnetic properties

W.S. Zhang, J.G. Zheng, E. Bruck, P.Z. Si, D.Y. Geng, Z.D. Zhang. Structure and Magnetic Properties of Boron-oxide and Boron-nitride Coated Iron Nanocapsules[J]. J Mater Sci Technol, 2010, 26(11): 1051-1056.

References

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Structure and Magnetic Properties of Boron-oxide and Boron-nitride Coated Iron Nanocapsules

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