Skip to main content
×
Home
    • Aa
    • Aa

Synthesis and Characterization of FeCoNiAl Nanocapsules by Plasma arc Discharge Process

  • Dian-Yu Geng (a1), Woo-Young Park (a2), Jin-Chun Kim (a2), Ji-Hun Yu (a2), Chul-Jin Choi (a2) and Zhi-Dong Zhang (a3)...
Abstract

A series of magnetic FeCoNiAl nanocapsules was synthesized by the plasma arc discharge method; the targets of Fe, Co, Ni, and Al powders were changed with varying compositions. The compositions of the nanocapsules were found to be quite different from those of the corresponding targets; the relative amount of Al (or Ni, Co) to Fe was increased (or decreased). Structures, particles sizes, composition, surface composition, magnetic properties, and thermal stability of the nanocapsules were investigated. The saturation magnetization Ms = 106.8 emu/g and coercive force iHc = 367 Oe were achieved for the nanocapsules with the Fe62.5Co21Ni13Al2.5 target. In the FeCoNiAl nanocapsules, the binding energies of Fe, Co, and Ni were different from those of the metals Fe, Co, and Ni. The binding energies of Fe2p3/2 and Fe2p1/2 of the nanocapsules were 708.2 and 721.3 eV, respectively. The four-layer structure was proposed to give a clear statement of how the composition and phase varied radially in the nanocapsules. The major contents of the four layers—i.e., the outer shell, the inner shell, the outer core and the inner core—were amorphous alumina, crystalline alumina, transition metal oxides, and transition metal alloy, respectively. The compositions, structures, particle size, and grain size of the nanocapsules all affect their magnetic properties. In the FeCoNiAl nanocapsules, the greater th amount of the body-centered-cubic phase, the stronger the ferromagnetic magnetic properties.

Copyright
Corresponding author
a) Address all correspondence to this author. e-mail: dygeng@imr.ac.cn
Linked references
Hide All

This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

2Y. Saito : Nanocapsules and filled nanocapsules. Carbon 33, 979 (1995).

3J. Li , C.Y. Liu , B.G. Zhao , Y.Q. Lin and Z.J. Deng : Structures and properties of Fe-C fine particles prepared by ac arc discharge. J. Magn. Magn. Mater. 195, 470 (1999).

4X.L. Dong , Z.D. Zhang , S.R. Jin and B.H. Kim : Carbon-coated Fe–Co(C) nanoparticles prepared by arc-discharge in methane. J. Appl. Phys. 86, 6701 (1999).

5Z.D. Zhang , J.G. Zheng , I. Škorvánek , G.H. Wen , J. Kováč , F.W. Wang , J.L. Yu , Z.J. Li , X.L. Dong , S.R. Jin , W. Liu and X.X. Zhang : Shell/core structure and magnetic properties of carbon-coated FeCo(C) nanocapsules. J. Phys. Condens. Matter 13, 1921 (2001).

6X.L. Dong , Z.D. Zhang , X.G. Zhao , Y.C. Chuang , S.R. Jin and W.M. Sun : Surface characterization and magnetic properties of ultrafine Fe–Ni(C) particles. J. Mater. Res. 14, 1782 (1999).

7X.G. Li and S. Takahashi : Synthesis and magnetic properties of Fe-Co-Ni nanoparticles by hydrogen plasma-metal reaction. J. Magn. Magn. Mater. 214, 195 (2000).

8D.Y. Geng , Z.D. Zhang , W.S. Zhang , P.Z. Si , X.G. Zhao , W. Liu , K.Y. Hu , Z.X. Jin and X.P. Song : Al2O3 coated α–Fe solution nanocapsules prepared by arc discharge. Scripta Mater. 48, 593 (2003).

10Y.B. Pithawalla , M.S. Elshall and S.C. Deevi : Synthesis and characterization of nanocrystalline iron aluminide particles. Intermetallics 8, 1225 (2000).

11J.D. Hang and Y.S. Yang : Handbook of Magnetic Materials (III) (Metallurgic Press, Beijing, China, 1985), pp. 446, 448 (in Chinese).

Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Journal of Materials Research
  • ISSN: 0884-2914
  • EISSN: 2044-5326
  • URL: /core/journals/journal-of-materials-research
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Keywords: