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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)...


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.


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1Zhang, Z.D. Nanocapsules, in Encyclopedia of Nanoscience and Nanotechnology VI, edited by Nalwa, H.S., (American Scientific Publishers, Stevenson Ranch, CA, 2004), pp. 77 and 79.
2Saito, Y.: Nanocapsules and filled nanocapsules. Carbon 33, 979 (1995).
3Li, J., Liu, C.Y., Zhao, B.G., Lin, Y.Q. and Deng, Z.J.: Structures and properties of Fe-C fine particles prepared by ac arc discharge. J. Magn. Magn. Mater. 195, 470 (1999).
4Dong, X.L., Zhang, Z.D., Jin, S.R. and Kim, B.H.: Carbon-coated Fe–Co(C) nanoparticles prepared by arc-discharge in methane. J. Appl. Phys. 86, 6701 (1999).
5Zhang, Z.D., Zheng, J.G., Škorvánek, I., Wen, G.H., Kováč, J., Wang, F.W., Yu, J.L., Li, Z.J., Dong, X.L., Jin, S.R., Liu, W. and Zhang, X.X.: Shell/core structure and magnetic properties of carbon-coated FeCo(C) nanocapsules. J. Phys. Condens. Matter 13, 1921 (2001).
6Dong, X.L., Zhang, Z.D., Zhao, X.G., Chuang, Y.C., Jin, S.R. and Sun, W.M.: Surface characterization and magnetic properties of ultrafine Fe–Ni(C) particles. J. Mater. Res. 14, 1782 (1999).
7Li, X.G. and Takahashi, S.: Synthesis and magnetic properties of Fe-Co-Ni nanoparticles by hydrogen plasma-metal reaction. J. Magn. Magn. Mater. 214, 195 (2000).
8Geng, D.Y., Zhang, Z.D., Zhang, W.S., Si, P.Z., Zhao, X.G., Liu, W., Hu, K.Y., Jin, Z.X. and Song, X.P.: Al2O3 coated α–Fe solution nanocapsules prepared by arc discharge. Scripta Mater. 48, 593 (2003).
9Geng, D.Y., Kim, J.C., Choi, C.J., Chen, C.L., Zhao, X.G. and Zhang, Z.D.: Synthesis and characterization of nanocapsules of α–Fe(NiCoAl) solid-solution. J. Mater. Sci. Technol. 3, 297 (2005).
10Pithawalla, Y.B., Elshall, M.S. and Deevi, S.C.: Synthesis and characterization of nanocrystalline iron aluminide particles. Intermetallics 8, 1225 (2000).
11Hang, J.D. and Yang, Y.S.: Handbook of Magnetic Materials (III) (Metallurgic Press, Beijing, China, 1985), pp. 446, 448 (in Chinese).
12Ohno, S. and Uda, M.: Generation rate of ultrafine metal particles in hydrogen plasma-metal reaction. Trans. Jpn. Inst. Met. 48, 640 (1984).
13Guo, Z.Y. and Zhao, W.H.: Electric Arc and Hot Plasma (Science Press, Beijing, China, 1986), p. 17 (in Chinese).
14Zhang, Z.X.: Handbook of Physical Constants (Science Press, Beijing, China, 1979), p. 84.
15Moulder, J.F., Stickle, W.F., Sobol, P.E. and Bomben, K.D.: Handbook of X-ray Photoelectron Spectroscopy, edited by Chastain, Jill (Perkin-Elmer Corporation, Physical Electronics Division, Eden Prairie, MN, 1992), pp. 25, 55, 81, 83, 85.
16Descostes, M., Mercier, F., Thromat, N., Beaucaire, C. and Gautier-Soyer, M.: Use of XPS in the determination of chemical environment and oxidation state of iron and sulfur samples: Constitution of a data basis in binding energies for Fe and S reference compounds and applications to the evidence of surface species of an oxidized pyrite in a cabonate medium. Appl. Surf. Sci. 165, 288 (2000).


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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)...


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