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No.2(pp.53-100)

Home > Issues > Volume 14 (2009) > No.2(pp.53-100)

Synthesis of Metal and Ceramic Magnetic Nanoparticles by Levitational Gas Condensation (LGC)

Journal of Magnetics, Volume 14, Number 2, 30 Jun 2009, Pages 75-79

Y. R. Uhm*

(Nuclear Materials Research Division, Korea Atomic Energy Research Institute), H. M. Lee(Nuclear Materials Research Division, Korea Atomic Energy Research Institute), G. J. Lee(Nuclear Materials Research Division, Korea Atomic Energy Research Institute), C. K. Rhee(Nuclear Materials Research Division, Korea Atomic Energy Research Institute)

Abstract

Nickel (Ni) and ferrite (Fe₃O₄,NiFe₂O₄) nanoparticles were synthesized by LGC using both wire feeding (WF) and micron powder feeding (MPF) systems. Phase evolution and magnetic properties were then investigated. The Ni nanopowder included magnetic-ordered phases. The LGC synthesis yielded spherical particles with large coercivity while the abnormal initial magnetization curve for Ni indicated a non-collinear magnetic structure between the core and surface layer of the particles. Since the XRD pattern cannot actually distinguish between magnetite (Fe₃O₄) and maghemite (γ-Fe₂O₃) as they have a spinel type structure, the phase of the iron oxide in the samples was unveiled by Mössbauer spectroscopy. The synthesized Ni-ferrite consisted of single domain particles, including an unusual ionic state. The synthesized nanopowder bore an active surface due to the defects that affected abnormal magnetic properties.

Keywords: nanopowder; levitational gas condensation (LGC)

DOI: 10.4283/JMAG.2009.14.2.75

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