title: Production and determination of the magnetic properties of the Fe-36Ni nanopowder via electrical explosion of wire in water and compacted alloy.
abstract: Fe-36Ni alloy nanopowder was prepared via electrical explosion of wire in DI water. The nanopowder was reduced in hydrogen at 500 degrees C for 30 min. Spark plasma sintering at 800 and 1000 degrees C for 10 min was used to obtain bulk samples from the hydrogen-reduced nanopowder. The sintered samples were annealed at 500 degrees C for 2 h. X-ray diffraction was used to analyze the phases of the nanopowder and sintered samples. The results showed that the sintered samples were formed in gamma-(Fe-Ni) solid solution. The particles sizes and morphologies of the as-synthesized and hydrogen-reduced nanoparticles were observed via transmission electron microscopy. The morphologies of the as-synthesized nanoparticles had spherical core-shell structures. Core was gamma-(Fe-Ni) and the shell was FeO. The nanoparticles of the as-synthesized and hydrogen reduced samples were found to be nearly spherical in shape, with average diameters of 32 and 70 nm, respectively. The hysteresis loops of the as-synthesized nanopowder, hydrogen reduced nanopowder, and sintered samples revealed ferromagnetic characteristics.
authors: School of Materials Science Engineering, University of Ulsan, San-29, Mugeo-2 Dong, Nam-Ku, Ulsan, 680-749, South Korea.
authors: L H
authors: LH
authors: Bac
authors: H J
authors: HJ
authors: Ryu
authors: B K
authors: BK
authors: Kim
authors: J S
authors: JS
authors: Kim
authors: J C
authors: JC
authors: Kim