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Effect of hydrogen reduction on microstructure and magnetic properties of mechanochemically synthesized Fe-16.5Ni-16.5Co nano-powder

Azizi, A ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jmmm.2009.03.085
  3. Publisher: 2009
  4. Abstract:
  5. Most recent findings on structural and magnetic properties of Fe-Ni-Co nano-powders produced by mechanical alloying and subsequent low-temperature hydrogen reduction are presented in this paper. At 300 rpm, with ball to powder weight ratio of 20, single phase nickel-cobalt ferrite is mechanically synthesized for 50 h. The as-milled powder is then subjected to 1 h hydrogen reduction at 700 °C. Hydrogen reduction results in the formation of Fe-16.5%Ni-16.5%Co nano-powders. The phases of the powders are identified by X-ray diffraction (XRD) utilizing Cu Kα radiation. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) are used to study the morphology and the average size of the nano-powder particles. Chemical analysis of the phases present in the reduced sample is determined by electron dispersive spectrometry (EDS). The magnetic properties of the powders are measured by a vibration sample magnetometer (VSM). Results indicate a noticeable change in the magnetic properties of the samples due to Ni 0.5Co 0.5Fe 2O 4 compositional change into Fe-16.5Ni-16.5Co nano-powder. © 2009
  6. Keywords:
  7. Fe-16.5Ni-16.5Co Nano-powder ; Hard magnetic property ; Hydrogen reduction ; Nickel-cobalt ferrite ; As-milled powders ; Average size ; Ball-to-powder weight ratio ; Cobalt ferrites ; Compositional changes ; Effect of hydrogen ; Low temperatures ; Nano powders ; SEM ; Single phase ; Soft magnetic property ; Structural and magnetic properties ; TEM ; Vibration sample magnetometers ; Cobalt ; Ferrite ; Ferrites ; Hydrogen ; Magnetic materials ; Magnetic properties ; Magnetism ; Metallurgy ; Nanostructured materials ; Nickel ; Nickel alloys ; Scanning electron microscopy ; Transmission electron microscopy ; X ray diffraction ; X ray powder diffraction ; Powders ; Mechanical alloying
  8. Source: Journal of Magnetism and Magnetic Materials ; Volume 321, Issue 18 , 2009 , Pages 2729-2732 ; 03048853 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0304885309003783