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Phase formation and change of magnetic properties in mechanical alloyed Ni0.5Co0.5Fe2O4 by annealing

Azizi, A ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jmmm.2009.08.026
  3. Abstract:
  4. The effects of milling time and annealing temperature on phase formation, microstructure and magnetic properties of nickel-cobalt ferrite synthesized from oxide precursors by mechanical alloying were studied. The study of milling time effects on phase formation of milled materials showed that if milling continues up to 55 h, single phase nano-sized nickel-cobalt ferrite is obtained. Also, magnetic properties of powders versus milling time and annealing at different temperatures extensively changed, so that annealing at 1200 °C increased the magnetization saturation of the as-milled powder from 15.1 to 53.6 emu/g. X-ray powder diffraction technique (XRD) with Cu-Ka radiation was employed for phase identification. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were also used to determine the morphology and size of the particles. The magnetic properties were measured by a vibration sample magnetometer (VSM)
  5. Keywords:
  6. Nickel-cobalt ferrite ; Annealing temperatures ; As-milled powders ; Cobalt ferrites ; Coercivity ; Magnetic saturation ; Magnetization-saturation ; Milled materials ; Milling time ; Milling time effects ; Morphology and size ; Nano-powder ; Nano-sized nickel ; Oxide precursors ; Phase formations ; Phase identification ; SEM ; Single phase ; TEM ; Vibration sample magnetometers ; XRD ; Annealing ; Cobalt ; Coercive force ; Ferrite ; Ferrites ; Magnetic materials ; Magnetism ; Mechanical alloying ; Metallurgy ; Milling (machining) ; Nanostructured materials ; Nickel ; Nickel alloys ; Powders ; Saturation magnetization ; Scanning electron microscopy ; Transmission electron microscopy ; X ray powder diffraction ; Mechanical properties
  7. Source: Journal of Magnetism and Magnetic Materials ; Volume 322, Issue 1 , 2010 , Pages 56-59 ; 03048853 (ISSN)
  8. URL: http://www.sciencedirect.com/science/article/pii/S0304885309008610