Effect of hydrogen reduction on microstructure and magnetic properties of mechanochemically synthesized Fe-16.5Ni-16.5Co nano-powder |
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Authors: | A. Azizi H. Yoozbashizadeh |
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Affiliation: | a Department of Materials Science and Engineering, Sharif University of Technology, P.O. Box 11365-9466, Tehran, Iran b Materials and Energy Research Center |
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Abstract: | 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 Ni0.5Co0.5Fe2O4 compositional change into Fe-16.5Ni-16.5Co nano-powder. |
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Keywords: | Fe-16.5Ni-16.5Co Nano-powder Mechanical alloying Hydrogen reduction Soft magnetic property Hard magnetic property Nickel-cobalt ferrite |
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