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Phase formation and change of magnetic properties in mechanical alloyed Ni0.5Co0.5Fe2O4 by annealing |
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| Authors: | Amin Azizi H Yoozbashizadeh M Mohammadi |
| Institution: | a Materials Science and Engineering Department, Sharif University of Technology, Tehran, Iran b Materials and Energy Research Center, Tehran, Iran c Advanced Materials Research Institute, University of New Orleans, New Orleans, LA, USA |
| Abstract: | 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). |
| Keywords: | Nickel-cobalt ferrite Nano-powder Mechanical alloying Annealing Coercivity Magnetic saturation |
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