| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1801693 | Journal of Magnetism and Magnetic Materials | 2011 | 7 Pages |
Nanoparticle-sized Co0.2Ni0.3Zn0.5Fe2O4 was prepared using mechanical alloying and sintering. The starting raw materials were milled in air and subsequently sintered at various temperatures from 600 to 1300 °C. The effects of sintering temperature on physical, magnetic and electrical characteristics were studied. The complex permittivity and permeability were investigated in the frequency range 10 MHz to 1.0 GHz. The results show that single phase Co0.2Ni0.3Zn0.5Fe2O4 could not be formed during milling alone and therefore requires sintering. The crystallization of the ferrite sample increases with increasing sintering temperature; which decrease the porosity and increase the density, crystallite size and the shrinkage of the material. The maximum magnetization value of 83.1 emu/g was obtained for a sample sintered at 1200 °C, while both the retentivity and the coercivity decrease with increasing the sintering temperature. The permeability values vary with both the sintering temperature and the frequency and the absolute value of the permeability decreased after the natural resonance frequency. The real part of the permittivity was constant within the measured frequency, while the loss tangent values decreased gradually with increasing frequency.
Research highlights► We have prepared Co0.2Ni0.3Zn0.5Fe2O4 using MA and studied its characteristics. ► The formation of a single phased crystalline ferrite via MA requires sintering. ► The sintering temperature plays vital roles in controlling the properties of ferrite. ► There existence of a sintering temperature for optimum properties.
