Effect of Sintering Temperature on Structural and Magnetic Properties of Ni<sub>0.55</sub>Zn<sub>0.45</sub>Fe<sub>2</sub>O<sub>4</sub> Ferrites
- 1 The Department of Physics, Jahangirnagar University, Dhaka, Bangladesh
- 2 The Department of Physics, Jahangirnagar University, Dhaka, Bangladesh
- 3 Materials Science Division, Atomic Energy Centre, Dhaka, Bangladesh
- 4 Materials Science Division, Atomic Energy Centre, Dhaka, Bangladesh
- 5 The Department of Physics, Jahangirnagar University, Dhaka, Bangladesh
- 6 Department of Physics, Khulna University of Engineering & Technology, Khulna, Bangladesh
- 7 Materials Science Division, Atomic Energy Centre, Dhaka, Bangladesh
Abstract
The effect of frequency and sintering temperature on initial permeability of Ni 0.55 Zn 0.45 Fe 2 O 4 ferrites have been studied by using an impedance analyzer. The samples were prepared by conventional double sintering ceramic technique using oxide nanoparticles of grain size 30 - 50 nm. Single phase spinal structure has been confirmed for the prepared samples by X-ray diffraction. As the sintering temperatures increase from 1160℃ to 1300℃, the permeability gradually increases. The increase of permeability is ascribed to the increase of density and grain size. Grain size is expected to grow with the increase of sintering temperature. Ferrites with large average grain size posses higher initial permeability. The Curie temperatures determined from temperature dependence of permeability of the samples sintered at different temperatures are found to be T c = (321 ± 1)℃ and independent of sintering temperature. At T s = 1300℃, Tc is found to increase substantially which can be explained by the fact that Zn has evaporated from the surface layer.
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