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Magnetic and dielectric properties of polycrystalline Co0.5Ni0.5Fe2O4 materials prepared using mechanically alloyed nanoparticles.


Citation

Waje, Samaila Bawa and Hashim, Mansor and W. Yusoff, W.Mohd Daud and Abbas, Zulkifly (2011) Magnetic and dielectric properties of polycrystalline Co0.5Ni0.5Fe2O4 materials prepared using mechanically alloyed nanoparticles. International Journal of Modern Physics B, 25 (9). pp. 1225-1233. ISSN 0217-9792; ESSN:1793-6578

Abstract

Cobalt–nickel ferrite (Co0.5Ni0.5Fe2 O4) were prepared using a high energy milling and sintering. The starting raw materials of NiO, Co3O4 and Fe2O3 were subjected to 12 hr milling using a Spex8000D mixer/mill. The resulting material was molded into samples of toroidal/disc shape and subsequently sintered at various temperatures from 600 to 1000° C, at 100° C interval. The effect of sintering temperature on microstructure, saturation magnetization (Ms), and coercivity (Hc) was reported. The frequency dependence of the magnetic and dielectric properties such as permittivity, loss tangent, permeability and loss factor were investigated in the frequency range of 10 MHz–1.8 GHz. The results show that the real part of the permittivity at individual temperatures was constant within the measured frequency, while the loss tangent values decreased gradually with increasing frequency. The real permeability on the other hand remained fairly constant over certain frequency (around 1.0 GHz), and thereafter increases towards saturation thereby showing a good potential in the microwave frequencies region.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
DOI Number: https://doi.org/10.1142/S0217979211058626
Publisher: World Scientific Publishing
Keywords: Mechanical alloying; Dielectric proeprites; Magnetic properties; Sintering temperatures.
Depositing User: Nur Farahin Ramli
Date Deposited: 22 Jul 2013 09:03
Last Modified: 09 Oct 2015 08:19
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1142/S0217979211058626
URI: http://psasir.upm.edu.my/id/eprint/25108
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