Showing papers by "University of Wah published in 2010"
TL;DR: In this article, the chemical phase analysis carried out by X-ray powder diffraction method confirms the major phase of Cu-Zn ferrite structure and porosity has been investigated to study the effect of composition.
Abstract: Mixed Cu-Zn ferrites (for x = 066 to 099) are prepared by the double sintering ceramic method Locally available low cost Fe2O3 with 05wt% of Si additive is used for this purpose which reduced the process price markedly and improves the properties of the ferrite produced The chemical phase analysis carried out by X-ray powder diffraction method confirms the major phase of Cu-Zn ferrite structure Lattice parameters, X-ray density and mass density along with porosity have been investigated to study the effect of composition Lattice parameters shows a decreasing trend with increasing Cu content, x whereas, both X-ray density and mass density increases with increasing x, which in turn decreases the porosity due to successive presence of Si in Fe2O3 This decrease in porosity along with chemical homogeneities, distribution of phases and grain formation were also observed from Scanning electron micrographs at different magnifications
2 citations
TL;DR: In this article, the dielectric properties were studied as a function of composition, frequency and temperature for a series of Mn x Zn 1- x Fe 2 O 4 ferrite.
Abstract: In this paper, some of the results of dielectric study carried out using locally produced low cost Fe 2 O 3 powder with 0.5 wt% of Si additive are being summarized. The dielectric properties were studied as a function of composition, frequency and temperature for a series of Mn x Zn 1- x Fe 2 O 4 ferrite. The samples were prepared by the usual ceramic technique. It was observed that the values obtained for dielectric constant ∈ ′ and dielectric loss factor tan δ are much lower than those normally obtained for Mn-Zn ferrite prepared by pure Fe 2 O 3 powder. The low values are attributed to the presence of Si, which suppress the ceramic grain growth. The low dielectric loss makes these samples attractive for use at high frequencies. Each of ∈ ′ and tan δ increases on increasing the temperature. Abnormal dielectric behavior observed for x = 0.99 due to forced migration of Fe ions from A sites to B sites at this composition.