9-13 July 2012
Africa/Johannesburg timezone
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Electrical Properties of Mn0.5Co0.5Fe2O4 Nanosized Synthesized Via High-Energy Milling technique

Presented by Mr. HAFIZ M. I. ABDALLAH on 12 Jul 2012 from 17:30 to 19:30
Type: Poster Presentation
Session: Poster Session
Track: Track A - Division for Condensed Matter Physics and Materials

Abstract

Mn<sub>0.5</sub>Co<sub>0.5</sub>Fe<sub>2</sub>O<sub>4</sub> sample was produced from high-purity metal oxides by high-energy ball milling method. Single-phase cubic spinel structure of the synthesized sample was confirmed by X-ray diffraction (XRD). The results show that the as-prepared sample had an average grain size of about 8 nm. Bulk samples in the form of pellets were also produced from the as-prepared sample for resistivity measurements. The temperature dependence of the electrical resistivity for samples sintered from 600 - 1100 &deg;C under argon atmosphere were studied using the four-probe method from room temperature to about 110 &deg;C. Two possible mechanisms for resistivity involving T -1 and T -1/2 dependences were investigated which we associated with semiconducting and inter-grain conductivity respectively. The T -1/2 dependence is found to fit the data better and predicts higher activation energies. The resistivity was observed to be sensitive to the surface of the pellet being probed and the annealing temperature.

Award

Yes

Level

PhD

Supervisor

Thomas Moyo, Moyo@ukzn.ac.za, School of Chemistry and Physics, Westville campus, University of KwaZulu-Natal

Paper

Yes

Place

Location: IT Building
Room:


Primary authors

  • Mr. HAFIZ M. I. ABDALLAH School of Chemistry and Physics, Westville Campus, University of KwaZulu-Natal, Private Bag X54001, Durban 4000, South Africa
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Co-authors

  • Dr. THOMAS MOYO School of Chemistry and Physics, Westville Campus, University of KwaZulu-Natal, Private Bag X54001, Durban 4000, South Africa
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