9-13 July 2012
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=11&confId=14"><font color=#ff0000>SAIP2012 PROCEEDINGS AVAILABLE</font></a>

Electrical Properties of Mn<sub>0.5</sub>Co<sub>0.5</sub>Fe<sub>2</sub>O<sub>4</sub> Nanosized Synthesized Via High-Energy Milling technique

12 Jul 2012, 17:30
2h
IT Building

IT Building

Poster Presentation Track A - Division for Condensed Matter Physics and Materials Poster Session

Speaker

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

Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?

Yes

Apply to be<br> consider for a student <br> &nbsp; award (Yes / No)?

Yes

Level for award<br>&nbsp;(Hons, MSc, <br> &nbsp; PhD)?

PhD

Main supervisor (name and email)<br>and his / her institution

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

Abstract content <br> &nbsp; (Max 300 words)

Mn0.5Co0.5Fe2O4 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 °C under argon atmosphere were studied using the four-probe method from room temperature to about 110 °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.

Primary author

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

Co-author

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

Presentation Materials

Peer reviewing

Paper