SAIP2013

A Mössbauer effect investigation of nanosized Mn_x(Mg, Co)_0.5-xZn_0.5Fe₂O₄

10 Jul 2013, 15:40

20m

Oral Presentation Track A - Division for Condensed Matter Physics and Materials DCMPM2

Speaker

Ms Wendy Bonakele Dlamini (School of Chemistry and Physics,University of KwaZulu-Natal, P/bag X54001, Durban 4000, South Africa)

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

Yes

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

PhD

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

No

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

Dr. J.Z. Msomi, Msonij1@ukzn.ac.za, University of KwaZulu-Natal

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

In this paper we report Mn substitution in Zn-Mg and Zn-Co spinel oxides. Single phase nanoferrite powders bearing the chemical formula MnxMg0.5-xZn0.5Fe2O4 and Mn_xCo_0.5-xZn_0.5Fe₂O₄(0≤x≤0.5 in steps of 0.1) have been produced by co-precipitation technique. The compounds were characterised by X-ray diffraction, Mössbauer and VSM measurements. The particle size varies between 9 nm and 15 nm. The variation of Mn concentration has significant effects on the structural and magnetic properties. ⁵⁷Fe Mössbauer effect spectra show ordered magnetic spin state in all the Mn_xCo_0.5-xZn_0.5Fe₂O₄ compounds. Transformation from ordered to disordered magnetic state has been obsereved with increasing x in Mn_xMg_0.5-xZn_0.5Fe₂O₄. The variation of the magnetic parameters such as coercive fields and saturation magnetization as a function of Mn concentration is also presented.