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Effect of annealing on exchange bias in Mg0.2FexCr1.8−xO3 nano oxides

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Abstract

Magnesium-iron chromium oxides (Mg0.2Cr1.8−x Fe x O3 with x varying from 0.3 to 0.9) produced by hydrothermal process in a stirred pressure reactor from pure metal chlorides have been annealed at 700 °C. Single phase corundum structure and nanophase structure of the as-synthesized samples were confirmed by X-ray diffraction (XRD). Instead of the correlation between H EB and D XRD observed at T A = 600 °C, we find significant changes. The H EB increases with decreasing particle size reaches a maximum at ~43 nm (x = 0.5) then decreases.

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Acknowledgments

We acknowledge the financial support from the DST/NRF (South Africa) and University of KwaZulu-Natal (UKZN). We are also grateful to the Electron Microscopy Unit at UKZN (WC) for TEM measurements.

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  1. School of Physics, University of KwaZulu-Natal, Durban, 4000, South Africa

    Kalengay Mbela, T. Moyo & Nadir S.E. Osman

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  1. Kalengay Mbela
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  2. T. Moyo
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  3. Nadir S.E. Osman
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Correspondence to Kalengay Mbela.

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Mbela, K., Moyo, T. & Osman, N.S. Effect of annealing on exchange bias in Mg0.2FexCr1.8−xO3 nano oxides. J Mater Sci: Mater Electron 27, 8916–8922 (2016). https://doi.org/10.1007/s10854-016-4919-1

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  • DOI: https://doi.org/10.1007/s10854-016-4919-1

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