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Effect of the concentration of precursors on the microwave absorbent properties of Zn/Fe oxide nanopowders

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Abstract

Zn/Fe oxide compound powders were obtained by the hydrothermal method using ferric nitrate Fe(NO3)3·9H2O and zinc nitrate Zn(NO3)2·6H2O at 200 °C and different precursor molar ratios x = Fe3+/Zn2+ equal to 2.8/0.2, 2.5/0.5, 1.8/1.2 and 1.5/1.5. The samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy/energy dispersive X-ray analysis (SEM–EDAX). Room temperature measurements of the frequency dependence of the complex magnetic permeability and complex dielectric permittivity, over the frequency range from 0.1 to 6 GHz, were performed. For precursor molar ratios x = 2.8/0.2, x = 1.8/1.2 and x = 1.5/1.5 the obtained samples showed a ferromagnetic-like resonance behaviour. This behaviour was assigned to the prevalent compounds in the obtained samples, Fe2O3 (for x = 2.8/0.2) and ZnFe2O4 (for x = 1.8/1.2 and x = 1.5/1.5). Based on the magnetic and dielectric measurements, the microwave absorbent properties of the four samples were analysed, and the sample containing mostly of ZnFe2O4 (for x = 1.8/1.2) was found to be the best electromagnetic absorber in the frequency range 1.36–6 GHz.

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Acknowledgements

P. C. Fannin acknowledges ESA for part funding of this study, whilst the other authors gratefully acknowledge partial financial support from CNMP grant no. 1-32155/2008. Acknowledgements are also due to A. Bucur for the support in performing the XRD measurements.

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Authors and Affiliations

  1. Department of Electronic and Electrical Engineering, Trinity College, Dublin 2, Ireland

    P. C. Fannin

  2. Faculty of Physics, Department of Electricity and Magnetism, West University of Timisoara, Bd. V. Pârvan #4, Timisoara, Romania

    C. N. Marin, I. Malaescu & N. Stefu

  3. Condensed Matter Department, National Institute for Research and Development in Electrochemistry and Condensed Matter, Timisoara, Plautius Andronescu 1, Timisoara, Romania

    P. Vlăzan, S. Novaconi & S. Popescu

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  1. P. C. Fannin
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  2. C. N. Marin
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  3. I. Malaescu
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  4. N. Stefu
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  5. P. Vlăzan
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  6. S. Novaconi
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Correspondence to C. N. Marin.

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Fannin, P.C., Marin, C.N., Malaescu, I. et al. Effect of the concentration of precursors on the microwave absorbent properties of Zn/Fe oxide nanopowders. J Nanopart Res 13, 311–319 (2011). https://doi.org/10.1007/s11051-010-0032-1

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  • DOI: https://doi.org/10.1007/s11051-010-0032-1

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