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Magnetic Properties of nCoO/(1-n)ZnO Nanocomposites Obtained by Calcination

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Nanostructured Materials for the Detection of CBRN

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Abstract

Magnetic properties of the nCoO/(1-n)ZnO (n = 0.4, 0.50, 0.60 and 0.70) nanocomposites obtained by using traditional wet chemical synthesis method followed by calcination at 600∘C were investigated by dc magnetometry and magnetic resonance spectroscopy. XRD measurements revealed the presence of only two phases: ZnO (hexagonal nanocrystals with sizes in 64–300 nm range) and spinel phase Co3O4 (spheroidal nanocrystals with sizes in 14–21 nm range). Magnetic dc susceptibility measurements in 2–300 K range revealed dominating paramagnetic behavior in the whole temperature range and the presence of a strong temperature-independent component. With exception of n = 0.70 sample, no behavior connected with the expected phase transition to antiferromagnetic phase in Co3O4 and superparamagnetism was registered. Experimental results could be consistently explained by assuming that the most of high-spin Co2+ ions are involved in formation of antiferromagnetic pairs or clusters. Low intensity electron paramagnetic resonance spectra registered at RT were attributed to two different magnetic components – one involving paramagnetic Co2+ ions at Zn2+ sites in ZnO and the other due to Co2+ in Co3O4 phase or more probably the superparamagnetic resonance of Co3O4 nanoparticles. The former component dominates in nanocomposites with small concentration of cobalt, the latter in highly Co concentrated samples.

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Authors and Affiliations

  1. Institute of Physics, Faculty of Mechanical Engineering and Mechatronics, West Pomeranian University of Technology, Szczecin, Poland

    N. Guskos, G. Zolnierkiewicz & J. Typek

  2. Department of Solid State Physics, Faculty of Physics, University of Athens, Athens, Greece

    S. Glenis

  3. Department of Chemical and Environment Engineering, West Pomeranian University of Technology, Szczecin, Poland

    D. Sibera & U. Narkiewicz

Authors
  1. N. Guskos
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  2. G. Zolnierkiewicz
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  3. J. Typek
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  4. S. Glenis
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  5. D. Sibera
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  6. U. Narkiewicz
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Corresponding author

Correspondence to N. Guskos .

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Editors and Affiliations

  1. J. Stefan Institute, Ljubljana, Slovenia

    Janez Bonča

  2. Bogolyubov Institute for Theoretical Physics, NASU, Kiev, Ukraine

    Sergei Kruchinin

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Guskos, N., Zolnierkiewicz, G., Typek, J., Glenis, S., Sibera, D., Narkiewicz, U. (2018). Magnetic Properties of nCoO/(1-n)ZnO Nanocomposites Obtained by Calcination. In: Bonča, J., Kruchinin, S. (eds) Nanostructured Materials for the Detection of CBRN. NATO Science for Peace and Security Series A: Chemistry and Biology. Springer, Dordrecht. https://doi.org/10.1007/978-94-024-1304-5_5

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