Journal of Nanoparticle Research

, Volume 13, Issue 1, pp 311–319

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

Authors

  • P. C. Fannin
    • Department of Electronic and Electrical EngineeringTrinity College
    • Faculty of Physics, Department of Electricity and MagnetismWest University of Timisoara
  • I. Malaescu
    • Faculty of Physics, Department of Electricity and MagnetismWest University of Timisoara
  • N. Stefu
    • Faculty of Physics, Department of Electricity and MagnetismWest University of Timisoara
  • P. Vlăzan
    • Condensed Matter DepartmentNational Institute for Research and Development in Electrochemistry and Condensed Matter, Timisoara
  • S. Novaconi
    • Condensed Matter DepartmentNational Institute for Research and Development in Electrochemistry and Condensed Matter, Timisoara
  • S. Popescu
    • Condensed Matter DepartmentNational Institute for Research and Development in Electrochemistry and Condensed Matter, Timisoara
Research Paper

DOI: 10.1007/s11051-010-0032-1

Cite this article as:
Fannin, P.C., Marin, C.N., Malaescu, I. et al. J Nanopart Res (2011) 13: 311. doi:10.1007/s11051-010-0032-1

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.

Keywords

Microwave absorberZn/Fe oxideHydrothermal methodComplex magnetic permeabilityComplex dielectric permittivityNanoparticles

Copyright information

© Springer Science+Business Media B.V. 2010