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

  • P. C. Fannin
  • C. N. Marin
  • I. Malaescu
  • N. Stefu
  • P. Vlăzan
  • S. Novaconi
  • S. Popescu
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

Authors and Affiliations

  • P. C. Fannin
    • 1
  • C. N. Marin
    • 2
  • I. Malaescu
    • 2
  • N. Stefu
    • 2
  • P. Vlăzan
    • 3
  • S. Novaconi
    • 3
  • S. Popescu
    • 3
  1. 1.Department of Electronic and Electrical EngineeringTrinity CollegeDublin 2Ireland
  2. 2.Faculty of Physics, Department of Electricity and MagnetismWest University of TimisoaraTimisoaraRomania
  3. 3.Condensed Matter DepartmentNational Institute for Research and Development in Electrochemistry and Condensed Matter, TimisoaraTimisoaraRomania