Fannin, P. C. and Marin, C. N. and Malaescu, I. and Stefu, N. and VlÄzan, P. and Novaconi, S. and Popescu, S. (2011) Effect of the concentration of precursors on the microwave absorbent properties of Zn/Fe oxide nanopowders. Journal of Nanoparticle Research, 13 (1). pp. 311-319.
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Official URL: http://www.springerlink.com/content/d8174vq323j655...
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.
|Subjects:||Physical Science > Nanophysics|
Material Science > Nanochemistry
|Divisions:||Faculty of Engineering, Science and Mathematics > School of Chemistry|
|Deposited On:||04 May 2011 06:45|
|Last Modified:||04 May 2011 06:45|
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