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

Fannin, P. C. and Marin, C. N. and Malaescu, I. and Stefu, N. and Vlăzan, 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...

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.

Item Type:Article
Subjects:Physical Science > Nanophysics
Material Science > Nanochemistry
Divisions:Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:10553
Deposited By:JNCASR
Deposited On:04 May 2011 06:45
Last Modified:04 May 2011 06:45

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