Synthesis, magnetic and electrical properties of Fe-containing SiO2 nanocomposite

Thirumal, E and Prabhu, D and Chattopadhyay, K and Ravichandran, V (2010) Synthesis, magnetic and electrical properties of Fe-containing SiO2 nanocomposite. In: Journal of Alloys and Compounds, 502 (1). pp. 169-175.

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Abstract

Nanocrystalline Fe powders were synthesized by transmetallation reaction and embedded in silica to form Fe-SiO2 nanocomposite. Thermomagnetic study of the as-prepared Fe sample indicates the presence of Fe3O4 and Fe particles. Oxidation studies of Fe and Fe-SiO2 show an increased thermal stability of Fe-SiO2 nanocomposite over pure Fe. The Fe-SiO2 shows an enhanced oxidation temperature (i.e., 780 K) and a maximum saturation magnetization value of (135 emu/g) with 64 wt.% of Fe content in silica. Electrical and dielectric behaviour of the Fe-SiO2 nanocomposite has been investigated as a function of temperature and frequency. Low frequency ac conductivity and dielectric constants were found to be influenced by desorptions of chemisorbed moisture. High saturation magnetization, thermal stability, frequency-dependent conductivity and low power loss make Fe-silica a promising material for high frequency applications. (C) 2010 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	Journal of Alloys and Compounds
Publisher:	Elsevier science
Additional Information:	Copyright of this article belongs to Elsevier science.
Keywords:	Composite materials;Chemical synthesis;Dielectric response; Oxidation;Thermal analysis;Electrochemical impedance spectroscopy
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	11 Aug 2010 07:55
Last Modified:	19 Sep 2010 06:13
URI:	http://eprints.iisc.ac.in/id/eprint/31213

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