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Magnetic, electric, and dielectric properties of FeCo alloy nanoparticles dispersed in amorphous matrix

Thirumal, E and Prabhu, D and Chattopadhyay, K and Ravichandran, V (2010) Magnetic, electric, and dielectric properties of FeCo alloy nanoparticles dispersed in amorphous matrix. In: Physica Status Solidi A, 207 (11). pp. 2505-2510.

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Nanocrystalline Fe53Co47 alloy was synthesized by a single-step transmetallation chemical method at room temperature. The Fe53Co47 alloy nanoparticles of 77 and 47 wt% were dispersed in silica matrix by the sol-gel process using tetraethyl orthosilcate. Structural studies reveal that the as-prepared alloy powders are in bcc phase and silica is in an amorphous state. The phase-transition temperature and Mossbauer spectra analysis of the Fe-Co alloy establishes the homogeneous alloy formation. A saturation magnetization of 218 emu/g was obtained for pure FeCo alloy at room temperature. Scanning electron microscopic analysis demonstrates the hollow-sphere morphology for FeCo alloy particles. Magnetic nanocomposite consisting of 47 wt% FeCo-silica shows enhanced thermal stability over the native FeCo alloy. Electrical and dielectric properties of 47 wt% FeCo-silica nanocomposites were investigated as a function of frequency and temperature. It was found that the dielectric constants and dielectric loss were stable throughout the measured temperature (310-373 K). Our results indicate that FeCo-silica nanocomposite is a promising candidate for high-frequency applications. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Item Type: Journal Article
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Additional Information: Copyright of this article belongs to John Wiley and Sons.
Keywords: alloys; chemical synthesis; cobalt; dielectric properties; iron; nanocomposites; phase transitions
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 13 Dec 2010 10:32
Last Modified: 13 Dec 2010 10:32
URI: http://eprints.iisc.ernet.in/id/eprint/34445

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