Synthesis, transformation and superconductivity of dual phase In-Sn alloy nanoparticles embedded in an Al matrix

Bhattacharya, V and Chattopadhyay, K and Ayyub, P (2005) Synthesis, transformation and superconductivity of dual phase In-Sn alloy nanoparticles embedded in an Al matrix. In: Philosophical Magazine Letters, 85 (11). pp. 577-585.

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Abstract

We report the synthesis of nanoembedded biphasic alloy particles of In - Sn near eutectic alloy compositions embedded in an aluminium matrix by rapid solidification processing. Detailed transmission electron microscopy indicates that the two phases present at room temperature in as-synthesized samples are beta and gamma phases with tetragonal and hexagonal crystal structures, respectively. These co-exist with a small amount of single phase In or Sn particles with sizes less than 10 nm. Low temperature magnetization measurements indicate a superconducting transition temperature of 5 K, suggesting complete decomposition of the beta-phase at small sizes and at low temperature. The small particles show type II behavior with a critical field $Hc_{1}$ approximate to 44 G and two values for $Hc_{2}$ of 250 and 1000 G, respectively. These values are considerably lower than those observed in bulk In - Sn alloys.

Item Type:	Journal Article
Publication:	Philosophical Magazine Letters
Publisher:	Taylor & Francis Ltd
Additional Information:	Copyright for this article belongs to Taylor & Francis Ltd.
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	24 Jan 2006
Last Modified:	19 Sep 2010 04:23
URI:	http://eprints.iisc.ac.in/id/eprint/5211

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