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Nanometer scale intermixing mechanism in Ag-based nanocomposites

Published online by Cambridge University Press:  17 March 2011

Adrian D. Jianu ,
Victor E. Kuncser ,
Radu C. Nicula ,
Petre Palade ,
Manuela E. Stir ,
Mihaela C. Bunescu  and
Eberhard Burkel
Adrian D. Jianu
Affiliation:
Universitét Rostock, FB Physik, August-Bebel-Str. 55, D-18055 Rostock, Germany National Institute for Materials Physics, P.O.Box MG-7, 76900, Bucharest-Magurele, Romania
Victor E. Kuncser
Affiliation:
Universitét Rostock, FB Physik, August-Bebel-Str. 55, D-18055 Rostock, Germany National Institute for Materials Physics, P.O.Box MG-7, 76900, Bucharest-Magurele, Romania
Radu C. Nicula
Affiliation:
Universitét Rostock, FB Physik, August-Bebel-Str. 55, D-18055 Rostock, Germany
Petre Palade
Affiliation:
National Institute for Materials Physics, P.O.Box MG-7, 76900, Bucharest-Magurele, Romania
Manuela E. Stir
Affiliation:
Universitét Rostock, FB Physik, August-Bebel-Str. 55, D-18055 Rostock, Germany
Mihaela C. Bunescu
Affiliation:
National Institute for Materials Physics, P.O.Box MG-7, 76900, Bucharest-Magurele, Romania
Eberhard Burkel
Affiliation:
Universitét Rostock, FB Physik, August-Bebel-Str. 55, D-18055 Rostock, Germany
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Abstract

A new Ag-Sm-Fe nanocomposite material was obtained by high-energy ball-milling of elemental μ-Fe powder and melt-spun Ag-Sm flakes. Magnetic Fe nanocrystals were thus embedded in a paramagnetic Ag-based matrix. Synchrotron radiation powder diffraction and temperature dependent Mössbauer spectroscopy were used to study the nanometer scale Fe/Ag(Sm) intermixing mechanism. The evolution of the average grain size and microstrains in the Ag-based matrix vs. the milling time were obtained from the analysis of the X-ray diffraction linewidths. For reference Fe powder samples, a bimodal grain size distribution was evidenced by Mössbauer spectroscopy. The magnetic behaviour of the Fe nanocrystals was analysed with respect to the superparamagnetic relaxation effect and collective excitations. The nanometer scale intermixing of Fe nanocrystals in the Ag-based matrix is completed when the Fe and matrix grains have comparable dimensions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 644: Symposium L – Supercooled Liquid, Bulk Glassy and Nanocrystalline State of Alloys , 2000 , L12.2
Copyright
Copyright © Materials Research Society 2001

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