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Compacted Binary Mixtures of Nanometer-Sized Crystals

Published online by Cambridge University Press:  28 February 2011

U. Herr
U. Herr*
Affiliation:
Institut fuer Neue Materialien, Universitaet des Saarlandes, Bau 43, W-6600 Saarbruecken, Germany
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Abstract

A preparation method for mixtures of chemically different kinds of crystals on a nanometer scale is described. The method is based on inert gas condensation followed by the consolidation by means of high pressure. Since the size of the crystals is in the range of 6–20 nm, an appreciable volume fraction of the material is made up by interphase boundaries between the different crystals. Investigations of the morphological homogeneity of compacted mixtures consisting of Fe crystals and Cu or Ag crystals respectively have been carried out by means of electron microscopy and small-angle X-ray scattering. The atomistic structure in the vicinity of the Fe atoms has been studied by Moessbauer spectroscopy; indications for the formation of alloy phases have been found even for the Ag-Fe system which exhibits no miscibility in the liquid state. Alloy formation is proposed to take place at the interphase boundaries due to the special thermodynamic conditions in the boundary regions. These conditions are attributed to the free volume of the boundaries as well as to the presence of stresses.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 206: Symposium G – Clusters and Cluster-Assembled Materials , 1990 , 533
Copyright
Copyright © Materials Research Society 1991

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References

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