Atomic structure of embedded Fe nanoclusters as a function of host matrix material: a synchrotron radiation study

Autor:	S.H. Baker, S J Gurman, A. Bleloch, Colin W. Binns, S. Louch, Mervyn Roy
Rok vydání:	2004
Předmět:	Matrix (chemical analysis) Crystallography Materials science Nanocomposite Extended X-ray absorption fine structure Amorphous carbon K-edge Analytical chemistry Cluster (physics) Synchrotron radiation General Materials Science Condensed Matter Physics Nanoclusters
Zdroj:	Journal of Physics: Condensed Matter. 16:7813-7821
ISSN:	1361-648X 0953-8984
DOI:	10.1088/0953-8984/16/43/020
Popis:	The atomic structure of Fe nanoclusters embedded in a range of matrix materials has been studied using synchrotron radiation. In particular, the effect of embedding the clusters in Ag, amorphous carbon (a-C) and a porous C60 matrix is investigated. The embedded cluster samples were prepared by co-deposition using a gas aggregation cluster source. Samples with both dilute and high-volume-filling fraction of clusters, at 4 and 40% respectively, were prepared. Fe K edge EXAFS measurements were used to probe the structure within the clusters. In a Ag matrix, the Fe clusters retain the b.c.c. structure of bulk Fe while in a-C there is evidence for both b.c.c. and f.c.c. structures in the clusters. These results are independent of cluster volume-filling fraction over the range investigated. When embedded in a porous C60 matrix, the Fe clusters oxidize to Fe2O3.
Databáze:	OpenAIRE
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