This paper was published as Journal of Physics: Condensed Matter, 2004, 16 (43), pp. 7813-7821. It is available from http://www.iop.org/EJ/abstract/0953-8984/16/43/020/. Doi: 10.1088/0953-8984/16/43/020Metadata only entryThe 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
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