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- W2062570543 abstract "The structures of two samples of gold nanoclusters supported on silica were studied by X-ray powder diffraction (XRD) and X-ray absorption spectroscopy. The data relative to both techniques were analysed by an approach involving simulation based on structural models and fitting. The XRD model concerned a distorted f.c.c. (face-centred cubic) arrangement, with microstrains and parallel stacking faults in approximately spherical particles; as an alternative possibility, a linear combination of ordered f.c.c. and noncrystalline (decahedral and icosahedral) particles was also taken into account. Both approaches gave calculated patterns closely resembling the experimental data. X-ray absorption spectra were fitted on the basis of f.c.c. and noncrystalline arrangements. The best results were obtained by the f.c.c. motif, while a simulation consisting in the superposition of f.c.c. and noncrystalline components in the relative amounts determined by XRD analysis gave a poor agreement with the experimental data. It was concluded that the good XRD fitting obtained by linear combination of lognormal size-distributed f.c.c. cuboctahedral, decahedral and icosahedral contributions was a result of the flexibility of the basis set of functions, but that the complementary analysis of X-ray absorption data did not confirm the presence of a noteworthy fraction of noncrystalline particles." @default.
- W2062570543 created "2016-06-24" @default.
- W2062570543 creator A5026145338 @default.
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- W2062570543 date "2008-03-08" @default.
- W2062570543 modified "2023-10-16" @default.
- W2062570543 title "Distorted f.c.c. arrangement of gold nanoclusters: a model of spherical particles with microstrains and stacking faults" @default.
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- W2062570543 doi "https://doi.org/10.1107/s0021889808004846" @default.
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