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Atomic short-range order in an AlNiFe decagonal quasicrystal studied by anomalous x-ray scattering

Journal of Physics Condensed Matter, ISSN: 0953-8984, Vol: 19, Issue: 46
2007
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Diffuse scattering around Bragg reflections was observed by anomalous x-ray scattering in a single decagonal quasicrystal of AlNi Fe. Intensity modulations of the diffuse scattering were measured for four incident x-ray beam energies. Quantitative analysis of the diffuse scattering data shows the presence of atomic short-range order (SRO) in three kinds of pair-correlation functions: Al-Ni, Ni-Fe and Fe-Al. The SRO diffuse scattering is decomposed into each component by self-consistent calculation. Using Metropolis Monte Carlo simulations, the SRO diffuse scattering is calculated qualitatively using the SRO parameters. Asymmetric distributions of the diffuse scattering were seen along a longitudinal direction, even though the AlNiFe quasicrystal has quite small mosaicity. © IOP Publishing Ltd.

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