Abstract
Icosahedral quasicrystals (i-QCs) are long-range ordered solids that show non-crystallographic symmetries such as five-fold rotations. Their detailed atomic structures are still far from completely understood, because most stable i-QCs form as ternary alloys suffering from chemical disorder. Here, we present the first detailed structure solution of i-YbCd5.7, one of the very few stable binary i-QCs, by means of X-ray structure determination. Three building units with unique atomic decorations arrange quasiperiodically and fill the space. These also serve as building units in the periodic approximant crystals. The structure is not only chemically feasible, but also provides a seamless structural understanding of the i-YbCd5.7 phase and its series of related i-QCs and approximant crystals, revealing hierarchic features that are of considerable physical interest.
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Acknowledgements
We acknowledge the European Synchrotron Radiation Facility and the French Cooperative Research Group for the allocation of beam time on the D2AM beam line. We thank N. Boudet and J. F. Berar for their assistance on D2AM during the experiment. C.P.G. has been financially supported by the Japan Society for the Promotion of Science (JSPS).
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All authors discussed the results and commented on the manuscript. H.T. and C.P.G. contributed equally to the final form of the manuscript.
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Takakura, H., Gómez, C., Yamamoto, A. et al. Atomic structure of the binary icosahedral Yb–Cd quasicrystal. Nature Mater 6, 58–63 (2007). https://doi.org/10.1038/nmat1799
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DOI: https://doi.org/10.1038/nmat1799