Back Cover: A Sodium-Containing Quasicrystal: Using Gold To Enhance Sodium’s Covalency in Intermetallic Compounds (Angew. Chem. Int. Ed. 51/2012)



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A sodium-containing icosahedral quasicrystalline phase has been discovered. In their Communication page 12699 ff., G. J. Miller et al. describe the characterization of a Bergman-type i-Na13Au12Ga15 system. The existence and stability of this Na-containing icosahedral quasicrystal is tightly linked to its substantial Au content, which allows the electron-to-atom value to satisfy a Hume–Rothery stabilization rule, and creates novel Na–Au polar-covalent interactions.

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