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A Sodium-Containing Quasicrystal: Using Gold To Enhance Sodium’s Covalency in Intermetallic Compounds

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  • We are indebted to J. Jacobs for ICP-MS analyses and K. Dennis for DSC measurements. The research was supported by the Office of the Basic Energy Sciences, Materials Sciences Division, U. S. Department of Energy (DOE). Ames Laboratory is operated for DOE by Iowa State University under contract No. DE-AC02-07CH11358. Use of the Advanced Photon Source was supported by the US DOE under Contract No. DE-AC02-06CH11357.

Abstract

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Gold macht stabil: Na13Au12Ga15, ein natriumhaltiges thermodynamisch stabiles quasikristallines Material, wurde bei einer systematischen Studie des polaren Na-Au-Ga-Intermetallsystems entdeckt. Sein Elektron/Atom-Verhältnis von 1.75 ist für Bergman-Ikosaederphasen extrem klein, doch der substanzielle Au-Anteil sorgt für eine Hume-Rothery-Stabilisierung und neuartige polar-kovalente Na-Au-Wechselwirkungen.

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