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- W2322991952 abstract "Quantitative syntheses, structure determinations and interpretations, and band calculations are reported for the nonstoichiometric rhombohedral (R3̅c) and monoclinic (C2/c) Sr2Au6(Au3–xTx) (T = Zn, Ga) compounds. Several different compositions of the two Sr phases were similarly refined from single crystal X-ray diffraction data as R3̅c: a ≈ 8.43 Å, c ≈ 21.85 Å, Z = 6 and C2/c: a ≈ 14.70 Å, b ≈ 8.47 Å, c ≈ 8.70 Å, β ≈ 123.2°, Z = 4. The R3̅c Zn phase is stable in the composition region x ∼ 2.5–2.9 whereas its C2/c neighbor is the major product at x ∼ 2.2–2.3. Gallium versions of both were also identified. Both R3̅c and C2/c structural types contain hexagonal-diamond-like gold superlattices stuffed with strings of interstitial Sr and disordered triangular (Au,T)3 units. The latter space group is a maximal, nonisomorphic subgroup of the former, and the decrease in interstitial radius from Ba to Sr (∼0.08 Å experimentally) evidently drives the symmetry reduction, relaxation, and small distortions, principally around the Sr sites. Au–Au bonding among the Au hexagons in the host lattices and with gold components in the triangular interstitials is dominant and reflected in their tight packing and short interatomic separations." @default.
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- W2322991952 date "2013-11-11" @default.
- W2322991952 modified "2023-09-25" @default.
- W2322991952 title "Gold Network Structures in Rhombohedral and Monoclinic Sr<sub>2</sub>Au<sub>6</sub>(Au,T)<sub>3</sub> (T = Zn, Ga). A Transition via Relaxation" @default.
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- W2322991952 doi "https://doi.org/10.1021/ic402145k" @default.
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