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Carbon-free fullerenes: condensed and stuffed anionic examples in indium systems
Abstract:
Condensed, well-ordered analogs of the fullerenes occur in the hexagonal phases Na(96)In(97)Z(2) (Z = nickel, palladium, or platinum). Large cages of In(74) (D3h) and M(60) (= In(48)Na(12), D3d) share pentagonal faces to generate a double-hexagonal close-packed analog of NiAs. All these polyhedra are centered by partially disordered In(10)Z clusters within deltahedra of sodium atoms that cap all inner faces of the cages, namely, Z@In(10)@Na(39)@In(74) and Z@In(10)@Na(32)@Na(12)In(48) "onions" The highest filled bands in these compounds apparently involve localized electron pairs on surface features on In(74)-based layers. Structural and electronic relations between diamond and Naln (stuffed diamond structure) parallel those between certain fullerenes and Na(96)In(97)Z(2) and, presumably, other valence-driven intermetallic phases.
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