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  • Trigermanides AEGe(3) (AE = Ca, Sr, Ba) : chemical bonding and superconductivity
    Castillo, R. ...
    The crystal structures of the trigermanides AEGe(3) (tI32) (AE = Ca, Sr, Ba; space group I4/mmm, for SrGe3 : a = 7.7873(1), c = 12.0622(3)angstrom) comprise Ge-2 dumbbells forming layered Ge ... substructures which enclose embedded AE atoms. The chemical bonding analysis by application of the electron localizability approach reveals a substantial charge transfer from the AE atoms to the germanium substructure. The bonding within the dumbbells is of the covalent two-center type. A detailed analysis of SrGe3 reveals that the interaction on the bond-opposite side of the Ge-2 groups is not lone pair-like-as it would be expected from the Zintl-like interpretation of the crystal structure with anionic Ge layers separated by alkaline-earth cations-but multi-center strongly polar between the Ge-2 dumbbells and the adjacent metal atoms. Similar atomic interactions are present in CaGe3 and BaGe3. The variation of the alkaline-earth metal has a merely insignificant influence on the superconducting transition temperatures in the s,p-electron compounds AEGe(3).
    Vir: Zeitschrift für Naturforschung. B, A journal of chemical sciences. - ISSN 0932-0776 (Iss. 5, Vol. 71, 2016, str. 585-592)
    Vrsta gradiva - članek, sestavni del
    Leto - 2016
    Jezik - angleški
    COBISS.SI-ID - 32994599
    DOI

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