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Trigermanides AEGe(3) (AE = Ca, Sr, Ba): chemical bonding and superconductivity

机译:Trigermanides AEGe(3)(AE = Ca,Sr,Ba):化学键合和超导电性

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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).
机译:Trigermanides AEGe(3)(tI32)的晶体结构(AE = Ca,Sr,Ba;对于SrGe3,空间群I4 / mmm:a = 7.7873(1),c = 12.0622(3)埃)包含Ge-2哑铃形成包围嵌入的AE原子的分层Ge子结构。通过应用电子可定位性方法进行的化学键分析表明,从AE原子到锗亚结构的电荷大量转移。哑铃内的键是共价两中心型的。对SrGe3的详细分析表明,Ge-2基团的键相反侧的相互作用不是孤对状的-正如从Zintl解释的晶体结构与被碱性隔开的阴离子Ge层所预期的那样-地球阳离子-Ge-2哑铃与相邻金属原子之间的多中心强极性。 CaGe3和BaGe3中存在类似的原子相互作用。碱土金属的变化对s,p电子化合物AEGe(3)中的超导转变温度影响很小。

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