Germanium Dumbbells in a New Superconducting Modification of BaGe3

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• 作者：Rodrigo Castillo ; Alexey I. Baranov ; Ulrich Burkhardt ; Raul Cardoso-Gil ; Walter Schnelle ; Matej Bobnar ; Ulrich Schwarz
• 刊名：Inorganic Chemistry
• 出版年：2016
• 出版时间：May 2, 2016
• 年：2016
• 卷：55
• 期：9
• 页码：4498-4503
• 全文大小：396K
• 年卷期：0
• ISSN：1520-510X

文摘

We report the high-pressure high-temperature synthesis (P = 15 GPa, T = 1300 K) of BaGe₃(tI32) adopting a CaGe₃-type crystal structure. Bonding analysis reveals layers of covalently bonded germanium dumbbells being involved in multicenter Ba–Ge interactions. Physical measurements evidence metal-type electrical conductivity and a transition to a superconducting state at 6.5 K. Chemical bonding and physical properties of the new modification are discussed in comparison to the earlier described hexagonal form BaGe₃(hP8) with a columnar arrangement of Ge₃ triangles.