Castillo Rodrigo, Baranov Alexey I, Burkhardt Ulrich, Cardoso-Gil Raul, Schnelle Walter, Bobnar Matej, Schwarz Ulrich
Max-Planck-Institut für Chemische Physik fester Stoffe , Nöthnitzer Straße 40, 01187 Dresden, Germany.
Inorg Chem. 2016 May 2;55(9):4498-503. doi: 10.1021/acs.inorgchem.6b00299. Epub 2016 Apr 11.
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.
我们报道了采用CaGe3型晶体结构的BaGe3（tI32）的高压高温合成（P = 15 GPa，T = 1300 K）。键合分析表明，共价键合的锗哑铃层参与了多中心Ba-Ge相互作用。物理测量证明其具有金属型电导率，并在6.5 K时转变为超导态。与早期描述的具有Ge3三角形柱状排列的六方晶型BaGe3（hP8）相比，讨论了这种新变体的化学键合和物理性质。
