[Zurück]

H. Nguyen, Y. Prots, W. Schnelle, B. Böhme, M. Baitinger, S. Paschen, YU. Grin:
"Preparation, crystal structure and physical properties of the superconducting cage compound Ba3Ge16Ir4";
Zeitschrift für Anorganische und Allgemeine Chemie, 640 (2014), 5; S. 760 - 767.

The cage compound Ba3Ge16Ir4 crystallizes with the Ba3Ge16Rh4 type of crystal structure, which represents a hierarchical derivative of the BaAl4 type. The crystal structure [Pearson symbol tI46, space group I4/mmm; a = 6.5312(2) Å, c = 22.2845(6) Å] was refined from single-crystal X-ray diffraction data. The phase was obtained after 10 d at 910 °C with small impurities of clathrate-I, BaGe7Ir2 and α-Ge remaining at the grain boundaries. Ba3Ge16Ir4 is a Pauli-paramagnetic metal, which becomes superconducting below Tc = 5.1 K. Electronic structure and analysis of the chemical bonding were performed based on density functional theory calculations. The physical properties are discussed in comparison to the isotypic phase Ba3Ge16Rh4.

Cage compounds; Clathrates; Superconductivity; Barium; Germanium; Iridium

http://dx.doi.org/10.1002/zaac.201300599