Notizen: Y7I6C3O: Ein Carbidoxid mit kondensierten Y6C-Oktaedern und Y4O-Tetraedern / Y7I6C3O: A Carbide Oxide with Condensed Y6C-Octahedra and Y4O-Tetrahedra

Abstract

The new compound Y7I6C3O is prepared by reaction of stoichiometric amounts of Y, YI3, Y2O3 and C in closed Ta capsules at 1370 K. Y7I6C3O forms bronze coloured, metallic, air and moisture sensitive crystals. It crystallizes in the space group Pmma (No. 51) with the lattice constants a = 2249.4(4), b = 383.7(1), c = 1079.1(1) pm. Within the crystal structure the C atoms and the O atoms are surrounded by Y atoms octahedrally and tetrahedrally, respectively. The Y6C octahedra and Y4O tetrahedra are condensed to form ondulated layers, which are separated by double layers of I atoms.