The crystal structure of the compound Hf9-xCo7+xIn14 (x=0.86)

New ternary indides Hf8.14Co7.86In14 have been found in the system Hf-Co-In at 870 K. The crystal structure of Hf8.14Co7.86In14 has been refined using single-crystal X-ray data: Zr9Co7In14 structure type, Fm3m space group, Z= 4, a=13.203(2) Angstrom, V=2302(1) Angstrom(3), R=0.0453 for 213 unique ref lections hkl (KUMA-Diffraction KM-4 diffractometer, Mo K alpha radiation). The coordination polyhedra of the Hf atoms have 12 and 14 vertices, those o f the In atoms have 14 and 16 vertices and those of the Co atoms have nine and 14 vertices. The structure can be described as a stacking of columns of cubes, tetragonal antiprisms and cubooctahedrons extending along the coord inate axes, with Frank-Kasper polyhedra and empty tetrahedra between these columns. (C) 1999 Elsevier Science S.A. All rights reserved.