view article
Figure 3
(a) A slab of i-YbCd5.7 in 3D physical space. (b) The packing of RTH units in the 2/1 and 1/1 cubic PAs. (c) The concentric shell structure of the RTH unit (from outermost to innermost): a Cd icosadodecahedron (30 atoms), an RE icosahedron (12 atoms), a Cd dodecahedron (20 atoms) and an inner Cd tetrahedron decorated by Cd atoms at the vertices and mid-edge positions. The RE atoms occupy two crystallographically distinct sites: the 12 vertices of the icosahedron and two sites located along the body-diagonal axis of the AR unit, which fills the interstitial space between neighbouring RTH units. The images are adapted from Takakura et al. (2007View full citation).

IUCrJ
Volume 13| Part 5| September 2026| Pages 552-579
ISSN: 2052-2525
https://doi.org/10.1107/S2052252526006263