Materials Data on Tb(AlAu)2 by Materials Project

Abstract

TbAu2Al2 crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Tb is bonded in a 12-coordinate geometry to eight Au and eight Al atoms. There are four shorter (3.33 Å) and four longer (3.40 Å) Tb–Au bond lengths. There are four shorter (3.32 Å) and four longer (3.43 Å) Tb–Al bond lengths. There are two inequivalent Au sites. In the first Au site, Au is bonded to four equivalent Tb and four equivalent Al atoms to form distorted AuTb4Al4 tetrahedra that share corners with twelve equivalent AlTb4Au4 tetrahedra, edges with two equivalent AlTb4Au4 tetrahedra, edges with four equivalent AuTb4Al4 tetrahedra, and faces with four equivalent AuTb4Al4 tetrahedra. All Au–Al bond lengths are 2.58 Å. In the second Au site, Au is bonded in a 9-coordinate geometry to four equivalent Tb and five Al atoms. There are one shorter (2.49 Å) and four longer (2.59 Å) Au–Al bond lengths. There are two inequivalent Al sites. In the first Al site, Al is bonded to four equivalent Tb and four equivalent Au atoms to form AlTb4Au4 tetrahedra that share corners with twelve equivalent AuTb4Al4 tetrahedra, edges with two equivalent AuTb4Al4 tetrahedra, edges with four equivalent AlTb4Au4 tetrahedra, and faces with four equivalent AlTb4Au4 tetrahedra. In the second Al site, Al is bonded in a 5-coordinate geometry to four equivalent Tb and five Au atoms.