Ba2AuSi3 is hexagonal omega structure-derived structured and crystallizes in the hexagonal P-6m2 space group. Ba(1) is bonded to three equivalent Au(1), three equivalent Si(1), three equivalent Si(2), and three equivalent Si(3) atoms to form a mixture of face and edge-sharing BaSi9Au3 cuboctahedra. Au(1) is bonded in a distorted trigonal planar geometry to six equivalent Ba(1) and three equivalent Si(2) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to six equivalent Ba(1) and three equivalent Si(3) atoms. In the second Si site, Si(2) is bonded in a distorted trigonal planar geometry to six equivalent Ba(1) and three equivalent Au(1) atoms. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to six equivalent Ba(1) and three equivalent Si(1) atoms.
Ba2AuSi3 is hexagonal omega structure-derived structured and crystallizes in the hexagonal P-6m2 space group. Ba(1) is bonded to three equivalent Au(1), three equivalent Si(1), three equivalent Si(2), and three equivalent Si(3) atoms to form a mixture of face and edge-sharing BaSi9Au3 cuboctahedra. All Ba(1)-Au(1) bond lengths are 3.53 Å. All Ba(1)-Si(1) bond lengths are 3.54 Å. All Ba(1)-Si(2) bond lengths are 3.53 Å. All Ba(1)-Si(3) bond lengths are 3.54 Å. Au(1) is bonded in a distorted trigonal planar geometry to six equivalent Ba(1) and three equivalent Si(2) atoms. All Au(1)-Si(2) bond lengths are 2.46 Å. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to six equivalent Ba(1) and three equivalent Si(3) atoms. All Si(1)-Si(3) bond lengths are 2.46 Å. In the second Si site, Si(2) is bonded in a distorted trigonal planar geometry to six equivalent Ba(1) and three equivalent Au(1) atoms. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to six equivalent Ba(1) and three equivalent Si(1) atoms.