Ba2Si is Cotunnite structured and crystallizes in the orthorhombic Pnma space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a distorted trigonal non-coplanar geometry to three equivalent Si(1) atoms. In the second Ba site, Ba(2) is bonded to four equivalent Si(1) atoms to form a mixture of corner and edge-sharing BaSi4 tetrahedra. Si(1) is bonded in a 7-coordinate geometry to three equivalent Ba(1) and four equivalent Ba(2) atoms.
Ba2Si is Cotunnite structured and crystallizes in the orthorhombic Pnma space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a distorted trigonal non-coplanar geometry to three equivalent Si(1) atoms. There is one shorter (3.38 Å) and two longer (3.63 Å) Ba(1)-Si(1) bond lengths. In the second Ba site, Ba(2) is bonded to four equivalent Si(1) atoms to form a mixture of corner and edge-sharing BaSi4 tetrahedra. There are a spread of Ba(2)-Si(1) bond distances ranging from 3.34-3.41 Å. Si(1) is bonded in a 7-coordinate geometry to three equivalent Ba(1) and four equivalent Ba(2) atoms.