BaSi2O5 crystallizes in the orthorhombic Pnma space group. Ba(1) is bonded in a 9-coordinate geometry to one O(3), two equivalent O(1), and six equivalent O(2) atoms. Si(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form corner-sharing SiO4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Ba(1) and two equivalent Si(1) atoms. In the second O site, O(2) is bonded in a distorted single-bond geometry to three equivalent Ba(1) and one Si(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Ba(1) and two equivalent Si(1) atoms.
BaSi2O5 crystallizes in the orthorhombic Pnma space group. Ba(1) is bonded in a 9-coordinate geometry to one O(3), two equivalent O(1), and six equivalent O(2) atoms. The Ba(1)-O(3) bond length is 3.00 Å. Both Ba(1)-O(1) bond lengths are 2.89 Å. There are a spread of Ba(1)-O(2) bond distances ranging from 2.75-3.05 Å. Si(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form corner-sharing SiO4 tetrahedra. The Si(1)-O(2) bond length is 1.58 Å. The Si(1)-O(3) bond length is 1.64 Å. Both Si(1)-O(1) bond lengths are 1.64 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Ba(1) and two equivalent Si(1) atoms. In the second O site, O(2) is bonded in a distorted single-bond geometry to three equivalent Ba(1) and one Si(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Ba(1) and two equivalent Si(1) atoms.