Ba2Sb2O5 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded to one O(1), two equivalent O(3), and four equivalent O(2) atoms to form distorted edge-sharing BaO7 pentagonal bipyramids. In the second Ba site, Ba(2) is bonded in a 6-coordinate geometry to two equivalent O(2) and four equivalent O(3) atoms. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a distorted trigonal non-coplanar geometry to one O(1) and two equivalent O(2) atoms. In the second Sb site, Sb(2) is bonded in a distorted trigonal non-coplanar geometry to one O(1) and two equivalent O(3) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ba(1), one Sb(1), and one Sb(2) atom. In the second O site, O(2) is bonded to one Ba(2), two equivalent Ba(1), and one Sb(1) atom to form a mixture of distorted edge and corner-sharing OBa3Sb tetrahedra. In the third O site, O(3) is bonded to one Ba(1), two equivalent Ba(2), and one Sb(2) atom to form a mixture of distorted edge and corner-sharing OBa3Sb tetrahedra.
Ba2Sb2O5 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded to one O(1), two equivalent O(3), and four equivalent O(2) atoms to form distorted edge-sharing BaO7 pentagonal bipyramids. The Ba(1)-O(1) bond length is 3.04 Å. Both Ba(1)-O(3) bond lengths are 2.74 Å. There are two shorter (2.74 Å) and two longer (2.79 Å) Ba(1)-O(2) bond lengths. In the second Ba site, Ba(2) is bonded in a 6-coordinate geometry to two equivalent O(2) and four equivalent O(3) atoms. Both Ba(2)-O(2) bond lengths are 2.69 Å. There are two shorter (2.70 Å) and two longer (2.78 Å) Ba(2)-O(3) bond lengths. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a distorted trigonal non-coplanar geometry to one O(1) and two equivalent O(2) atoms. The Sb(1)-O(1) bond length is 2.02 Å. Both Sb(1)-O(2) bond lengths are 1.93 Å. In the second Sb site, Sb(2) is bonded in a distorted trigonal non-coplanar geometry to one O(1) and two equivalent O(3) atoms. The Sb(2)-O(1) bond length is 2.02 Å. Both Sb(2)-O(3) bond lengths are 1.93 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ba(1), one Sb(1), and one Sb(2) atom. In the second O site, O(2) is bonded to one Ba(2), two equivalent Ba(1), and one Sb(1) atom to form a mixture of distorted edge and corner-sharing OBa3Sb tetrahedra. In the third O site, O(3) is bonded to one Ba(1), two equivalent Ba(2), and one Sb(2) atom to form a mixture of distorted edge and corner-sharing OBa3Sb tetrahedra.