BaSeO4 crystallizes in the orthorhombic Pnma space group. Ba(1) is bonded in a 10-coordinate geometry to one O(2), three equivalent O(3), and six equivalent O(1) atoms. Se(1) is bonded in a tetrahedral geometry to one O(2), one O(3), and two equivalent O(1) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to three equivalent Ba(1) and one Se(1) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Ba(1) and one Se(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to three equivalent Ba(1) and one Se(1) atom.
BaSeO4 crystallizes in the orthorhombic Pnma space group. Ba(1) is bonded in a 10-coordinate geometry to one O(2), three equivalent O(3), and six equivalent O(1) atoms. The Ba(1)-O(2) bond length is 2.71 Å. There is one shorter (2.82 Å) and two longer (3.17 Å) Ba(1)-O(3) bond lengths. There are a spread of Ba(1)-O(1) bond distances ranging from 2.84-3.00 Å. Se(1) is bonded in a tetrahedral geometry to one O(2), one O(3), and two equivalent O(1) atoms. The Se(1)-O(2) bond length is 1.64 Å. The Se(1)-O(3) bond length is 1.65 Å. Both Se(1)-O(1) bond lengths are 1.66 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to three equivalent Ba(1) and one Se(1) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Ba(1) and one Se(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to three equivalent Ba(1) and one Se(1) atom.