BaSrEuWO6 crystallizes in the tetragonal P42_12 space group. Ba(1) is bonded in a distorted body-centered cubic geometry to four equivalent O(1) and four equivalent O(3) atoms. Sr(1) is bonded to one O(1), one O(2), and four equivalent O(3) atoms to form SrO6 octahedra that share corners with six equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-32°. Eu(1) is bonded in a 8-coordinate geometry to four equivalent O(2) and four equivalent O(3) atoms. W(1) is bonded to one O(1), one O(2), and four equivalent O(3) atoms to form WO6 octahedra that share corners with six equivalent Sr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-32°. There are three inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Ba(1), one Sr(1), and one W(1) atom to form distorted OBa4SrW octahedra that share corners with four equivalent O(1)Ba4SrW octahedra, corners with eight equivalent O(3)BaSrEuW tetrahedra, edges with four equivalent O(1)Ba4SrW octahedra, and edges with eight equivalent O(3)BaSrEuW tetrahedra. The corner-sharing octahedral tilt angles are 11°. In the second O site, O(2) is bonded in a distorted linear geometry to one Sr(1), four equivalent Eu(1), and one W(1) atom. In the third O site, O(3) is bonded to one Ba(1), one Sr(1), one Eu(1), and one W(1) atom to form distorted OBaSrEuW tetrahedra that share corners with two equivalent O(1)Ba4SrW octahedra, corners with ten equivalent O(3)BaSrEuW tetrahedra, edges with two equivalent O(1)Ba4SrW octahedra, and  an edgeedge with one O(3)BaSrEuW tetrahedra. The corner-sharing octahedral tilt angles range from 66-68°.
BaSrEuWO6 crystallizes in the tetragonal P42_12 space group. Ba(1) is bonded in a distorted body-centered cubic geometry to four equivalent O(1) and four equivalent O(3) atoms. All Ba(1)-O(1) bond lengths are 3.02 Å. All Ba(1)-O(3) bond lengths are 2.78 Å. Sr(1) is bonded to one O(1), one O(2), and four equivalent O(3) atoms to form SrO6 octahedra that share corners with six equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-32°. The Sr(1)-O(1) bond length is 2.48 Å. The Sr(1)-O(2) bond length is 2.35 Å. All Sr(1)-O(3) bond lengths are 2.46 Å. Eu(1) is bonded in a 8-coordinate geometry to four equivalent O(2) and four equivalent O(3) atoms. All Eu(1)-O(2) bond lengths are 3.01 Å. All Eu(1)-O(3) bond lengths are 2.60 Å. W(1) is bonded to one O(1), one O(2), and four equivalent O(3) atoms to form WO6 octahedra that share corners with six equivalent Sr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-32°. The W(1)-O(1) bond length is 2.00 Å. The W(1)-O(2) bond length is 1.95 Å. All W(1)-O(3) bond lengths are 1.96 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Ba(1), one Sr(1), and one W(1) atom to form distorted OBa4SrW octahedra that share corners with four equivalent O(1)Ba4SrW octahedra, corners with eight equivalent O(3)BaSrEuW tetrahedra, edges with four equivalent O(1)Ba4SrW octahedra, and edges with eight equivalent O(3)BaSrEuW tetrahedra. The corner-sharing octahedral tilt angles are 11°. In the second O site, O(2) is bonded in a distorted linear geometry to one Sr(1), four equivalent Eu(1), and one W(1) atom. In the third O site, O(3) is bonded to one Ba(1), one Sr(1), one Eu(1), and one W(1) atom to form distorted OBaSrEuW tetrahedra that share corners with two equivalent O(1)Ba4SrW octahedra, corners with ten equivalent O(3)BaSrEuW tetrahedra, edges with two equivalent O(1)Ba4SrW octahedra, and  an edgeedge with one O(3)BaSrEuW tetrahedra. The corner-sharing octahedral tilt angles range from 66-68°.