BaEuWSnO6 crystallizes in the orthorhombic P222 space group. There are four inequivalent Ba sites. In the first Ba site, Ba(1) is bonded to four equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms to form distorted BaO12 cuboctahedra that share faces with four equivalent W(1)O6 octahedra. In the second Ba site, Ba(2) is bonded to four equivalent O(4), four equivalent O(5), and four equivalent O(6) atoms to form BaO12 cuboctahedra that share faces with four equivalent W(1)O6 octahedra. In the third Ba site, Ba(3) is bonded in a 8-coordinate geometry to four equivalent O(2) and four equivalent O(4) atoms. In the fourth Ba site, Ba(4) is bonded in a 4-coordinate geometry to four equivalent O(1) and four equivalent O(6) atoms. There are four inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a distorted body-centered cubic geometry to four equivalent O(1) and four equivalent O(5) atoms. In the second Eu site, Eu(2) is bonded in a distorted square co-planar geometry to four equivalent O(6) atoms. In the third Eu site, Eu(3) is bonded in a distorted rectangular see-saw-like geometry to four equivalent O(4) atoms. In the fourth Eu site, Eu(4) is bonded in a distorted square co-planar geometry to four equivalent O(3) atoms. W(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form WO6 octahedra that share  a faceface with one Ba(1)O12 cuboctahedra and  a faceface with one Ba(2)O12 cuboctahedra. Sn(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. There are six inequivalent O sites. In the first O site, O(5) is bonded in a 3-coordinate geometry to one Ba(2), one Eu(1), one W(1), and one Sn(1) atom. In the second O site, O(6) is bonded in a 5-coordinate geometry to one Ba(2), one Ba(4), one Eu(2), one W(1), and one Sn(1) atom. In the third O site, O(1) is bonded in a 5-coordinate geometry to one Ba(1), one Ba(4), one Eu(1), one W(1), and one Sn(1) atom. In the fourth O site, O(2) is bonded in a 1-coordinate geometry to one Ba(1), one Ba(3), one W(1), and one Sn(1) atom. In the fifth O site, O(3) is bonded in a 3-coordinate geometry to one Ba(1), one Eu(4), one W(1), and one Sn(1) atom. In the sixth O site, O(4) is bonded in a 5-coordinate geometry to one Ba(2), one Ba(3), one Eu(3), one W(1), and one Sn(1) atom.
BaEuWSnO6 crystallizes in the orthorhombic P222 space group. There are four inequivalent Ba sites. In the first Ba site, Ba(1) is bonded to four equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms to form distorted BaO12 cuboctahedra that share faces with four equivalent W(1)O6 octahedra. All Ba(1)-O(1) bond lengths are 3.22 Å. All Ba(1)-O(2) bond lengths are 2.88 Å. All Ba(1)-O(3) bond lengths are 3.15 Å. In the second Ba site, Ba(2) is bonded to four equivalent O(4), four equivalent O(5), and four equivalent O(6) atoms to form BaO12 cuboctahedra that share faces with four equivalent W(1)O6 octahedra. All Ba(2)-O(4) bond lengths are 3.05 Å. All Ba(2)-O(5) bond lengths are 3.03 Å. All Ba(2)-O(6) bond lengths are 3.02 Å. In the third Ba site, Ba(3) is bonded in a 8-coordinate geometry to four equivalent O(2) and four equivalent O(4) atoms. All Ba(3)-O(2) bond lengths are 2.68 Å. All Ba(3)-O(4) bond lengths are 3.24 Å. In the fourth Ba site, Ba(4) is bonded in a 4-coordinate geometry to four equivalent O(1) and four equivalent O(6) atoms. All Ba(4)-O(1) bond lengths are 2.72 Å. All Ba(4)-O(6) bond lengths are 3.21 Å. There are four inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a distorted body-centered cubic geometry to four equivalent O(1) and four equivalent O(5) atoms. All Eu(1)-O(1) bond lengths are 2.93 Å. All Eu(1)-O(5) bond lengths are 2.47 Å. In the second Eu site, Eu(2) is bonded in a distorted square co-planar geometry to four equivalent O(6) atoms. All Eu(2)-O(6) bond lengths are 2.58 Å. In the third Eu site, Eu(3) is bonded in a distorted rectangular see-saw-like geometry to four equivalent O(4) atoms. All Eu(3)-O(4) bond lengths are 2.41 Å. In the fourth Eu site, Eu(4) is bonded in a distorted square co-planar geometry to four equivalent O(3) atoms. All Eu(4)-O(3) bond lengths are 2.39 Å. W(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form WO6 octahedra that share  a faceface with one Ba(1)O12 cuboctahedra and  a faceface with one Ba(2)O12 cuboctahedra. The W(1)-O(1) bond length is 2.03 Å. The W(1)-O(2) bond length is 1.90 Å. The W(1)-O(3) bond length is 1.99 Å. The W(1)-O(4) bond length is 1.91 Å. The W(1)-O(5) bond length is 2.05 Å. The W(1)-O(6) bond length is 1.96 Å. Sn(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. The Sn(1)-O(1) bond length is 2.25 Å. The Sn(1)-O(2) bond length is 2.77 Å. The Sn(1)-O(3) bond length is 2.40 Å. The Sn(1)-O(4) bond length is 2.69 Å. The Sn(1)-O(5) bond length is 2.19 Å. The Sn(1)-O(6) bond length is 2.56 Å. There are six inequivalent O sites. In the first O site, O(5) is bonded in a 3-coordinate geometry to one Ba(2), one Eu(1), one W(1), and one Sn(1) atom. In the second O site, O(6) is bonded in a 5-coordinate geometry to one Ba(2), one Ba(4), one Eu(2), one W(1), and one Sn(1) atom. In the third O site, O(1) is bonded in a 5-coordinate geometry to one Ba(1), one Ba(4), one Eu(1), one W(1), and one Sn(1) atom. In the fourth O site, O(2) is bonded in a 1-coordinate geometry to one Ba(1), one Ba(3), one W(1), and one Sn(1) atom. In the fifth O site, O(3) is bonded in a 3-coordinate geometry to one Ba(1), one Eu(4), one W(1), and one Sn(1) atom. In the sixth O site, O(4) is bonded in a 5-coordinate geometry to one Ba(2), one Ba(3), one Eu(3), one W(1), and one Sn(1) atom.