BaCaWSnO6 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 BaO12 cuboctahedra that share faces with four equivalent Ca(1)O6 octahedra and 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 Ca(1)O6 octahedra and 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(6) atoms. In the fourth Ba site, Ba(4) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(6) atoms. Ca(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 CaO6 octahedra that share corners with six equivalent W(1)O6 octahedra,  a faceface with one Ba(1)O12 cuboctahedra, and  a faceface with one Ba(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 20-26°. 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 corners with six equivalent Ca(1)O6 octahedra,  a faceface with one Ba(1)O12 cuboctahedra, and  a faceface with one Ba(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 20-26°. There are four inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a square co-planar geometry to four equivalent O(5) atoms. In the second Sn site, Sn(2) is bonded in a square co-planar geometry to four equivalent O(4) atoms. In the third Sn site, Sn(3) is bonded in a rectangular see-saw-like geometry to four equivalent O(2) atoms. In the fourth Sn site, Sn(4) is bonded in a rectangular see-saw-like geometry to four equivalent O(3) atoms. There are six inequivalent O sites. In the first O site, O(5) is bonded in a 4-coordinate geometry to one Ba(2), one Ca(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(3), one Ba(4), one Ca(1), and one W(1) atom. In the third O site, O(1) is bonded to one Ba(1), one Ba(4), one Ca(1), and one W(1) atom to form a mixture of distorted corner and edge-sharing OBa2CaW trigonal pyramids. In the fourth O site, O(2) is bonded in a 5-coordinate geometry to one Ba(1), one Ba(3), one Ca(1), one W(1), and one Sn(3) atom. In the fifth O site, O(3) is bonded in a 4-coordinate geometry to one Ba(1), one Ca(1), one W(1), and one Sn(4) atom. In the sixth O site, O(4) is bonded in a 4-coordinate geometry to one Ba(2), one Ca(1), one W(1), and one Sn(2) atom.
BaCaWSnO6 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 BaO12 cuboctahedra that share faces with four equivalent Ca(1)O6 octahedra and faces with four equivalent W(1)O6 octahedra. All Ba(1)-O(1) bond lengths are 2.93 Å. All Ba(1)-O(2) bond lengths are 2.99 Å. All Ba(1)-O(3) bond lengths are 3.03 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 Ca(1)O6 octahedra and faces with four equivalent W(1)O6 octahedra. All Ba(2)-O(4) bond lengths are 2.97 Å. All Ba(2)-O(5) bond lengths are 2.98 Å. All Ba(2)-O(6) bond lengths are 3.00 Å. In the third Ba site, Ba(3) is bonded in a 8-coordinate geometry to four equivalent O(2) and four equivalent O(6) atoms. All Ba(3)-O(2) bond lengths are 3.04 Å. All Ba(3)-O(6) bond lengths are 2.66 Å. In the fourth Ba site, Ba(4) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(6) atoms. All Ba(4)-O(1) bond lengths are 2.66 Å. All Ba(4)-O(6) bond lengths are 3.03 Å. Ca(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 CaO6 octahedra that share corners with six equivalent W(1)O6 octahedra,  a faceface with one Ba(1)O12 cuboctahedra, and  a faceface with one Ba(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 20-26°. The Ca(1)-O(1) bond length is 2.31 Å. The Ca(1)-O(2) bond length is 2.43 Å. The Ca(1)-O(3) bond length is 2.29 Å. The Ca(1)-O(4) bond length is 2.34 Å. The Ca(1)-O(5) bond length is 2.31 Å. The Ca(1)-O(6) bond length is 2.37 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 corners with six equivalent Ca(1)O6 octahedra,  a faceface with one Ba(1)O12 cuboctahedra, and  a faceface with one Ba(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 20-26°. The W(1)-O(1) bond length is 1.94 Å. The W(1)-O(2) bond length is 1.99 Å. The W(1)-O(3) bond length is 1.96 Å. The W(1)-O(4) bond length is 1.98 Å. The W(1)-O(5) bond length is 1.96 Å. The W(1)-O(6) bond length is 1.96 Å. There are four inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a square co-planar geometry to four equivalent O(5) atoms. All Sn(1)-O(5) bond lengths are 2.51 Å. In the second Sn site, Sn(2) is bonded in a square co-planar geometry to four equivalent O(4) atoms. All Sn(2)-O(4) bond lengths are 2.52 Å. In the third Sn site, Sn(3) is bonded in a rectangular see-saw-like geometry to four equivalent O(2) atoms. All Sn(3)-O(2) bond lengths are 2.54 Å. In the fourth Sn site, Sn(4) is bonded in a rectangular see-saw-like geometry to four equivalent O(3) atoms. All Sn(4)-O(3) bond lengths are 2.50 Å. There are six inequivalent O sites. In the first O site, O(5) is bonded in a 4-coordinate geometry to one Ba(2), one Ca(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(3), one Ba(4), one Ca(1), and one W(1) atom. In the third O site, O(1) is bonded to one Ba(1), one Ba(4), one Ca(1), and one W(1) atom to form a mixture of distorted corner and edge-sharing OBa2CaW trigonal pyramids. In the fourth O site, O(2) is bonded in a 5-coordinate geometry to one Ba(1), one Ba(3), one Ca(1), one W(1), and one Sn(3) atom. In the fifth O site, O(3) is bonded in a 4-coordinate geometry to one Ba(1), one Ca(1), one W(1), and one Sn(4) atom. In the sixth O site, O(4) is bonded in a 4-coordinate geometry to one Ba(2), one Ca(1), one W(1), and one Sn(2) atom.