Ba3Cr2WO9 is (Cubic) Perovskite-derived structured and crystallizes in the hexagonal P-62c space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded to six equivalent O(1) and six equivalent O(2) atoms to form BaO12 cuboctahedra that share corners with six equivalent Ba(1)O12 cuboctahedra, corners with six equivalent Ba(2)O12 cuboctahedra, faces with six equivalent Ba(2)O12 cuboctahedra, faces with two equivalent W(1)O6 octahedra, and faces with six equivalent Cr(1)O6 octahedra. In the second Ba site, Ba(2) is bonded to three equivalent O(1) and nine equivalent O(2) atoms to form distorted BaO12 cuboctahedra that share corners with three equivalent Ba(1)O12 cuboctahedra, corners with six equivalent Ba(2)O12 cuboctahedra, corners with three equivalent Cr(1)O6 octahedra, faces with three equivalent Ba(1)O12 cuboctahedra, faces with four equivalent Ba(2)O12 cuboctahedra, faces with three equivalent W(1)O6 octahedra, and faces with four equivalent Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles are 8°. W(1) is bonded to six equivalent O(2) atoms to form WO6 octahedra that share corners with six equivalent Cr(1)O6 octahedra, faces with two equivalent Ba(1)O12 cuboctahedra, and faces with six equivalent Ba(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 1°. Cr(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form CrO6 octahedra that share corners with three equivalent Ba(2)O12 cuboctahedra, corners with three equivalent W(1)O6 octahedra, faces with three equivalent Ba(1)O12 cuboctahedra, faces with four equivalent Ba(2)O12 cuboctahedra, and  a faceface with one Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles are 1°. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ba(1), two equivalent Ba(2), and two equivalent Cr(1) atoms to form a mixture of distorted corner and face-sharing OBa4Cr2 octahedra. The corner-sharing octahedral tilt angles range from 6-60°. In the second O site, O(2) is bonded in a distorted linear geometry to one Ba(1), three equivalent Ba(2), one W(1), and one Cr(1) atom.
Ba3Cr2WO9 is (Cubic) Perovskite-derived structured and crystallizes in the hexagonal P-62c space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded to six equivalent O(1) and six equivalent O(2) atoms to form BaO12 cuboctahedra that share corners with six equivalent Ba(1)O12 cuboctahedra, corners with six equivalent Ba(2)O12 cuboctahedra, faces with six equivalent Ba(2)O12 cuboctahedra, faces with two equivalent W(1)O6 octahedra, and faces with six equivalent Cr(1)O6 octahedra. There are three shorter (2.90 Å) and three longer (2.91 Å) Ba(1)-O(1) bond lengths. All Ba(1)-O(2) bond lengths are 2.94 Å. In the second Ba site, Ba(2) is bonded to three equivalent O(1) and nine equivalent O(2) atoms to form distorted BaO12 cuboctahedra that share corners with three equivalent Ba(1)O12 cuboctahedra, corners with six equivalent Ba(2)O12 cuboctahedra, corners with three equivalent Cr(1)O6 octahedra, faces with three equivalent Ba(1)O12 cuboctahedra, faces with four equivalent Ba(2)O12 cuboctahedra, faces with three equivalent W(1)O6 octahedra, and faces with four equivalent Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles are 8°. All Ba(2)-O(1) bond lengths are 2.78 Å. There are six shorter (2.93 Å) and three longer (3.13 Å) Ba(2)-O(2) bond lengths. W(1) is bonded to six equivalent O(2) atoms to form WO6 octahedra that share corners with six equivalent Cr(1)O6 octahedra, faces with two equivalent Ba(1)O12 cuboctahedra, and faces with six equivalent Ba(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 1°. All W(1)-O(2) bond lengths are 1.96 Å. Cr(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form CrO6 octahedra that share corners with three equivalent Ba(2)O12 cuboctahedra, corners with three equivalent W(1)O6 octahedra, faces with three equivalent Ba(1)O12 cuboctahedra, faces with four equivalent Ba(2)O12 cuboctahedra, and  a faceface with one Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles are 1°. All Cr(1)-O(1) bond lengths are 1.99 Å. All Cr(1)-O(2) bond lengths are 2.09 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ba(1), two equivalent Ba(2), and two equivalent Cr(1) atoms to form a mixture of distorted corner and face-sharing OBa4Cr2 octahedra. The corner-sharing octahedral tilt angles range from 6-60°. In the second O site, O(2) is bonded in a distorted linear geometry to one Ba(1), three equivalent Ba(2), one W(1), and one Cr(1) atom.