Al2(BiO3)3 crystallizes in the tetragonal P4/mmm space group. Al(1) is bonded to one O(3), one O(4), and four equivalent O(1) atoms to form AlO6 octahedra that share corners with five equivalent Al(1)O6 octahedra and faces with four equivalent Bi(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-13°. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 8-coordinate geometry to four equivalent O(2) and four equivalent O(3) atoms. In the second Bi site, Bi(2) is bonded to four equivalent O(4) and eight equivalent O(1) atoms to form BiO12 cuboctahedra that share corners with four equivalent Bi(2)O12 cuboctahedra, faces with four equivalent Bi(2)O12 cuboctahedra, and faces with eight equivalent Al(1)O6 octahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to two equivalent Al(1) and two equivalent Bi(2) atoms. In the second O site, O(2) is bonded in a square co-planar geometry to four equivalent Bi(1) atoms. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Al(1) and four equivalent Bi(1) atoms. In the fourth O site, O(4) is bonded to two equivalent Al(1) and four equivalent Bi(2) atoms to form a mixture of corner and edge-sharing OAl2Bi4 octahedra. The corner-sharing octahedra are not tilted.
Al2(BiO3)3 crystallizes in the tetragonal P4/mmm space group. Al(1) is bonded to one O(3), one O(4), and four equivalent O(1) atoms to form AlO6 octahedra that share corners with five equivalent Al(1)O6 octahedra and faces with four equivalent Bi(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-13°. The Al(1)-O(3) bond length is 1.88 Å. The Al(1)-O(4) bond length is 2.11 Å. All Al(1)-O(1) bond lengths are 1.83 Å. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 8-coordinate geometry to four equivalent O(2) and four equivalent O(3) atoms. All Bi(1)-O(2) bond lengths are 2.46 Å. All Bi(1)-O(3) bond lengths are 2.66 Å. In the second Bi site, Bi(2) is bonded to four equivalent O(4) and eight equivalent O(1) atoms to form BiO12 cuboctahedra that share corners with four equivalent Bi(2)O12 cuboctahedra, faces with four equivalent Bi(2)O12 cuboctahedra, and faces with eight equivalent Al(1)O6 octahedra. All Bi(2)-O(4) bond lengths are 2.57 Å. All Bi(2)-O(1) bond lengths are 2.63 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to two equivalent Al(1) and two equivalent Bi(2) atoms. In the second O site, O(2) is bonded in a square co-planar geometry to four equivalent Bi(1) atoms. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Al(1) and four equivalent Bi(1) atoms. In the fourth O site, O(4) is bonded to two equivalent Al(1) and four equivalent Bi(2) atoms to form a mixture of corner and edge-sharing OAl2Bi4 octahedra. The corner-sharing octahedra are not tilted.