Bi2O3 crystallizes in the monoclinic Pm space group. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(1), and two equivalent O(3) atoms. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Bi(1) and two equivalent Bi(2) atoms to form a mixture of corner and edge-sharing OBi4 tetrahedra. In the second O site, O(2) is bonded in a trigonal planar geometry to one Bi(1) and two equivalent Bi(2) atoms. In the third O site, O(3) is bonded to two equivalent Bi(1) and two equivalent Bi(2) atoms to form a mixture of distorted corner and edge-sharing OBi4 tetrahedra.
Bi2O3 crystallizes in the monoclinic Pm space group. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(1), and two equivalent O(3) atoms. The Bi(1)-O(2) bond length is 2.30 Å. There is one shorter (2.17 Å) and one longer (2.55 Å) Bi(1)-O(1) bond length. Both Bi(1)-O(3) bond lengths are 2.24 Å. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Both Bi(2)-O(1) bond lengths are 2.38 Å. Both Bi(2)-O(2) bond lengths are 2.34 Å. There is one shorter (2.18 Å) and one longer (2.76 Å) Bi(2)-O(3) bond length. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Bi(1) and two equivalent Bi(2) atoms to form a mixture of corner and edge-sharing OBi4 tetrahedra. In the second O site, O(2) is bonded in a trigonal planar geometry to one Bi(1) and two equivalent Bi(2) atoms. In the third O site, O(3) is bonded to two equivalent Bi(1) and two equivalent Bi(2) atoms to form a mixture of distorted corner and edge-sharing OBi4 tetrahedra.