Bi4O9 crystallizes in the tetragonal P4/n space group. Bi(1) is bonded to one O(1), two equivalent O(2), and three equivalent O(3) atoms to form a mixture of distorted edge and corner-sharing BiO6 octahedra. The corner-sharing octahedral tilt angles range from 9-25°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a square co-planar geometry to four equivalent Bi(1) atoms. In the second O site, O(2) is bonded in a bent 150 degrees geometry to two equivalent Bi(1) atoms. In the third O site, O(3) is bonded in a distorted T-shaped geometry to three equivalent Bi(1) atoms.
Bi4O9 crystallizes in the tetragonal P4/n space group. Bi(1) is bonded to one O(1), two equivalent O(2), and three equivalent O(3) atoms to form a mixture of distorted edge and corner-sharing BiO6 octahedra. The corner-sharing octahedral tilt angles range from 9-25°. The Bi(1)-O(1) bond length is 2.45 Å. There is one shorter (2.09 Å) and one longer (2.12 Å) Bi(1)-O(2) bond length. There are a spread of Bi(1)-O(3) bond distances ranging from 2.22-2.26 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a square co-planar geometry to four equivalent Bi(1) atoms. In the second O site, O(2) is bonded in a bent 150 degrees geometry to two equivalent Bi(1) atoms. In the third O site, O(3) is bonded in a distorted T-shaped geometry to three equivalent Bi(1) atoms.