BaBi4O7 crystallizes in the hexagonal P6_3mc space group. Ba(1) is bonded in a 3-coordinate geometry to three equivalent O(3) atoms. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form corner-sharing BiO4 tetrahedra. In the second Bi site, Bi(2) is bonded to one O(2) and three equivalent O(1) atoms to form distorted corner-sharing BiO4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Bi(1) and one Bi(2) atom. In the second O site, O(2) is bonded in a tetrahedral geometry to one Bi(2) and three equivalent Bi(1) atoms. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Ba(1) and two equivalent Bi(1) atoms.
BaBi4O7 crystallizes in the hexagonal P6_3mc space group. Ba(1) is bonded in a 3-coordinate geometry to three equivalent O(3) atoms. All Ba(1)-O(3) bond lengths are 2.62 Å. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form corner-sharing BiO4 tetrahedra. The Bi(1)-O(1) bond length is 2.19 Å. The Bi(1)-O(2) bond length is 2.38 Å. Both Bi(1)-O(3) bond lengths are 2.25 Å. In the second Bi site, Bi(2) is bonded to one O(2) and three equivalent O(1) atoms to form distorted corner-sharing BiO4 tetrahedra. The Bi(2)-O(2) bond length is 2.83 Å. All Bi(2)-O(1) bond lengths are 2.14 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Bi(1) and one Bi(2) atom. In the second O site, O(2) is bonded in a tetrahedral geometry to one Bi(2) and three equivalent Bi(1) atoms. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Ba(1) and two equivalent Bi(1) atoms.