As2O5 crystallizes in the tetragonal P4_32_12 space group. There are two inequivalent As sites. In the first As site, As(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form AsO6 octahedra that share corners with two equivalent As(1)O6 octahedra and corners with four equivalent As(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 45°. In the second As site, As(2) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form corner-sharing AsO4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-57°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one As(1) and one As(2) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one As(1) and one As(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to two equivalent As(1) atoms.
As2O5 crystallizes in the tetragonal P4_32_12 space group. There are two inequivalent As sites. In the first As site, As(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form AsO6 octahedra that share corners with two equivalent As(1)O6 octahedra and corners with four equivalent As(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 45°. Both As(1)-O(1) bond lengths are 1.83 Å. Both As(1)-O(2) bond lengths are 1.85 Å. Both As(1)-O(3) bond lengths are 1.80 Å. In the second As site, As(2) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form corner-sharing AsO4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-57°. Both As(2)-O(1) bond lengths are 1.71 Å. Both As(2)-O(2) bond lengths are 1.68 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one As(1) and one As(2) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one As(1) and one As(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to two equivalent As(1) atoms.