KAsO3 crystallizes in the orthorhombic Pbcn space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(3), and four equivalent O(2) atoms. In the second K site, K(2) is bonded in a body-centered cubic geometry to two equivalent O(2) and six equivalent O(1) atoms. As(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form corner-sharing AsO4 tetrahedra. There are three inequivalent O sites. In the first O site, O(3) is bonded in a distorted trigonal planar geometry to one K(1) and two equivalent As(1) atoms. In the second O site, O(1) is bonded in a distorted single-bond geometry to one K(1), three equivalent K(2), and one As(1) atom. In the third O site, O(2) is bonded in a distorted single-bond geometry to one K(2), two equivalent K(1), and one As(1) atom.
KAsO3 crystallizes in the orthorhombic Pbcn space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(3), and four equivalent O(2) atoms. Both K(1)-O(1) bond lengths are 2.81 Å. Both K(1)-O(3) bond lengths are 2.81 Å. There are two shorter (2.75 Å) and two longer (3.09 Å) K(1)-O(2) bond lengths. In the second K site, K(2) is bonded in a body-centered cubic geometry to two equivalent O(2) and six equivalent O(1) atoms. Both K(2)-O(2) bond lengths are 2.75 Å. There are two shorter (2.81 Å) and four longer (2.84 Å) K(2)-O(1) bond lengths. As(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form corner-sharing AsO4 tetrahedra. The As(1)-O(1) bond length is 1.65 Å. The As(1)-O(2) bond length is 1.64 Å. There is one shorter (1.78 Å) and one longer (1.79 Å) As(1)-O(3) bond length. There are three inequivalent O sites. In the first O site, O(3) is bonded in a distorted trigonal planar geometry to one K(1) and two equivalent As(1) atoms. In the second O site, O(1) is bonded in a distorted single-bond geometry to one K(1), three equivalent K(2), and one As(1) atom. In the third O site, O(2) is bonded in a distorted single-bond geometry to one K(2), two equivalent K(1), and one As(1) atom.