KSbO3 crystallizes in the triclinic P-1 space group. K(1) is bonded in a 5-coordinate geometry to one O(2), one O(3), and three equivalent O(1) atoms. Sb(1) is bonded in a 6-coordinate geometry to one O(1), two equivalent O(3), and three equivalent O(2) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded to three equivalent K(1) and one Sb(1) atom to form OK3Sb tetrahedra that share corners with two equivalent O(1)K3Sb tetrahedra, corners with three equivalent O(3)KSb2O tetrahedra, corners with six equivalent O(2)KSb3 trigonal pyramids,  an edgeedge with one O(3)KSb2O tetrahedra, and edges with two equivalent O(1)K3Sb tetrahedra. In the second O site, O(2) is bonded to one K(1) and three equivalent Sb(1) atoms to form distorted OKSb3 trigonal pyramids that share corners with five equivalent O(3)KSb2O tetrahedra, corners with six equivalent O(1)K3Sb tetrahedra, corners with two equivalent O(2)KSb3 trigonal pyramids,  an edgeedge with one O(3)KSb2O tetrahedra, and edges with two equivalent O(2)KSb3 trigonal pyramids. In the third O site, O(3) is bonded to one K(1), two equivalent Sb(1), and one O(3) atom to form OKSb2O tetrahedra that share corners with three equivalent O(1)K3Sb tetrahedra, corners with five equivalent O(2)KSb3 trigonal pyramids,  an edgeedge with one O(1)K3Sb tetrahedra,  an edgeedge with one O(3)KSb2O tetrahedra, and  an edgeedge with one O(2)KSb3 trigonal pyramid.
KSbO3 crystallizes in the triclinic P-1 space group. K(1) is bonded in a 5-coordinate geometry to one O(2), one O(3), and three equivalent O(1) atoms. The K(1)-O(2) bond length is 2.86 Å. The K(1)-O(3) bond length is 2.64 Å. There are a spread of K(1)-O(1) bond distances ranging from 2.50-2.55 Å. Sb(1) is bonded in a 6-coordinate geometry to one O(1), two equivalent O(3), and three equivalent O(2) atoms. The Sb(1)-O(1) bond length is 1.88 Å. There is one shorter (2.16 Å) and one longer (2.46 Å) Sb(1)-O(3) bond length. There are a spread of Sb(1)-O(2) bond distances ranging from 2.14-2.49 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded to three equivalent K(1) and one Sb(1) atom to form OK3Sb tetrahedra that share corners with two equivalent O(1)K3Sb tetrahedra, corners with three equivalent O(3)KSb2O tetrahedra, corners with six equivalent O(2)KSb3 trigonal pyramids,  an edgeedge with one O(3)KSb2O tetrahedra, and edges with two equivalent O(1)K3Sb tetrahedra. In the second O site, O(2) is bonded to one K(1) and three equivalent Sb(1) atoms to form distorted OKSb3 trigonal pyramids that share corners with five equivalent O(3)KSb2O tetrahedra, corners with six equivalent O(1)K3Sb tetrahedra, corners with two equivalent O(2)KSb3 trigonal pyramids,  an edgeedge with one O(3)KSb2O tetrahedra, and edges with two equivalent O(2)KSb3 trigonal pyramids. In the third O site, O(3) is bonded to one K(1), two equivalent Sb(1), and one O(3) atom to form OKSb2O tetrahedra that share corners with three equivalent O(1)K3Sb tetrahedra, corners with five equivalent O(2)KSb3 trigonal pyramids,  an edgeedge with one O(1)K3Sb tetrahedra,  an edgeedge with one O(3)KSb2O tetrahedra, and  an edgeedge with one O(2)KSb3 trigonal pyramid. The O(3)-O(3) bond length is 1.48 Å.