K2NbO6 crystallizes in the orthorhombic Imm2 space group. K(1) is bonded to four equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms to form KO12 cuboctahedra that share corners with twelve equivalent K(1)O12 cuboctahedra, faces with six equivalent K(1)O12 cuboctahedra, and faces with four equivalent Nb(1)O6 octahedra. Nb(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form NbO6 octahedra that share faces with eight equivalent K(1)O12 cuboctahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to four equivalent K(1) and one Nb(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to four equivalent K(1) and one Nb(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to four equivalent K(1) and one Nb(1) atom.
K2NbO6 crystallizes in the orthorhombic Imm2 space group. K(1) is bonded to four equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms to form KO12 cuboctahedra that share corners with twelve equivalent K(1)O12 cuboctahedra, faces with six equivalent K(1)O12 cuboctahedra, and faces with four equivalent Nb(1)O6 octahedra. There are two shorter (3.01 Å) and two longer (3.06 Å) K(1)-O(1) bond lengths. There are a spread of K(1)-O(2) bond distances ranging from 2.96-3.14 Å. There are two shorter (3.00 Å) and two longer (3.07 Å) K(1)-O(3) bond lengths. Nb(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form NbO6 octahedra that share faces with eight equivalent K(1)O12 cuboctahedra. Both Nb(1)-O(1) bond lengths are 1.93 Å. Both Nb(1)-O(2) bond lengths are 1.98 Å. Both Nb(1)-O(3) bond lengths are 2.03 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to four equivalent K(1) and one Nb(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to four equivalent K(1) and one Nb(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to four equivalent K(1) and one Nb(1) atom.