Na2Sb3O8 crystallizes in the cubic P4_332 space group. Na(1) is bonded to one O(2) and three equivalent O(1) atoms to form NaO4 tetrahedra that share corners with nine equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-60°. Sb(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form SbO6 octahedra that share corners with six equivalent Na(1)O4 tetrahedra and edges with four equivalent Sb(1)O6 octahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Na(1) and two equivalent Sb(1) atoms. In the second O site, O(2) is bonded to one Na(1) and three equivalent Sb(1) atoms to form distorted corner-sharing ONaSb3 tetrahedra.
Na2Sb3O8 crystallizes in the cubic P4_332 space group. Na(1) is bonded to one O(2) and three equivalent O(1) atoms to form NaO4 tetrahedra that share corners with nine equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-60°. The Na(1)-O(2) bond length is 2.33 Å. All Na(1)-O(1) bond lengths are 2.32 Å. Sb(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form SbO6 octahedra that share corners with six equivalent Na(1)O4 tetrahedra and edges with four equivalent Sb(1)O6 octahedra. Both Sb(1)-O(2) bond lengths are 2.17 Å. There are two shorter (2.01 Å) and two longer (2.06 Å) Sb(1)-O(1) bond lengths. There are two inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Na(1) and two equivalent Sb(1) atoms. In the second O site, O(2) is bonded to one Na(1) and three equivalent Sb(1) atoms to form distorted corner-sharing ONaSb3 tetrahedra.