KNaSO4 crystallizes in the trigonal P-3m1 space group. K(1) is bonded in a 10-coordinate geometry to one O(2) and nine equivalent O(1) atoms. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to six equivalent O(1) atoms to form NaO6 octahedra that share corners with six equivalent S(1)O4 tetrahedra. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to six equivalent O(1) atoms. S(1) is bonded to one O(2) and three equivalent O(1) atoms to form SO4 tetrahedra that share corners with three equivalent Na(1)O6 octahedra. The corner-sharing octahedral tilt angles are 19°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to three equivalent K(1), one Na(1), one Na(2), and one S(1) atom. In the second O site, O(2) is bonded in a linear geometry to one K(1) and one S(1) atom.
KNaSO4 crystallizes in the trigonal P-3m1 space group. K(1) is bonded in a 10-coordinate geometry to one O(2) and nine equivalent O(1) atoms. The K(1)-O(2) bond length is 2.54 Å. There are six shorter (2.87 Å) and three longer (3.07 Å) K(1)-O(1) bond lengths. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to six equivalent O(1) atoms to form NaO6 octahedra that share corners with six equivalent S(1)O4 tetrahedra. All Na(1)-O(1) bond lengths are 2.42 Å. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to six equivalent O(1) atoms. All Na(2)-O(1) bond lengths are 2.81 Å. S(1) is bonded to one O(2) and three equivalent O(1) atoms to form SO4 tetrahedra that share corners with three equivalent Na(1)O6 octahedra. The corner-sharing octahedral tilt angles are 19°. The S(1)-O(2) bond length is 1.46 Å. All S(1)-O(1) bond lengths are 1.51 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to three equivalent K(1), one Na(1), one Na(2), and one S(1) atom. In the second O site, O(2) is bonded in a linear geometry to one K(1) and one S(1) atom.