Na2SO4 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(2) atoms. In the second Na site, Na(2) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form NaO6 octahedra that share corners with six equivalent S(1)O4 tetrahedra and edges with two equivalent Na(2)O6 octahedra. S(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form SO4 tetrahedra that share corners with six equivalent Na(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-50°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Na(1), one Na(2), and one S(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Na(1), two equivalent Na(2), and one S(1) atom.
Na2SO4 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(2) atoms. Both Na(1)-O(1) bond lengths are 2.31 Å. There are two shorter (2.45 Å) and two longer (2.78 Å) Na(1)-O(2) bond lengths. In the second Na site, Na(2) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form NaO6 octahedra that share corners with six equivalent S(1)O4 tetrahedra and edges with two equivalent Na(2)O6 octahedra. Both Na(2)-O(1) bond lengths are 2.30 Å. All Na(2)-O(2) bond lengths are 2.38 Å. S(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form SO4 tetrahedra that share corners with six equivalent Na(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-50°. Both S(1)-O(1) bond lengths are 1.47 Å. Both S(1)-O(2) bond lengths are 1.49 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Na(1), one Na(2), and one S(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Na(1), two equivalent Na(2), and one S(1) atom.