Na2SO4 crystallizes in the triclinic P1 space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a bent 120 degrees geometry to one O(1) and one O(7) atom. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to one O(2), one O(5), one O(7), and one O(8) atom. In the third Na site, Na(3) is bonded in a trigonal planar geometry to one O(3), one O(6), and one O(7) atom. In the fourth Na site, Na(4) is bonded in a distorted see-saw-like geometry to one O(2), one O(4), one O(6), and one O(7) atom. There are two inequivalent S sites. In the first S site, S(1) is bonded to one O(1), one O(2), one O(3), and one O(8) atom to form corner-sharing SO4 tetrahedra. In the second S site, S(2) is bonded to one O(4), one O(5), one O(6), and one O(8) atom to form corner-sharing SO4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Na(1) and one S(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Na(2), one Na(4), and one S(1) atom. In the third O site, O(3) is bonded in a distorted water-like geometry to one Na(3) and one S(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Na(4) and one S(2) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Na(2) and one S(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Na(3), one Na(4), and one S(2) atom. In the seventh O site, O(7) is bonded in a rectangular see-saw-like geometry to one Na(1), one Na(2), one Na(3), and one Na(4) atom. In the eighth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one Na(2), one S(1), and one S(2) atom.
Na2SO4 crystallizes in the triclinic P1 space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a bent 120 degrees geometry to one O(1) and one O(7) atom. The Na(1)-O(1) bond length is 2.39 Å. The Na(1)-O(7) bond length is 2.25 Å. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to one O(2), one O(5), one O(7), and one O(8) atom. The Na(2)-O(2) bond length is 2.50 Å. The Na(2)-O(5) bond length is 2.30 Å. The Na(2)-O(7) bond length is 2.20 Å. The Na(2)-O(8) bond length is 2.63 Å. In the third Na site, Na(3) is bonded in a trigonal planar geometry to one O(3), one O(6), and one O(7) atom. The Na(3)-O(3) bond length is 2.36 Å. The Na(3)-O(6) bond length is 2.35 Å. The Na(3)-O(7) bond length is 2.21 Å. In the fourth Na site, Na(4) is bonded in a distorted see-saw-like geometry to one O(2), one O(4), one O(6), and one O(7) atom. The Na(4)-O(2) bond length is 2.41 Å. The Na(4)-O(4) bond length is 2.36 Å. The Na(4)-O(6) bond length is 2.41 Å. The Na(4)-O(7) bond length is 2.24 Å. There are two inequivalent S sites. In the first S site, S(1) is bonded to one O(1), one O(2), one O(3), and one O(8) atom to form corner-sharing SO4 tetrahedra. The S(1)-O(1) bond length is 1.46 Å. The S(1)-O(2) bond length is 1.46 Å. The S(1)-O(3) bond length is 1.45 Å. The S(1)-O(8) bond length is 1.69 Å. In the second S site, S(2) is bonded to one O(4), one O(5), one O(6), and one O(8) atom to form corner-sharing SO4 tetrahedra. The S(2)-O(4) bond length is 1.44 Å. The S(2)-O(5) bond length is 1.46 Å. The S(2)-O(6) bond length is 1.47 Å. The S(2)-O(8) bond length is 1.68 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Na(1) and one S(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Na(2), one Na(4), and one S(1) atom. In the third O site, O(3) is bonded in a distorted water-like geometry to one Na(3) and one S(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Na(4) and one S(2) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Na(2) and one S(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Na(3), one Na(4), and one S(2) atom. In the seventh O site, O(7) is bonded in a rectangular see-saw-like geometry to one Na(1), one Na(2), one Na(3), and one Na(4) atom. In the eighth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one Na(2), one S(1), and one S(2) atom.