Na4TeO5 crystallizes in the triclinic P-1 space group. There are five inequivalent Na sites. In the first Na site, Na(1) is bonded in a 1-coordinate geometry to one Na(5), one O(2), one O(3), and two equivalent O(4) atoms. In the second Na site, Na(2) is bonded in a 3-coordinate geometry to one Na(4), one O(1), one O(2), one O(4), and one O(5) atom. In the third Na site, Na(3) is bonded in a 3-coordinate geometry to one Na(4), one O(3), one O(4), and two equivalent O(2) atoms. In the fourth Na site, Na(4) is bonded in a 10-coordinate geometry to two equivalent Na(2), two equivalent Na(3), two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms. In the fifth Na site, Na(5) is bonded in a 12-coordinate geometry to two equivalent Na(1), two equivalent Te(1), two equivalent O(1), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. Te(1) is bonded in a 2-coordinate geometry to one Na(5), one O(2), one O(5), and two equivalent O(4) atoms. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 1-coordinate geometry to one Na(2), one Na(4), and one Na(5) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Na(4), two equivalent Na(3), and one Te(1) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one Na(1), one Na(3), and one Na(5) atom. In the fourth O site, O(4) is bonded in a 7-coordinate geometry to one Na(2), one Na(3), one Na(5), two equivalent Na(1), and two equivalent Te(1) atoms. In the fifth O site, O(5) is bonded in a 1-coordinate geometry to one Na(2), one Na(4), one Na(5), and one Te(1) atom.
Na4TeO5 crystallizes in the triclinic P-1 space group. There are five inequivalent Na sites. In the first Na site, Na(1) is bonded in a 1-coordinate geometry to one Na(5), one O(2), one O(3), and two equivalent O(4) atoms. The Na(1)-Na(5) bond length is 2.57 Å. The Na(1)-O(2) bond length is 2.48 Å. The Na(1)-O(3) bond length is 2.09 Å. There is one shorter (2.54 Å) and one longer (2.84 Å) Na(1)-O(4) bond length. In the second Na site, Na(2) is bonded in a 3-coordinate geometry to one Na(4), one O(1), one O(2), one O(4), and one O(5) atom. The Na(2)-Na(4) bond length is 2.51 Å. The Na(2)-O(1) bond length is 2.10 Å. The Na(2)-O(2) bond length is 2.25 Å. The Na(2)-O(4) bond length is 2.73 Å. The Na(2)-O(5) bond length is 2.44 Å. In the third Na site, Na(3) is bonded in a 3-coordinate geometry to one Na(4), one O(3), one O(4), and two equivalent O(2) atoms. The Na(3)-Na(4) bond length is 2.68 Å. The Na(3)-O(3) bond length is 2.54 Å. The Na(3)-O(4) bond length is 2.87 Å. There is one shorter (2.35 Å) and one longer (2.52 Å) Na(3)-O(2) bond length. In the fourth Na site, Na(4) is bonded in a 10-coordinate geometry to two equivalent Na(2), two equivalent Na(3), two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms. Both Na(4)-O(1) bond lengths are 2.80 Å. Both Na(4)-O(2) bond lengths are 2.99 Å. Both Na(4)-O(5) bond lengths are 2.77 Å. In the fifth Na site, Na(5) is bonded in a 12-coordinate geometry to two equivalent Na(1), two equivalent Te(1), two equivalent O(1), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. Both Na(5)-Te(1) bond lengths are 2.63 Å. Both Na(5)-O(1) bond lengths are 2.47 Å. Both Na(5)-O(3) bond lengths are 2.79 Å. Both Na(5)-O(4) bond lengths are 2.59 Å. Both Na(5)-O(5) bond lengths are 2.52 Å. Te(1) is bonded in a 2-coordinate geometry to one Na(5), one O(2), one O(5), and two equivalent O(4) atoms. The Te(1)-O(2) bond length is 2.44 Å. The Te(1)-O(5) bond length is 1.83 Å. There is one shorter (2.07 Å) and one longer (2.69 Å) Te(1)-O(4) bond length. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 1-coordinate geometry to one Na(2), one Na(4), and one Na(5) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Na(4), two equivalent Na(3), and one Te(1) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one Na(1), one Na(3), and one Na(5) atom. In the fourth O site, O(4) is bonded in a 7-coordinate geometry to one Na(2), one Na(3), one Na(5), two equivalent Na(1), and two equivalent Te(1) atoms. In the fifth O site, O(5) is bonded in a 1-coordinate geometry to one Na(2), one Na(4), one Na(5), and one Te(1) atom.