Na2CoO3 is High Pressure (4-7GPa) Tellurium-derived structured and crystallizes in the triclinic P1 space group. There are eight inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(1), one O(11), one O(3), one O(5), one O(7), and one O(9) atom to form distorted NaO6 octahedra that share  a cornercorner with one Na(3)O6 octahedra,  a cornercorner with one Na(4)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra,  an edgeedge with one Na(3)O6 octahedra,  an edgeedge with one Na(4)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra,  an edgeedge with one Co(4)O6 octahedra, and edges with two equivalent Na(8)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-20°. In the second Na site, Na(2) is bonded to one O(10), one O(12), one O(2), one O(4), one O(6), and one O(8) atom to form distorted NaO6 octahedra that share  a cornercorner with one Na(3)O6 octahedra,  a cornercorner with one Na(4)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra,  an edgeedge with one Na(3)O6 octahedra,  an edgeedge with one Na(4)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra, and  an edgeedge with one Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 3-19°. In the third Na site, Na(3) is bonded to one O(1), one O(11), one O(4), one O(6), one O(8), and one O(9) atom to form NaO6 octahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Na(8)O6 octahedra,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Na(2)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra, edges with two equivalent Co(1)O6 octahedra, and edges with two equivalent Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 14-20°. In the fourth Na site, Na(4) is bonded to one O(10), one O(12), one O(2), one O(3), one O(5), and one O(7) atom to form NaO6 octahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Na(8)O6 octahedra,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Na(2)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra,  an edgeedge with one Co(4)O6 octahedra, edges with two equivalent Co(2)O6 octahedra, and edges with two equivalent Co(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 18-19°. In the fifth Na site, Na(5) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(2), one O(4), one O(5), and one O(8) atom. In the sixth Na site, Na(6) is bonded in a 6-coordinate geometry to one O(1), one O(12), one O(3), one O(6), one O(7), and one O(9) atom. In the seventh Na site, Na(7) is bonded in a 6-coordinate geometry to one O(12), one O(2), one O(4), one O(6), one O(7), and one O(9) atom. In the eighth Na site, Na(8) is bonded to one O(1), one O(10), one O(11), one O(3), one O(5), and one O(8) atom to form distorted NaO6 octahedra that share  a cornercorner with one Na(3)O6 octahedra,  a cornercorner with one Na(4)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra,  an edgeedge with one Na(2)O6 octahedra,  an edgeedge with one Na(3)O6 octahedra,  an edgeedge with one Na(4)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra,  an edgeedge with one Co(4)O6 octahedra, and edges with two equivalent Na(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 7-20°. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(12), one O(4), one O(5), one O(8), and one O(9) atom to form distorted CoO6 octahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Na(8)O6 octahedra,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Na(2)O6 octahedra,  an edgeedge with one Na(4)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra,  an edgeedge with one Co(4)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, and edges with two equivalent Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 3-15°. In the second Co site, Co(2) is bonded to one O(12), one O(2), one O(3), one O(5), one O(8), and one O(9) atom to form distorted CoO6 octahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Na(8)O6 octahedra,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Na(2)O6 octahedra,  an edgeedge with one Na(3)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, and edges with two equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-20°. In the third Co site, Co(3) is bonded to one O(10), one O(11), one O(2), one O(3), one O(6), and one O(7) atom to form distorted CoO6 octahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Na(8)O6 octahedra,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Na(2)O6 octahedra,  an edgeedge with one Na(3)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, and edges with two equivalent Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 16-20°. In the fourth Co site, Co(4) is bonded to one O(1), one O(10), one O(11), one O(4), one O(6), and one O(7) atom to form CoO6 octahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Na(8)O6 octahedra,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Na(2)O6 octahedra,  an edgeedge with one Na(4)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, and edges with two equivalent Co(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 7-17°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), one Na(3), one Na(6), one Na(8), one Co(1), and one Co(4) atom to form a mixture of distorted corner and edge-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 2-14°. In the second O site, O(2) is bonded to one Na(2), one Na(4), one Na(5), one Na(7), one Co(2), and one Co(3) atom to form a mixture of distorted corner and edge-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 2-12°. In the third O site, O(3) is bonded to one Na(1), one Na(4), one Na(6), one Na(8), one Co(2), and one Co(3) atom to form a mixture of distorted corner and edge-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 2-9°. In the fourth O site, O(4) is bonded to one Na(2), one Na(3), one Na(5), one Na(7), one Co(1), and one Co(4) atom to form a mixture of distorted corner and edge-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 2-16°. In the fifth O site, O(5) is bonded to one Na(1), one Na(4), one Na(5), one Na(8), one Co(1), and one Co(2) atom to form a mixture of distorted corner and edge-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 2-14°. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Na(2), one Na(3), one Na(6), one Na(7), one Co(3), and one Co(4) atom. In the seventh O site, O(7) is bonded to one Na(1), one Na(4), one Na(6), one Na(7), one Co(3), and one Co(4) atom to form a mixture of distorted corner and edge-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 5-12°. In the eighth O site, O(8) is bonded to one Na(2), one Na(3), one Na(5), one Na(8), one Co(1), and one Co(2) atom to form a mixture of corner and edge-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 1-12°. In the ninth O site, O(9) is bonded in a 6-coordinate geometry to one Na(1), one Na(3), one Na(6), one Na(7), one Co(1), and one Co(2) atom. In the tenth O site, O(10) is bonded to one Na(2), one Na(4), one Na(5), one Na(8), one Co(3), and one Co(4) atom to form a mixture of distorted corner and edge-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 8-16°. In the eleventh O site, O(11) is bonded in a 6-coordinate geometry to one Na(1), one Na(3), one Na(5), one Na(8), one Co(3), and one Co(4) atom. In the twelfth O site, O(12) is bonded to one Na(2), one Na(4), one Na(6), one Na(7), one Co(1), and one Co(2) atom to form a mixture of distorted corner and edge-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 1-13°.
Na2CoO3 is High Pressure (4-7GPa) Tellurium-derived structured and crystallizes in the triclinic P1 space group. There are eight inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(1), one O(11), one O(3), one O(5), one O(7), and one O(9) atom to form distorted NaO6 octahedra that share  a cornercorner with one Na(3)O6 octahedra,  a cornercorner with one Na(4)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra,  an edgeedge with one Na(3)O6 octahedra,  an edgeedge with one Na(4)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra,  an edgeedge with one Co(4)O6 octahedra, and edges with two equivalent Na(8)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-20°. The Na(1)-O(1) bond length is 2.29 Å. The Na(1)-O(11) bond length is 2.38 Å. The Na(1)-O(3) bond length is 2.27 Å. The Na(1)-O(5) bond length is 2.56 Å. The Na(1)-O(7) bond length is 2.53 Å. The Na(1)-O(9) bond length is 2.57 Å. In the second Na site, Na(2) is bonded to one O(10), one O(12), one O(2), one O(4), one O(6), and one O(8) atom to form distorted NaO6 octahedra that share  a cornercorner with one Na(3)O6 octahedra,  a cornercorner with one Na(4)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra,  an edgeedge with one Na(3)O6 octahedra,  an edgeedge with one Na(4)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra, and  an edgeedge with one Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 3-19°. The Na(2)-O(10) bond length is 2.45 Å. The Na(2)-O(12) bond length is 2.59 Å. The Na(2)-O(2) bond length is 2.25 Å. The Na(2)-O(4) bond length is 2.25 Å. The Na(2)-O(6) bond length is 2.49 Å. The Na(2)-O(8) bond length is 2.48 Å. In the third Na site, Na(3) is bonded to one O(1), one O(11), one O(4), one O(6), one O(8), and one O(9) atom to form NaO6 octahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Na(8)O6 octahedra,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Na(2)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra, edges with two equivalent Co(1)O6 octahedra, and edges with two equivalent Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 14-20°. The Na(3)-O(1) bond length is 2.34 Å. The Na(3)-O(11) bond length is 2.23 Å. The Na(3)-O(4) bond length is 2.34 Å. The Na(3)-O(6) bond length is 2.32 Å. The Na(3)-O(8) bond length is 2.20 Å. The Na(3)-O(9) bond length is 2.30 Å. In the fourth Na site, Na(4) is bonded to one O(10), one O(12), one O(2), one O(3), one O(5), and one O(7) atom to form NaO6 octahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Na(8)O6 octahedra,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Na(2)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra,  an edgeedge with one Co(4)O6 octahedra, edges with two equivalent Co(2)O6 octahedra, and edges with two equivalent Co(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 18-19°. The Na(4)-O(10) bond length is 2.31 Å. The Na(4)-O(12) bond length is 2.23 Å. The Na(4)-O(2) bond length is 2.34 Å. The Na(4)-O(3) bond length is 2.37 Å. The Na(4)-O(5) bond length is 2.30 Å. The Na(4)-O(7) bond length is 2.25 Å. In the fifth Na site, Na(5) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(2), one O(4), one O(5), and one O(8) atom. The Na(5)-O(10) bond length is 2.63 Å. The Na(5)-O(11) bond length is 2.23 Å. The Na(5)-O(2) bond length is 2.44 Å. The Na(5)-O(4) bond length is 2.40 Å. The Na(5)-O(5) bond length is 2.25 Å. The Na(5)-O(8) bond length is 2.39 Å. In the sixth Na site, Na(6) is bonded in a 6-coordinate geometry to one O(1), one O(12), one O(3), one O(6), one O(7), and one O(9) atom. The Na(6)-O(1) bond length is 2.47 Å. The Na(6)-O(12) bond length is 2.25 Å. The Na(6)-O(3) bond length is 2.46 Å. The Na(6)-O(6) bond length is 2.28 Å. The Na(6)-O(7) bond length is 2.59 Å. The Na(6)-O(9) bond length is 2.38 Å. In the seventh Na site, Na(7) is bonded in a 6-coordinate geometry to one O(12), one O(2), one O(4), one O(6), one O(7), and one O(9) atom. The Na(7)-O(12) bond length is 2.42 Å. The Na(7)-O(2) bond length is 2.43 Å. The Na(7)-O(4) bond length is 2.47 Å. The Na(7)-O(6) bond length is 2.65 Å. The Na(7)-O(7) bond length is 2.25 Å. The Na(7)-O(9) bond length is 2.25 Å. In the eighth Na site, Na(8) is bonded to one O(1), one O(10), one O(11), one O(3), one O(5), and one O(8) atom to form distorted NaO6 octahedra that share  a cornercorner with one Na(3)O6 octahedra,  a cornercorner with one Na(4)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra,  an edgeedge with one Na(2)O6 octahedra,  an edgeedge with one Na(3)O6 octahedra,  an edgeedge with one Na(4)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra,  an edgeedge with one Co(4)O6 octahedra, and edges with two equivalent Na(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 7-20°. The Na(8)-O(1) bond length is 2.43 Å. The Na(8)-O(10) bond length is 2.26 Å. The Na(8)-O(11) bond length is 2.63 Å. The Na(8)-O(3) bond length is 2.36 Å. The Na(8)-O(5) bond length is 2.43 Å. The Na(8)-O(8) bond length is 2.24 Å. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(12), one O(4), one O(5), one O(8), and one O(9) atom to form distorted CoO6 octahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Na(8)O6 octahedra,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Na(2)O6 octahedra,  an edgeedge with one Na(4)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra,  an edgeedge with one Co(4)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, and edges with two equivalent Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 3-15°. The Co(1)-O(1) bond length is 1.90 Å. The Co(1)-O(12) bond length is 1.89 Å. The Co(1)-O(4) bond length is 2.03 Å. The Co(1)-O(5) bond length is 1.78 Å. The Co(1)-O(8) bond length is 2.02 Å. The Co(1)-O(9) bond length is 2.46 Å. In the second Co site, Co(2) is bonded to one O(12), one O(2), one O(3), one O(5), one O(8), and one O(9) atom to form distorted CoO6 octahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Na(8)O6 octahedra,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Na(2)O6 octahedra,  an edgeedge with one Na(3)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, and edges with two equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-20°. The Co(2)-O(12) bond length is 2.08 Å. The Co(2)-O(2) bond length is 2.13 Å. The Co(2)-O(3) bond length is 1.83 Å. The Co(2)-O(5) bond length is 2.31 Å. The Co(2)-O(8) bond length is 1.95 Å. The Co(2)-O(9) bond length is 1.77 Å. In the third Co site, Co(3) is bonded to one O(10), one O(11), one O(2), one O(3), one O(6), and one O(7) atom to form distorted CoO6 octahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Na(8)O6 octahedra,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Na(2)O6 octahedra,  an edgeedge with one Na(3)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, and edges with two equivalent Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 16-20°. The Co(3)-O(10) bond length is 1.98 Å. The Co(3)-O(11) bond length is 2.16 Å. The Co(3)-O(2) bond length is 1.86 Å. The Co(3)-O(3) bond length is 2.19 Å. The Co(3)-O(6) bond length is 1.88 Å. The Co(3)-O(7) bond length is 1.97 Å. In the fourth Co site, Co(4) is bonded to one O(1), one O(10), one O(11), one O(4), one O(6), and one O(7) atom to form CoO6 octahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Na(8)O6 octahedra,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Na(2)O6 octahedra,  an edgeedge with one Na(4)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, and edges with two equivalent Co(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 7-17°. The Co(4)-O(1) bond length is 2.01 Å. The Co(4)-O(10) bond length is 1.95 Å. The Co(4)-O(11) bond length is 1.84 Å. The Co(4)-O(4) bond length is 1.87 Å. The Co(4)-O(6) bond length is 2.04 Å. The Co(4)-O(7) bond length is 1.98 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), one Na(3), one Na(6), one Na(8), one Co(1), and one Co(4) atom to form a mixture of distorted corner and edge-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 2-14°. In the second O site, O(2) is bonded to one Na(2), one Na(4), one Na(5), one Na(7), one Co(2), and one Co(3) atom to form a mixture of distorted corner and edge-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 2-12°. In the third O site, O(3) is bonded to one Na(1), one Na(4), one Na(6), one Na(8), one Co(2), and one Co(3) atom to form a mixture of distorted corner and edge-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 2-9°. In the fourth O site, O(4) is bonded to one Na(2), one Na(3), one Na(5), one Na(7), one Co(1), and one Co(4) atom to form a mixture of distorted corner and edge-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 2-16°. In the fifth O site, O(5) is bonded to one Na(1), one Na(4), one Na(5), one Na(8), one Co(1), and one Co(2) atom to form a mixture of distorted corner and edge-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 2-14°. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Na(2), one Na(3), one Na(6), one Na(7), one Co(3), and one Co(4) atom. In the seventh O site, O(7) is bonded to one Na(1), one Na(4), one Na(6), one Na(7), one Co(3), and one Co(4) atom to form a mixture of distorted corner and edge-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 5-12°. In the eighth O site, O(8) is bonded to one Na(2), one Na(3), one Na(5), one Na(8), one Co(1), and one Co(2) atom to form a mixture of corner and edge-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 1-12°. In the ninth O site, O(9) is bonded in a 6-coordinate geometry to one Na(1), one Na(3), one Na(6), one Na(7), one Co(1), and one Co(2) atom. In the tenth O site, O(10) is bonded to one Na(2), one Na(4), one Na(5), one Na(8), one Co(3), and one Co(4) atom to form a mixture of distorted corner and edge-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 8-16°. In the eleventh O site, O(11) is bonded in a 6-coordinate geometry to one Na(1), one Na(3), one Na(5), one Na(8), one Co(3), and one Co(4) atom. In the twelfth O site, O(12) is bonded to one Na(2), one Na(4), one Na(6), one Na(7), one Co(1), and one Co(2) atom to form a mixture of distorted corner and edge-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 1-13°.