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 Na(6)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, edges with two equivalent Na(7)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 15-20°. 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(5)O6 octahedra,  an edgeedge with one Na(7)O6 octahedra, edges with two equivalent Na(6)O6 octahedra, edges with two equivalent Na(8)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 9-18°. In the third Na site, Na(3) is bonded to one O(11), one O(2), one O(3), 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(5)O6 octahedra,  a cornercorner with one Na(6)O6 octahedra,  a cornercorner with one Na(7)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 Co(3)O6 octahedra,  an edgeedge with one Co(4)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, edges with two equivalent Na(8)O6 octahedra, edges with two equivalent Co(1)O6 octahedra, and edges with two equivalent Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 16-19°. In the fourth Na site, Na(4) is bonded to one O(1), one O(10), one O(12), one O(4), 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(5)O6 octahedra,  a cornercorner with one Na(6)O6 octahedra,  a cornercorner with one Na(7)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 Co(1)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra, edges with two equivalent Na(6)O6 octahedra, edges with two equivalent Na(7)O6 octahedra, edges with two equivalent Co(3)O6 octahedra, and edges with two equivalent Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 17-22°. In the fifth Na site, Na(5) is bonded to one O(11), one O(2), one O(3), one O(5), one O(8), 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(2)O6 octahedra,  an edgeedge with one Na(7)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Na(8)O6 octahedra, and edges with two equivalent Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 10-22°. In the sixth Na site, Na(6) is bonded to one O(1), one O(10), one O(12), one O(4), one O(6), and one O(7) 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(1)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Na(7)O6 octahedra, and edges with two equivalent Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-19°. In the seventh Na site, Na(7) is bonded to one O(1), one O(12), one O(4), 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(2)O6 octahedra,  an edgeedge with one Na(5)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra,  an edgeedge with one Co(4)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Na(6)O6 octahedra, and edges with two equivalent Co(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 10-21°. In the eighth Na site, Na(8) is bonded to one O(10), one O(11), one O(2), one O(3), 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(1)O6 octahedra,  an edgeedge with one Na(6)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra,  an edgeedge with one Co(4)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, and edges with two equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 10-21°. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(10), one O(11), one O(2), one O(4), one O(6), and one O(8) 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(5)O6 octahedra,  a cornercorner with one Na(6)O6 octahedra,  a cornercorner with one Na(7)O6 octahedra,  a cornercorner with one Na(8)O6 octahedra,  an edgeedge with one Na(4)O6 octahedra,  an edgeedge with one Na(5)O6 octahedra,  an edgeedge with one Na(6)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Na(8)O6 octahedra, and edges with two equivalent Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-18°. In the second Co site, Co(2) is bonded to one O(1), one O(11), one O(3), one O(5), one O(8), and one O(9) 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(5)O6 octahedra,  a cornercorner with one Na(6)O6 octahedra,  a cornercorner with one Na(7)O6 octahedra,  a cornercorner with one Na(8)O6 octahedra,  an edgeedge with one Na(4)O6 octahedra,  an edgeedge with one Na(7)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, and edges with two equivalent Co(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 14-20°. In the third Co site, Co(3) is bonded to one O(1), one O(12), one O(3), one O(5), one O(7), and one O(9) 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(5)O6 octahedra,  a cornercorner with one Na(6)O6 octahedra,  a cornercorner with one Na(7)O6 octahedra,  a cornercorner with one Na(8)O6 octahedra,  an edgeedge with one Na(3)O6 octahedra,  an edgeedge with one Na(5)O6 octahedra,  an edgeedge with one Na(6)O6 octahedra,  an edgeedge with one Co(4)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Na(7)O6 octahedra, and edges with two equivalent Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-16°. In the fourth Co site, Co(4) is bonded to one O(10), one O(12), one O(2), one O(4), 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(5)O6 octahedra,  a cornercorner with one Na(6)O6 octahedra,  a cornercorner with one Na(7)O6 octahedra,  a cornercorner with one Na(8)O6 octahedra,  an edgeedge with one Na(3)O6 octahedra,  an edgeedge with one Na(7)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Na(6)O6 octahedra, and edges with two equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 15-21°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), one Na(4), one Na(6), one Na(7), one Co(2), and one Co(3) atom to form a mixture of distorted edge and corner-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 2-13°. In the second O site, O(2) is bonded to one Na(2), one Na(3), one Na(5), one Na(8), one Co(1), and one Co(4) atom to form a mixture of distorted edge and corner-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 2-18°. In the third O site, O(3) is bonded to one Na(1), one Na(3), one Na(5), one Na(8), one Co(2), and one Co(3) atom to form a mixture of distorted edge and corner-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 2-16°. In the fourth O site, O(4) is bonded to one Na(2), one Na(4), one Na(6), one Na(7), one Co(1), and one Co(4) atom to form a mixture of distorted edge and corner-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 2-14°. In the fifth O site, O(5) is bonded to one Na(1), one Na(4), one Na(5), one Na(7), one Co(2), and one Co(3) atom to form a mixture of distorted edge and corner-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 1-16°. In the sixth O site, O(6) is bonded to one Na(2), one Na(3), one Na(6), one Na(8), one Co(1), and one Co(4) atom to form a mixture of distorted edge and corner-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 4-14°. 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 edge and corner-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 1-18°. 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 distorted edge and corner-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 2-14°. In the ninth O site, O(9) is bonded to one Na(1), one Na(3), one Na(5), one Na(7), one Co(2), and one Co(3) atom to form a mixture of distorted edge and corner-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 1-16°. In the tenth O site, O(10) is bonded to one Na(2), one Na(4), one Na(6), one Na(8), one Co(1), and one Co(4) atom to form a mixture of distorted edge and corner-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 3-14°. In the eleventh O site, O(11) is bonded to one Na(1), one Na(3), one Na(5), one Na(8), one Co(1), and one Co(2) atom to form a mixture of distorted edge and corner-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 1-14°. In the twelfth O site, O(12) is bonded to one Na(2), one Na(4), one Na(6), one Na(7), one Co(3), and one Co(4) atom to form a mixture of distorted edge and corner-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 4-16°.
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 Na(6)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, edges with two equivalent Na(7)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 15-20°. The Na(1)-O(1) bond length is 2.25 Å. The Na(1)-O(11) bond length is 2.49 Å. The Na(1)-O(3) bond length is 2.25 Å. The Na(1)-O(5) bond length is 2.58 Å. The Na(1)-O(7) bond length is 2.44 Å. The Na(1)-O(9) bond length is 2.43 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(5)O6 octahedra,  an edgeedge with one Na(7)O6 octahedra, edges with two equivalent Na(6)O6 octahedra, edges with two equivalent Na(8)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 9-18°. The Na(2)-O(10) bond length is 2.44 Å. The Na(2)-O(12) bond length is 2.60 Å. The Na(2)-O(2) bond length is 2.23 Å. The Na(2)-O(4) bond length is 2.23 Å. The Na(2)-O(6) bond length is 2.55 Å. The Na(2)-O(8) bond length is 2.51 Å. In the third Na site, Na(3) is bonded to one O(11), one O(2), one O(3), 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(5)O6 octahedra,  a cornercorner with one Na(6)O6 octahedra,  a cornercorner with one Na(7)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 Co(3)O6 octahedra,  an edgeedge with one Co(4)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, edges with two equivalent Na(8)O6 octahedra, edges with two equivalent Co(1)O6 octahedra, and edges with two equivalent Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 16-19°. The Na(3)-O(11) bond length is 2.32 Å. The Na(3)-O(2) bond length is 2.28 Å. The Na(3)-O(3) bond length is 2.31 Å. The Na(3)-O(6) bond length is 2.24 Å. The Na(3)-O(8) bond length is 2.33 Å. The Na(3)-O(9) bond length is 2.25 Å. In the fourth Na site, Na(4) is bonded to one O(1), one O(10), one O(12), one O(4), 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(5)O6 octahedra,  a cornercorner with one Na(6)O6 octahedra,  a cornercorner with one Na(7)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 Co(1)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra, edges with two equivalent Na(6)O6 octahedra, edges with two equivalent Na(7)O6 octahedra, edges with two equivalent Co(3)O6 octahedra, and edges with two equivalent Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 17-22°. The Na(4)-O(1) bond length is 2.30 Å. The Na(4)-O(10) bond length is 2.27 Å. The Na(4)-O(12) bond length is 2.34 Å. The Na(4)-O(4) bond length is 2.30 Å. The Na(4)-O(5) bond length is 2.27 Å. The Na(4)-O(7) bond length is 2.32 Å. In the fifth Na site, Na(5) is bonded to one O(11), one O(2), one O(3), one O(5), one O(8), 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(2)O6 octahedra,  an edgeedge with one Na(7)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Na(8)O6 octahedra, and edges with two equivalent Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 10-22°. The Na(5)-O(11) bond length is 2.26 Å. The Na(5)-O(2) bond length is 2.38 Å. The Na(5)-O(3) bond length is 2.41 Å. The Na(5)-O(5) bond length is 2.27 Å. The Na(5)-O(8) bond length is 2.55 Å. The Na(5)-O(9) bond length is 2.53 Å. In the sixth Na site, Na(6) is bonded to one O(1), one O(10), one O(12), one O(4), one O(6), and one O(7) 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(1)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Na(7)O6 octahedra, and edges with two equivalent Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-19°. The Na(6)-O(1) bond length is 2.45 Å. The Na(6)-O(10) bond length is 2.59 Å. The Na(6)-O(12) bond length is 2.28 Å. The Na(6)-O(4) bond length is 2.38 Å. The Na(6)-O(6) bond length is 2.23 Å. The Na(6)-O(7) bond length is 2.58 Å. In the seventh Na site, Na(7) is bonded to one O(1), one O(12), one O(4), 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(2)O6 octahedra,  an edgeedge with one Na(5)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra,  an edgeedge with one Co(4)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Na(6)O6 octahedra, and edges with two equivalent Co(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 10-21°. The Na(7)-O(1) bond length is 2.50 Å. The Na(7)-O(12) bond length is 2.44 Å. The Na(7)-O(4) bond length is 2.43 Å. The Na(7)-O(5) bond length is 2.57 Å. The Na(7)-O(7) bond length is 2.26 Å. The Na(7)-O(9) bond length is 2.26 Å. In the eighth Na site, Na(8) is bonded to one O(10), one O(11), one O(2), one O(3), 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(1)O6 octahedra,  an edgeedge with one Na(6)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra,  an edgeedge with one Co(4)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, and edges with two equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 10-21°. The Na(8)-O(10) bond length is 2.25 Å. The Na(8)-O(11) bond length is 2.60 Å. The Na(8)-O(2) bond length is 2.48 Å. The Na(8)-O(3) bond length is 2.49 Å. The Na(8)-O(6) bond length is 2.41 Å. The Na(8)-O(8) bond length is 2.28 Å. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(10), one O(11), one O(2), one O(4), one O(6), and one O(8) 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(5)O6 octahedra,  a cornercorner with one Na(6)O6 octahedra,  a cornercorner with one Na(7)O6 octahedra,  a cornercorner with one Na(8)O6 octahedra,  an edgeedge with one Na(4)O6 octahedra,  an edgeedge with one Na(5)O6 octahedra,  an edgeedge with one Na(6)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Na(8)O6 octahedra, and edges with two equivalent Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-18°. The Co(1)-O(10) bond length is 1.86 Å. The Co(1)-O(11) bond length is 1.99 Å. The Co(1)-O(2) bond length is 2.02 Å. The Co(1)-O(4) bond length is 1.86 Å. The Co(1)-O(6) bond length is 1.96 Å. The Co(1)-O(8) bond length is 2.00 Å. In the second Co site, Co(2) is bonded to one O(1), one O(11), one O(3), one O(5), one O(8), and one O(9) 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(5)O6 octahedra,  a cornercorner with one Na(6)O6 octahedra,  a cornercorner with one Na(7)O6 octahedra,  a cornercorner with one Na(8)O6 octahedra,  an edgeedge with one Na(4)O6 octahedra,  an edgeedge with one Na(7)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, and edges with two equivalent Co(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 14-20°. The Co(2)-O(1) bond length is 1.92 Å. The Co(2)-O(11) bond length is 1.91 Å. The Co(2)-O(3) bond length is 2.18 Å. The Co(2)-O(5) bond length is 1.97 Å. The Co(2)-O(8) bond length is 1.88 Å. The Co(2)-O(9) bond length is 2.05 Å. In the third Co site, Co(3) is bonded to one O(1), one O(12), one O(3), one O(5), one O(7), and one O(9) 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(5)O6 octahedra,  a cornercorner with one Na(6)O6 octahedra,  a cornercorner with one Na(7)O6 octahedra,  a cornercorner with one Na(8)O6 octahedra,  an edgeedge with one Na(3)O6 octahedra,  an edgeedge with one Na(5)O6 octahedra,  an edgeedge with one Na(6)O6 octahedra,  an edgeedge with one Co(4)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Na(7)O6 octahedra, and edges with two equivalent Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-16°. The Co(3)-O(1) bond length is 2.05 Å. The Co(3)-O(12) bond length is 1.82 Å. The Co(3)-O(3) bond length is 1.83 Å. The Co(3)-O(5) bond length is 1.94 Å. The Co(3)-O(7) bond length is 2.00 Å. The Co(3)-O(9) bond length is 1.91 Å. In the fourth Co site, Co(4) is bonded to one O(10), one O(12), one O(2), one O(4), 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(5)O6 octahedra,  a cornercorner with one Na(6)O6 octahedra,  a cornercorner with one Na(7)O6 octahedra,  a cornercorner with one Na(8)O6 octahedra,  an edgeedge with one Na(3)O6 octahedra,  an edgeedge with one Na(7)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Na(6)O6 octahedra, and edges with two equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 15-21°. The Co(4)-O(10) bond length is 2.07 Å. The Co(4)-O(12) bond length is 2.22 Å. The Co(4)-O(2) bond length is 1.97 Å. The Co(4)-O(4) bond length is 2.14 Å. The Co(4)-O(6) bond length is 1.99 Å. The Co(4)-O(7) bond length is 1.97 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), one Na(4), one Na(6), one Na(7), one Co(2), and one Co(3) atom to form a mixture of distorted edge and corner-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 2-13°. In the second O site, O(2) is bonded to one Na(2), one Na(3), one Na(5), one Na(8), one Co(1), and one Co(4) atom to form a mixture of distorted edge and corner-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 2-18°. In the third O site, O(3) is bonded to one Na(1), one Na(3), one Na(5), one Na(8), one Co(2), and one Co(3) atom to form a mixture of distorted edge and corner-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 2-16°. In the fourth O site, O(4) is bonded to one Na(2), one Na(4), one Na(6), one Na(7), one Co(1), and one Co(4) atom to form a mixture of distorted edge and corner-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 2-14°. In the fifth O site, O(5) is bonded to one Na(1), one Na(4), one Na(5), one Na(7), one Co(2), and one Co(3) atom to form a mixture of distorted edge and corner-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 1-16°. In the sixth O site, O(6) is bonded to one Na(2), one Na(3), one Na(6), one Na(8), one Co(1), and one Co(4) atom to form a mixture of distorted edge and corner-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 4-14°. 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 edge and corner-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 1-18°. 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 distorted edge and corner-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 2-14°. In the ninth O site, O(9) is bonded to one Na(1), one Na(3), one Na(5), one Na(7), one Co(2), and one Co(3) atom to form a mixture of distorted edge and corner-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 1-16°. In the tenth O site, O(10) is bonded to one Na(2), one Na(4), one Na(6), one Na(8), one Co(1), and one Co(4) atom to form a mixture of distorted edge and corner-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 3-14°. In the eleventh O site, O(11) is bonded to one Na(1), one Na(3), one Na(5), one Na(8), one Co(1), and one Co(2) atom to form a mixture of distorted edge and corner-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 1-14°. In the twelfth O site, O(12) is bonded to one Na(2), one Na(4), one Na(6), one Na(7), one Co(3), and one Co(4) atom to form a mixture of distorted edge and corner-sharing ONa4Co2 octahedra. The corner-sharing octahedral tilt angles range from 4-16°.