NaCoO2 is Caswellsilverite-like structured and crystallizes in the triclinic P1 space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(5), one O(6), two equivalent O(3), and two equivalent O(8) atoms to form distorted NaO6 octahedra that share corners with two equivalent Na(2)O6 octahedra, corners with two equivalent Co(1)O6 octahedra, corners with two equivalent Co(3)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(4)O6 octahedra, edges with two equivalent Co(2)O6 octahedra, and edges with two equivalent Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 6-20°. In the second Na site, Na(2) is bonded to one O(5), one O(6), two equivalent O(4), and two equivalent O(7) atoms to form distorted NaO6 octahedra that share corners with two equivalent Na(1)O6 octahedra, corners with two equivalent Co(1)O6 octahedra, corners with two equivalent Co(3)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(3)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Co(2)O6 octahedra, and edges with two equivalent Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 6-20°. In the third Na site, Na(3) is bonded to one O(7), one O(8), two equivalent O(1), and two equivalent O(6) atoms to form distorted NaO6 octahedra that share corners with two equivalent Na(4)O6 octahedra, corners with two equivalent Co(2)O6 octahedra, corners with two equivalent Co(4)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(2)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Co(1)O6 octahedra, and edges with two equivalent Co(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 6-19°. In the fourth Na site, Na(4) is bonded to one O(7), one O(8), two equivalent O(2), and two equivalent O(5) atoms to form distorted NaO6 octahedra that share corners with two equivalent Na(3)O6 octahedra, corners with two equivalent Co(2)O6 octahedra, corners with two equivalent Co(4)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(2)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Co(1)O6 octahedra, and edges with two equivalent Co(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 6-19°. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(2), two equivalent O(4), and two equivalent O(8) atoms to form CoO6 octahedra that share corners with two equivalent Na(1)O6 octahedra, corners with two equivalent Na(2)O6 octahedra, corners with two equivalent Co(3)O6 octahedra,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Na(2)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Co(1)O6 octahedra, edges with two equivalent Co(2)O6 octahedra, and edges with two equivalent Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 6-14°. In the second Co site, Co(2) is bonded to one O(3), one O(4), two equivalent O(2), and two equivalent O(6) atoms to form CoO6 octahedra that share corners with two equivalent Na(3)O6 octahedra, corners with two equivalent Na(4)O6 octahedra, corners with two equivalent Co(4)O6 octahedra,  an edgeedge with one Na(3)O6 octahedra,  an edgeedge with one Na(4)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Co(1)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 6-14°. In the third Co site, Co(3) is bonded to one O(1), one O(2), two equivalent O(3), and two equivalent O(7) atoms to form distorted CoO6 octahedra that share corners with two equivalent Na(1)O6 octahedra, corners with two equivalent Na(2)O6 octahedra, corners with two equivalent Co(1)O6 octahedra,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Na(2)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Co(2)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 6-14°. In the fourth Co site, Co(4) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(5) atoms to form CoO6 octahedra that share corners with two equivalent Na(3)O6 octahedra, corners with two equivalent Na(4)O6 octahedra, corners with two equivalent Co(2)O6 octahedra,  an edgeedge with one Na(3)O6 octahedra,  an edgeedge with one Na(4)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Co(1)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 6-15°. There are eight inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Na(3), one Co(1), one Co(3), and two equivalent Co(4) atoms to form ONa2Co4 octahedra that share corners with two equivalent O(2)Na2Co4 octahedra, corners with two equivalent O(5)Na4Co2 octahedra, corners with two equivalent O(6)Na4Co2 octahedra,  an edgeedge with one O(5)Na4Co2 octahedra,  an edgeedge with one O(6)Na4Co2 octahedra, edges with two equivalent O(1)Na2Co4 octahedra, edges with two equivalent O(3)Na2Co4 octahedra, edges with two equivalent O(4)Na2Co4 octahedra, edges with two equivalent O(7)Na4Co2 octahedra, and edges with two equivalent O(8)Na4Co2 octahedra. The corner-sharing octahedral tilt angles range from 1-12°. In the second O site, O(2) is bonded to two equivalent Na(4), one Co(1), one Co(3), and two equivalent Co(2) atoms to form ONa2Co4 octahedra that share corners with two equivalent O(1)Na2Co4 octahedra, corners with two equivalent O(5)Na4Co2 octahedra, corners with two equivalent O(6)Na4Co2 octahedra,  an edgeedge with one O(5)Na4Co2 octahedra,  an edgeedge with one O(6)Na4Co2 octahedra, edges with two equivalent O(2)Na2Co4 octahedra, edges with two equivalent O(3)Na2Co4 octahedra, edges with two equivalent O(4)Na2Co4 octahedra, edges with two equivalent O(7)Na4Co2 octahedra, and edges with two equivalent O(8)Na4Co2 octahedra. The corner-sharing octahedral tilt angles range from 2-12°. In the third O site, O(3) is bonded to two equivalent Na(1), one Co(2), one Co(4), and two equivalent Co(3) atoms to form ONa2Co4 octahedra that share corners with two equivalent O(4)Na2Co4 octahedra, corners with two equivalent O(7)Na4Co2 octahedra, corners with two equivalent O(8)Na4Co2 octahedra,  an edgeedge with one O(7)Na4Co2 octahedra,  an edgeedge with one O(8)Na4Co2 octahedra, edges with two equivalent O(1)Na2Co4 octahedra, edges with two equivalent O(2)Na2Co4 octahedra, edges with two equivalent O(3)Na2Co4 octahedra, edges with two equivalent O(5)Na4Co2 octahedra, and edges with two equivalent O(6)Na4Co2 octahedra. The corner-sharing octahedral tilt angles range from 1-12°. In the fourth O site, O(4) is bonded to two equivalent Na(2), one Co(2), one Co(4), and two equivalent Co(1) atoms to form ONa2Co4 octahedra that share corners with two equivalent O(3)Na2Co4 octahedra, corners with two equivalent O(7)Na4Co2 octahedra, corners with two equivalent O(8)Na4Co2 octahedra,  an edgeedge with one O(7)Na4Co2 octahedra,  an edgeedge with one O(8)Na4Co2 octahedra, edges with two equivalent O(1)Na2Co4 octahedra, edges with two equivalent O(2)Na2Co4 octahedra, edges with two equivalent O(4)Na2Co4 octahedra, edges with two equivalent O(5)Na4Co2 octahedra, and edges with two equivalent O(6)Na4Co2 octahedra. The corner-sharing octahedral tilt angles range from 1-12°. In the fifth O site, O(5) is bonded to one Na(1), one Na(2), two equivalent Na(4), and two equivalent Co(4) atoms to form distorted ONa4Co2 octahedra that share corners with two equivalent O(1)Na2Co4 octahedra, corners with two equivalent O(2)Na2Co4 octahedra, corners with two equivalent O(6)Na4Co2 octahedra,  an edgeedge with one O(1)Na2Co4 octahedra,  an edgeedge with one O(2)Na2Co4 octahedra, edges with two equivalent O(3)Na2Co4 octahedra, edges with two equivalent O(4)Na2Co4 octahedra, edges with two equivalent O(5)Na4Co2 octahedra, edges with two equivalent O(7)Na4Co2 octahedra, and edges with two equivalent O(8)Na4Co2 octahedra. The corner-sharing octahedral tilt angles range from 2-20°. In the sixth O site, O(6) is bonded to one Na(1), one Na(2), two equivalent Na(3), and two equivalent Co(2) atoms to form distorted ONa4Co2 octahedra that share corners with two equivalent O(1)Na2Co4 octahedra, corners with two equivalent O(2)Na2Co4 octahedra, corners with two equivalent O(5)Na4Co2 octahedra,  an edgeedge with one O(1)Na2Co4 octahedra,  an edgeedge with one O(2)Na2Co4 octahedra, edges with two equivalent O(3)Na2Co4 octahedra, edges with two equivalent O(4)Na2Co4 octahedra, edges with two equivalent O(6)Na4Co2 octahedra, edges with two equivalent O(7)Na4Co2 octahedra, and edges with two equivalent O(8)Na4Co2 octahedra. The corner-sharing octahedral tilt angles range from 1-20°. In the seventh O site, O(7) is bonded to one Na(3), one Na(4), two equivalent Na(2), and two equivalent Co(3) atoms to form distorted ONa4Co2 octahedra that share corners with two equivalent O(3)Na2Co4 octahedra, corners with two equivalent O(4)Na2Co4 octahedra, corners with two equivalent O(8)Na4Co2 octahedra,  an edgeedge with one O(3)Na2Co4 octahedra,  an edgeedge with one O(4)Na2Co4 octahedra, edges with two equivalent O(1)Na2Co4 octahedra, edges with two equivalent O(2)Na2Co4 octahedra, edges with two equivalent O(5)Na4Co2 octahedra, edges with two equivalent O(6)Na4Co2 octahedra, and edges with two equivalent O(7)Na4Co2 octahedra. The corner-sharing octahedral tilt angles range from 1-20°. In the eighth O site, O(8) is bonded to one Na(3), one Na(4), two equivalent Na(1), and two equivalent Co(1) atoms to form distorted ONa4Co2 octahedra that share corners with two equivalent O(3)Na2Co4 octahedra, corners with two equivalent O(4)Na2Co4 octahedra, corners with two equivalent O(7)Na4Co2 octahedra,  an edgeedge with one O(3)Na2Co4 octahedra,  an edgeedge with one O(4)Na2Co4 octahedra, edges with two equivalent O(1)Na2Co4 octahedra, edges with two equivalent O(2)Na2Co4 octahedra, edges with two equivalent O(5)Na4Co2 octahedra, edges with two equivalent O(6)Na4Co2 octahedra, and edges with two equivalent O(8)Na4Co2 octahedra. The corner-sharing octahedral tilt angles range from 1-20°.
NaCoO2 is Caswellsilverite-like structured and crystallizes in the triclinic P1 space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(5), one O(6), two equivalent O(3), and two equivalent O(8) atoms to form distorted NaO6 octahedra that share corners with two equivalent Na(2)O6 octahedra, corners with two equivalent Co(1)O6 octahedra, corners with two equivalent Co(3)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(4)O6 octahedra, edges with two equivalent Co(2)O6 octahedra, and edges with two equivalent Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 6-20°. The Na(1)-O(5) bond length is 2.28 Å. The Na(1)-O(6) bond length is 2.28 Å. Both Na(1)-O(3) bond lengths are 2.40 Å. There is one shorter (2.43 Å) and one longer (2.44 Å) Na(1)-O(8) bond length. In the second Na site, Na(2) is bonded to one O(5), one O(6), two equivalent O(4), and two equivalent O(7) atoms to form distorted NaO6 octahedra that share corners with two equivalent Na(1)O6 octahedra, corners with two equivalent Co(1)O6 octahedra, corners with two equivalent Co(3)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(3)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Co(2)O6 octahedra, and edges with two equivalent Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 6-20°. The Na(2)-O(5) bond length is 2.28 Å. The Na(2)-O(6) bond length is 2.28 Å. Both Na(2)-O(4) bond lengths are 2.41 Å. Both Na(2)-O(7) bond lengths are 2.42 Å. In the third Na site, Na(3) is bonded to one O(7), one O(8), two equivalent O(1), and two equivalent O(6) atoms to form distorted NaO6 octahedra that share corners with two equivalent Na(4)O6 octahedra, corners with two equivalent Co(2)O6 octahedra, corners with two equivalent Co(4)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(2)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Co(1)O6 octahedra, and edges with two equivalent Co(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 6-19°. The Na(3)-O(7) bond length is 2.28 Å. The Na(3)-O(8) bond length is 2.26 Å. There is one shorter (2.41 Å) and one longer (2.42 Å) Na(3)-O(1) bond length. Both Na(3)-O(6) bond lengths are 2.42 Å. In the fourth Na site, Na(4) is bonded to one O(7), one O(8), two equivalent O(2), and two equivalent O(5) atoms to form distorted NaO6 octahedra that share corners with two equivalent Na(3)O6 octahedra, corners with two equivalent Co(2)O6 octahedra, corners with two equivalent Co(4)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(2)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Co(1)O6 octahedra, and edges with two equivalent Co(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 6-19°. The Na(4)-O(7) bond length is 2.28 Å. The Na(4)-O(8) bond length is 2.29 Å. Both Na(4)-O(2) bond lengths are 2.39 Å. There is one shorter (2.43 Å) and one longer (2.44 Å) Na(4)-O(5) bond length. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(2), two equivalent O(4), and two equivalent O(8) atoms to form CoO6 octahedra that share corners with two equivalent Na(1)O6 octahedra, corners with two equivalent Na(2)O6 octahedra, corners with two equivalent Co(3)O6 octahedra,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Na(2)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Co(1)O6 octahedra, edges with two equivalent Co(2)O6 octahedra, and edges with two equivalent Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 6-14°. The Co(1)-O(1) bond length is 2.32 Å. The Co(1)-O(2) bond length is 2.15 Å. There is one shorter (1.96 Å) and one longer (2.10 Å) Co(1)-O(4) bond length. There is one shorter (1.83 Å) and one longer (2.16 Å) Co(1)-O(8) bond length. In the second Co site, Co(2) is bonded to one O(3), one O(4), two equivalent O(2), and two equivalent O(6) atoms to form CoO6 octahedra that share corners with two equivalent Na(3)O6 octahedra, corners with two equivalent Na(4)O6 octahedra, corners with two equivalent Co(4)O6 octahedra,  an edgeedge with one Na(3)O6 octahedra,  an edgeedge with one Na(4)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Co(1)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 6-14°. The Co(2)-O(3) bond length is 2.26 Å. The Co(2)-O(4) bond length is 2.28 Å. There is one shorter (1.95 Å) and one longer (2.08 Å) Co(2)-O(2) bond length. There is one shorter (1.83 Å) and one longer (2.17 Å) Co(2)-O(6) bond length. In the third Co site, Co(3) is bonded to one O(1), one O(2), two equivalent O(3), and two equivalent O(7) atoms to form distorted CoO6 octahedra that share corners with two equivalent Na(1)O6 octahedra, corners with two equivalent Na(2)O6 octahedra, corners with two equivalent Co(1)O6 octahedra,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Na(2)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Co(2)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 6-14°. The Co(3)-O(1) bond length is 2.15 Å. The Co(3)-O(2) bond length is 2.41 Å. There is one shorter (1.94 Å) and one longer (2.09 Å) Co(3)-O(3) bond length. There is one shorter (1.83 Å) and one longer (2.16 Å) Co(3)-O(7) bond length. In the fourth Co site, Co(4) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(5) atoms to form CoO6 octahedra that share corners with two equivalent Na(3)O6 octahedra, corners with two equivalent Na(4)O6 octahedra, corners with two equivalent Co(2)O6 octahedra,  an edgeedge with one Na(3)O6 octahedra,  an edgeedge with one Na(4)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Co(1)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 6-15°. The Co(4)-O(3) bond length is 2.30 Å. The Co(4)-O(4) bond length is 2.20 Å. There is one shorter (1.96 Å) and one longer (2.09 Å) Co(4)-O(1) bond length. There is one shorter (1.83 Å) and one longer (2.17 Å) Co(4)-O(5) bond length. There are eight inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Na(3), one Co(1), one Co(3), and two equivalent Co(4) atoms to form ONa2Co4 octahedra that share corners with two equivalent O(2)Na2Co4 octahedra, corners with two equivalent O(5)Na4Co2 octahedra, corners with two equivalent O(6)Na4Co2 octahedra,  an edgeedge with one O(5)Na4Co2 octahedra,  an edgeedge with one O(6)Na4Co2 octahedra, edges with two equivalent O(1)Na2Co4 octahedra, edges with two equivalent O(3)Na2Co4 octahedra, edges with two equivalent O(4)Na2Co4 octahedra, edges with two equivalent O(7)Na4Co2 octahedra, and edges with two equivalent O(8)Na4Co2 octahedra. The corner-sharing octahedral tilt angles range from 1-12°. In the second O site, O(2) is bonded to two equivalent Na(4), one Co(1), one Co(3), and two equivalent Co(2) atoms to form ONa2Co4 octahedra that share corners with two equivalent O(1)Na2Co4 octahedra, corners with two equivalent O(5)Na4Co2 octahedra, corners with two equivalent O(6)Na4Co2 octahedra,  an edgeedge with one O(5)Na4Co2 octahedra,  an edgeedge with one O(6)Na4Co2 octahedra, edges with two equivalent O(2)Na2Co4 octahedra, edges with two equivalent O(3)Na2Co4 octahedra, edges with two equivalent O(4)Na2Co4 octahedra, edges with two equivalent O(7)Na4Co2 octahedra, and edges with two equivalent O(8)Na4Co2 octahedra. The corner-sharing octahedral tilt angles range from 2-12°. In the third O site, O(3) is bonded to two equivalent Na(1), one Co(2), one Co(4), and two equivalent Co(3) atoms to form ONa2Co4 octahedra that share corners with two equivalent O(4)Na2Co4 octahedra, corners with two equivalent O(7)Na4Co2 octahedra, corners with two equivalent O(8)Na4Co2 octahedra,  an edgeedge with one O(7)Na4Co2 octahedra,  an edgeedge with one O(8)Na4Co2 octahedra, edges with two equivalent O(1)Na2Co4 octahedra, edges with two equivalent O(2)Na2Co4 octahedra, edges with two equivalent O(3)Na2Co4 octahedra, edges with two equivalent O(5)Na4Co2 octahedra, and edges with two equivalent O(6)Na4Co2 octahedra. The corner-sharing octahedral tilt angles range from 1-12°. In the fourth O site, O(4) is bonded to two equivalent Na(2), one Co(2), one Co(4), and two equivalent Co(1) atoms to form ONa2Co4 octahedra that share corners with two equivalent O(3)Na2Co4 octahedra, corners with two equivalent O(7)Na4Co2 octahedra, corners with two equivalent O(8)Na4Co2 octahedra,  an edgeedge with one O(7)Na4Co2 octahedra,  an edgeedge with one O(8)Na4Co2 octahedra, edges with two equivalent O(1)Na2Co4 octahedra, edges with two equivalent O(2)Na2Co4 octahedra, edges with two equivalent O(4)Na2Co4 octahedra, edges with two equivalent O(5)Na4Co2 octahedra, and edges with two equivalent O(6)Na4Co2 octahedra. The corner-sharing octahedral tilt angles range from 1-12°. In the fifth O site, O(5) is bonded to one Na(1), one Na(2), two equivalent Na(4), and two equivalent Co(4) atoms to form distorted ONa4Co2 octahedra that share corners with two equivalent O(1)Na2Co4 octahedra, corners with two equivalent O(2)Na2Co4 octahedra, corners with two equivalent O(6)Na4Co2 octahedra,  an edgeedge with one O(1)Na2Co4 octahedra,  an edgeedge with one O(2)Na2Co4 octahedra, edges with two equivalent O(3)Na2Co4 octahedra, edges with two equivalent O(4)Na2Co4 octahedra, edges with two equivalent O(5)Na4Co2 octahedra, edges with two equivalent O(7)Na4Co2 octahedra, and edges with two equivalent O(8)Na4Co2 octahedra. The corner-sharing octahedral tilt angles range from 2-20°. In the sixth O site, O(6) is bonded to one Na(1), one Na(2), two equivalent Na(3), and two equivalent Co(2) atoms to form distorted ONa4Co2 octahedra that share corners with two equivalent O(1)Na2Co4 octahedra, corners with two equivalent O(2)Na2Co4 octahedra, corners with two equivalent O(5)Na4Co2 octahedra,  an edgeedge with one O(1)Na2Co4 octahedra,  an edgeedge with one O(2)Na2Co4 octahedra, edges with two equivalent O(3)Na2Co4 octahedra, edges with two equivalent O(4)Na2Co4 octahedra, edges with two equivalent O(6)Na4Co2 octahedra, edges with two equivalent O(7)Na4Co2 octahedra, and edges with two equivalent O(8)Na4Co2 octahedra. The corner-sharing octahedral tilt angles range from 1-20°. In the seventh O site, O(7) is bonded to one Na(3), one Na(4), two equivalent Na(2), and two equivalent Co(3) atoms to form distorted ONa4Co2 octahedra that share corners with two equivalent O(3)Na2Co4 octahedra, corners with two equivalent O(4)Na2Co4 octahedra, corners with two equivalent O(8)Na4Co2 octahedra,  an edgeedge with one O(3)Na2Co4 octahedra,  an edgeedge with one O(4)Na2Co4 octahedra, edges with two equivalent O(1)Na2Co4 octahedra, edges with two equivalent O(2)Na2Co4 octahedra, edges with two equivalent O(5)Na4Co2 octahedra, edges with two equivalent O(6)Na4Co2 octahedra, and edges with two equivalent O(7)Na4Co2 octahedra. The corner-sharing octahedral tilt angles range from 1-20°. In the eighth O site, O(8) is bonded to one Na(3), one Na(4), two equivalent Na(1), and two equivalent Co(1) atoms to form distorted ONa4Co2 octahedra that share corners with two equivalent O(3)Na2Co4 octahedra, corners with two equivalent O(4)Na2Co4 octahedra, corners with two equivalent O(7)Na4Co2 octahedra,  an edgeedge with one O(3)Na2Co4 octahedra,  an edgeedge with one O(4)Na2Co4 octahedra, edges with two equivalent O(1)Na2Co4 octahedra, edges with two equivalent O(2)Na2Co4 octahedra, edges with two equivalent O(5)Na4Co2 octahedra, edges with two equivalent O(6)Na4Co2 octahedra, and edges with two equivalent O(8)Na4Co2 octahedra. The corner-sharing octahedral tilt angles range from 1-20°.