Na2FeO3 is Caswellsilverite-like 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 corners with two equivalent Na(3)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra, corners with two equivalent Fe(3)O6 octahedra,  an edgeedge with one Na(6)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra,  an edgeedge with one Fe(1)O6 octahedra,  an edgeedge with one Fe(2)O6 octahedra,  an edgeedge with one Fe(3)O6 octahedra,  an edgeedge with one Fe(4)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, and edges with two equivalent Na(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-17°. 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 corners with two equivalent Na(4)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Fe(4)O6 octahedra,  an edgeedge with one Na(5)O6 octahedra,  an edgeedge with one Na(7)O6 octahedra,  an edgeedge with one Fe(1)O6 octahedra,  an edgeedge with one Fe(2)O6 octahedra,  an edgeedge with one Fe(3)O6 octahedra,  an edgeedge with one Fe(4)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Na(6)O6 octahedra, and edges with two equivalent Na(8)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-17°. In the third Na site, Na(3) is bonded to one O(1), one O(10), one O(12), one O(3), one O(6), and one O(8) atom to form NaO6 octahedra that share corners with two equivalent Na(1)O6 octahedra, corners with two equivalent Na(6)O6 octahedra, corners with two equivalent Na(8)O6 octahedra,  an edgeedge with one Na(5)O6 octahedra,  an edgeedge with one Na(6)O6 octahedra,  an edgeedge with one Na(7)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra,  an edgeedge with one Fe(2)O6 octahedra,  an edgeedge with one Fe(3)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Fe(1)O6 octahedra, and edges with two equivalent Fe(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 16-19°. In the fourth Na site, Na(4) is bonded to one O(11), one O(2), one O(4), one O(5), one O(7), and one O(9) atom to form NaO6 octahedra that share corners with two equivalent Na(2)O6 octahedra, corners with two equivalent Na(5)O6 octahedra, corners with two equivalent Na(7)O6 octahedra,  an edgeedge with one Na(5)O6 octahedra,  an edgeedge with one Na(6)O6 octahedra,  an edgeedge with one Na(7)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra,  an edgeedge with one Fe(1)O6 octahedra,  an edgeedge with one Fe(4)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Fe(2)O6 octahedra, and edges with two equivalent Fe(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 16-18°. 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 corners with two equivalent Na(4)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Fe(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 Na(7)O6 octahedra,  an edgeedge with one Fe(2)O6 octahedra,  an edgeedge with one Fe(4)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(8)O6 octahedra, and edges with two equivalent Fe(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-17°. 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 corners with two equivalent Na(3)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra, corners with two equivalent Fe(3)O6 octahedra,  an edgeedge with one Na(1)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 Fe(2)O6 octahedra,  an edgeedge with one Fe(4)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Na(7)O6 octahedra, and edges with two equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-17°. 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 corners with two equivalent Na(4)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Fe(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 Na(5)O6 octahedra,  an edgeedge with one Fe(1)O6 octahedra,  an edgeedge with one Fe(3)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(6)O6 octahedra, and edges with two equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-18°. 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 corners with two equivalent Na(3)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra, corners with two equivalent Fe(3)O6 octahedra,  an edgeedge with one Na(1)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 Fe(1)O6 octahedra,  an edgeedge with one Fe(3)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, and edges with two equivalent Fe(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-19°. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(12), one O(4), one O(6), one O(8), and one O(9) atom to form FeO6 octahedra that share corners with two equivalent Na(2)O6 octahedra, corners with two equivalent Na(5)O6 octahedra, corners with two equivalent Na(7)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(7)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra,  an edgeedge with one Fe(4)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Na(6)O6 octahedra, and edges with two equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-11°. In the second Fe site, Fe(2) is bonded to one O(1), one O(11), one O(4), one O(6), one O(7), and one O(9) atom to form FeO6 octahedra that share corners with two equivalent Na(1)O6 octahedra, corners with two equivalent Na(6)O6 octahedra, corners with two equivalent 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(5)O6 octahedra,  an edgeedge with one Na(6)O6 octahedra,  an edgeedge with one Fe(3)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Na(7)O6 octahedra, and edges with two equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles are 17°. In the third Fe site, Fe(3) is bonded to one O(10), one O(11), one O(2), one O(3), one O(5), and one O(7) atom to form FeO6 octahedra that share corners with two equivalent Na(1)O6 octahedra, corners with two equivalent Na(6)O6 octahedra, corners with two equivalent 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(7)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra,  an edgeedge with one Fe(2)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, and edges with two equivalent Fe(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-11°. In the fourth Fe site, Fe(4) is bonded to one O(10), one O(12), one O(2), one O(3), one O(5), and one O(8) atom to form FeO6 octahedra that share corners with two equivalent Na(2)O6 octahedra, corners with two equivalent Na(5)O6 octahedra, corners with two equivalent Na(7)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(5)O6 octahedra,  an edgeedge with one Na(6)O6 octahedra,  an edgeedge with one Fe(1)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Na(8)O6 octahedra, and edges with two equivalent Fe(3)O6 octahedra. The corner-sharing octahedral tilt angles are 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(7), one Fe(1), and one Fe(2) atom to form a mixture of distorted corner and edge-sharing ONa4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 3-14°. In the second O site, O(2) is bonded to one Na(2), one Na(4), one Na(5), one Na(8), one Fe(3), and one Fe(4) atom to form a mixture of distorted corner and edge-sharing ONa4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 3-14°. In the third O site, O(3) is bonded to one Na(1), one Na(3), one Na(5), one Na(8), one Fe(3), and one Fe(4) atom to form a mixture of distorted corner and edge-sharing ONa4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 3-14°. In the fourth O site, O(4) is bonded to one Na(2), one Na(4), one Na(6), one Na(7), one Fe(1), and one Fe(2) atom to form a mixture of distorted corner and edge-sharing ONa4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 3-14°. In the fifth O site, O(5) is bonded to one Na(1), one Na(4), one Na(5), one Na(7), one Fe(3), and one Fe(4) atom to form a mixture of distorted corner and edge-sharing ONa4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 4-15°. In the sixth O site, O(6) is bonded to one Na(2), one Na(3), one Na(6), one Na(8), one Fe(1), and one Fe(2) atom to form a mixture of distorted corner and edge-sharing ONa4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 4-15°. In the seventh O site, O(7) is bonded to one Na(1), one Na(4), one Na(6), one Na(7), one Fe(2), and one Fe(3) atom to form a mixture of distorted corner and edge-sharing ONa4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 4-14°. In the eighth O site, O(8) is bonded to one Na(2), one Na(3), one Na(5), one Na(8), one Fe(1), and one Fe(4) atom to form a mixture of distorted corner and edge-sharing ONa4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 4-14°. In the ninth O site, O(9) is bonded to one Na(1), one Na(4), one Na(5), one Na(7), one Fe(1), and one Fe(2) atom to form a mixture of distorted corner and edge-sharing ONa4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 4-14°. In the tenth O site, O(10) is bonded to one Na(2), one Na(3), one Na(6), one Na(8), one Fe(3), and one Fe(4) atom to form a mixture of distorted corner and edge-sharing ONa4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 4-14°. In the eleventh O site, O(11) is bonded to one Na(1), one Na(4), one Na(5), one Na(8), one Fe(2), and one Fe(3) atom to form a mixture of distorted corner and edge-sharing ONa4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 4-15°. In the twelfth O site, O(12) is bonded to one Na(2), one Na(3), one Na(6), one Na(7), one Fe(1), and one Fe(4) atom to form a mixture of distorted corner and edge-sharing ONa4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 4-15°.
Na2FeO3 is Caswellsilverite-like 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 corners with two equivalent Na(3)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra, corners with two equivalent Fe(3)O6 octahedra,  an edgeedge with one Na(6)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra,  an edgeedge with one Fe(1)O6 octahedra,  an edgeedge with one Fe(2)O6 octahedra,  an edgeedge with one Fe(3)O6 octahedra,  an edgeedge with one Fe(4)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, and edges with two equivalent Na(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-17°. The Na(1)-O(1) bond length is 2.21 Å. The Na(1)-O(11) bond length is 2.51 Å. The Na(1)-O(3) bond length is 2.21 Å. The Na(1)-O(5) bond length is 2.49 Å. The Na(1)-O(7) bond length is 2.39 Å. The Na(1)-O(9) bond length is 2.39 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 corners with two equivalent Na(4)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Fe(4)O6 octahedra,  an edgeedge with one Na(5)O6 octahedra,  an edgeedge with one Na(7)O6 octahedra,  an edgeedge with one Fe(1)O6 octahedra,  an edgeedge with one Fe(2)O6 octahedra,  an edgeedge with one Fe(3)O6 octahedra,  an edgeedge with one Fe(4)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Na(6)O6 octahedra, and edges with two equivalent Na(8)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-17°. The Na(2)-O(10) bond length is 2.38 Å. The Na(2)-O(12) bond length is 2.50 Å. The Na(2)-O(2) bond length is 2.21 Å. The Na(2)-O(4) bond length is 2.21 Å. The Na(2)-O(6) bond length is 2.52 Å. The Na(2)-O(8) bond length is 2.39 Å. In the third Na site, Na(3) is bonded to one O(1), one O(10), one O(12), one O(3), one O(6), and one O(8) atom to form NaO6 octahedra that share corners with two equivalent Na(1)O6 octahedra, corners with two equivalent Na(6)O6 octahedra, corners with two equivalent Na(8)O6 octahedra,  an edgeedge with one Na(5)O6 octahedra,  an edgeedge with one Na(6)O6 octahedra,  an edgeedge with one Na(7)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra,  an edgeedge with one Fe(2)O6 octahedra,  an edgeedge with one Fe(3)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Fe(1)O6 octahedra, and edges with two equivalent Fe(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 16-19°. The Na(3)-O(1) bond length is 2.26 Å. The Na(3)-O(10) bond length is 2.25 Å. The Na(3)-O(12) bond length is 2.25 Å. The Na(3)-O(3) bond length is 2.26 Å. The Na(3)-O(6) bond length is 2.25 Å. The Na(3)-O(8) bond length is 2.25 Å. In the fourth Na site, Na(4) is bonded to one O(11), one O(2), one O(4), one O(5), one O(7), and one O(9) atom to form NaO6 octahedra that share corners with two equivalent Na(2)O6 octahedra, corners with two equivalent Na(5)O6 octahedra, corners with two equivalent Na(7)O6 octahedra,  an edgeedge with one Na(5)O6 octahedra,  an edgeedge with one Na(6)O6 octahedra,  an edgeedge with one Na(7)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra,  an edgeedge with one Fe(1)O6 octahedra,  an edgeedge with one Fe(4)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Fe(2)O6 octahedra, and edges with two equivalent Fe(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 16-18°. The Na(4)-O(11) bond length is 2.25 Å. The Na(4)-O(2) bond length is 2.26 Å. The Na(4)-O(4) bond length is 2.26 Å. The Na(4)-O(5) bond length is 2.25 Å. The Na(4)-O(7) bond length is 2.25 Å. The Na(4)-O(9) bond length is 2.25 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 corners with two equivalent Na(4)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Fe(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 Na(7)O6 octahedra,  an edgeedge with one Fe(2)O6 octahedra,  an edgeedge with one Fe(4)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(8)O6 octahedra, and edges with two equivalent Fe(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-17°. The Na(5)-O(11) bond length is 2.23 Å. The Na(5)-O(2) bond length is 2.34 Å. The Na(5)-O(3) bond length is 2.33 Å. The Na(5)-O(5) bond length is 2.23 Å. The Na(5)-O(8) bond length is 2.56 Å. The Na(5)-O(9) bond length is 2.54 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 corners with two equivalent Na(3)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra, corners with two equivalent Fe(3)O6 octahedra,  an edgeedge with one Na(1)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 Fe(2)O6 octahedra,  an edgeedge with one Fe(4)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Na(7)O6 octahedra, and edges with two equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-17°. The Na(6)-O(1) bond length is 2.33 Å. The Na(6)-O(10) bond length is 2.55 Å. The Na(6)-O(12) bond length is 2.23 Å. The Na(6)-O(4) bond length is 2.34 Å. The Na(6)-O(6) bond length is 2.23 Å. The Na(6)-O(7) bond length is 2.55 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 corners with two equivalent Na(4)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Fe(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 Na(5)O6 octahedra,  an edgeedge with one Fe(1)O6 octahedra,  an edgeedge with one Fe(3)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(6)O6 octahedra, and edges with two equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-18°. The Na(7)-O(1) bond length is 2.43 Å. The Na(7)-O(12) bond length is 2.41 Å. The Na(7)-O(4) bond length is 2.44 Å. The Na(7)-O(5) bond length is 2.41 Å. The Na(7)-O(7) bond length is 2.24 Å. The Na(7)-O(9) bond length is 2.24 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 corners with two equivalent Na(3)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra, corners with two equivalent Fe(3)O6 octahedra,  an edgeedge with one Na(1)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 Fe(1)O6 octahedra,  an edgeedge with one Fe(3)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, and edges with two equivalent Fe(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-19°. The Na(8)-O(10) bond length is 2.24 Å. The Na(8)-O(11) bond length is 2.42 Å. The Na(8)-O(2) bond length is 2.43 Å. The Na(8)-O(3) bond length is 2.44 Å. The Na(8)-O(6) bond length is 2.41 Å. The Na(8)-O(8) bond length is 2.24 Å. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(12), one O(4), one O(6), one O(8), and one O(9) atom to form FeO6 octahedra that share corners with two equivalent Na(2)O6 octahedra, corners with two equivalent Na(5)O6 octahedra, corners with two equivalent Na(7)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(7)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra,  an edgeedge with one Fe(4)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Na(6)O6 octahedra, and edges with two equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-11°. The Fe(1)-O(1) bond length is 1.92 Å. The Fe(1)-O(12) bond length is 1.89 Å. The Fe(1)-O(4) bond length is 1.92 Å. The Fe(1)-O(6) bond length is 1.89 Å. The Fe(1)-O(8) bond length is 1.89 Å. The Fe(1)-O(9) bond length is 1.89 Å. In the second Fe site, Fe(2) is bonded to one O(1), one O(11), one O(4), one O(6), one O(7), and one O(9) atom to form FeO6 octahedra that share corners with two equivalent Na(1)O6 octahedra, corners with two equivalent Na(6)O6 octahedra, corners with two equivalent 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(5)O6 octahedra,  an edgeedge with one Na(6)O6 octahedra,  an edgeedge with one Fe(3)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Na(7)O6 octahedra, and edges with two equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles are 17°. The Fe(2)-O(1) bond length is 2.03 Å. The Fe(2)-O(11) bond length is 2.06 Å. The Fe(2)-O(4) bond length is 2.03 Å. The Fe(2)-O(6) bond length is 2.06 Å. The Fe(2)-O(7) bond length is 2.03 Å. The Fe(2)-O(9) bond length is 2.03 Å. In the third Fe site, Fe(3) is bonded to one O(10), one O(11), one O(2), one O(3), one O(5), and one O(7) atom to form FeO6 octahedra that share corners with two equivalent Na(1)O6 octahedra, corners with two equivalent Na(6)O6 octahedra, corners with two equivalent 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(7)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra,  an edgeedge with one Fe(2)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, and edges with two equivalent Fe(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-11°. The Fe(3)-O(10) bond length is 1.89 Å. The Fe(3)-O(11) bond length is 1.89 Å. The Fe(3)-O(2) bond length is 1.92 Å. The Fe(3)-O(3) bond length is 1.92 Å. The Fe(3)-O(5) bond length is 1.89 Å. The Fe(3)-O(7) bond length is 1.89 Å. In the fourth Fe site, Fe(4) is bonded to one O(10), one O(12), one O(2), one O(3), one O(5), and one O(8) atom to form FeO6 octahedra that share corners with two equivalent Na(2)O6 octahedra, corners with two equivalent Na(5)O6 octahedra, corners with two equivalent Na(7)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(5)O6 octahedra,  an edgeedge with one Na(6)O6 octahedra,  an edgeedge with one Fe(1)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Na(8)O6 octahedra, and edges with two equivalent Fe(3)O6 octahedra. The corner-sharing octahedral tilt angles are 17°. The Fe(4)-O(10) bond length is 2.02 Å. The Fe(4)-O(12) bond length is 2.06 Å. The Fe(4)-O(2) bond length is 2.03 Å. The Fe(4)-O(3) bond length is 2.03 Å. The Fe(4)-O(5) bond length is 2.06 Å. The Fe(4)-O(8) bond length is 2.02 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(7), one Fe(1), and one Fe(2) atom to form a mixture of distorted corner and edge-sharing ONa4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 3-14°. In the second O site, O(2) is bonded to one Na(2), one Na(4), one Na(5), one Na(8), one Fe(3), and one Fe(4) atom to form a mixture of distorted corner and edge-sharing ONa4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 3-14°. In the third O site, O(3) is bonded to one Na(1), one Na(3), one Na(5), one Na(8), one Fe(3), and one Fe(4) atom to form a mixture of distorted corner and edge-sharing ONa4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 3-14°. In the fourth O site, O(4) is bonded to one Na(2), one Na(4), one Na(6), one Na(7), one Fe(1), and one Fe(2) atom to form a mixture of distorted corner and edge-sharing ONa4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 3-14°. In the fifth O site, O(5) is bonded to one Na(1), one Na(4), one Na(5), one Na(7), one Fe(3), and one Fe(4) atom to form a mixture of distorted corner and edge-sharing ONa4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 4-15°. In the sixth O site, O(6) is bonded to one Na(2), one Na(3), one Na(6), one Na(8), one Fe(1), and one Fe(2) atom to form a mixture of distorted corner and edge-sharing ONa4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 4-15°. In the seventh O site, O(7) is bonded to one Na(1), one Na(4), one Na(6), one Na(7), one Fe(2), and one Fe(3) atom to form a mixture of distorted corner and edge-sharing ONa4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 4-14°. In the eighth O site, O(8) is bonded to one Na(2), one Na(3), one Na(5), one Na(8), one Fe(1), and one Fe(4) atom to form a mixture of distorted corner and edge-sharing ONa4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 4-14°. In the ninth O site, O(9) is bonded to one Na(1), one Na(4), one Na(5), one Na(7), one Fe(1), and one Fe(2) atom to form a mixture of distorted corner and edge-sharing ONa4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 4-14°. In the tenth O site, O(10) is bonded to one Na(2), one Na(3), one Na(6), one Na(8), one Fe(3), and one Fe(4) atom to form a mixture of distorted corner and edge-sharing ONa4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 4-14°. In the eleventh O site, O(11) is bonded to one Na(1), one Na(4), one Na(5), one Na(8), one Fe(2), and one Fe(3) atom to form a mixture of distorted corner and edge-sharing ONa4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 4-15°. In the twelfth O site, O(12) is bonded to one Na(2), one Na(3), one Na(6), one Na(7), one Fe(1), and one Fe(4) atom to form a mixture of distorted corner and edge-sharing ONa4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 4-15°.