Na2FeCPO7 crystallizes in the triclinic P1 space group. There are eight inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one O(1), one O(23), one O(25), one O(7), and one O(9) atom. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(2), one O(24), one O(26), and one O(8) atom. In the third Na site, Na(3) is bonded to one O(12), one O(14), one O(2), one O(4), one O(5), one O(7), and one O(8) atom to form distorted NaO7 pentagonal bipyramids that share  a cornercorner with one Fe(4)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  an edgeedge with one Fe(2)O6 octahedra,  an edgeedge with one Na(4)O7 pentagonal bipyramid,  an edgeedge with one P(2)O4 tetrahedra, and  a faceface with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles are 66°. In the fourth Na site, Na(4) is bonded to one O(10), one O(11), one O(14), one O(2), one O(3), one O(6), and one O(9) atom to form distorted NaO7 pentagonal bipyramids that share  a cornercorner with one Fe(4)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra,  an edgeedge with one Fe(1)O6 octahedra,  an edgeedge with one Na(3)O7 pentagonal bipyramid,  an edgeedge with one P(2)O4 tetrahedra, and  a faceface with one Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles are 62°. In the fifth Na site, Na(5) is bonded in a 7-coordinate geometry to one O(15), one O(18), one O(19), one O(21), one O(23), one O(25), and one O(27) atom. In the sixth Na site, Na(6) is bonded in a 7-coordinate geometry to one O(16), one O(17), one O(19), one O(21), one O(24), one O(26), and one O(28) atom. In the seventh Na site, Na(7) is bonded in a 6-coordinate geometry to one O(20), one O(21), one O(27), one O(28), one O(3), and one O(6) atom. In the eighth Na site, Na(8) is bonded in a 6-coordinate geometry to one O(19), one O(22), one O(27), one O(28), one O(4), and one O(5) atom. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(10), one O(12), one O(16), one O(4), one O(6), and one O(7) atom to form FeO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra,  an edgeedge with one Na(4)O7 pentagonal bipyramid, and  a faceface with one Na(3)O7 pentagonal bipyramid. In the second Fe site, Fe(2) is bonded to one O(11), one O(15), one O(3), one O(5), one O(8), and one O(9) atom to form FeO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra,  an edgeedge with one Na(3)O7 pentagonal bipyramid, and  a faceface with one Na(4)O7 pentagonal bipyramid. In the third Fe site, Fe(3) is bonded to one O(13), one O(17), one O(19), one O(20), one O(23), and one O(26) atom to form FeO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, and  a cornercorner with one P(4)O4 tetrahedra. In the fourth Fe site, Fe(4) is bonded to one O(14), one O(18), one O(21), one O(22), one O(24), and one O(25) atom to form FeO6 octahedra that share  a cornercorner with one Na(3)O7 pentagonal bipyramid,  a cornercorner with one Na(4)O7 pentagonal bipyramid,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, and  a cornercorner with one P(4)O4 tetrahedra. There are four inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one O(27), one O(3), and one O(5) atom. In the second C site, C(2) is bonded in a trigonal planar geometry to one O(28), one O(4), and one O(6) atom. In the third C site, C(3) is bonded in a trigonal planar geometry to one O(1), one O(23), and one O(26) atom. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one O(2), one O(24), and one O(25) atom. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(13), one O(18), one O(7), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one Fe(4)O6 octahedra,  a cornercorner with one Na(3)O7 pentagonal bipyramid, and  a cornercorner with one Na(4)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 32-46°. In the second P site, P(2) is bonded to one O(10), one O(14), one O(17), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one Fe(4)O6 octahedra,  an edgeedge with one Na(3)O7 pentagonal bipyramid, and  an edgeedge with one Na(4)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 33-45°. In the third P site, P(3) is bonded to one O(12), one O(15), one O(19), and one O(22) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one Fe(4)O6 octahedra, and  a cornercorner with one Na(3)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 33-45°. In the fourth P site, P(4) is bonded to one O(11), one O(16), one O(20), and one O(21) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one Fe(4)O6 octahedra, and  a cornercorner with one Na(4)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 32-44°. There are twenty-eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Na(1), one Na(2), and one C(3) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Na(2), one Na(3), one Na(4), and one C(4) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Na(4), one Na(7), one Fe(2), and one C(1) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Na(3), one Na(8), one Fe(1), and one C(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Na(3), one Na(8), one Fe(2), and one C(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Na(4), one Na(7), one Fe(1), and one C(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Na(1), one Na(3), one Fe(1), and one P(1) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Na(2), one Na(3), one Fe(2), and one P(2) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Na(1), one Na(4), one Fe(2), and one P(1) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Na(2), one Na(4), one Fe(1), and one P(2) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Na(4), one Fe(2), and one P(4) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Na(3), one Fe(1), and one P(3) atom. In the thirteenth O site, O(13) is bonded in a bent 150 degrees geometry to one Fe(3) and one P(1) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Na(3), one Na(4), one Fe(4), and one P(2) atom. In the fifteenth O site, O(15) is bonded in a 3-coordinate geometry to one Na(5), one Fe(2), and one P(3) atom. In the sixteenth O site, O(16) is bonded in a 3-coordinate geometry to one Na(6), one Fe(1), and one P(4) atom. In the seventeenth O site, O(17) is bonded in a 3-coordinate geometry to one Na(6), one Fe(3), and one P(2) atom. In the eighteenth O site, O(18) is bonded in a 3-coordinate geometry to one Na(5), one Fe(4), and one P(1) atom. In the nineteenth O site, O(19) is bonded in a 4-coordinate geometry to one Na(5), one Na(6), one Na(8), one Fe(3), and one P(3) atom. In the twentieth O site, O(20) is bonded in a 3-coordinate geometry to one Na(7), one Fe(3), and one P(4) atom. In the twenty-first O site, O(21) is bonded in a 5-coordinate geometry to one Na(5), one Na(6), one Na(7), one Fe(4), and one P(4) atom. In the twenty-second O site, O(22) is bonded in a 3-coordinate geometry to one Na(8), one Fe(4), and one P(3) atom. In the twenty-third O site, O(23) is bonded in a 4-coordinate geometry to one Na(1), one Na(5), one Fe(3), and one C(3) atom. In the twenty-fourth O site, O(24) is bonded in a 3-coordinate geometry to one Na(2), one Na(6), one Fe(4), and one C(4) atom. In the twenty-fifth O site, O(25) is bonded in a 4-coordinate geometry to one Na(1), one Na(5), one Fe(4), and one C(4) atom. In the twenty-sixth O site, O(26) is bonded in a distorted rectangular see-saw-like geometry to one Na(2), one Na(6), one Fe(3), and one C(3) atom. In the twenty-seventh O site, O(27) is bonded in a 3-coordinate geometry to one Na(5), one Na(7), one Na(8), and one C(1) atom. In the twenty-eighth O site, O(28) is bonded in a 4-coordinate geometry to one Na(6), one Na(7), one Na(8), and one C(2) atom.
Na2FeCPO7 crystallizes in the triclinic P1 space group. There are eight inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one O(1), one O(23), one O(25), one O(7), and one O(9) atom. The Na(1)-O(1) bond length is 2.34 Å. The Na(1)-O(23) bond length is 2.65 Å. The Na(1)-O(25) bond length is 2.45 Å. The Na(1)-O(7) bond length is 2.50 Å. The Na(1)-O(9) bond length is 2.55 Å. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(2), one O(24), one O(26), and one O(8) atom. The Na(2)-O(1) bond length is 2.50 Å. The Na(2)-O(10) bond length is 2.45 Å. The Na(2)-O(2) bond length is 2.68 Å. The Na(2)-O(24) bond length is 2.92 Å. The Na(2)-O(26) bond length is 2.37 Å. The Na(2)-O(8) bond length is 2.42 Å. In the third Na site, Na(3) is bonded to one O(12), one O(14), one O(2), one O(4), one O(5), one O(7), and one O(8) atom to form distorted NaO7 pentagonal bipyramids that share  a cornercorner with one Fe(4)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  an edgeedge with one Fe(2)O6 octahedra,  an edgeedge with one Na(4)O7 pentagonal bipyramid,  an edgeedge with one P(2)O4 tetrahedra, and  a faceface with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles are 66°. The Na(3)-O(12) bond length is 2.31 Å. The Na(3)-O(14) bond length is 2.67 Å. The Na(3)-O(2) bond length is 2.30 Å. The Na(3)-O(4) bond length is 2.52 Å. The Na(3)-O(5) bond length is 2.33 Å. The Na(3)-O(7) bond length is 2.59 Å. The Na(3)-O(8) bond length is 2.73 Å. In the fourth Na site, Na(4) is bonded to one O(10), one O(11), one O(14), one O(2), one O(3), one O(6), and one O(9) atom to form distorted NaO7 pentagonal bipyramids that share  a cornercorner with one Fe(4)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra,  an edgeedge with one Fe(1)O6 octahedra,  an edgeedge with one Na(3)O7 pentagonal bipyramid,  an edgeedge with one P(2)O4 tetrahedra, and  a faceface with one Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles are 62°. The Na(4)-O(10) bond length is 2.72 Å. The Na(4)-O(11) bond length is 2.33 Å. The Na(4)-O(14) bond length is 2.64 Å. The Na(4)-O(2) bond length is 2.30 Å. The Na(4)-O(3) bond length is 2.51 Å. The Na(4)-O(6) bond length is 2.35 Å. The Na(4)-O(9) bond length is 2.56 Å. In the fifth Na site, Na(5) is bonded in a 7-coordinate geometry to one O(15), one O(18), one O(19), one O(21), one O(23), one O(25), and one O(27) atom. The Na(5)-O(15) bond length is 2.52 Å. The Na(5)-O(18) bond length is 2.35 Å. The Na(5)-O(19) bond length is 2.91 Å. The Na(5)-O(21) bond length is 2.56 Å. The Na(5)-O(23) bond length is 2.42 Å. The Na(5)-O(25) bond length is 2.67 Å. The Na(5)-O(27) bond length is 2.25 Å. In the sixth Na site, Na(6) is bonded in a 7-coordinate geometry to one O(16), one O(17), one O(19), one O(21), one O(24), one O(26), and one O(28) atom. The Na(6)-O(16) bond length is 2.55 Å. The Na(6)-O(17) bond length is 2.37 Å. The Na(6)-O(19) bond length is 2.53 Å. The Na(6)-O(21) bond length is 2.83 Å. The Na(6)-O(24) bond length is 2.43 Å. The Na(6)-O(26) bond length is 2.56 Å. The Na(6)-O(28) bond length is 2.26 Å. In the seventh Na site, Na(7) is bonded in a 6-coordinate geometry to one O(20), one O(21), one O(27), one O(28), one O(3), and one O(6) atom. The Na(7)-O(20) bond length is 2.40 Å. The Na(7)-O(21) bond length is 2.64 Å. The Na(7)-O(27) bond length is 2.89 Å. The Na(7)-O(28) bond length is 2.48 Å. The Na(7)-O(3) bond length is 2.39 Å. The Na(7)-O(6) bond length is 2.70 Å. In the eighth Na site, Na(8) is bonded in a 6-coordinate geometry to one O(19), one O(22), one O(27), one O(28), one O(4), and one O(5) atom. The Na(8)-O(19) bond length is 2.54 Å. The Na(8)-O(22) bond length is 2.44 Å. The Na(8)-O(27) bond length is 2.44 Å. The Na(8)-O(28) bond length is 2.83 Å. The Na(8)-O(4) bond length is 2.39 Å. The Na(8)-O(5) bond length is 2.71 Å. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(10), one O(12), one O(16), one O(4), one O(6), and one O(7) atom to form FeO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra,  an edgeedge with one Na(4)O7 pentagonal bipyramid, and  a faceface with one Na(3)O7 pentagonal bipyramid. The Fe(1)-O(10) bond length is 2.06 Å. The Fe(1)-O(12) bond length is 1.97 Å. The Fe(1)-O(16) bond length is 1.96 Å. The Fe(1)-O(4) bond length is 2.15 Å. The Fe(1)-O(6) bond length is 2.12 Å. The Fe(1)-O(7) bond length is 2.04 Å. In the second Fe site, Fe(2) is bonded to one O(11), one O(15), one O(3), one O(5), one O(8), and one O(9) atom to form FeO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra,  an edgeedge with one Na(3)O7 pentagonal bipyramid, and  a faceface with one Na(4)O7 pentagonal bipyramid. The Fe(2)-O(11) bond length is 1.97 Å. The Fe(2)-O(15) bond length is 1.97 Å. The Fe(2)-O(3) bond length is 2.15 Å. The Fe(2)-O(5) bond length is 2.12 Å. The Fe(2)-O(8) bond length is 2.03 Å. The Fe(2)-O(9) bond length is 2.06 Å. In the third Fe site, Fe(3) is bonded to one O(13), one O(17), one O(19), one O(20), one O(23), and one O(26) atom to form FeO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, and  a cornercorner with one P(4)O4 tetrahedra. The Fe(3)-O(13) bond length is 1.94 Å. The Fe(3)-O(17) bond length is 2.00 Å. The Fe(3)-O(19) bond length is 2.11 Å. The Fe(3)-O(20) bond length is 1.99 Å. The Fe(3)-O(23) bond length is 2.13 Å. The Fe(3)-O(26) bond length is 2.11 Å. In the fourth Fe site, Fe(4) is bonded to one O(14), one O(18), one O(21), one O(22), one O(24), and one O(25) atom to form FeO6 octahedra that share  a cornercorner with one Na(3)O7 pentagonal bipyramid,  a cornercorner with one Na(4)O7 pentagonal bipyramid,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, and  a cornercorner with one P(4)O4 tetrahedra. The Fe(4)-O(14) bond length is 1.99 Å. The Fe(4)-O(18) bond length is 1.95 Å. The Fe(4)-O(21) bond length is 2.11 Å. The Fe(4)-O(22) bond length is 1.98 Å. The Fe(4)-O(24) bond length is 2.11 Å. The Fe(4)-O(25) bond length is 2.17 Å. There are four inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one O(27), one O(3), and one O(5) atom. The C(1)-O(27) bond length is 1.27 Å. The C(1)-O(3) bond length is 1.32 Å. The C(1)-O(5) bond length is 1.31 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one O(28), one O(4), and one O(6) atom. The C(2)-O(28) bond length is 1.27 Å. The C(2)-O(4) bond length is 1.32 Å. The C(2)-O(6) bond length is 1.31 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one O(1), one O(23), and one O(26) atom. The C(3)-O(1) bond length is 1.26 Å. The C(3)-O(23) bond length is 1.32 Å. The C(3)-O(26) bond length is 1.32 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one O(2), one O(24), and one O(25) atom. The C(4)-O(2) bond length is 1.28 Å. The C(4)-O(24) bond length is 1.31 Å. The C(4)-O(25) bond length is 1.31 Å. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(13), one O(18), one O(7), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one Fe(4)O6 octahedra,  a cornercorner with one Na(3)O7 pentagonal bipyramid, and  a cornercorner with one Na(4)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 32-46°. The P(1)-O(13) bond length is 1.54 Å. The P(1)-O(18) bond length is 1.55 Å. The P(1)-O(7) bond length is 1.56 Å. The P(1)-O(9) bond length is 1.56 Å. In the second P site, P(2) is bonded to one O(10), one O(14), one O(17), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one Fe(4)O6 octahedra,  an edgeedge with one Na(3)O7 pentagonal bipyramid, and  an edgeedge with one Na(4)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 33-45°. The P(2)-O(10) bond length is 1.55 Å. The P(2)-O(14) bond length is 1.57 Å. The P(2)-O(17) bond length is 1.54 Å. The P(2)-O(8) bond length is 1.55 Å. In the third P site, P(3) is bonded to one O(12), one O(15), one O(19), and one O(22) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one Fe(4)O6 octahedra, and  a cornercorner with one Na(3)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 33-45°. The P(3)-O(12) bond length is 1.54 Å. The P(3)-O(15) bond length is 1.56 Å. The P(3)-O(19) bond length is 1.55 Å. The P(3)-O(22) bond length is 1.55 Å. In the fourth P site, P(4) is bonded to one O(11), one O(16), one O(20), and one O(21) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one Fe(4)O6 octahedra, and  a cornercorner with one Na(4)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 32-44°. The P(4)-O(11) bond length is 1.54 Å. The P(4)-O(16) bond length is 1.56 Å. The P(4)-O(20) bond length is 1.54 Å. The P(4)-O(21) bond length is 1.56 Å. There are twenty-eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Na(1), one Na(2), and one C(3) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Na(2), one Na(3), one Na(4), and one C(4) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Na(4), one Na(7), one Fe(2), and one C(1) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Na(3), one Na(8), one Fe(1), and one C(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Na(3), one Na(8), one Fe(2), and one C(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Na(4), one Na(7), one Fe(1), and one C(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Na(1), one Na(3), one Fe(1), and one P(1) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Na(2), one Na(3), one Fe(2), and one P(2) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Na(1), one Na(4), one Fe(2), and one P(1) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Na(2), one Na(4), one Fe(1), and one P(2) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Na(4), one Fe(2), and one P(4) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Na(3), one Fe(1), and one P(3) atom. In the thirteenth O site, O(13) is bonded in a bent 150 degrees geometry to one Fe(3) and one P(1) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Na(3), one Na(4), one Fe(4), and one P(2) atom. In the fifteenth O site, O(15) is bonded in a 3-coordinate geometry to one Na(5), one Fe(2), and one P(3) atom. In the sixteenth O site, O(16) is bonded in a 3-coordinate geometry to one Na(6), one Fe(1), and one P(4) atom. In the seventeenth O site, O(17) is bonded in a 3-coordinate geometry to one Na(6), one Fe(3), and one P(2) atom. In the eighteenth O site, O(18) is bonded in a 3-coordinate geometry to one Na(5), one Fe(4), and one P(1) atom. In the nineteenth O site, O(19) is bonded in a 4-coordinate geometry to one Na(5), one Na(6), one Na(8), one Fe(3), and one P(3) atom. In the twentieth O site, O(20) is bonded in a 3-coordinate geometry to one Na(7), one Fe(3), and one P(4) atom. In the twenty-first O site, O(21) is bonded in a 5-coordinate geometry to one Na(5), one Na(6), one Na(7), one Fe(4), and one P(4) atom. In the twenty-second O site, O(22) is bonded in a 3-coordinate geometry to one Na(8), one Fe(4), and one P(3) atom. In the twenty-third O site, O(23) is bonded in a 4-coordinate geometry to one Na(1), one Na(5), one Fe(3), and one C(3) atom. In the twenty-fourth O site, O(24) is bonded in a 3-coordinate geometry to one Na(2), one Na(6), one Fe(4), and one C(4) atom. In the twenty-fifth O site, O(25) is bonded in a 4-coordinate geometry to one Na(1), one Na(5), one Fe(4), and one C(4) atom. In the twenty-sixth O site, O(26) is bonded in a distorted rectangular see-saw-like geometry to one Na(2), one Na(6), one Fe(3), and one C(3) atom. In the twenty-seventh O site, O(27) is bonded in a 3-coordinate geometry to one Na(5), one Na(7), one Na(8), and one C(1) atom. In the twenty-eighth O site, O(28) is bonded in a 4-coordinate geometry to one Na(6), one Na(7), one Na(8), and one C(2) atom.