Na4FeO5 is High Pressure (4-7GPa) Tellurium-derived structured and crystallizes in the triclinic P-1 space group. There are five inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(1), one O(2), one O(4), one O(5), and two equivalent O(3) atoms to form distorted NaO6 octahedra that share  a cornercorner with one Na(3)O6 octahedra, corners with two equivalent Na(5)O6 octahedra, corners with three equivalent Fe(1)O6 octahedra,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Na(3)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Fe(1)O6 octahedra, edges with three equivalent Na(4)O6 octahedra, and edges with three equivalent Na(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 3-26°. In the second Na site, Na(2) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form distorted NaO6 octahedra that share corners with two equivalent Na(3)O6 octahedra, corners with two equivalent Na(5)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Fe(1)O6 octahedra, edges with four equivalent Na(1)O6 octahedra, and edges with four equivalent Na(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 3-24°. In the third Na site, Na(3) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms to form distorted NaO6 octahedra that share corners with two equivalent Na(1)O6 octahedra, corners with two equivalent Na(2)O6 octahedra, corners with two equivalent Na(4)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, edges with four equivalent Na(4)O6 octahedra, and edges with four equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 17-22°. In the fourth Na site, Na(4) is bonded to one O(2), one O(4), two equivalent O(1), and two equivalent O(5) atoms to form distorted NaO6 octahedra that share  a cornercorner with one Na(3)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra, corners with three equivalent Na(5)O6 octahedra,  an edgeedge with one Na(2)O6 octahedra,  an edgeedge with one Na(5)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with three equivalent Na(1)O6 octahedra, and edges with three equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 6-23°. In the fifth Na site, Na(5) is bonded to one O(2), one O(5), two equivalent O(3), and two equivalent O(4) atoms to form distorted NaO6 octahedra that share  a cornercorner with one Na(2)O6 octahedra, corners with two equivalent Na(1)O6 octahedra, corners with three equivalent Na(4)O6 octahedra,  an edgeedge with one Na(3)O6 octahedra,  an edgeedge with one Na(4)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, edges with three equivalent Na(1)O6 octahedra, and edges with three equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 17-26°. Fe(1) is bonded to one O(2), one O(3), one O(4), one O(5), and two equivalent O(1) atoms to form FeO6 octahedra that share  a cornercorner with one Na(2)O6 octahedra, corners with two equivalent Na(4)O6 octahedra, corners with three equivalent Na(1)O6 octahedra,  an edgeedge with one Na(2)O6 octahedra,  an edgeedge with one Fe(1)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with three equivalent Na(4)O6 octahedra, and edges with three equivalent Na(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 3-14°. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), one Na(3), two equivalent Na(4), and two equivalent Fe(1) atoms to form distorted ONa4Fe2 octahedra that share  a cornercorner with one O(1)Na4Fe2 octahedra,  a cornercorner with one O(2)Na5Fe octahedra,  a cornercorner with one O(5)Na5Fe octahedra, edges with two equivalent O(1)Na4Fe2 octahedra, edges with three equivalent O(2)Na5Fe octahedra, and edges with four equivalent O(5)Na5Fe octahedra. The corner-sharing octahedral tilt angles range from 0-15°. In the second O site, O(2) is bonded to one Na(1), one Na(2), one Na(3), one Na(4), one Na(5), and one Fe(1) atom to form distorted ONa5Fe octahedra that share  a cornercorner with one O(1)Na4Fe2 octahedra,  a cornercorner with one O(5)Na5Fe octahedra, corners with two equivalent O(2)Na5Fe octahedra, edges with three equivalent O(1)Na4Fe2 octahedra, and edges with three equivalent O(5)Na5Fe octahedra. The corner-sharing octahedral tilt angles range from 0-11°. In the third O site, O(3) is bonded in a 6-coordinate geometry to one Na(2), two equivalent Na(1), two equivalent Na(5), and one Fe(1) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Na(1), one Na(2), one Na(4), two equivalent Na(5), and one Fe(1) atom. In the fifth O site, O(5) is bonded to one Na(1), one Na(3), one Na(5), two equivalent Na(4), and one Fe(1) atom to form distorted ONa5Fe octahedra that share  a cornercorner with one O(1)Na4Fe2 octahedra,  a cornercorner with one O(2)Na5Fe octahedra,  a cornercorner with one O(5)Na5Fe octahedra,  an edgeedge with one O(5)Na5Fe octahedra, edges with three equivalent O(2)Na5Fe octahedra, and edges with four equivalent O(1)Na4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-15°.
Na4FeO5 is High Pressure (4-7GPa) Tellurium-derived structured and crystallizes in the triclinic P-1 space group. There are five inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(1), one O(2), one O(4), one O(5), and two equivalent O(3) atoms to form distorted NaO6 octahedra that share  a cornercorner with one Na(3)O6 octahedra, corners with two equivalent Na(5)O6 octahedra, corners with three equivalent Fe(1)O6 octahedra,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Na(3)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Fe(1)O6 octahedra, edges with three equivalent Na(4)O6 octahedra, and edges with three equivalent Na(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 3-26°. The Na(1)-O(1) bond length is 2.60 Å. The Na(1)-O(2) bond length is 2.54 Å. The Na(1)-O(4) bond length is 2.36 Å. The Na(1)-O(5) bond length is 2.31 Å. There is one shorter (2.29 Å) and one longer (2.80 Å) Na(1)-O(3) bond length. In the second Na site, Na(2) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form distorted NaO6 octahedra that share corners with two equivalent Na(3)O6 octahedra, corners with two equivalent Na(5)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Fe(1)O6 octahedra, edges with four equivalent Na(1)O6 octahedra, and edges with four equivalent Na(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 3-24°. Both Na(2)-O(2) bond lengths are 2.31 Å. Both Na(2)-O(3) bond lengths are 2.29 Å. Both Na(2)-O(4) bond lengths are 2.86 Å. In the third Na site, Na(3) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms to form distorted NaO6 octahedra that share corners with two equivalent Na(1)O6 octahedra, corners with two equivalent Na(2)O6 octahedra, corners with two equivalent Na(4)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, edges with four equivalent Na(4)O6 octahedra, and edges with four equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 17-22°. Both Na(3)-O(1) bond lengths are 2.30 Å. Both Na(3)-O(2) bond lengths are 2.37 Å. Both Na(3)-O(5) bond lengths are 2.39 Å. In the fourth Na site, Na(4) is bonded to one O(2), one O(4), two equivalent O(1), and two equivalent O(5) atoms to form distorted NaO6 octahedra that share  a cornercorner with one Na(3)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra, corners with three equivalent Na(5)O6 octahedra,  an edgeedge with one Na(2)O6 octahedra,  an edgeedge with one Na(5)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with three equivalent Na(1)O6 octahedra, and edges with three equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 6-23°. The Na(4)-O(2) bond length is 2.39 Å. The Na(4)-O(4) bond length is 2.31 Å. There is one shorter (2.34 Å) and one longer (2.55 Å) Na(4)-O(1) bond length. There is one shorter (2.34 Å) and one longer (2.61 Å) Na(4)-O(5) bond length. In the fifth Na site, Na(5) is bonded to one O(2), one O(5), two equivalent O(3), and two equivalent O(4) atoms to form distorted NaO6 octahedra that share  a cornercorner with one Na(2)O6 octahedra, corners with two equivalent Na(1)O6 octahedra, corners with three equivalent Na(4)O6 octahedra,  an edgeedge with one Na(3)O6 octahedra,  an edgeedge with one Na(4)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, edges with three equivalent Na(1)O6 octahedra, and edges with three equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 17-26°. The Na(5)-O(2) bond length is 2.44 Å. The Na(5)-O(5) bond length is 2.39 Å. There is one shorter (2.34 Å) and one longer (2.43 Å) Na(5)-O(3) bond length. There is one shorter (2.37 Å) and one longer (2.38 Å) Na(5)-O(4) bond length. Fe(1) is bonded to one O(2), one O(3), one O(4), one O(5), and two equivalent O(1) atoms to form FeO6 octahedra that share  a cornercorner with one Na(2)O6 octahedra, corners with two equivalent Na(4)O6 octahedra, corners with three equivalent Na(1)O6 octahedra,  an edgeedge with one Na(2)O6 octahedra,  an edgeedge with one Fe(1)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with three equivalent Na(4)O6 octahedra, and edges with three equivalent Na(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 3-14°. The Fe(1)-O(2) bond length is 1.91 Å. The Fe(1)-O(3) bond length is 1.88 Å. The Fe(1)-O(4) bond length is 1.87 Å. The Fe(1)-O(5) bond length is 1.92 Å. There is one shorter (1.97 Å) and one longer (2.01 Å) Fe(1)-O(1) bond length. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), one Na(3), two equivalent Na(4), and two equivalent Fe(1) atoms to form distorted ONa4Fe2 octahedra that share  a cornercorner with one O(1)Na4Fe2 octahedra,  a cornercorner with one O(2)Na5Fe octahedra,  a cornercorner with one O(5)Na5Fe octahedra, edges with two equivalent O(1)Na4Fe2 octahedra, edges with three equivalent O(2)Na5Fe octahedra, and edges with four equivalent O(5)Na5Fe octahedra. The corner-sharing octahedral tilt angles range from 0-15°. In the second O site, O(2) is bonded to one Na(1), one Na(2), one Na(3), one Na(4), one Na(5), and one Fe(1) atom to form distorted ONa5Fe octahedra that share  a cornercorner with one O(1)Na4Fe2 octahedra,  a cornercorner with one O(5)Na5Fe octahedra, corners with two equivalent O(2)Na5Fe octahedra, edges with three equivalent O(1)Na4Fe2 octahedra, and edges with three equivalent O(5)Na5Fe octahedra. The corner-sharing octahedral tilt angles range from 0-11°. In the third O site, O(3) is bonded in a 6-coordinate geometry to one Na(2), two equivalent Na(1), two equivalent Na(5), and one Fe(1) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Na(1), one Na(2), one Na(4), two equivalent Na(5), and one Fe(1) atom. In the fifth O site, O(5) is bonded to one Na(1), one Na(3), one Na(5), two equivalent Na(4), and one Fe(1) atom to form distorted ONa5Fe octahedra that share  a cornercorner with one O(1)Na4Fe2 octahedra,  a cornercorner with one O(2)Na5Fe octahedra,  a cornercorner with one O(5)Na5Fe octahedra,  an edgeedge with one O(5)Na5Fe octahedra, edges with three equivalent O(2)Na5Fe octahedra, and edges with four equivalent O(1)Na4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-15°.