The material structure described by Na4Mg(Fe2O5)2 crystallizes in the monoclinic Cm space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 8-coordinate geometry to one O(3), one O(5), two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms. In the second Na site, Na(2) is bonded in a 7-coordinate geometry to one O(4), one O(5), one O(6), two equivalent O(1), and two equivalent O(2) atoms. Mg(1) is bonded to one O(6), two equivalent O(4), and two equivalent O(5) atoms to form distorted MgO5 square pyramids that share corners with four equivalent Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O4 tetrahedra,  a cornercorner with one Fe(3)O4 tetrahedra,  an edgeedge with one Fe(2)O4 tetrahedra, and  an edgeedge with one Fe(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 35-38°. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(4), one O(5), two equivalent O(1), and two equivalent O(2) atoms to form FeO6 octahedra that share corners with four equivalent Fe(1)O6 octahedra, corners with two equivalent Mg(1)O5 square pyramids,  a cornercorner with one Fe(2)O4 tetrahedra, and  a cornercorner with one Fe(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 6-16°. In the second Fe site, Fe(2) is bonded to one O(3), one O(6), and two equivalent O(4) atoms to form distorted FeO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra,  a cornercorner with one Mg(1)O5 square pyramid, corners with two equivalent Fe(3)O4 tetrahedra, and  an edgeedge with one Mg(1)O5 square pyramid. The corner-sharing octahedral tilt angles are 51°. In the third Fe site, Fe(3) is bonded to one O(3), one O(6), and two equivalent O(5) atoms to form FeO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra,  a cornercorner with one Mg(1)O5 square pyramid, corners with two equivalent Fe(2)O4 tetrahedra, and  an edgeedge with one Mg(1)O5 square pyramid. The corner-sharing octahedral tilt angles are 56°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to two equivalent Na(1), two equivalent Na(2), and two equivalent Fe(1) atoms. In the second O site, O(2) is bonded to two equivalent Na(1), two equivalent Na(2), and two equivalent Fe(1) atoms to form distorted ONa4Fe2 octahedra that share corners with two equivalent O(2)Na4Fe2 octahedra, corners with two equivalent O(3)Na2Fe2 tetrahedra, corners with two equivalent O(6)Na2MgFe2 trigonal bipyramids, and edges with two equivalent O(2)Na4Fe2 octahedra. The corner-sharing octahedral tilt angles are 3°. In the third O site, O(3) is bonded to two equivalent Na(1), one Fe(2), and one Fe(3) atom to form ONa2Fe2 tetrahedra that share corners with four equivalent O(2)Na4Fe2 octahedra and corners with two equivalent O(6)Na2MgFe2 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 22-83°. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Na(2), two equivalent Na(1), one Mg(1), one Fe(1), and one Fe(2) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Mg(1), one Fe(1), and one Fe(3) atom. In the sixth O site, O(6) is bonded to two equivalent Na(2), one Mg(1), one Fe(2), and one Fe(3) atom to form distorted ONa2MgFe2 trigonal bipyramids that share corners with four equivalent O(2)Na4Fe2 octahedra and corners with two equivalent O(3)Na2Fe2 tetrahedra. The corner-sharing octahedral tilt angles range from 54-66°. is represented by the CIF card [CIF]
data_Na4Mg(Fe2O5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.455
_cell_length_b   8.121
_cell_length_c   5.749
_cell_angle_alpha   69.272
_cell_angle_beta   89.996
_cell_angle_gamma   70.360
_symmetry_Int_Tables_number   1
_cell_volume   222.253
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Na  Na0  1  0.604  0.782  0.154  1.0
  Na  Na1  1  0.885  0.219  0.436  1.0
  Na  Na2  1  0.429  0.176  0.896  1.0
  Na  Na3  1  0.106  0.824  0.572  1.0
  Mg  Mg4  1  0.081  0.500  0.551  1.0
  Fe  Fe5  1  0.023  0.993  0.011  1.0
  Fe  Fe6  1  0.180  0.500  0.115  1.0
  Fe  Fe7  1  0.516  0.006  0.505  1.0
  Fe  Fe8  1  0.682  0.500  0.841  1.0
  O  O9  1  0.754  0.040  0.238  1.0
  O  O10  1  0.265  0.015  0.253  1.0
  O  O11  1  0.828  0.500  0.139  1.0
  O  O12  1  0.147  0.699  0.224  1.0
  O  O13  1  0.346  0.301  0.423  1.0
  O  O14  1  0.932  0.303  0.781  1.0
  O  O15  1  0.735  0.697  0.584  1.0
  O  O16  1  0.328  0.500  0.816  1.0
  O  O17  1  0.295  0.960  0.778  1.0
  O  O18  1  0.780  0.985  0.767  1.0
[/CIF]
.
The material structure described by Na4Mg(Fe2O5)2 crystallizes in the monoclinic Cm space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 8-coordinate geometry to one O(3), one O(5), two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms. In the second Na site, Na(2) is bonded in a 7-coordinate geometry to one O(4), one O(5), one O(6), two equivalent O(1), and two equivalent O(2) atoms. Mg(1) is bonded to one O(6), two equivalent O(4), and two equivalent O(5) atoms to form distorted MgO5 square pyramids that share corners with four equivalent Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O4 tetrahedra,  a cornercorner with one Fe(3)O4 tetrahedra,  an edgeedge with one Fe(2)O4 tetrahedra, and  an edgeedge with one Fe(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 35-38°. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(4), one O(5), two equivalent O(1), and two equivalent O(2) atoms to form FeO6 octahedra that share corners with four equivalent Fe(1)O6 octahedra, corners with two equivalent Mg(1)O5 square pyramids,  a cornercorner with one Fe(2)O4 tetrahedra, and  a cornercorner with one Fe(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 6-16°. In the second Fe site, Fe(2) is bonded to one O(3), one O(6), and two equivalent O(4) atoms to form distorted FeO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra,  a cornercorner with one Mg(1)O5 square pyramid, corners with two equivalent Fe(3)O4 tetrahedra, and  an edgeedge with one Mg(1)O5 square pyramid. The corner-sharing octahedral tilt angles are 51°. In the third Fe site, Fe(3) is bonded to one O(3), one O(6), and two equivalent O(5) atoms to form FeO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra,  a cornercorner with one Mg(1)O5 square pyramid, corners with two equivalent Fe(2)O4 tetrahedra, and  an edgeedge with one Mg(1)O5 square pyramid. The corner-sharing octahedral tilt angles are 56°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to two equivalent Na(1), two equivalent Na(2), and two equivalent Fe(1) atoms. In the second O site, O(2) is bonded to two equivalent Na(1), two equivalent Na(2), and two equivalent Fe(1) atoms to form distorted ONa4Fe2 octahedra that share corners with two equivalent O(2)Na4Fe2 octahedra, corners with two equivalent O(3)Na2Fe2 tetrahedra, corners with two equivalent O(6)Na2MgFe2 trigonal bipyramids, and edges with two equivalent O(2)Na4Fe2 octahedra. The corner-sharing octahedral tilt angles are 3°. In the third O site, O(3) is bonded to two equivalent Na(1), one Fe(2), and one Fe(3) atom to form ONa2Fe2 tetrahedra that share corners with four equivalent O(2)Na4Fe2 octahedra and corners with two equivalent O(6)Na2MgFe2 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 22-83°. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Na(2), two equivalent Na(1), one Mg(1), one Fe(1), and one Fe(2) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Mg(1), one Fe(1), and one Fe(3) atom. In the sixth O site, O(6) is bonded to two equivalent Na(2), one Mg(1), one Fe(2), and one Fe(3) atom to form distorted ONa2MgFe2 trigonal bipyramids that share corners with four equivalent O(2)Na4Fe2 octahedra and corners with two equivalent O(3)Na2Fe2 tetrahedra. The corner-sharing octahedral tilt angles range from 54-66°. is represented by the CIF card [CIF]
data_Na4Mg(Fe2O5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.455
_cell_length_b   8.121
_cell_length_c   5.749
_cell_angle_alpha   69.272
_cell_angle_beta   89.996
_cell_angle_gamma   70.360
_symmetry_Int_Tables_number   1
_cell_volume   222.253
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Na  Na0  1  0.604  0.782  0.154  1.0
  Na  Na1  1  0.885  0.219  0.436  1.0
  Na  Na2  1  0.429  0.176  0.896  1.0
  Na  Na3  1  0.106  0.824  0.572  1.0
  Mg  Mg4  1  0.081  0.500  0.551  1.0
  Fe  Fe5  1  0.023  0.993  0.011  1.0
  Fe  Fe6  1  0.180  0.500  0.115  1.0
  Fe  Fe7  1  0.516  0.006  0.505  1.0
  Fe  Fe8  1  0.682  0.500  0.841  1.0
  O  O9  1  0.754  0.040  0.238  1.0
  O  O10  1  0.265  0.015  0.253  1.0
  O  O11  1  0.828  0.500  0.139  1.0
  O  O12  1  0.147  0.699  0.224  1.0
  O  O13  1  0.346  0.301  0.423  1.0
  O  O14  1  0.932  0.303  0.781  1.0
  O  O15  1  0.735  0.697  0.584  1.0
  O  O16  1  0.328  0.500  0.816  1.0
  O  O17  1  0.295  0.960  0.778  1.0
  O  O18  1  0.780  0.985  0.767  1.0
[/CIF]
.