The material structure described by Sr4Mg(Fe2O5)2 crystallizes in the triclinic P1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(4), one O(7), one O(9), and two equivalent O(5) atoms. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(2), one O(3), one O(4), one O(6), and one O(8) atom. In the third Sr site, Sr(3) is bonded in a 7-coordinate geometry to one O(10), one O(2), one O(3), one O(4), one O(5), and two equivalent O(7) atoms. In the fourth Sr site, Sr(4) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(6), one O(9), and two equivalent O(8) atoms. Mg(1) is bonded to one O(1), one O(10), one O(6), one O(8), and one O(9) atom to form distorted MgO5 trigonal bipyramids that share  a cornercorner with one Fe(4)O4 tetrahedra,  a cornercorner with one Fe(1)O5 trigonal bipyramid,  an edgeedge with one Fe(2)O6 octahedra, and  an edgeedge with one Fe(4)O4 tetrahedra. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(2), one O(3), one O(4), and one O(5) atom to form FeO5 trigonal bipyramids that share corners with four equivalent Fe(2)O6 octahedra and  a cornercorner with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 2-53°. In the second Fe site, Fe(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom to form distorted FeO6 octahedra that share  a cornercorner with one Fe(4)O4 tetrahedra, corners with four equivalent Fe(1)O5 trigonal bipyramids, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. In the third Fe site, Fe(3) is bonded in a 4-coordinate geometry to one O(10), one O(5), one O(8), and one O(9) atom. In the fourth Fe site, Fe(4) is bonded to one O(10), one O(6), one O(7), and one O(9) atom to form FeO4 tetrahedra that share  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 32°. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Sr(2), one Sr(4), one Mg(1), one Fe(1), and one Fe(2) atom. In the second O site, O(2) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Fe(1), and one Fe(2) atom to form a mixture of corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles are 9°. In the third O site, O(3) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Fe(1), and one Fe(2) atom to form a mixture of corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles are 9°. In the fourth O site, O(4) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Fe(1), and one Fe(2) atom to form face-sharing OSr4Fe2 octahedra. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Sr(3), two equivalent Sr(1), one Fe(1), and one Fe(3) atom. In the sixth O site, O(6) is bonded in a distorted see-saw-like geometry to one Sr(2), one Sr(4), one Mg(1), and one Fe(4) atom. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to one Sr(1), two equivalent Sr(3), one Fe(2), and one Fe(4) atom. In the eighth O site, O(8) is bonded in a 6-coordinate geometry to one Sr(2), two equivalent Sr(4), one Mg(1), one Fe(2), and one Fe(3) atom. In the ninth O site, O(9) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(4), one Mg(1), one Fe(3), and one Fe(4) atom. In the tenth O site, O(10) is bonded in a 5-coordinate geometry to one Sr(2), one Sr(3), one Mg(1), one Fe(3), and one Fe(4) atom. is represented by the CIF file [CIF]
data_Sr4Mg(Fe2O5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.662
_cell_length_b   5.897
_cell_length_c   8.992
_cell_angle_alpha   108.841
_cell_angle_beta   106.948
_cell_angle_gamma   83.573
_symmetry_Int_Tables_number   1
_cell_volume   271.769
_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
  Sr  Sr0  1  0.373  0.901  0.765  1.0
  Sr  Sr1  1  0.517  0.023  0.178  1.0
  Sr  Sr2  1  0.926  0.401  0.774  1.0
  Sr  Sr3  1  0.122  0.648  0.203  1.0
  Mg  Mg4  1  0.883  0.364  0.330  1.0
  Fe  Fe5  1  0.960  0.994  0.968  1.0
  Fe  Fe6  1  0.509  0.475  0.989  1.0
  Fe  Fe7  1  0.762  0.775  0.509  1.0
  Fe  Fe8  1  0.358  0.328  0.513  1.0
  O  O9  1  0.775  0.260  0.085  1.0
  O  O10  1  0.743  0.746  0.973  1.0
  O  O11  1  0.216  0.230  0.992  1.0
  O  O12  1  0.225  0.738  0.971  1.0
  O  O13  1  0.829  0.949  0.734  1.0
  O  O14  1  0.158  0.102  0.328  1.0
  O  O15  1  0.381  0.311  0.722  1.0
  O  O16  1  0.629  0.675  0.281  1.0
  O  O17  1  0.140  0.608  0.488  1.0
  O  O18  1  0.674  0.347  0.476  1.0
[/CIF]
.
The material structure described by Sr4Mg(Fe2O5)2 crystallizes in the triclinic P1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(4), one O(7), one O(9), and two equivalent O(5) atoms. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(2), one O(3), one O(4), one O(6), and one O(8) atom. In the third Sr site, Sr(3) is bonded in a 7-coordinate geometry to one O(10), one O(2), one O(3), one O(4), one O(5), and two equivalent O(7) atoms. In the fourth Sr site, Sr(4) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(6), one O(9), and two equivalent O(8) atoms. Mg(1) is bonded to one O(1), one O(10), one O(6), one O(8), and one O(9) atom to form distorted MgO5 trigonal bipyramids that share  a cornercorner with one Fe(4)O4 tetrahedra,  a cornercorner with one Fe(1)O5 trigonal bipyramid,  an edgeedge with one Fe(2)O6 octahedra, and  an edgeedge with one Fe(4)O4 tetrahedra. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(2), one O(3), one O(4), and one O(5) atom to form FeO5 trigonal bipyramids that share corners with four equivalent Fe(2)O6 octahedra and  a cornercorner with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 2-53°. In the second Fe site, Fe(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom to form distorted FeO6 octahedra that share  a cornercorner with one Fe(4)O4 tetrahedra, corners with four equivalent Fe(1)O5 trigonal bipyramids, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. In the third Fe site, Fe(3) is bonded in a 4-coordinate geometry to one O(10), one O(5), one O(8), and one O(9) atom. In the fourth Fe site, Fe(4) is bonded to one O(10), one O(6), one O(7), and one O(9) atom to form FeO4 tetrahedra that share  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 32°. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Sr(2), one Sr(4), one Mg(1), one Fe(1), and one Fe(2) atom. In the second O site, O(2) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Fe(1), and one Fe(2) atom to form a mixture of corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles are 9°. In the third O site, O(3) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Fe(1), and one Fe(2) atom to form a mixture of corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles are 9°. In the fourth O site, O(4) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Fe(1), and one Fe(2) atom to form face-sharing OSr4Fe2 octahedra. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Sr(3), two equivalent Sr(1), one Fe(1), and one Fe(3) atom. In the sixth O site, O(6) is bonded in a distorted see-saw-like geometry to one Sr(2), one Sr(4), one Mg(1), and one Fe(4) atom. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to one Sr(1), two equivalent Sr(3), one Fe(2), and one Fe(4) atom. In the eighth O site, O(8) is bonded in a 6-coordinate geometry to one Sr(2), two equivalent Sr(4), one Mg(1), one Fe(2), and one Fe(3) atom. In the ninth O site, O(9) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(4), one Mg(1), one Fe(3), and one Fe(4) atom. In the tenth O site, O(10) is bonded in a 5-coordinate geometry to one Sr(2), one Sr(3), one Mg(1), one Fe(3), and one Fe(4) atom. is represented by the CIF file [CIF]
data_Sr4Mg(Fe2O5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.662
_cell_length_b   5.897
_cell_length_c   8.992
_cell_angle_alpha   108.841
_cell_angle_beta   106.948
_cell_angle_gamma   83.573
_symmetry_Int_Tables_number   1
_cell_volume   271.769
_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
  Sr  Sr0  1  0.373  0.901  0.765  1.0
  Sr  Sr1  1  0.517  0.023  0.178  1.0
  Sr  Sr2  1  0.926  0.401  0.774  1.0
  Sr  Sr3  1  0.122  0.648  0.203  1.0
  Mg  Mg4  1  0.883  0.364  0.330  1.0
  Fe  Fe5  1  0.960  0.994  0.968  1.0
  Fe  Fe6  1  0.509  0.475  0.989  1.0
  Fe  Fe7  1  0.762  0.775  0.509  1.0
  Fe  Fe8  1  0.358  0.328  0.513  1.0
  O  O9  1  0.775  0.260  0.085  1.0
  O  O10  1  0.743  0.746  0.973  1.0
  O  O11  1  0.216  0.230  0.992  1.0
  O  O12  1  0.225  0.738  0.971  1.0
  O  O13  1  0.829  0.949  0.734  1.0
  O  O14  1  0.158  0.102  0.328  1.0
  O  O15  1  0.381  0.311  0.722  1.0
  O  O16  1  0.629  0.675  0.281  1.0
  O  O17  1  0.140  0.608  0.488  1.0
  O  O18  1  0.674  0.347  0.476  1.0
[/CIF]
.