The material structure described by Sr4MgFe4O11 crystallizes in the monoclinic Pm space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 11-coordinate geometry to one O(5), two equivalent O(1), two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(6) atoms. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(5), two equivalent O(1), two equivalent O(2), two equivalent O(4), and two equivalent O(7) atoms. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. In the fourth Sr site, Sr(4) is bonded in a 8-coordinate geometry to one O(6), one O(7), two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms. Mg(1) is bonded in a 5-coordinate geometry to one O(7), two equivalent O(1), and two equivalent O(3) atoms. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(6), two equivalent O(1), and two equivalent O(2) atoms to form FeO5 square pyramids that share  a cornercorner with one Fe(2)O6 octahedra, corners with two equivalent Fe(3)O5 trigonal bipyramids, and corners with two equivalent Fe(4)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 27°. In the second Fe site, Fe(2) is bonded to one O(6), one O(7), two equivalent O(3), and two equivalent O(4) atoms to form corner-sharing FeO6 octahedra. In the third Fe site, Fe(3) is bonded to one O(5), two equivalent O(2), and two equivalent O(4) atoms to form distorted FeO5 trigonal bipyramids that share corners with two equivalent Fe(2)O6 octahedra, corners with two equivalent Fe(1)O5 square pyramids, and  a cornercorner with one Fe(4)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 25°. In the fourth Fe site, Fe(4) is bonded to one O(5), two equivalent O(1), and two equivalent O(3) atoms to form distorted FeO5 trigonal bipyramids that share corners with two equivalent Fe(2)O6 octahedra, corners with two equivalent Fe(1)O5 square pyramids, and  a cornercorner with one Fe(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 37°. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Mg(1), one Fe(1), and one Fe(4) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Fe(1), and one Fe(3) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(3), one Mg(1), one Fe(2), and one Fe(4) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Fe(2), and one Fe(3) atom. In the fifth O site, O(5) is bonded to one Sr(1), one Sr(2), two equivalent Sr(4), one Fe(3), and one Fe(4) atom to form distorted corner-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles are 35°. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to one Sr(4), two equivalent Sr(1), one Fe(1), and one Fe(2) atom. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to one Sr(4), two equivalent Sr(2), one Mg(1), and one Fe(2) atom. is represented by the CIF file [CIF]
data_Sr4MgFe4O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.570
_cell_length_b   6.968
_cell_length_c   7.113
_cell_angle_alpha   103.389
_cell_angle_beta   90.006
_cell_angle_gamma   89.990
_symmetry_Int_Tables_number   1
_cell_volume   268.617
_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  0.000  0.744  0.248  1.0
  Sr  Sr1  1  0.000  0.251  0.743  1.0
  Sr  Sr2  1  0.500  0.033  0.032  1.0
  Sr  Sr3  1  0.500  0.391  0.403  1.0
  Mg  Mg4  1  0.500  0.702  0.737  1.0
  Fe  Fe5  1  0.500  0.951  0.467  1.0
  Fe  Fe6  1  0.500  0.513  0.013  1.0
  Fe  Fe7  1  0.000  0.263  0.265  1.0
  Fe  Fe8  1  1.000  0.737  0.740  1.0
  O  O9  1  0.258  0.899  0.661  1.0
  O  O10  1  0.248  0.087  0.341  1.0
  O  O11  1  0.756  0.709  0.939  1.0
  O  O12  1  0.758  0.337  0.089  1.0
  O  O13  1  0.753  0.087  0.341  1.0
  O  O14  1  0.742  0.900  0.661  1.0
  O  O15  1  0.242  0.338  0.089  1.0
  O  O16  1  0.244  0.710  0.939  1.0
  O  O17  1  1.000  0.492  0.506  1.0
  O  O18  1  0.500  0.698  0.292  1.0
  O  O19  1  0.500  0.398  0.734  1.0
[/CIF]
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The material structure described by Sr4MgFe4O11 crystallizes in the monoclinic Pm space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 11-coordinate geometry to one O(5), two equivalent O(1), two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(6) atoms. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(5), two equivalent O(1), two equivalent O(2), two equivalent O(4), and two equivalent O(7) atoms. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. In the fourth Sr site, Sr(4) is bonded in a 8-coordinate geometry to one O(6), one O(7), two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms. Mg(1) is bonded in a 5-coordinate geometry to one O(7), two equivalent O(1), and two equivalent O(3) atoms. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(6), two equivalent O(1), and two equivalent O(2) atoms to form FeO5 square pyramids that share  a cornercorner with one Fe(2)O6 octahedra, corners with two equivalent Fe(3)O5 trigonal bipyramids, and corners with two equivalent Fe(4)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 27°. In the second Fe site, Fe(2) is bonded to one O(6), one O(7), two equivalent O(3), and two equivalent O(4) atoms to form corner-sharing FeO6 octahedra. In the third Fe site, Fe(3) is bonded to one O(5), two equivalent O(2), and two equivalent O(4) atoms to form distorted FeO5 trigonal bipyramids that share corners with two equivalent Fe(2)O6 octahedra, corners with two equivalent Fe(1)O5 square pyramids, and  a cornercorner with one Fe(4)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 25°. In the fourth Fe site, Fe(4) is bonded to one O(5), two equivalent O(1), and two equivalent O(3) atoms to form distorted FeO5 trigonal bipyramids that share corners with two equivalent Fe(2)O6 octahedra, corners with two equivalent Fe(1)O5 square pyramids, and  a cornercorner with one Fe(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 37°. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Mg(1), one Fe(1), and one Fe(4) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Fe(1), and one Fe(3) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(3), one Mg(1), one Fe(2), and one Fe(4) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Fe(2), and one Fe(3) atom. In the fifth O site, O(5) is bonded to one Sr(1), one Sr(2), two equivalent Sr(4), one Fe(3), and one Fe(4) atom to form distorted corner-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles are 35°. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to one Sr(4), two equivalent Sr(1), one Fe(1), and one Fe(2) atom. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to one Sr(4), two equivalent Sr(2), one Mg(1), and one Fe(2) atom. is represented by the CIF file [CIF]
data_Sr4MgFe4O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.570
_cell_length_b   6.968
_cell_length_c   7.113
_cell_angle_alpha   103.389
_cell_angle_beta   90.006
_cell_angle_gamma   89.990
_symmetry_Int_Tables_number   1
_cell_volume   268.617
_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  0.000  0.744  0.248  1.0
  Sr  Sr1  1  0.000  0.251  0.743  1.0
  Sr  Sr2  1  0.500  0.033  0.032  1.0
  Sr  Sr3  1  0.500  0.391  0.403  1.0
  Mg  Mg4  1  0.500  0.702  0.737  1.0
  Fe  Fe5  1  0.500  0.951  0.467  1.0
  Fe  Fe6  1  0.500  0.513  0.013  1.0
  Fe  Fe7  1  0.000  0.263  0.265  1.0
  Fe  Fe8  1  1.000  0.737  0.740  1.0
  O  O9  1  0.258  0.899  0.661  1.0
  O  O10  1  0.248  0.087  0.341  1.0
  O  O11  1  0.756  0.709  0.939  1.0
  O  O12  1  0.758  0.337  0.089  1.0
  O  O13  1  0.753  0.087  0.341  1.0
  O  O14  1  0.742  0.900  0.661  1.0
  O  O15  1  0.242  0.338  0.089  1.0
  O  O16  1  0.244  0.710  0.939  1.0
  O  O17  1  1.000  0.492  0.506  1.0
  O  O18  1  0.500  0.698  0.292  1.0
  O  O19  1  0.500  0.398  0.734  1.0
[/CIF]
.