The crystal structure described by Sr4MgFe4O11 is Orthorhombic Perovskite-derived structured and crystallizes in the monoclinic Cm space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one Mg(1), one O(5), two equivalent O(1), two equivalent O(4), and two equivalent O(6) atoms. In the second Sr site, Sr(2) 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(7) atoms. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to one O(7), 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 12-coordinate geometry to one O(6), one O(7), two equivalent O(1), two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. Mg(1) is bonded in a distorted square co-planar geometry to one Sr(1), two equivalent O(2), and two equivalent O(3) atoms. There are two 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), one O(6), and one O(7) atom to form corner-sharing FeO6 octahedra. The corner-sharing octahedral tilt angles range from 19-31°. In the second Fe site, Fe(2) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(4), and one O(5) atom. There are seven inequivalent O sites. In the first O site, O(1) 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(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(3), one Sr(4), one Mg(1), one Fe(1), and one Fe(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(3), one Sr(4), one Mg(1), one Fe(1), and one Fe(2) 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(1), and one Fe(2) atom. In the fifth O site, O(5) is bonded to one Sr(1), one Sr(2), two equivalent Sr(4), and two equivalent Fe(2) atoms to form distorted OSr4Fe2 octahedra that share corners with two equivalent O(5)Sr4Fe2 octahedra and edges with two equivalent O(6)Sr3Fe2 trigonal bipyramids. The corner-sharing octahedral tilt angles are 6°. In the sixth O site, O(6) is bonded to one Sr(4), two equivalent Sr(1), and two equivalent Fe(1) atoms to form distorted OSr3Fe2 trigonal bipyramids that share corners with two equivalent O(6)Sr3Fe2 trigonal bipyramids and edges with two equivalent O(5)Sr4Fe2 octahedra. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to one Sr(3), one Sr(4), two equivalent Sr(2), and two equivalent Fe(1) atoms. is represented by the CIF file [CIF]
data_Sr4MgFe4O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.583
_cell_length_b   7.131
_cell_length_c   7.131
_cell_angle_alpha   112.678
_cell_angle_beta   89.958
_cell_angle_gamma   90.037
_symmetry_Int_Tables_number   1
_cell_volume   261.954
_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  1.000  0.690  0.310  1.0
  Sr  Sr1  1  1.000  0.255  0.745  1.0
  Sr  Sr2  1  0.501  0.028  0.972  1.0
  Sr  Sr3  1  0.500  0.497  0.503  1.0
  Mg  Mg4  1  0.002  0.895  0.104  1.0
  Fe  Fe5  1  0.500  0.996  0.482  1.0
  Fe  Fe6  1  0.500  0.518  0.004  1.0
  Fe  Fe7  1  1.000  0.270  0.253  1.0
  Fe  Fe8  1  1.000  0.747  0.730  1.0
  O  O9  1  0.238  0.903  0.644  1.0
  O  O10  1  0.238  0.079  0.301  1.0
  O  O11  1  0.764  0.700  0.923  1.0
  O  O12  1  0.760  0.357  0.099  1.0
  O  O13  1  0.764  0.077  0.301  1.0
  O  O14  1  0.760  0.901  0.643  1.0
  O  O15  1  0.239  0.356  0.097  1.0
  O  O16  1  0.238  0.699  0.921  1.0
  O  O17  1  0.001  0.485  0.515  1.0
  O  O18  1  0.497  0.713  0.287  1.0
  O  O19  1  0.501  0.287  0.713  1.0
[/CIF]
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The crystal structure described by Sr4MgFe4O11 is Orthorhombic Perovskite-derived structured and crystallizes in the monoclinic Cm space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one Mg(1), one O(5), two equivalent O(1), two equivalent O(4), and two equivalent O(6) atoms. In the second Sr site, Sr(2) 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(7) atoms. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to one O(7), 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 12-coordinate geometry to one O(6), one O(7), two equivalent O(1), two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. Mg(1) is bonded in a distorted square co-planar geometry to one Sr(1), two equivalent O(2), and two equivalent O(3) atoms. There are two 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), one O(6), and one O(7) atom to form corner-sharing FeO6 octahedra. The corner-sharing octahedral tilt angles range from 19-31°. In the second Fe site, Fe(2) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(4), and one O(5) atom. There are seven inequivalent O sites. In the first O site, O(1) 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(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(3), one Sr(4), one Mg(1), one Fe(1), and one Fe(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(3), one Sr(4), one Mg(1), one Fe(1), and one Fe(2) 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(1), and one Fe(2) atom. In the fifth O site, O(5) is bonded to one Sr(1), one Sr(2), two equivalent Sr(4), and two equivalent Fe(2) atoms to form distorted OSr4Fe2 octahedra that share corners with two equivalent O(5)Sr4Fe2 octahedra and edges with two equivalent O(6)Sr3Fe2 trigonal bipyramids. The corner-sharing octahedral tilt angles are 6°. In the sixth O site, O(6) is bonded to one Sr(4), two equivalent Sr(1), and two equivalent Fe(1) atoms to form distorted OSr3Fe2 trigonal bipyramids that share corners with two equivalent O(6)Sr3Fe2 trigonal bipyramids and edges with two equivalent O(5)Sr4Fe2 octahedra. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to one Sr(3), one Sr(4), two equivalent Sr(2), and two equivalent Fe(1) atoms. is represented by the CIF file [CIF]
data_Sr4MgFe4O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.583
_cell_length_b   7.131
_cell_length_c   7.131
_cell_angle_alpha   112.678
_cell_angle_beta   89.958
_cell_angle_gamma   90.037
_symmetry_Int_Tables_number   1
_cell_volume   261.954
_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  1.000  0.690  0.310  1.0
  Sr  Sr1  1  1.000  0.255  0.745  1.0
  Sr  Sr2  1  0.501  0.028  0.972  1.0
  Sr  Sr3  1  0.500  0.497  0.503  1.0
  Mg  Mg4  1  0.002  0.895  0.104  1.0
  Fe  Fe5  1  0.500  0.996  0.482  1.0
  Fe  Fe6  1  0.500  0.518  0.004  1.0
  Fe  Fe7  1  1.000  0.270  0.253  1.0
  Fe  Fe8  1  1.000  0.747  0.730  1.0
  O  O9  1  0.238  0.903  0.644  1.0
  O  O10  1  0.238  0.079  0.301  1.0
  O  O11  1  0.764  0.700  0.923  1.0
  O  O12  1  0.760  0.357  0.099  1.0
  O  O13  1  0.764  0.077  0.301  1.0
  O  O14  1  0.760  0.901  0.643  1.0
  O  O15  1  0.239  0.356  0.097  1.0
  O  O16  1  0.238  0.699  0.921  1.0
  O  O17  1  0.001  0.485  0.515  1.0
  O  O18  1  0.497  0.713  0.287  1.0
  O  O19  1  0.501  0.287  0.713  1.0
[/CIF]
.