The crystal structure described by Sr4MgMn4O10 crystallizes in the monoclinic Cm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(4), one O(5), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(6), two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Mg(1) is bonded to one O(5), one O(6), and two equivalent O(4) atoms to form distorted MgO4 tetrahedra that share corners with two equivalent Mn(2)O4 tetrahedra, corners with two equivalent Mn(3)O4 tetrahedra, and  an edgeedge with one Mn(3)O4 tetrahedra. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(3), two equivalent O(1), and two equivalent O(2) atoms to form distorted MnO5 square pyramids that share corners with four equivalent Mn(1)O5 square pyramids and  a cornercorner with one Mn(2)O4 tetrahedra. In the second Mn site, Mn(2) is bonded to one O(5), one O(6), and two equivalent O(3) atoms to form distorted MnO4 tetrahedra that share corners with two equivalent Mn(1)O5 square pyramids, corners with two equivalent Mg(1)O4 tetrahedra, and corners with two equivalent Mn(3)O4 tetrahedra. In the third Mn site, Mn(3) is bonded to one O(5), one O(6), and two equivalent O(4) atoms to form distorted MnO4 tetrahedra that share corners with two equivalent Mg(1)O4 tetrahedra, corners with two equivalent Mn(2)O4 tetrahedra, and  an edgeedge with one Mg(1)O4 tetrahedra. There are six inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Mn(1) atoms to form distorted OSr4Mn2 octahedra that share corners with two equivalent O(1)Sr4Mn2 octahedra, corners with two equivalent O(6)Sr2MgMn2 square pyramids, corners with two equivalent O(5)Sr2MgMn2 trigonal bipyramids, edges with two equivalent O(1)Sr4Mn2 octahedra, and faces with four equivalent O(2)Sr4Mn2 octahedra. The corner-sharing octahedral tilt angles are 7°. In the second O site, O(2) is bonded to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Mn(1) atoms to form OSr4Mn2 octahedra that share corners with two equivalent O(2)Sr4Mn2 octahedra, corners with two equivalent O(6)Sr2MgMn2 square pyramids, corners with two equivalent O(5)Sr2MgMn2 trigonal bipyramids, edges with two equivalent O(2)Sr4Mn2 octahedra, and faces with four equivalent O(1)Sr4Mn2 octahedra. The corner-sharing octahedral tilt angles are 7°. In the third O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), one Mn(1), and one Mn(2) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one Sr(1), two equivalent Sr(2), one Mg(1), and one Mn(3) atom. In the fifth O site, O(5) is bonded to two equivalent Sr(1), one Mg(1), one Mn(2), and one Mn(3) atom to form OSr2MgMn2 trigonal bipyramids that share corners with four equivalent O(1)Sr4Mn2 octahedra, corners with four equivalent O(2)Sr4Mn2 octahedra, and corners with three equivalent O(6)Sr2MgMn2 square pyramids. The corner-sharing octahedral tilt angles range from 38-59°. In the sixth O site, O(6) is bonded to two equivalent Sr(2), one Mg(1), one Mn(2), and one Mn(3) atom to form OSr2MgMn2 square pyramids that share corners with four equivalent O(1)Sr4Mn2 octahedra, corners with four equivalent O(2)Sr4Mn2 octahedra, and corners with three equivalent O(5)Sr2MgMn2 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 42-55°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr4MgMn4O10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.596
_cell_length_b   5.606
_cell_length_c   9.395
_cell_angle_alpha   106.797
_cell_angle_beta   106.770
_cell_angle_gamma   91.803
_symmetry_Int_Tables_number   1
_cell_volume   268.025
_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  0.627  0.120  0.209  1.0
  Sr  Sr1  1  0.417  0.904  0.798  1.0
  Sr  Sr2  1  0.119  0.606  0.202  1.0
  Sr  Sr3  1  0.918  0.412  0.791  1.0
  Mg  Mg4  1  0.984  0.577  0.500  1.0
  Mn  Mn5  1  0.030  0.009  0.015  1.0
  Mn  Mn6  1  0.515  0.494  0.985  1.0
  Mn  Mn7  1  0.203  0.141  0.500  1.0
  Mn  Mn8  1  0.659  0.888  0.500  1.0
  O  O9  1  0.275  0.257  0.007  1.0
  O  O10  1  0.278  0.754  0.005  1.0
  O  O11  1  0.772  0.249  0.994  1.0
  O  O12  1  0.768  0.750  0.992  1.0
  O  O13  1  0.153  0.119  0.278  1.0
  O  O14  1  0.915  0.809  0.686  1.0
  O  O15  1  0.729  0.623  0.314  1.0
  O  O16  1  0.375  0.342  0.722  1.0
  O  O17  1  0.853  0.230  0.500  1.0
  O  O18  1  0.296  0.787  0.500  1.0
[/CIF]
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The crystal structure described by Sr4MgMn4O10 crystallizes in the monoclinic Cm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(4), one O(5), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(6), two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Mg(1) is bonded to one O(5), one O(6), and two equivalent O(4) atoms to form distorted MgO4 tetrahedra that share corners with two equivalent Mn(2)O4 tetrahedra, corners with two equivalent Mn(3)O4 tetrahedra, and  an edgeedge with one Mn(3)O4 tetrahedra. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(3), two equivalent O(1), and two equivalent O(2) atoms to form distorted MnO5 square pyramids that share corners with four equivalent Mn(1)O5 square pyramids and  a cornercorner with one Mn(2)O4 tetrahedra. In the second Mn site, Mn(2) is bonded to one O(5), one O(6), and two equivalent O(3) atoms to form distorted MnO4 tetrahedra that share corners with two equivalent Mn(1)O5 square pyramids, corners with two equivalent Mg(1)O4 tetrahedra, and corners with two equivalent Mn(3)O4 tetrahedra. In the third Mn site, Mn(3) is bonded to one O(5), one O(6), and two equivalent O(4) atoms to form distorted MnO4 tetrahedra that share corners with two equivalent Mg(1)O4 tetrahedra, corners with two equivalent Mn(2)O4 tetrahedra, and  an edgeedge with one Mg(1)O4 tetrahedra. There are six inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Mn(1) atoms to form distorted OSr4Mn2 octahedra that share corners with two equivalent O(1)Sr4Mn2 octahedra, corners with two equivalent O(6)Sr2MgMn2 square pyramids, corners with two equivalent O(5)Sr2MgMn2 trigonal bipyramids, edges with two equivalent O(1)Sr4Mn2 octahedra, and faces with four equivalent O(2)Sr4Mn2 octahedra. The corner-sharing octahedral tilt angles are 7°. In the second O site, O(2) is bonded to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Mn(1) atoms to form OSr4Mn2 octahedra that share corners with two equivalent O(2)Sr4Mn2 octahedra, corners with two equivalent O(6)Sr2MgMn2 square pyramids, corners with two equivalent O(5)Sr2MgMn2 trigonal bipyramids, edges with two equivalent O(2)Sr4Mn2 octahedra, and faces with four equivalent O(1)Sr4Mn2 octahedra. The corner-sharing octahedral tilt angles are 7°. In the third O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), one Mn(1), and one Mn(2) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one Sr(1), two equivalent Sr(2), one Mg(1), and one Mn(3) atom. In the fifth O site, O(5) is bonded to two equivalent Sr(1), one Mg(1), one Mn(2), and one Mn(3) atom to form OSr2MgMn2 trigonal bipyramids that share corners with four equivalent O(1)Sr4Mn2 octahedra, corners with four equivalent O(2)Sr4Mn2 octahedra, and corners with three equivalent O(6)Sr2MgMn2 square pyramids. The corner-sharing octahedral tilt angles range from 38-59°. In the sixth O site, O(6) is bonded to two equivalent Sr(2), one Mg(1), one Mn(2), and one Mn(3) atom to form OSr2MgMn2 square pyramids that share corners with four equivalent O(1)Sr4Mn2 octahedra, corners with four equivalent O(2)Sr4Mn2 octahedra, and corners with three equivalent O(5)Sr2MgMn2 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 42-55°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr4MgMn4O10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.596
_cell_length_b   5.606
_cell_length_c   9.395
_cell_angle_alpha   106.797
_cell_angle_beta   106.770
_cell_angle_gamma   91.803
_symmetry_Int_Tables_number   1
_cell_volume   268.025
_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  0.627  0.120  0.209  1.0
  Sr  Sr1  1  0.417  0.904  0.798  1.0
  Sr  Sr2  1  0.119  0.606  0.202  1.0
  Sr  Sr3  1  0.918  0.412  0.791  1.0
  Mg  Mg4  1  0.984  0.577  0.500  1.0
  Mn  Mn5  1  0.030  0.009  0.015  1.0
  Mn  Mn6  1  0.515  0.494  0.985  1.0
  Mn  Mn7  1  0.203  0.141  0.500  1.0
  Mn  Mn8  1  0.659  0.888  0.500  1.0
  O  O9  1  0.275  0.257  0.007  1.0
  O  O10  1  0.278  0.754  0.005  1.0
  O  O11  1  0.772  0.249  0.994  1.0
  O  O12  1  0.768  0.750  0.992  1.0
  O  O13  1  0.153  0.119  0.278  1.0
  O  O14  1  0.915  0.809  0.686  1.0
  O  O15  1  0.729  0.623  0.314  1.0
  O  O16  1  0.375  0.342  0.722  1.0
  O  O17  1  0.853  0.230  0.500  1.0
  O  O18  1  0.296  0.787  0.500  1.0
[/CIF]
.