The crystal structure described by Sr2Mn2O5 crystallizes in the triclinic P1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(1), one O(3), one O(4), one O(5), one O(6), two equivalent O(7), and two equivalent O(9) atoms. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(6), two equivalent O(10), and two equivalent O(8) atoms. In the third Sr site, Sr(3) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(6), two equivalent O(7), and two equivalent O(9) atoms. In the fourth Sr site, Sr(4) is bonded in a 9-coordinate geometry to one O(1), one O(3), one O(4), one O(5), one O(6), two equivalent O(10), and two equivalent O(8) atoms. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(10), one O(2), and one O(7) atom to form MnO4 tetrahedra that share  a cornercorner with one Mn(3)O6 octahedra,  a cornercorner with one Mn(4)O6 octahedra, and corners with two equivalent Mn(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 15-18°. In the second Mn site, Mn(2) is bonded to one O(1), one O(2), one O(8), and one O(9) atom to form MnO4 tetrahedra that share  a cornercorner with one Mn(3)O6 octahedra,  a cornercorner with one Mn(4)O6 octahedra, and corners with two equivalent Mn(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 15-18°. In the third Mn site, Mn(3) is bonded to one O(10), one O(3), one O(4), one O(5), one O(6), and one O(9) atom to form MnO6 octahedra that share corners with four equivalent Mn(4)O6 octahedra,  a cornercorner with one Mn(1)O4 tetrahedra, and  a cornercorner with one Mn(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 2°. In the fourth Mn site, Mn(4) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form MnO6 octahedra that share corners with four equivalent Mn(3)O6 octahedra,  a cornercorner with one Mn(1)O4 tetrahedra, and  a cornercorner with one Mn(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 2°. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one Sr(1), one Sr(4), one Mn(1), and one Mn(2) atom to form distorted OSr2Mn2 tetrahedra that share corners with two equivalent O(3)Sr4Mn2 octahedra, corners with two equivalent O(4)Sr4Mn2 octahedra, corners with two equivalent O(5)Sr4Mn2 octahedra, corners with two equivalent O(6)Sr4Mn2 octahedra, and corners with two equivalent O(2)Sr2Mn2 tetrahedra. The corner-sharing octahedral tilt angles range from 26-66°. In the second O site, O(2) is bonded to one Sr(2), one Sr(3), one Mn(1), and one Mn(2) atom to form distorted OSr2Mn2 tetrahedra that share corners with two equivalent O(3)Sr4Mn2 octahedra, corners with two equivalent O(4)Sr4Mn2 octahedra, corners with two equivalent O(5)Sr4Mn2 octahedra, corners with two equivalent O(6)Sr4Mn2 octahedra, and corners with two equivalent O(1)Sr2Mn2 tetrahedra. The corner-sharing octahedral tilt angles range from 26-66°. In the third O site, O(3) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Mn(3), and one Mn(4) atom to form distorted OSr4Mn2 octahedra that share corners with two equivalent O(6)Sr4Mn2 octahedra, corners with two equivalent O(1)Sr2Mn2 tetrahedra, corners with two equivalent O(2)Sr2Mn2 tetrahedra, edges with two equivalent O(6)Sr4Mn2 octahedra, faces with two equivalent O(4)Sr4Mn2 octahedra, and faces with two equivalent O(5)Sr4Mn2 octahedra. The corner-sharing octahedra are not tilted. In the fourth O site, O(4) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Mn(3), and one Mn(4) atom to form distorted OSr4Mn2 octahedra that share corners with two equivalent O(5)Sr4Mn2 octahedra, corners with two equivalent O(1)Sr2Mn2 tetrahedra, corners with two equivalent O(2)Sr2Mn2 tetrahedra, edges with two equivalent O(5)Sr4Mn2 octahedra, faces with two equivalent O(3)Sr4Mn2 octahedra, and faces with two equivalent O(6)Sr4Mn2 octahedra. The corner-sharing octahedra are not tilted. In the fifth O site, O(5) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Mn(3), and one Mn(4) atom to form distorted OSr4Mn2 octahedra that share corners with two equivalent O(4)Sr4Mn2 octahedra, corners with two equivalent O(1)Sr2Mn2 tetrahedra, corners with two equivalent O(2)Sr2Mn2 tetrahedra, edges with two equivalent O(4)Sr4Mn2 octahedra, faces with two equivalent O(3)Sr4Mn2 octahedra, and faces with two equivalent O(6)Sr4Mn2 octahedra. The corner-sharing octahedra are not tilted. In the sixth O site, O(6) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Mn(3), and one Mn(4) atom to form distorted OSr4Mn2 octahedra that share corners with two equivalent O(3)Sr4Mn2 octahedra, corners with two equivalent O(1)Sr2Mn2 tetrahedra, corners with two equivalent O(2)Sr2Mn2 tetrahedra, edges with two equivalent O(3)Sr4Mn2 octahedra, faces with two equivalent O(4)Sr4Mn2 octahedra, and faces with two equivalent O(5)Sr4Mn2 octahedra. The corner-sharing octahedra are not tilted. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(3), one Mn(1), and one Mn(4) atom. In the eighth O site, O(8) is bonded in a 6-coordinate geometry to two equivalent Sr(2), two equivalent Sr(4), one Mn(2), and one Mn(4) atom. In the ninth O site, O(9) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(3), one Mn(2), and one Mn(3) atom. In the tenth O site, O(10) is bonded in a 6-coordinate geometry to two equivalent Sr(2), two equivalent Sr(4), one Mn(1), and one Mn(3) atom. is represented by the CIF file [CIF]
data_Sr2Mn2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.453
_cell_length_b   5.452
_cell_length_c   9.268
_cell_angle_alpha   107.082
_cell_angle_beta   107.086
_cell_angle_gamma   90.027
_symmetry_Int_Tables_number   1
_cell_volume   250.620
_cell_formula_units_Z   2
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  0.621  0.117  0.221  1.0
  Sr  Sr1  1  0.400  0.883  0.779  1.0
  Sr  Sr2  1  0.120  0.605  0.221  1.0
  Sr  Sr3  1  0.899  0.395  0.779  1.0
  Mn  Mn4  1  0.219  0.188  0.500  1.0
  Mn  Mn5  1  0.720  0.812  0.500  1.0
  Mn  Mn6  1  0.509  0.500  0.000  1.0
  Mn  Mn7  1  0.010  1.000  0.000  1.0
  O  O8  1  0.866  0.153  0.500  1.0
  O  O9  1  0.367  0.849  0.500  1.0
  O  O10  1  0.256  0.249  0.996  1.0
  O  O11  1  0.261  0.751  0.005  1.0
  O  O12  1  0.757  0.247  0.997  1.0
  O  O13  1  0.761  0.752  0.004  1.0
  O  O14  1  0.154  0.150  0.281  1.0
  O  O15  1  0.872  0.849  0.718  1.0
  O  O16  1  0.660  0.623  0.283  1.0
  O  O17  1  0.375  0.375  0.717  1.0
[/CIF]
.
The crystal structure described by Sr2Mn2O5 crystallizes in the triclinic P1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(1), one O(3), one O(4), one O(5), one O(6), two equivalent O(7), and two equivalent O(9) atoms. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(6), two equivalent O(10), and two equivalent O(8) atoms. In the third Sr site, Sr(3) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(6), two equivalent O(7), and two equivalent O(9) atoms. In the fourth Sr site, Sr(4) is bonded in a 9-coordinate geometry to one O(1), one O(3), one O(4), one O(5), one O(6), two equivalent O(10), and two equivalent O(8) atoms. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(10), one O(2), and one O(7) atom to form MnO4 tetrahedra that share  a cornercorner with one Mn(3)O6 octahedra,  a cornercorner with one Mn(4)O6 octahedra, and corners with two equivalent Mn(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 15-18°. In the second Mn site, Mn(2) is bonded to one O(1), one O(2), one O(8), and one O(9) atom to form MnO4 tetrahedra that share  a cornercorner with one Mn(3)O6 octahedra,  a cornercorner with one Mn(4)O6 octahedra, and corners with two equivalent Mn(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 15-18°. In the third Mn site, Mn(3) is bonded to one O(10), one O(3), one O(4), one O(5), one O(6), and one O(9) atom to form MnO6 octahedra that share corners with four equivalent Mn(4)O6 octahedra,  a cornercorner with one Mn(1)O4 tetrahedra, and  a cornercorner with one Mn(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 2°. In the fourth Mn site, Mn(4) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form MnO6 octahedra that share corners with four equivalent Mn(3)O6 octahedra,  a cornercorner with one Mn(1)O4 tetrahedra, and  a cornercorner with one Mn(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 2°. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one Sr(1), one Sr(4), one Mn(1), and one Mn(2) atom to form distorted OSr2Mn2 tetrahedra that share corners with two equivalent O(3)Sr4Mn2 octahedra, corners with two equivalent O(4)Sr4Mn2 octahedra, corners with two equivalent O(5)Sr4Mn2 octahedra, corners with two equivalent O(6)Sr4Mn2 octahedra, and corners with two equivalent O(2)Sr2Mn2 tetrahedra. The corner-sharing octahedral tilt angles range from 26-66°. In the second O site, O(2) is bonded to one Sr(2), one Sr(3), one Mn(1), and one Mn(2) atom to form distorted OSr2Mn2 tetrahedra that share corners with two equivalent O(3)Sr4Mn2 octahedra, corners with two equivalent O(4)Sr4Mn2 octahedra, corners with two equivalent O(5)Sr4Mn2 octahedra, corners with two equivalent O(6)Sr4Mn2 octahedra, and corners with two equivalent O(1)Sr2Mn2 tetrahedra. The corner-sharing octahedral tilt angles range from 26-66°. In the third O site, O(3) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Mn(3), and one Mn(4) atom to form distorted OSr4Mn2 octahedra that share corners with two equivalent O(6)Sr4Mn2 octahedra, corners with two equivalent O(1)Sr2Mn2 tetrahedra, corners with two equivalent O(2)Sr2Mn2 tetrahedra, edges with two equivalent O(6)Sr4Mn2 octahedra, faces with two equivalent O(4)Sr4Mn2 octahedra, and faces with two equivalent O(5)Sr4Mn2 octahedra. The corner-sharing octahedra are not tilted. In the fourth O site, O(4) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Mn(3), and one Mn(4) atom to form distorted OSr4Mn2 octahedra that share corners with two equivalent O(5)Sr4Mn2 octahedra, corners with two equivalent O(1)Sr2Mn2 tetrahedra, corners with two equivalent O(2)Sr2Mn2 tetrahedra, edges with two equivalent O(5)Sr4Mn2 octahedra, faces with two equivalent O(3)Sr4Mn2 octahedra, and faces with two equivalent O(6)Sr4Mn2 octahedra. The corner-sharing octahedra are not tilted. In the fifth O site, O(5) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Mn(3), and one Mn(4) atom to form distorted OSr4Mn2 octahedra that share corners with two equivalent O(4)Sr4Mn2 octahedra, corners with two equivalent O(1)Sr2Mn2 tetrahedra, corners with two equivalent O(2)Sr2Mn2 tetrahedra, edges with two equivalent O(4)Sr4Mn2 octahedra, faces with two equivalent O(3)Sr4Mn2 octahedra, and faces with two equivalent O(6)Sr4Mn2 octahedra. The corner-sharing octahedra are not tilted. In the sixth O site, O(6) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Mn(3), and one Mn(4) atom to form distorted OSr4Mn2 octahedra that share corners with two equivalent O(3)Sr4Mn2 octahedra, corners with two equivalent O(1)Sr2Mn2 tetrahedra, corners with two equivalent O(2)Sr2Mn2 tetrahedra, edges with two equivalent O(3)Sr4Mn2 octahedra, faces with two equivalent O(4)Sr4Mn2 octahedra, and faces with two equivalent O(5)Sr4Mn2 octahedra. The corner-sharing octahedra are not tilted. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(3), one Mn(1), and one Mn(4) atom. In the eighth O site, O(8) is bonded in a 6-coordinate geometry to two equivalent Sr(2), two equivalent Sr(4), one Mn(2), and one Mn(4) atom. In the ninth O site, O(9) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(3), one Mn(2), and one Mn(3) atom. In the tenth O site, O(10) is bonded in a 6-coordinate geometry to two equivalent Sr(2), two equivalent Sr(4), one Mn(1), and one Mn(3) atom. is represented by the CIF file [CIF]
data_Sr2Mn2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.453
_cell_length_b   5.452
_cell_length_c   9.268
_cell_angle_alpha   107.082
_cell_angle_beta   107.086
_cell_angle_gamma   90.027
_symmetry_Int_Tables_number   1
_cell_volume   250.620
_cell_formula_units_Z   2
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  0.621  0.117  0.221  1.0
  Sr  Sr1  1  0.400  0.883  0.779  1.0
  Sr  Sr2  1  0.120  0.605  0.221  1.0
  Sr  Sr3  1  0.899  0.395  0.779  1.0
  Mn  Mn4  1  0.219  0.188  0.500  1.0
  Mn  Mn5  1  0.720  0.812  0.500  1.0
  Mn  Mn6  1  0.509  0.500  0.000  1.0
  Mn  Mn7  1  0.010  1.000  0.000  1.0
  O  O8  1  0.866  0.153  0.500  1.0
  O  O9  1  0.367  0.849  0.500  1.0
  O  O10  1  0.256  0.249  0.996  1.0
  O  O11  1  0.261  0.751  0.005  1.0
  O  O12  1  0.757  0.247  0.997  1.0
  O  O13  1  0.761  0.752  0.004  1.0
  O  O14  1  0.154  0.150  0.281  1.0
  O  O15  1  0.872  0.849  0.718  1.0
  O  O16  1  0.660  0.623  0.283  1.0
  O  O17  1  0.375  0.375  0.717  1.0
[/CIF]
.