The material structure described by La2SrFe2O7 crystallizes in the tetragonal I4mm space group. Sr(1) is bonded in a 9-coordinate geometry to one O(3), four equivalent O(2), and four equivalent O(4) atoms. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 9-coordinate geometry to one O(4), four equivalent O(1), and four equivalent O(3) atoms. In the second La site, La(2) is bonded to four equivalent O(1), four equivalent O(2), and four equivalent O(5) atoms to form LaO12 cuboctahedra that share corners with four equivalent La(2)O12 cuboctahedra, faces with four equivalent La(2)O12 cuboctahedra, faces with four equivalent Fe(1)O6 octahedra, and faces with four equivalent Fe(2)O6 octahedra. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(3), one O(5), and four equivalent O(1) atoms to form FeO6 octahedra that share  a cornercorner with one Fe(2)O6 octahedra, corners with four equivalent Fe(1)O6 octahedra, and faces with four equivalent La(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the second Fe site, Fe(2) is bonded to one O(4), one O(5), and four equivalent O(2) atoms to form FeO6 octahedra that share  a cornercorner with one Fe(1)O6 octahedra, corners with four equivalent Fe(2)O6 octahedra, and faces with four equivalent La(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-9°. There are five inequivalent O sites. In the first O site, O(1) is bonded to two equivalent La(1), two equivalent La(2), and two equivalent Fe(1) atoms to form distorted OLa4Fe2 octahedra that share corners with two equivalent O(1)La4Fe2 octahedra, corners with two equivalent O(4)Sr4LaFe octahedra, corners with four equivalent O(5)La4Fe2 octahedra, corners with four equivalent O(3)SrLa4Fe octahedra, corners with six equivalent O(2)Sr2La2Fe2 octahedra,  an edgeedge with one O(2)Sr2La2Fe2 octahedra, edges with two equivalent O(1)La4Fe2 octahedra, faces with two equivalent O(5)La4Fe2 octahedra, faces with two equivalent O(3)SrLa4Fe octahedra, and faces with four equivalent O(1)La4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 2-63°. In the second O site, O(2) is bonded to two equivalent Sr(1), two equivalent La(2), and two equivalent Fe(2) atoms to form distorted OSr2La2Fe2 octahedra that share corners with two equivalent O(2)Sr2La2Fe2 octahedra, corners with two equivalent O(3)SrLa4Fe octahedra, corners with four equivalent O(5)La4Fe2 octahedra, corners with four equivalent O(4)Sr4LaFe octahedra, corners with six equivalent O(1)La4Fe2 octahedra,  an edgeedge with one O(1)La4Fe2 octahedra, edges with two equivalent O(2)Sr2La2Fe2 octahedra, faces with two equivalent O(5)La4Fe2 octahedra, faces with two equivalent O(4)Sr4LaFe octahedra, and faces with four equivalent O(2)Sr2La2Fe2 octahedra. The corner-sharing octahedral tilt angles range from 5-60°. In the third O site, O(3) is bonded to one Sr(1), four equivalent La(1), and one Fe(1) atom to form distorted OSrLa4Fe octahedra that share  a cornercorner with one O(5)La4Fe2 octahedra, corners with four equivalent O(2)Sr2La2Fe2 octahedra, corners with four equivalent O(3)SrLa4Fe octahedra, corners with eight equivalent O(1)La4Fe2 octahedra, edges with four equivalent O(4)Sr4LaFe octahedra, edges with four equivalent O(3)SrLa4Fe octahedra, and faces with four equivalent O(1)La4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-52°. In the fourth O site, O(4) is bonded to four equivalent Sr(1), one La(1), and one Fe(2) atom to form distorted OSr4LaFe octahedra that share  a cornercorner with one O(5)La4Fe2 octahedra, corners with four equivalent O(1)La4Fe2 octahedra, corners with four equivalent O(4)Sr4LaFe octahedra, corners with eight equivalent O(2)Sr2La2Fe2 octahedra, edges with four equivalent O(4)Sr4LaFe octahedra, edges with four equivalent O(3)SrLa4Fe octahedra, and faces with four equivalent O(2)Sr2La2Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-52°. In the fifth O site, O(5) is bonded to four equivalent La(2), one Fe(1), and one Fe(2) atom to form distorted OLa4Fe2 octahedra that share  a cornercorner with one O(4)Sr4LaFe octahedra,  a cornercorner with one O(3)SrLa4Fe octahedra, corners with four equivalent O(5)La4Fe2 octahedra, corners with eight equivalent O(1)La4Fe2 octahedra, corners with eight equivalent O(2)Sr2La2Fe2 octahedra, edges with four equivalent O(5)La4Fe2 octahedra, faces with four equivalent O(1)La4Fe2 octahedra, and faces with four equivalent O(2)Sr2La2Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-63°. is represented by the CIF file [CIF]
data_SrLa2Fe2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.610
_cell_length_b   10.610
_cell_length_c   10.610
_cell_angle_alpha   158.525
_cell_angle_beta   158.525
_cell_angle_gamma   30.553
_symmetry_Int_Tables_number   1
_cell_volume   159.968
_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  0.683  0.683  0.000  1.0
  La  La1  1  0.318  0.318  0.000  1.0
  La  La2  1  0.505  0.505  0.000  1.0
  Fe  Fe3  1  0.903  0.903  0.000  1.0
  Fe  Fe4  1  0.101  0.101  0.000  1.0
  O  O5  1  0.901  0.401  0.500  1.0
  O  O6  1  0.401  0.901  0.500  1.0
  O  O7  1  0.093  0.593  0.500  1.0
  O  O8  1  0.593  0.093  0.500  1.0
  O  O9  1  0.801  0.801  0.000  1.0
  O  O10  1  0.203  0.203  0.000  1.0
  O  O11  1  1.000  1.000  0.000  1.0
[/CIF]
.
The material structure described by La2SrFe2O7 crystallizes in the tetragonal I4mm space group. Sr(1) is bonded in a 9-coordinate geometry to one O(3), four equivalent O(2), and four equivalent O(4) atoms. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 9-coordinate geometry to one O(4), four equivalent O(1), and four equivalent O(3) atoms. In the second La site, La(2) is bonded to four equivalent O(1), four equivalent O(2), and four equivalent O(5) atoms to form LaO12 cuboctahedra that share corners with four equivalent La(2)O12 cuboctahedra, faces with four equivalent La(2)O12 cuboctahedra, faces with four equivalent Fe(1)O6 octahedra, and faces with four equivalent Fe(2)O6 octahedra. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(3), one O(5), and four equivalent O(1) atoms to form FeO6 octahedra that share  a cornercorner with one Fe(2)O6 octahedra, corners with four equivalent Fe(1)O6 octahedra, and faces with four equivalent La(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the second Fe site, Fe(2) is bonded to one O(4), one O(5), and four equivalent O(2) atoms to form FeO6 octahedra that share  a cornercorner with one Fe(1)O6 octahedra, corners with four equivalent Fe(2)O6 octahedra, and faces with four equivalent La(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-9°. There are five inequivalent O sites. In the first O site, O(1) is bonded to two equivalent La(1), two equivalent La(2), and two equivalent Fe(1) atoms to form distorted OLa4Fe2 octahedra that share corners with two equivalent O(1)La4Fe2 octahedra, corners with two equivalent O(4)Sr4LaFe octahedra, corners with four equivalent O(5)La4Fe2 octahedra, corners with four equivalent O(3)SrLa4Fe octahedra, corners with six equivalent O(2)Sr2La2Fe2 octahedra,  an edgeedge with one O(2)Sr2La2Fe2 octahedra, edges with two equivalent O(1)La4Fe2 octahedra, faces with two equivalent O(5)La4Fe2 octahedra, faces with two equivalent O(3)SrLa4Fe octahedra, and faces with four equivalent O(1)La4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 2-63°. In the second O site, O(2) is bonded to two equivalent Sr(1), two equivalent La(2), and two equivalent Fe(2) atoms to form distorted OSr2La2Fe2 octahedra that share corners with two equivalent O(2)Sr2La2Fe2 octahedra, corners with two equivalent O(3)SrLa4Fe octahedra, corners with four equivalent O(5)La4Fe2 octahedra, corners with four equivalent O(4)Sr4LaFe octahedra, corners with six equivalent O(1)La4Fe2 octahedra,  an edgeedge with one O(1)La4Fe2 octahedra, edges with two equivalent O(2)Sr2La2Fe2 octahedra, faces with two equivalent O(5)La4Fe2 octahedra, faces with two equivalent O(4)Sr4LaFe octahedra, and faces with four equivalent O(2)Sr2La2Fe2 octahedra. The corner-sharing octahedral tilt angles range from 5-60°. In the third O site, O(3) is bonded to one Sr(1), four equivalent La(1), and one Fe(1) atom to form distorted OSrLa4Fe octahedra that share  a cornercorner with one O(5)La4Fe2 octahedra, corners with four equivalent O(2)Sr2La2Fe2 octahedra, corners with four equivalent O(3)SrLa4Fe octahedra, corners with eight equivalent O(1)La4Fe2 octahedra, edges with four equivalent O(4)Sr4LaFe octahedra, edges with four equivalent O(3)SrLa4Fe octahedra, and faces with four equivalent O(1)La4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-52°. In the fourth O site, O(4) is bonded to four equivalent Sr(1), one La(1), and one Fe(2) atom to form distorted OSr4LaFe octahedra that share  a cornercorner with one O(5)La4Fe2 octahedra, corners with four equivalent O(1)La4Fe2 octahedra, corners with four equivalent O(4)Sr4LaFe octahedra, corners with eight equivalent O(2)Sr2La2Fe2 octahedra, edges with four equivalent O(4)Sr4LaFe octahedra, edges with four equivalent O(3)SrLa4Fe octahedra, and faces with four equivalent O(2)Sr2La2Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-52°. In the fifth O site, O(5) is bonded to four equivalent La(2), one Fe(1), and one Fe(2) atom to form distorted OLa4Fe2 octahedra that share  a cornercorner with one O(4)Sr4LaFe octahedra,  a cornercorner with one O(3)SrLa4Fe octahedra, corners with four equivalent O(5)La4Fe2 octahedra, corners with eight equivalent O(1)La4Fe2 octahedra, corners with eight equivalent O(2)Sr2La2Fe2 octahedra, edges with four equivalent O(5)La4Fe2 octahedra, faces with four equivalent O(1)La4Fe2 octahedra, and faces with four equivalent O(2)Sr2La2Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-63°. is represented by the CIF file [CIF]
data_SrLa2Fe2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.610
_cell_length_b   10.610
_cell_length_c   10.610
_cell_angle_alpha   158.525
_cell_angle_beta   158.525
_cell_angle_gamma   30.553
_symmetry_Int_Tables_number   1
_cell_volume   159.968
_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  0.683  0.683  0.000  1.0
  La  La1  1  0.318  0.318  0.000  1.0
  La  La2  1  0.505  0.505  0.000  1.0
  Fe  Fe3  1  0.903  0.903  0.000  1.0
  Fe  Fe4  1  0.101  0.101  0.000  1.0
  O  O5  1  0.901  0.401  0.500  1.0
  O  O6  1  0.401  0.901  0.500  1.0
  O  O7  1  0.093  0.593  0.500  1.0
  O  O8  1  0.593  0.093  0.500  1.0
  O  O9  1  0.801  0.801  0.000  1.0
  O  O10  1  0.203  0.203  0.000  1.0
  O  O11  1  1.000  1.000  0.000  1.0
[/CIF]
.