The structure described by Ba2MgNd2(Fe2O5)2 crystallizes in the monoclinic Pm space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 8-coordinate geometry to one O(4), one O(6), two equivalent O(2), two equivalent O(7), and two equivalent O(9) atoms. In the second Ba site, Ba(2) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(10), two equivalent O(5), and two equivalent O(9) atoms. Mg(1) is bonded to one O(3), one O(6), and two equivalent O(5) atoms to form distorted MgO4 trigonal pyramids that share  a cornercorner with one Nd(1)O6 octahedra, corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Mg(1)O4 trigonal pyramids, and edges with two equivalent Fe(3)O4 trigonal pyramids. The corner-sharing octahedral tilt angles are 44°. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded to one O(3), one O(4), two equivalent O(2), and two equivalent O(7) atoms to form NdO6 octahedra that share corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra,  a cornercorner with one Mg(1)O4 trigonal pyramid, corners with two equivalent Fe(3)O4 trigonal pyramids, corners with two equivalent Fe(4)O4 trigonal pyramids, and edges with two equivalent Nd(1)O6 octahedra. In the second Nd site, Nd(2) is bonded to one O(1), two equivalent O(10), and two equivalent O(8) atoms to form distorted NdO5 square pyramids that share corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, corners with two equivalent Fe(3)O4 trigonal pyramids, corners with two equivalent Fe(4)O4 trigonal pyramids, and edges with two equivalent Nd(2)O5 square pyramids. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(2), one O(8), and two equivalent O(6) atoms to form distorted FeO4 tetrahedra that share corners with two equivalent Nd(1)O6 octahedra, corners with two equivalent Nd(2)O5 square pyramids, corners with two equivalent Fe(1)O4 tetrahedra,  a cornercorner with one Fe(3)O4 trigonal pyramid, and corners with two equivalent Mg(1)O4 trigonal pyramids. The corner-sharing octahedral tilt angles are 65°. In the second Fe site, Fe(2) is bonded to one O(10), one O(9), and two equivalent O(4) atoms to form distorted FeO4 tetrahedra that share corners with two equivalent Nd(1)O6 octahedra, corners with two equivalent Nd(2)O5 square pyramids, corners with two equivalent Fe(2)O4 tetrahedra, and  a cornercorner with one Fe(4)O4 trigonal pyramid. The corner-sharing octahedral tilt angles are 71°. In the third Fe site, Fe(3) is bonded to one O(5), one O(8), and two equivalent O(3) atoms to form FeO4 trigonal pyramids that share corners with two equivalent Nd(1)O6 octahedra, corners with two equivalent Nd(2)O5 square pyramids,  a cornercorner with one Fe(1)O4 tetrahedra, corners with two equivalent Fe(3)O4 trigonal pyramids, and edges with two equivalent Mg(1)O4 trigonal pyramids. The corner-sharing octahedral tilt angles are 71°. In the fourth Fe site, Fe(4) is bonded to one O(7), one O(9), and two equivalent O(1) atoms to form FeO4 trigonal pyramids that share corners with two equivalent Nd(1)O6 octahedra, corners with two equivalent Nd(2)O5 square pyramids,  a cornercorner with one Fe(2)O4 tetrahedra, and corners with two equivalent Fe(4)O4 trigonal pyramids. The corner-sharing octahedral tilt angles are 62°. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one Ba(2), one Nd(2), and two equivalent Fe(4) atoms to form distorted OBaNdFe2 tetrahedra that share corners with two equivalent O(1)BaNdFe2 tetrahedra, corners with two equivalent O(8)Nd2Fe2 tetrahedra, and edges with two equivalent O(9)Ba4Fe2 octahedra. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Ba(1), two equivalent Nd(1), and one Fe(1) atom. In the third O site, O(3) is bonded in a see-saw-like geometry to one Mg(1), one Nd(1), and two equivalent Fe(3) atoms. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ba(1), one Nd(1), and two equivalent Fe(2) atoms. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to two equivalent Ba(2), two equivalent Mg(1), and one Fe(3) atom. In the sixth O site, O(6) is bonded to one Ba(1), one Mg(1), and two equivalent Fe(1) atoms to form distorted OBaMgFe2 trigonal pyramids that share corners with two equivalent O(9)Ba4Fe2 octahedra, corners with two equivalent O(8)Nd2Fe2 tetrahedra, and corners with two equivalent O(6)BaMgFe2 trigonal pyramids. The corner-sharing octahedral tilt angles are 42°. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to two equivalent Ba(1), two equivalent Nd(1), and one Fe(4) atom. In the eighth O site, O(8) is bonded to two equivalent Nd(2), one Fe(1), and one Fe(3) atom to form ONd2Fe2 tetrahedra that share corners with two equivalent O(1)BaNdFe2 tetrahedra, corners with two equivalent O(8)Nd2Fe2 tetrahedra, and corners with two equivalent O(6)BaMgFe2 trigonal pyramids. In the ninth O site, O(9) is bonded to two equivalent Ba(1), two equivalent Ba(2), one Fe(2), and one Fe(4) atom to form OBa4Fe2 octahedra that share corners with two equivalent O(6)BaMgFe2 trigonal pyramids, edges with two equivalent O(9)Ba4Fe2 octahedra, and edges with two equivalent O(1)BaNdFe2 tetrahedra. In the tenth O site, O(10) is bonded in a 5-coordinate geometry to two equivalent Ba(2), two equivalent Nd(2), and one Fe(2) atom. is represented by the CIF file [CIF]
data_Ba2Nd2Mg(Fe2O5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.606
_cell_length_b   7.856
_cell_length_c   11.040
_cell_angle_alpha   100.884
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   307.098
_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
  Ba  Ba0  1  0.000  0.080  0.954  1.0
  Ba  Ba1  1  0.000  0.006  0.580  1.0
  Nd  Nd2  1  0.000  0.565  0.001  1.0
  Nd  Nd3  1  0.000  0.452  0.512  1.0
  Mg  Mg4  1  0.000  0.982  0.284  1.0
  Fe  Fe5  1  0.500  0.313  0.214  1.0
  Fe  Fe6  1  0.500  0.298  0.765  1.0
  Fe  Fe7  1  0.500  0.695  0.287  1.0
  Fe  Fe8  1  0.500  0.749  0.752  1.0
  O  O9  1  0.000  0.697  0.658  1.0
  O  O10  1  0.500  0.365  0.041  1.0
  O  O11  1  0.000  0.728  0.206  1.0
  O  O12  1  0.000  0.347  0.819  1.0
  O  O13  1  0.500  0.955  0.371  1.0
  O  O14  1  0.000  0.192  0.215  1.0
  O  O15  1  0.500  0.722  0.930  1.0
  O  O16  1  0.500  0.498  0.379  1.0
  O  O17  1  0.500  0.020  0.766  1.0
  O  O18  1  0.500  0.293  0.576  1.0
[/CIF]
.
The structure described by Ba2MgNd2(Fe2O5)2 crystallizes in the monoclinic Pm space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 8-coordinate geometry to one O(4), one O(6), two equivalent O(2), two equivalent O(7), and two equivalent O(9) atoms. In the second Ba site, Ba(2) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(10), two equivalent O(5), and two equivalent O(9) atoms. Mg(1) is bonded to one O(3), one O(6), and two equivalent O(5) atoms to form distorted MgO4 trigonal pyramids that share  a cornercorner with one Nd(1)O6 octahedra, corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Mg(1)O4 trigonal pyramids, and edges with two equivalent Fe(3)O4 trigonal pyramids. The corner-sharing octahedral tilt angles are 44°. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded to one O(3), one O(4), two equivalent O(2), and two equivalent O(7) atoms to form NdO6 octahedra that share corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra,  a cornercorner with one Mg(1)O4 trigonal pyramid, corners with two equivalent Fe(3)O4 trigonal pyramids, corners with two equivalent Fe(4)O4 trigonal pyramids, and edges with two equivalent Nd(1)O6 octahedra. In the second Nd site, Nd(2) is bonded to one O(1), two equivalent O(10), and two equivalent O(8) atoms to form distorted NdO5 square pyramids that share corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, corners with two equivalent Fe(3)O4 trigonal pyramids, corners with two equivalent Fe(4)O4 trigonal pyramids, and edges with two equivalent Nd(2)O5 square pyramids. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(2), one O(8), and two equivalent O(6) atoms to form distorted FeO4 tetrahedra that share corners with two equivalent Nd(1)O6 octahedra, corners with two equivalent Nd(2)O5 square pyramids, corners with two equivalent Fe(1)O4 tetrahedra,  a cornercorner with one Fe(3)O4 trigonal pyramid, and corners with two equivalent Mg(1)O4 trigonal pyramids. The corner-sharing octahedral tilt angles are 65°. In the second Fe site, Fe(2) is bonded to one O(10), one O(9), and two equivalent O(4) atoms to form distorted FeO4 tetrahedra that share corners with two equivalent Nd(1)O6 octahedra, corners with two equivalent Nd(2)O5 square pyramids, corners with two equivalent Fe(2)O4 tetrahedra, and  a cornercorner with one Fe(4)O4 trigonal pyramid. The corner-sharing octahedral tilt angles are 71°. In the third Fe site, Fe(3) is bonded to one O(5), one O(8), and two equivalent O(3) atoms to form FeO4 trigonal pyramids that share corners with two equivalent Nd(1)O6 octahedra, corners with two equivalent Nd(2)O5 square pyramids,  a cornercorner with one Fe(1)O4 tetrahedra, corners with two equivalent Fe(3)O4 trigonal pyramids, and edges with two equivalent Mg(1)O4 trigonal pyramids. The corner-sharing octahedral tilt angles are 71°. In the fourth Fe site, Fe(4) is bonded to one O(7), one O(9), and two equivalent O(1) atoms to form FeO4 trigonal pyramids that share corners with two equivalent Nd(1)O6 octahedra, corners with two equivalent Nd(2)O5 square pyramids,  a cornercorner with one Fe(2)O4 tetrahedra, and corners with two equivalent Fe(4)O4 trigonal pyramids. The corner-sharing octahedral tilt angles are 62°. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one Ba(2), one Nd(2), and two equivalent Fe(4) atoms to form distorted OBaNdFe2 tetrahedra that share corners with two equivalent O(1)BaNdFe2 tetrahedra, corners with two equivalent O(8)Nd2Fe2 tetrahedra, and edges with two equivalent O(9)Ba4Fe2 octahedra. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Ba(1), two equivalent Nd(1), and one Fe(1) atom. In the third O site, O(3) is bonded in a see-saw-like geometry to one Mg(1), one Nd(1), and two equivalent Fe(3) atoms. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ba(1), one Nd(1), and two equivalent Fe(2) atoms. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to two equivalent Ba(2), two equivalent Mg(1), and one Fe(3) atom. In the sixth O site, O(6) is bonded to one Ba(1), one Mg(1), and two equivalent Fe(1) atoms to form distorted OBaMgFe2 trigonal pyramids that share corners with two equivalent O(9)Ba4Fe2 octahedra, corners with two equivalent O(8)Nd2Fe2 tetrahedra, and corners with two equivalent O(6)BaMgFe2 trigonal pyramids. The corner-sharing octahedral tilt angles are 42°. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to two equivalent Ba(1), two equivalent Nd(1), and one Fe(4) atom. In the eighth O site, O(8) is bonded to two equivalent Nd(2), one Fe(1), and one Fe(3) atom to form ONd2Fe2 tetrahedra that share corners with two equivalent O(1)BaNdFe2 tetrahedra, corners with two equivalent O(8)Nd2Fe2 tetrahedra, and corners with two equivalent O(6)BaMgFe2 trigonal pyramids. In the ninth O site, O(9) is bonded to two equivalent Ba(1), two equivalent Ba(2), one Fe(2), and one Fe(4) atom to form OBa4Fe2 octahedra that share corners with two equivalent O(6)BaMgFe2 trigonal pyramids, edges with two equivalent O(9)Ba4Fe2 octahedra, and edges with two equivalent O(1)BaNdFe2 tetrahedra. In the tenth O site, O(10) is bonded in a 5-coordinate geometry to two equivalent Ba(2), two equivalent Nd(2), and one Fe(2) atom. is represented by the CIF file [CIF]
data_Ba2Nd2Mg(Fe2O5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.606
_cell_length_b   7.856
_cell_length_c   11.040
_cell_angle_alpha   100.884
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   307.098
_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
  Ba  Ba0  1  0.000  0.080  0.954  1.0
  Ba  Ba1  1  0.000  0.006  0.580  1.0
  Nd  Nd2  1  0.000  0.565  0.001  1.0
  Nd  Nd3  1  0.000  0.452  0.512  1.0
  Mg  Mg4  1  0.000  0.982  0.284  1.0
  Fe  Fe5  1  0.500  0.313  0.214  1.0
  Fe  Fe6  1  0.500  0.298  0.765  1.0
  Fe  Fe7  1  0.500  0.695  0.287  1.0
  Fe  Fe8  1  0.500  0.749  0.752  1.0
  O  O9  1  0.000  0.697  0.658  1.0
  O  O10  1  0.500  0.365  0.041  1.0
  O  O11  1  0.000  0.728  0.206  1.0
  O  O12  1  0.000  0.347  0.819  1.0
  O  O13  1  0.500  0.955  0.371  1.0
  O  O14  1  0.000  0.192  0.215  1.0
  O  O15  1  0.500  0.722  0.930  1.0
  O  O16  1  0.500  0.498  0.379  1.0
  O  O17  1  0.500  0.020  0.766  1.0
  O  O18  1  0.500  0.293  0.576  1.0
[/CIF]
.