The material 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 11-coordinate geometry to one Mg(1), one O(4), one O(6), two equivalent O(2), two equivalent O(5), two equivalent O(7), and two equivalent O(9) atoms. In the second Ba site, Ba(2) is bonded to one O(4), two equivalent O(5), and two equivalent O(9) atoms to form distorted BaO5 square pyramids that share corners with two equivalent Fe(4)O5 trigonal bipyramids, corners with two equivalent Fe(1)O4 trigonal pyramids, and edges with two equivalent Ba(2)O5 square pyramids. Mg(1) is bonded to one Ba(1), one O(1), one O(3), and two equivalent O(7) atoms to form MgBaO4 tetrahedra that share corners with two equivalent Nd(2)O7 hexagonal pyramids, corners with two equivalent O(5)Ba4Fe square pyramids, corners with two equivalent Mg(1)BaO4 tetrahedra, and edges with two equivalent Fe(4)O5 trigonal bipyramids. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(4), one O(6), and two equivalent O(2) atoms. In the second Nd site, Nd(2) is bonded to one O(1), one O(3), one O(6), two equivalent O(10), and two equivalent O(8) atoms to form distorted NdO7 hexagonal pyramids that share corners with two equivalent Mg(1)BaO4 tetrahedra, edges with two equivalent Nd(2)O7 hexagonal pyramids, edges with two equivalent Fe(4)O5 trigonal bipyramids, and edges with two equivalent Fe(1)O4 trigonal pyramids. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(10), one O(5), and two equivalent O(6) atoms to form distorted FeO4 trigonal pyramids that share corners with two equivalent Ba(2)O5 square pyramids, corners with two equivalent Fe(1)O4 trigonal pyramids, and edges with two equivalent Nd(2)O7 hexagonal pyramids. In the second Fe site, Fe(2) is bonded in a distorted square co-planar geometry to one O(10), one O(2), and two equivalent O(4) atoms. In the third Fe site, Fe(3) is bonded in a see-saw-like geometry to one O(7), one O(8), and two equivalent O(3) atoms. In the fourth Fe site, Fe(4) is bonded to one O(7), one O(8), one O(9), and two equivalent O(1) atoms to form distorted FeO5 trigonal bipyramids that share corners with two equivalent Ba(2)O5 square pyramids, corners with two equivalent Fe(4)O5 trigonal bipyramids, edges with two equivalent Nd(2)O7 hexagonal pyramids, and edges with two equivalent Mg(1)BaO4 tetrahedra. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Mg(1), one Nd(1), one Nd(2), and two equivalent Fe(4) atoms. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Ba(1), two equivalent Nd(1), and one Fe(2) atom. In the third O site, O(3) is bonded to one Mg(1), one Nd(1), one Nd(2), and two equivalent Fe(3) atoms to form distorted ONd2MgFe2 trigonal bipyramids that share corners with two equivalent O(10)Nd2Fe2 tetrahedra, corners with two equivalent O(3)Nd2MgFe2 trigonal bipyramids, and edges with two equivalent O(8)Nd2Fe2 trigonal pyramids. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Ba(1), one Ba(2), one Nd(1), and two equivalent Fe(2) atoms. In the fifth O site, O(5) is bonded to two equivalent Ba(1), two equivalent Ba(2), and one Fe(1) atom to form distorted OBa4Fe square pyramids that share  a cornercorner with one O(10)Nd2Fe2 tetrahedra, corners with two equivalent Mg(1)BaO4 tetrahedra, and edges with two equivalent O(5)Ba4Fe square pyramids. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Ba(1), one Nd(1), one Nd(2), and two equivalent Fe(1) atoms. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to two equivalent Ba(1), two equivalent Mg(1), one Fe(3), and one Fe(4) atom. In the eighth O site, O(8) is bonded to two equivalent Nd(2), one Fe(3), and one Fe(4) atom to form distorted ONd2Fe2 trigonal pyramids that share corners with two equivalent O(10)Nd2Fe2 tetrahedra, corners with two equivalent O(8)Nd2Fe2 trigonal pyramids,  an edgeedge with one O(10)Nd2Fe2 tetrahedra, and edges with two equivalent O(3)Nd2MgFe2 trigonal bipyramids. In the ninth O site, O(9) is bonded in a 5-coordinate geometry to two equivalent Ba(1), two equivalent Ba(2), and one Fe(4) atom. In the tenth O site, O(10) is bonded to two equivalent Nd(2), one Fe(1), and one Fe(2) atom to form ONd2Fe2 tetrahedra that share  a cornercorner with one O(5)Ba4Fe square pyramid, corners with two equivalent O(10)Nd2Fe2 tetrahedra, corners with two equivalent O(3)Nd2MgFe2 trigonal bipyramids, corners with two equivalent O(8)Nd2Fe2 trigonal pyramids, and  an edgeedge with one O(8)Nd2Fe2 trigonal pyramid. is represented by the CIF file [CIF]
data_Ba2Nd2Mg(Fe2O5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.821
_cell_length_b   10.083
_cell_length_c   7.915
_cell_angle_alpha   94.992
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   303.826
_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  0.067  0.006  1.0
  Ba  Ba1  1  0.000  0.005  0.512  1.0
  Nd  Nd2  1  0.000  0.418  0.005  1.0
  Nd  Nd3  1  0.000  0.528  0.495  1.0
  Mg  Mg4  1  0.000  0.731  0.999  1.0
  Fe  Fe5  1  0.500  0.267  0.324  1.0
  Fe  Fe6  1  0.500  0.270  0.708  1.0
  Fe  Fe7  1  0.500  0.704  0.252  1.0
  Fe  Fe8  1  0.500  0.756  0.744  1.0
  O  O9  1  0.000  0.625  0.785  1.0
  O  O10  1  0.500  0.300  0.977  1.0
  O  O11  1  0.000  0.622  0.197  1.0
  O  O12  1  0.000  0.227  0.728  1.0
  O  O13  1  0.500  0.073  0.268  1.0
  O  O14  1  0.000  0.334  0.266  1.0
  O  O15  1  0.500  0.788  0.032  1.0
  O  O16  1  0.500  0.687  0.489  1.0
  O  O17  1  0.500  0.949  0.741  1.0
  O  O18  1  0.500  0.402  0.536  1.0
[/CIF]
.
The material 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 11-coordinate geometry to one Mg(1), one O(4), one O(6), two equivalent O(2), two equivalent O(5), two equivalent O(7), and two equivalent O(9) atoms. In the second Ba site, Ba(2) is bonded to one O(4), two equivalent O(5), and two equivalent O(9) atoms to form distorted BaO5 square pyramids that share corners with two equivalent Fe(4)O5 trigonal bipyramids, corners with two equivalent Fe(1)O4 trigonal pyramids, and edges with two equivalent Ba(2)O5 square pyramids. Mg(1) is bonded to one Ba(1), one O(1), one O(3), and two equivalent O(7) atoms to form MgBaO4 tetrahedra that share corners with two equivalent Nd(2)O7 hexagonal pyramids, corners with two equivalent O(5)Ba4Fe square pyramids, corners with two equivalent Mg(1)BaO4 tetrahedra, and edges with two equivalent Fe(4)O5 trigonal bipyramids. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(4), one O(6), and two equivalent O(2) atoms. In the second Nd site, Nd(2) is bonded to one O(1), one O(3), one O(6), two equivalent O(10), and two equivalent O(8) atoms to form distorted NdO7 hexagonal pyramids that share corners with two equivalent Mg(1)BaO4 tetrahedra, edges with two equivalent Nd(2)O7 hexagonal pyramids, edges with two equivalent Fe(4)O5 trigonal bipyramids, and edges with two equivalent Fe(1)O4 trigonal pyramids. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(10), one O(5), and two equivalent O(6) atoms to form distorted FeO4 trigonal pyramids that share corners with two equivalent Ba(2)O5 square pyramids, corners with two equivalent Fe(1)O4 trigonal pyramids, and edges with two equivalent Nd(2)O7 hexagonal pyramids. In the second Fe site, Fe(2) is bonded in a distorted square co-planar geometry to one O(10), one O(2), and two equivalent O(4) atoms. In the third Fe site, Fe(3) is bonded in a see-saw-like geometry to one O(7), one O(8), and two equivalent O(3) atoms. In the fourth Fe site, Fe(4) is bonded to one O(7), one O(8), one O(9), and two equivalent O(1) atoms to form distorted FeO5 trigonal bipyramids that share corners with two equivalent Ba(2)O5 square pyramids, corners with two equivalent Fe(4)O5 trigonal bipyramids, edges with two equivalent Nd(2)O7 hexagonal pyramids, and edges with two equivalent Mg(1)BaO4 tetrahedra. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Mg(1), one Nd(1), one Nd(2), and two equivalent Fe(4) atoms. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Ba(1), two equivalent Nd(1), and one Fe(2) atom. In the third O site, O(3) is bonded to one Mg(1), one Nd(1), one Nd(2), and two equivalent Fe(3) atoms to form distorted ONd2MgFe2 trigonal bipyramids that share corners with two equivalent O(10)Nd2Fe2 tetrahedra, corners with two equivalent O(3)Nd2MgFe2 trigonal bipyramids, and edges with two equivalent O(8)Nd2Fe2 trigonal pyramids. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Ba(1), one Ba(2), one Nd(1), and two equivalent Fe(2) atoms. In the fifth O site, O(5) is bonded to two equivalent Ba(1), two equivalent Ba(2), and one Fe(1) atom to form distorted OBa4Fe square pyramids that share  a cornercorner with one O(10)Nd2Fe2 tetrahedra, corners with two equivalent Mg(1)BaO4 tetrahedra, and edges with two equivalent O(5)Ba4Fe square pyramids. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Ba(1), one Nd(1), one Nd(2), and two equivalent Fe(1) atoms. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to two equivalent Ba(1), two equivalent Mg(1), one Fe(3), and one Fe(4) atom. In the eighth O site, O(8) is bonded to two equivalent Nd(2), one Fe(3), and one Fe(4) atom to form distorted ONd2Fe2 trigonal pyramids that share corners with two equivalent O(10)Nd2Fe2 tetrahedra, corners with two equivalent O(8)Nd2Fe2 trigonal pyramids,  an edgeedge with one O(10)Nd2Fe2 tetrahedra, and edges with two equivalent O(3)Nd2MgFe2 trigonal bipyramids. In the ninth O site, O(9) is bonded in a 5-coordinate geometry to two equivalent Ba(1), two equivalent Ba(2), and one Fe(4) atom. In the tenth O site, O(10) is bonded to two equivalent Nd(2), one Fe(1), and one Fe(2) atom to form ONd2Fe2 tetrahedra that share  a cornercorner with one O(5)Ba4Fe square pyramid, corners with two equivalent O(10)Nd2Fe2 tetrahedra, corners with two equivalent O(3)Nd2MgFe2 trigonal bipyramids, corners with two equivalent O(8)Nd2Fe2 trigonal pyramids, and  an edgeedge with one O(8)Nd2Fe2 trigonal pyramid. is represented by the CIF file [CIF]
data_Ba2Nd2Mg(Fe2O5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.821
_cell_length_b   10.083
_cell_length_c   7.915
_cell_angle_alpha   94.992
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   303.826
_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  0.067  0.006  1.0
  Ba  Ba1  1  0.000  0.005  0.512  1.0
  Nd  Nd2  1  0.000  0.418  0.005  1.0
  Nd  Nd3  1  0.000  0.528  0.495  1.0
  Mg  Mg4  1  0.000  0.731  0.999  1.0
  Fe  Fe5  1  0.500  0.267  0.324  1.0
  Fe  Fe6  1  0.500  0.270  0.708  1.0
  Fe  Fe7  1  0.500  0.704  0.252  1.0
  Fe  Fe8  1  0.500  0.756  0.744  1.0
  O  O9  1  0.000  0.625  0.785  1.0
  O  O10  1  0.500  0.300  0.977  1.0
  O  O11  1  0.000  0.622  0.197  1.0
  O  O12  1  0.000  0.227  0.728  1.0
  O  O13  1  0.500  0.073  0.268  1.0
  O  O14  1  0.000  0.334  0.266  1.0
  O  O15  1  0.500  0.788  0.032  1.0
  O  O16  1  0.500  0.687  0.489  1.0
  O  O17  1  0.500  0.949  0.741  1.0
  O  O18  1  0.500  0.402  0.536  1.0
[/CIF]
.