The crystal structure described by Ba2MgY2(Fe2O5)2 crystallizes in the triclinic P1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(9), and two equivalent O(10) atoms. In the second Ba site, Ba(2) is bonded in a 6-coordinate geometry to one O(6), one O(7), two equivalent O(3), and two equivalent O(9) atoms. Mg(1) is bonded in a rectangular see-saw-like geometry to one O(1), one O(2), one O(5), and one O(8) atom. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a body-centered cubic geometry to one O(5), one O(6), one O(7), one O(8), two equivalent O(3), and two equivalent O(4) atoms. In the second Y site, Y(2) is bonded in a 6-coordinate geometry to one O(6), one O(7), two equivalent O(1), and two equivalent O(2) atoms. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(3), one O(9), and two equivalent O(7) atoms to form distorted FeO5 trigonal bipyramids that share  a cornercorner with one Fe(3)O5 trigonal bipyramid, corners with two equivalent Fe(1)O5 trigonal bipyramids, and  a cornercorner with one Fe(4)O4 trigonal pyramid. In the second Fe site, Fe(2) is bonded to one O(10), one O(4), and two equivalent O(8) atoms to form distorted FeO4 trigonal pyramids that share  a cornercorner with one Fe(3)O5 trigonal bipyramid,  a cornercorner with one Fe(4)O4 trigonal pyramid, and corners with two equivalent Fe(2)O4 trigonal pyramids. In the third Fe site, Fe(3) is bonded to one O(2), one O(4), one O(9), and two equivalent O(6) atoms to form distorted FeO5 trigonal bipyramids that share  a cornercorner with one Fe(1)O5 trigonal bipyramid, corners with two equivalent Fe(3)O5 trigonal bipyramids, and  a cornercorner with one Fe(2)O4 trigonal pyramid. In the fourth Fe site, Fe(4) is bonded to one O(10), one O(3), and two equivalent O(5) atoms to form distorted FeO4 trigonal pyramids that share  a cornercorner with one Fe(1)O5 trigonal bipyramid,  a cornercorner with one Fe(2)O4 trigonal pyramid, and corners with two equivalent Fe(4)O4 trigonal pyramids. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one Ba(1), one Mg(1), two equivalent Y(2), and one Fe(1) atom to form distorted OBaY2MgFe trigonal bipyramids that share corners with two equivalent O(10)Ba2Fe2 tetrahedra, corners with two equivalent O(1)BaY2MgFe trigonal bipyramids, corners with three equivalent O(2)BaY2MgFe trigonal bipyramids,  a cornercorner with one O(5)YMgFe2 trigonal pyramid,  an edgeedge with one O(9)Ba3Fe2 trigonal bipyramid, and  a faceface with one O(2)BaY2MgFe trigonal bipyramid. In the second O site, O(2) is bonded to one Ba(1), one Mg(1), two equivalent Y(2), and one Fe(3) atom to form distorted OBaY2MgFe trigonal bipyramids that share corners with two equivalent O(10)Ba2Fe2 tetrahedra, corners with two equivalent O(2)BaY2MgFe trigonal bipyramids, corners with three equivalent O(1)BaY2MgFe trigonal bipyramids,  a cornercorner with one O(5)YMgFe2 trigonal pyramid,  an edgeedge with one O(9)Ba3Fe2 trigonal bipyramid, and  a faceface with one O(1)BaY2MgFe trigonal bipyramid. In the third O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Ba(2), two equivalent Y(1), one Fe(1), and one Fe(4) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Y(1), one Fe(2), and one Fe(3) atom. In the fifth O site, O(5) is bonded to one Mg(1), one Y(1), and two equivalent Fe(4) atoms to form distorted OYMgFe2 trigonal pyramids that share corners with two equivalent O(10)Ba2Fe2 tetrahedra,  a cornercorner with one O(1)BaY2MgFe trigonal bipyramid,  a cornercorner with one O(2)BaY2MgFe trigonal bipyramid, and corners with two equivalent O(5)YMgFe2 trigonal pyramids. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to one Ba(2), one Y(1), one Y(2), and two equivalent Fe(3) atoms. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to one Ba(2), one Y(1), one Y(2), and two equivalent Fe(1) atoms. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Mg(1), one Y(1), and two equivalent Fe(2) atoms. In the ninth O site, O(9) is bonded to one Ba(1), two equivalent Ba(2), one Fe(1), and one Fe(3) atom to form distorted OBa3Fe2 trigonal bipyramids that share corners with two equivalent O(10)Ba2Fe2 tetrahedra, corners with two equivalent O(9)Ba3Fe2 trigonal bipyramids,  an edgeedge with one O(1)BaY2MgFe trigonal bipyramid, and  an edgeedge with one O(2)BaY2MgFe trigonal bipyramid. In the tenth O site, O(10) is bonded to two equivalent Ba(1), one Fe(2), and one Fe(4) atom to form distorted OBa2Fe2 tetrahedra that share corners with two equivalent O(10)Ba2Fe2 tetrahedra, corners with two equivalent O(9)Ba3Fe2 trigonal bipyramids, corners with two equivalent O(1)BaY2MgFe trigonal bipyramids, corners with two equivalent O(2)BaY2MgFe trigonal bipyramids, and corners with two equivalent O(5)YMgFe2 trigonal pyramids. is represented by the CIF file [CIF]
data_Ba2Y2Mg(Fe2O5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.900
_cell_length_b   7.787
_cell_length_c   9.668
_cell_angle_alpha   89.962
_cell_angle_beta   100.465
_cell_angle_gamma   89.998
_symmetry_Int_Tables_number   1
_cell_volume   288.699
_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  0.767  0.005  0.542  1.0
  Ba  Ba1  1  0.974  0.984  0.054  1.0
  Y  Y2  1  0.973  0.503  0.006  1.0
  Y  Y3  1  0.162  0.495  0.395  1.0
  Mg  Mg4  1  0.783  0.499  0.645  1.0
  Fe  Fe5  1  0.579  0.747  0.242  1.0
  Fe  Fe6  1  0.383  0.234  0.811  1.0
  Fe  Fe7  1  0.572  0.257  0.224  1.0
  Fe  Fe8  1  0.378  0.765  0.807  1.0
  O  O9  1  0.695  0.665  0.468  1.0
  O  O10  1  0.695  0.335  0.471  1.0
  O  O11  1  0.472  0.704  0.011  1.0
  O  O12  1  0.474  0.328  0.008  1.0
  O  O13  1  0.872  0.681  0.790  1.0
  O  O14  1  0.066  0.314  0.217  1.0
  O  O15  1  0.062  0.667  0.215  1.0
  O  O16  1  0.875  0.312  0.790  1.0
  O  O17  1  0.553  0.997  0.248  1.0
  O  O18  1  0.351  0.000  0.724  1.0
[/CIF]
.
The crystal structure described by Ba2MgY2(Fe2O5)2 crystallizes in the triclinic P1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(9), and two equivalent O(10) atoms. In the second Ba site, Ba(2) is bonded in a 6-coordinate geometry to one O(6), one O(7), two equivalent O(3), and two equivalent O(9) atoms. Mg(1) is bonded in a rectangular see-saw-like geometry to one O(1), one O(2), one O(5), and one O(8) atom. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a body-centered cubic geometry to one O(5), one O(6), one O(7), one O(8), two equivalent O(3), and two equivalent O(4) atoms. In the second Y site, Y(2) is bonded in a 6-coordinate geometry to one O(6), one O(7), two equivalent O(1), and two equivalent O(2) atoms. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(3), one O(9), and two equivalent O(7) atoms to form distorted FeO5 trigonal bipyramids that share  a cornercorner with one Fe(3)O5 trigonal bipyramid, corners with two equivalent Fe(1)O5 trigonal bipyramids, and  a cornercorner with one Fe(4)O4 trigonal pyramid. In the second Fe site, Fe(2) is bonded to one O(10), one O(4), and two equivalent O(8) atoms to form distorted FeO4 trigonal pyramids that share  a cornercorner with one Fe(3)O5 trigonal bipyramid,  a cornercorner with one Fe(4)O4 trigonal pyramid, and corners with two equivalent Fe(2)O4 trigonal pyramids. In the third Fe site, Fe(3) is bonded to one O(2), one O(4), one O(9), and two equivalent O(6) atoms to form distorted FeO5 trigonal bipyramids that share  a cornercorner with one Fe(1)O5 trigonal bipyramid, corners with two equivalent Fe(3)O5 trigonal bipyramids, and  a cornercorner with one Fe(2)O4 trigonal pyramid. In the fourth Fe site, Fe(4) is bonded to one O(10), one O(3), and two equivalent O(5) atoms to form distorted FeO4 trigonal pyramids that share  a cornercorner with one Fe(1)O5 trigonal bipyramid,  a cornercorner with one Fe(2)O4 trigonal pyramid, and corners with two equivalent Fe(4)O4 trigonal pyramids. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one Ba(1), one Mg(1), two equivalent Y(2), and one Fe(1) atom to form distorted OBaY2MgFe trigonal bipyramids that share corners with two equivalent O(10)Ba2Fe2 tetrahedra, corners with two equivalent O(1)BaY2MgFe trigonal bipyramids, corners with three equivalent O(2)BaY2MgFe trigonal bipyramids,  a cornercorner with one O(5)YMgFe2 trigonal pyramid,  an edgeedge with one O(9)Ba3Fe2 trigonal bipyramid, and  a faceface with one O(2)BaY2MgFe trigonal bipyramid. In the second O site, O(2) is bonded to one Ba(1), one Mg(1), two equivalent Y(2), and one Fe(3) atom to form distorted OBaY2MgFe trigonal bipyramids that share corners with two equivalent O(10)Ba2Fe2 tetrahedra, corners with two equivalent O(2)BaY2MgFe trigonal bipyramids, corners with three equivalent O(1)BaY2MgFe trigonal bipyramids,  a cornercorner with one O(5)YMgFe2 trigonal pyramid,  an edgeedge with one O(9)Ba3Fe2 trigonal bipyramid, and  a faceface with one O(1)BaY2MgFe trigonal bipyramid. In the third O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Ba(2), two equivalent Y(1), one Fe(1), and one Fe(4) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Y(1), one Fe(2), and one Fe(3) atom. In the fifth O site, O(5) is bonded to one Mg(1), one Y(1), and two equivalent Fe(4) atoms to form distorted OYMgFe2 trigonal pyramids that share corners with two equivalent O(10)Ba2Fe2 tetrahedra,  a cornercorner with one O(1)BaY2MgFe trigonal bipyramid,  a cornercorner with one O(2)BaY2MgFe trigonal bipyramid, and corners with two equivalent O(5)YMgFe2 trigonal pyramids. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to one Ba(2), one Y(1), one Y(2), and two equivalent Fe(3) atoms. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to one Ba(2), one Y(1), one Y(2), and two equivalent Fe(1) atoms. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Mg(1), one Y(1), and two equivalent Fe(2) atoms. In the ninth O site, O(9) is bonded to one Ba(1), two equivalent Ba(2), one Fe(1), and one Fe(3) atom to form distorted OBa3Fe2 trigonal bipyramids that share corners with two equivalent O(10)Ba2Fe2 tetrahedra, corners with two equivalent O(9)Ba3Fe2 trigonal bipyramids,  an edgeedge with one O(1)BaY2MgFe trigonal bipyramid, and  an edgeedge with one O(2)BaY2MgFe trigonal bipyramid. In the tenth O site, O(10) is bonded to two equivalent Ba(1), one Fe(2), and one Fe(4) atom to form distorted OBa2Fe2 tetrahedra that share corners with two equivalent O(10)Ba2Fe2 tetrahedra, corners with two equivalent O(9)Ba3Fe2 trigonal bipyramids, corners with two equivalent O(1)BaY2MgFe trigonal bipyramids, corners with two equivalent O(2)BaY2MgFe trigonal bipyramids, and corners with two equivalent O(5)YMgFe2 trigonal pyramids. is represented by the CIF file [CIF]
data_Ba2Y2Mg(Fe2O5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.900
_cell_length_b   7.787
_cell_length_c   9.668
_cell_angle_alpha   89.962
_cell_angle_beta   100.465
_cell_angle_gamma   89.998
_symmetry_Int_Tables_number   1
_cell_volume   288.699
_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  0.767  0.005  0.542  1.0
  Ba  Ba1  1  0.974  0.984  0.054  1.0
  Y  Y2  1  0.973  0.503  0.006  1.0
  Y  Y3  1  0.162  0.495  0.395  1.0
  Mg  Mg4  1  0.783  0.499  0.645  1.0
  Fe  Fe5  1  0.579  0.747  0.242  1.0
  Fe  Fe6  1  0.383  0.234  0.811  1.0
  Fe  Fe7  1  0.572  0.257  0.224  1.0
  Fe  Fe8  1  0.378  0.765  0.807  1.0
  O  O9  1  0.695  0.665  0.468  1.0
  O  O10  1  0.695  0.335  0.471  1.0
  O  O11  1  0.472  0.704  0.011  1.0
  O  O12  1  0.474  0.328  0.008  1.0
  O  O13  1  0.872  0.681  0.790  1.0
  O  O14  1  0.066  0.314  0.217  1.0
  O  O15  1  0.062  0.667  0.215  1.0
  O  O16  1  0.875  0.312  0.790  1.0
  O  O17  1  0.553  0.997  0.248  1.0
  O  O18  1  0.351  0.000  0.724  1.0
[/CIF]
.