The crystal structure described by BaMn2Fe4O11 crystallizes in the monoclinic Cc space group. Ba(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), two equivalent O(10), two equivalent O(11), and two equivalent O(9) atoms to form BaO12 cuboctahedra that share corners with six equivalent Ba(1)O12 cuboctahedra, edges with two equivalent Mn(1)O6 octahedra, edges with two equivalent Mn(2)O6 octahedra, edges with two equivalent Fe(3)O6 octahedra, faces with three equivalent Fe(1)O6 octahedra, and faces with three equivalent Fe(2)O6 octahedra. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(3), one O(4), one O(6), one O(7), and one O(8) atom to form MnO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra, edges with two equivalent Ba(1)O12 cuboctahedra, edges with two equivalent Mn(2)O6 octahedra, and edges with two equivalent Fe(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 52-54°. In the second Mn site, Mn(2) is bonded to one O(1), one O(2), one O(4), one O(5), one O(7), and one O(8) atom to form MnO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra, edges with two equivalent Ba(1)O12 cuboctahedra, edges with two equivalent Mn(1)O6 octahedra, and edges with two equivalent Fe(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-54°. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(10), one O(11), one O(2), one O(3), and one O(9) atom to form distorted FeO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Fe(3)O6 octahedra, faces with three equivalent Ba(1)O12 cuboctahedra, and  a faceface with one Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 52-56°. In the second Fe site, Fe(2) is bonded to one O(10), one O(11), one O(4), one O(5), one O(6), and one O(9) atom to form FeO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Fe(3)O6 octahedra, faces with three equivalent Ba(1)O12 cuboctahedra, and  a faceface with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-55°. In the third Fe site, Fe(3) is bonded to one O(2), one O(3), one O(5), one O(6), one O(7), and one O(8) atom to form FeO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra, edges with two equivalent Ba(1)O12 cuboctahedra, edges with two equivalent Mn(1)O6 octahedra, and edges with two equivalent Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-56°. In the fourth Fe site, Fe(4) is bonded in a 5-coordinate geometry to one O(10), one O(11), one O(7), one O(8), and one O(9) atom. There are eleven inequivalent O sites. In the first O site, O(5) is bonded in a 3-coordinate geometry to one Ba(1), one Mn(2), one Fe(2), and one Fe(3) atom. In the second O site, O(6) is bonded in a 3-coordinate geometry to one Ba(1), one Mn(1), one Fe(2), and one Fe(3) atom. In the third O site, O(7) is bonded in a 4-coordinate geometry to one Mn(1), one Mn(2), one Fe(3), and one Fe(4) atom. In the fourth O site, O(8) is bonded in a rectangular see-saw-like geometry to one Mn(1), one Mn(2), one Fe(3), and one Fe(4) atom. In the fifth O site, O(9) is bonded in a 3-coordinate geometry to two equivalent Ba(1), one Fe(1), one Fe(2), and one Fe(4) atom. In the sixth O site, O(10) is bonded in a 3-coordinate geometry to two equivalent Ba(1), one Fe(1), one Fe(2), and one Fe(4) atom. In the seventh O site, O(11) is bonded in a 3-coordinate geometry to two equivalent Ba(1), one Fe(1), one Fe(2), and one Fe(4) atom. In the eighth O site, O(1) is bonded in a 4-coordinate geometry to one Ba(1), one Mn(1), one Mn(2), and one Fe(1) atom. In the ninth O site, O(2) is bonded in a 4-coordinate geometry to one Ba(1), one Mn(2), one Fe(1), and one Fe(3) atom. In the tenth O site, O(3) is bonded in a 4-coordinate geometry to one Ba(1), one Mn(1), one Fe(1), and one Fe(3) atom. In the eleventh O site, O(4) is bonded in a 3-coordinate geometry to one Ba(1), one Mn(1), one Mn(2), and one Fe(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_BaMn2Fe4O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.889
_cell_length_b   5.889
_cell_length_c   13.618
_cell_angle_alpha   89.983
_cell_angle_beta   89.983
_cell_angle_gamma   119.871
_symmetry_Int_Tables_number   1
_cell_volume   409.519
_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
  Ba  Ba0  1  0.333  0.667  0.252  1.0
  Ba  Ba1  1  0.667  0.333  0.752  1.0
  Mn  Mn2  1  0.501  0.003  0.500  1.0
  Mn  Mn3  1  0.501  0.499  0.500  1.0
  Mn  Mn4  1  0.003  0.501  1.000  1.0
  Mn  Mn5  1  0.499  0.501  1.000  1.0
  Fe  Fe6  1  0.006  0.003  0.356  1.0
  Fe  Fe7  1  0.994  0.997  0.645  1.0
  Fe  Fe8  1  0.003  0.006  0.856  1.0
  Fe  Fe9  1  0.997  0.994  0.145  1.0
  Fe  Fe10  1  0.998  0.499  0.500  1.0
  Fe  Fe11  1  0.499  0.998  1.000  1.0
  Fe  Fe12  1  0.334  0.667  0.731  1.0
  Fe  Fe13  1  0.667  0.334  0.231  1.0
  O  O14  1  0.648  0.825  0.424  1.0
  O  O15  1  0.184  0.350  0.422  1.0
  O  O16  1  0.185  0.835  0.422  1.0
  O  O17  1  0.353  0.177  0.577  1.0
  O  O18  1  0.815  0.651  0.578  1.0
  O  O19  1  0.815  0.165  0.579  1.0
  O  O20  1  0.350  0.184  0.922  1.0
  O  O21  1  0.825  0.648  0.924  1.0
  O  O22  1  0.835  0.185  0.922  1.0
  O  O23  1  0.651  0.815  0.078  1.0
  O  O24  1  0.177  0.353  0.077  1.0
  O  O25  1  0.165  0.815  0.079  1.0
  O  O26  1  0.326  0.651  0.923  1.0
  O  O27  1  0.673  0.347  0.078  1.0
  O  O28  1  0.651  0.326  0.423  1.0
  O  O29  1  0.347  0.673  0.578  1.0
  O  O30  1  0.699  0.850  0.752  1.0
  O  O31  1  0.151  0.301  0.746  1.0
  O  O32  1  0.151  0.849  0.749  1.0
  O  O33  1  0.301  0.151  0.246  1.0
  O  O34  1  0.850  0.699  0.252  1.0
  O  O35  1  0.849  0.151  0.249  1.0
[/CIF]
.
The crystal structure described by BaMn2Fe4O11 crystallizes in the monoclinic Cc space group. Ba(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), two equivalent O(10), two equivalent O(11), and two equivalent O(9) atoms to form BaO12 cuboctahedra that share corners with six equivalent Ba(1)O12 cuboctahedra, edges with two equivalent Mn(1)O6 octahedra, edges with two equivalent Mn(2)O6 octahedra, edges with two equivalent Fe(3)O6 octahedra, faces with three equivalent Fe(1)O6 octahedra, and faces with three equivalent Fe(2)O6 octahedra. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(3), one O(4), one O(6), one O(7), and one O(8) atom to form MnO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra, edges with two equivalent Ba(1)O12 cuboctahedra, edges with two equivalent Mn(2)O6 octahedra, and edges with two equivalent Fe(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 52-54°. In the second Mn site, Mn(2) is bonded to one O(1), one O(2), one O(4), one O(5), one O(7), and one O(8) atom to form MnO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra, edges with two equivalent Ba(1)O12 cuboctahedra, edges with two equivalent Mn(1)O6 octahedra, and edges with two equivalent Fe(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-54°. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(10), one O(11), one O(2), one O(3), and one O(9) atom to form distorted FeO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Fe(3)O6 octahedra, faces with three equivalent Ba(1)O12 cuboctahedra, and  a faceface with one Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 52-56°. In the second Fe site, Fe(2) is bonded to one O(10), one O(11), one O(4), one O(5), one O(6), and one O(9) atom to form FeO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Fe(3)O6 octahedra, faces with three equivalent Ba(1)O12 cuboctahedra, and  a faceface with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-55°. In the third Fe site, Fe(3) is bonded to one O(2), one O(3), one O(5), one O(6), one O(7), and one O(8) atom to form FeO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra, edges with two equivalent Ba(1)O12 cuboctahedra, edges with two equivalent Mn(1)O6 octahedra, and edges with two equivalent Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-56°. In the fourth Fe site, Fe(4) is bonded in a 5-coordinate geometry to one O(10), one O(11), one O(7), one O(8), and one O(9) atom. There are eleven inequivalent O sites. In the first O site, O(5) is bonded in a 3-coordinate geometry to one Ba(1), one Mn(2), one Fe(2), and one Fe(3) atom. In the second O site, O(6) is bonded in a 3-coordinate geometry to one Ba(1), one Mn(1), one Fe(2), and one Fe(3) atom. In the third O site, O(7) is bonded in a 4-coordinate geometry to one Mn(1), one Mn(2), one Fe(3), and one Fe(4) atom. In the fourth O site, O(8) is bonded in a rectangular see-saw-like geometry to one Mn(1), one Mn(2), one Fe(3), and one Fe(4) atom. In the fifth O site, O(9) is bonded in a 3-coordinate geometry to two equivalent Ba(1), one Fe(1), one Fe(2), and one Fe(4) atom. In the sixth O site, O(10) is bonded in a 3-coordinate geometry to two equivalent Ba(1), one Fe(1), one Fe(2), and one Fe(4) atom. In the seventh O site, O(11) is bonded in a 3-coordinate geometry to two equivalent Ba(1), one Fe(1), one Fe(2), and one Fe(4) atom. In the eighth O site, O(1) is bonded in a 4-coordinate geometry to one Ba(1), one Mn(1), one Mn(2), and one Fe(1) atom. In the ninth O site, O(2) is bonded in a 4-coordinate geometry to one Ba(1), one Mn(2), one Fe(1), and one Fe(3) atom. In the tenth O site, O(3) is bonded in a 4-coordinate geometry to one Ba(1), one Mn(1), one Fe(1), and one Fe(3) atom. In the eleventh O site, O(4) is bonded in a 3-coordinate geometry to one Ba(1), one Mn(1), one Mn(2), and one Fe(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_BaMn2Fe4O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.889
_cell_length_b   5.889
_cell_length_c   13.618
_cell_angle_alpha   89.983
_cell_angle_beta   89.983
_cell_angle_gamma   119.871
_symmetry_Int_Tables_number   1
_cell_volume   409.519
_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
  Ba  Ba0  1  0.333  0.667  0.252  1.0
  Ba  Ba1  1  0.667  0.333  0.752  1.0
  Mn  Mn2  1  0.501  0.003  0.500  1.0
  Mn  Mn3  1  0.501  0.499  0.500  1.0
  Mn  Mn4  1  0.003  0.501  1.000  1.0
  Mn  Mn5  1  0.499  0.501  1.000  1.0
  Fe  Fe6  1  0.006  0.003  0.356  1.0
  Fe  Fe7  1  0.994  0.997  0.645  1.0
  Fe  Fe8  1  0.003  0.006  0.856  1.0
  Fe  Fe9  1  0.997  0.994  0.145  1.0
  Fe  Fe10  1  0.998  0.499  0.500  1.0
  Fe  Fe11  1  0.499  0.998  1.000  1.0
  Fe  Fe12  1  0.334  0.667  0.731  1.0
  Fe  Fe13  1  0.667  0.334  0.231  1.0
  O  O14  1  0.648  0.825  0.424  1.0
  O  O15  1  0.184  0.350  0.422  1.0
  O  O16  1  0.185  0.835  0.422  1.0
  O  O17  1  0.353  0.177  0.577  1.0
  O  O18  1  0.815  0.651  0.578  1.0
  O  O19  1  0.815  0.165  0.579  1.0
  O  O20  1  0.350  0.184  0.922  1.0
  O  O21  1  0.825  0.648  0.924  1.0
  O  O22  1  0.835  0.185  0.922  1.0
  O  O23  1  0.651  0.815  0.078  1.0
  O  O24  1  0.177  0.353  0.077  1.0
  O  O25  1  0.165  0.815  0.079  1.0
  O  O26  1  0.326  0.651  0.923  1.0
  O  O27  1  0.673  0.347  0.078  1.0
  O  O28  1  0.651  0.326  0.423  1.0
  O  O29  1  0.347  0.673  0.578  1.0
  O  O30  1  0.699  0.850  0.752  1.0
  O  O31  1  0.151  0.301  0.746  1.0
  O  O32  1  0.151  0.849  0.749  1.0
  O  O33  1  0.301  0.151  0.246  1.0
  O  O34  1  0.850  0.699  0.252  1.0
  O  O35  1  0.849  0.151  0.249  1.0
[/CIF]
.