The structure described by Ba8Gd4(Cu4O9)3 crystallizes in the monoclinic C2/m space group. There are four inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 9-coordinate geometry to one O(4), one O(6), one O(9), two equivalent O(2), two equivalent O(7), and two equivalent O(8) atoms. In the second Ba site, Ba(2) is bonded in a 10-coordinate geometry to one O(10), one O(3), one O(6), one O(9), two equivalent O(1), two equivalent O(7), and two equivalent O(8) atoms. In the third Ba site, Ba(3) is bonded in a 10-coordinate geometry to one O(10), one O(3), one O(5), one O(9), two equivalent O(2), two equivalent O(7), and two equivalent O(8) atoms. In the fourth Ba site, Ba(4) is bonded in a 9-coordinate geometry to one O(4), one O(5), one O(9), two equivalent O(1), two equivalent O(7), and two equivalent O(8) atoms. There are three inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a body-centered cubic geometry to two equivalent O(3), two equivalent O(6), and four equivalent O(1) atoms. In the second Gd site, Gd(2) is bonded in a body-centered cubic geometry to two equivalent O(4), two equivalent O(5), and four equivalent O(1) atoms. In the third Gd site, Gd(3) is bonded in a body-centered cubic geometry to one O(3), one O(4), one O(5), one O(6), and four equivalent O(2) atoms. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one O(1), one O(2), one O(3), one O(4), and one O(7) atom to form corner-sharing CuO5 square pyramids. In the second Cu site, Cu(2) is bonded to one O(1), one O(2), one O(5), one O(6), and one O(8) atom to form corner-sharing CuO5 square pyramids. In the third Cu site, Cu(3) is bonded in a T-shaped geometry to one O(10) and two equivalent O(7) atoms. In the fourth Cu site, Cu(4) is bonded in a square co-planar geometry to two equivalent O(8) and two equivalent O(9) atoms. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Ba(2), one Ba(4), one Gd(1), one Gd(2), one Cu(1), and one Cu(2) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Ba(1), one Ba(3), two equivalent Gd(3), one Cu(1), and one Cu(2) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to one Ba(2), one Ba(3), one Gd(1), one Gd(3), and two equivalent Cu(1) atoms. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Ba(1), one Ba(4), one Gd(2), one Gd(3), and two equivalent Cu(1) atoms. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one Ba(3), one Ba(4), one Gd(2), one Gd(3), and two equivalent Cu(2) atoms. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Ba(1), one Ba(2), one Gd(1), one Gd(3), and two equivalent Cu(2) atoms. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to one Ba(1), one Ba(2), one Ba(3), one Ba(4), one Cu(1), and one Cu(3) atom. In the eighth O site, O(8) is bonded to one Ba(1), one Ba(2), one Ba(3), one Ba(4), one Cu(2), and one Cu(4) atom to form a mixture of distorted corner, edge, and face-sharing OBa4Cu2 octahedra. The corner-sharing octahedra are not tilted. In the ninth O site, O(9) is bonded to one Ba(1), one Ba(2), one Ba(3), one Ba(4), and two equivalent Cu(4) atoms to form a mixture of distorted corner and face-sharing OBa4Cu2 octahedra. The corner-sharing octahedra are not tilted. In the tenth O site, O(10) is bonded in a distorted linear geometry to two equivalent Ba(2), two equivalent Ba(3), and two equivalent Cu(3) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ba8Gd4(Cu4O9)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.676
_cell_length_b   8.676
_cell_length_c   12.498
_cell_angle_alpha   74.001
_cell_angle_beta   74.001
_cell_angle_gamma   53.914
_symmetry_Int_Tables_number   1
_cell_volume   722.918
_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  0.177  0.177  0.811  1.0
  Ba  Ba1  1  0.420  0.420  0.818  1.0
  Ba  Ba2  1  0.671  0.671  0.818  1.0
  Ba  Ba3  1  0.917  0.917  0.812  1.0
  Ba  Ba4  1  0.329  0.329  0.182  1.0
  Ba  Ba5  1  0.580  0.580  0.182  1.0
  Ba  Ba6  1  0.823  0.823  0.189  1.0
  Ba  Ba7  1  0.083  0.083  0.188  1.0
  Gd  Gd8  1  0.500  0.500  0.500  1.0
  Gd  Gd9  1  0.000  0.000  0.500  1.0
  Gd  Gd10  1  0.750  0.750  0.501  1.0
  Gd  Gd11  1  0.250  0.250  0.499  1.0
  Cu  Cu12  1  0.338  0.839  0.644  1.0
  Cu  Cu13  1  0.839  0.338  0.644  1.0
  Cu  Cu14  1  0.589  0.089  0.645  1.0
  Cu  Cu15  1  0.089  0.589  0.645  1.0
  Cu  Cu16  1  0.411  0.911  0.355  1.0
  Cu  Cu17  1  0.911  0.411  0.355  1.0
  Cu  Cu18  1  0.662  0.161  0.356  1.0
  Cu  Cu19  1  0.161  0.662  0.356  1.0
  Cu  Cu20  1  0.261  0.739  0.000  1.0
  Cu  Cu21  1  0.739  0.261  0.000  1.0
  Cu  Cu22  1  0.500  0.000  0.000  1.0
  Cu  Cu23  1  0.000  0.500  0.000  1.0
  O  O24  1  0.219  0.719  0.624  1.0
  O  O25  1  0.719  0.219  0.624  1.0
  O  O26  1  0.469  0.969  0.624  1.0
  O  O27  1  0.969  0.469  0.624  1.0
  O  O28  1  0.281  0.781  0.376  1.0
  O  O29  1  0.781  0.281  0.376  1.0
  O  O30  1  0.531  0.031  0.376  1.0
  O  O31  1  0.031  0.531  0.376  1.0
  O  O32  1  0.594  0.594  0.624  1.0
  O  O33  1  0.095  0.095  0.622  1.0
  O  O34  1  0.844  0.844  0.624  1.0
  O  O35  1  0.344  0.344  0.623  1.0
  O  O36  1  0.656  0.656  0.377  1.0
  O  O37  1  0.156  0.156  0.376  1.0
  O  O38  1  0.905  0.905  0.378  1.0
  O  O39  1  0.406  0.406  0.376  1.0
  O  O40  1  0.270  0.806  0.848  1.0
  O  O41  1  0.806  0.270  0.848  1.0
  O  O42  1  0.540  0.040  0.842  1.0
  O  O43  1  0.040  0.540  0.842  1.0
  O  O44  1  0.460  0.960  0.158  1.0
  O  O45  1  0.960  0.460  0.158  1.0
  O  O46  1  0.730  0.194  0.152  1.0
  O  O47  1  0.194  0.730  0.152  1.0
  O  O48  1  0.249  0.249  0.000  1.0
  O  O49  1  0.500  0.500  0.000  1.0
  O  O50  1  0.751  0.751  1.000  1.0
[/CIF]
.
The structure described by Ba8Gd4(Cu4O9)3 crystallizes in the monoclinic C2/m space group. There are four inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 9-coordinate geometry to one O(4), one O(6), one O(9), two equivalent O(2), two equivalent O(7), and two equivalent O(8) atoms. In the second Ba site, Ba(2) is bonded in a 10-coordinate geometry to one O(10), one O(3), one O(6), one O(9), two equivalent O(1), two equivalent O(7), and two equivalent O(8) atoms. In the third Ba site, Ba(3) is bonded in a 10-coordinate geometry to one O(10), one O(3), one O(5), one O(9), two equivalent O(2), two equivalent O(7), and two equivalent O(8) atoms. In the fourth Ba site, Ba(4) is bonded in a 9-coordinate geometry to one O(4), one O(5), one O(9), two equivalent O(1), two equivalent O(7), and two equivalent O(8) atoms. There are three inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a body-centered cubic geometry to two equivalent O(3), two equivalent O(6), and four equivalent O(1) atoms. In the second Gd site, Gd(2) is bonded in a body-centered cubic geometry to two equivalent O(4), two equivalent O(5), and four equivalent O(1) atoms. In the third Gd site, Gd(3) is bonded in a body-centered cubic geometry to one O(3), one O(4), one O(5), one O(6), and four equivalent O(2) atoms. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one O(1), one O(2), one O(3), one O(4), and one O(7) atom to form corner-sharing CuO5 square pyramids. In the second Cu site, Cu(2) is bonded to one O(1), one O(2), one O(5), one O(6), and one O(8) atom to form corner-sharing CuO5 square pyramids. In the third Cu site, Cu(3) is bonded in a T-shaped geometry to one O(10) and two equivalent O(7) atoms. In the fourth Cu site, Cu(4) is bonded in a square co-planar geometry to two equivalent O(8) and two equivalent O(9) atoms. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Ba(2), one Ba(4), one Gd(1), one Gd(2), one Cu(1), and one Cu(2) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Ba(1), one Ba(3), two equivalent Gd(3), one Cu(1), and one Cu(2) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to one Ba(2), one Ba(3), one Gd(1), one Gd(3), and two equivalent Cu(1) atoms. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Ba(1), one Ba(4), one Gd(2), one Gd(3), and two equivalent Cu(1) atoms. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one Ba(3), one Ba(4), one Gd(2), one Gd(3), and two equivalent Cu(2) atoms. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Ba(1), one Ba(2), one Gd(1), one Gd(3), and two equivalent Cu(2) atoms. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to one Ba(1), one Ba(2), one Ba(3), one Ba(4), one Cu(1), and one Cu(3) atom. In the eighth O site, O(8) is bonded to one Ba(1), one Ba(2), one Ba(3), one Ba(4), one Cu(2), and one Cu(4) atom to form a mixture of distorted corner, edge, and face-sharing OBa4Cu2 octahedra. The corner-sharing octahedra are not tilted. In the ninth O site, O(9) is bonded to one Ba(1), one Ba(2), one Ba(3), one Ba(4), and two equivalent Cu(4) atoms to form a mixture of distorted corner and face-sharing OBa4Cu2 octahedra. The corner-sharing octahedra are not tilted. In the tenth O site, O(10) is bonded in a distorted linear geometry to two equivalent Ba(2), two equivalent Ba(3), and two equivalent Cu(3) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ba8Gd4(Cu4O9)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.676
_cell_length_b   8.676
_cell_length_c   12.498
_cell_angle_alpha   74.001
_cell_angle_beta   74.001
_cell_angle_gamma   53.914
_symmetry_Int_Tables_number   1
_cell_volume   722.918
_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  0.177  0.177  0.811  1.0
  Ba  Ba1  1  0.420  0.420  0.818  1.0
  Ba  Ba2  1  0.671  0.671  0.818  1.0
  Ba  Ba3  1  0.917  0.917  0.812  1.0
  Ba  Ba4  1  0.329  0.329  0.182  1.0
  Ba  Ba5  1  0.580  0.580  0.182  1.0
  Ba  Ba6  1  0.823  0.823  0.189  1.0
  Ba  Ba7  1  0.083  0.083  0.188  1.0
  Gd  Gd8  1  0.500  0.500  0.500  1.0
  Gd  Gd9  1  0.000  0.000  0.500  1.0
  Gd  Gd10  1  0.750  0.750  0.501  1.0
  Gd  Gd11  1  0.250  0.250  0.499  1.0
  Cu  Cu12  1  0.338  0.839  0.644  1.0
  Cu  Cu13  1  0.839  0.338  0.644  1.0
  Cu  Cu14  1  0.589  0.089  0.645  1.0
  Cu  Cu15  1  0.089  0.589  0.645  1.0
  Cu  Cu16  1  0.411  0.911  0.355  1.0
  Cu  Cu17  1  0.911  0.411  0.355  1.0
  Cu  Cu18  1  0.662  0.161  0.356  1.0
  Cu  Cu19  1  0.161  0.662  0.356  1.0
  Cu  Cu20  1  0.261  0.739  0.000  1.0
  Cu  Cu21  1  0.739  0.261  0.000  1.0
  Cu  Cu22  1  0.500  0.000  0.000  1.0
  Cu  Cu23  1  0.000  0.500  0.000  1.0
  O  O24  1  0.219  0.719  0.624  1.0
  O  O25  1  0.719  0.219  0.624  1.0
  O  O26  1  0.469  0.969  0.624  1.0
  O  O27  1  0.969  0.469  0.624  1.0
  O  O28  1  0.281  0.781  0.376  1.0
  O  O29  1  0.781  0.281  0.376  1.0
  O  O30  1  0.531  0.031  0.376  1.0
  O  O31  1  0.031  0.531  0.376  1.0
  O  O32  1  0.594  0.594  0.624  1.0
  O  O33  1  0.095  0.095  0.622  1.0
  O  O34  1  0.844  0.844  0.624  1.0
  O  O35  1  0.344  0.344  0.623  1.0
  O  O36  1  0.656  0.656  0.377  1.0
  O  O37  1  0.156  0.156  0.376  1.0
  O  O38  1  0.905  0.905  0.378  1.0
  O  O39  1  0.406  0.406  0.376  1.0
  O  O40  1  0.270  0.806  0.848  1.0
  O  O41  1  0.806  0.270  0.848  1.0
  O  O42  1  0.540  0.040  0.842  1.0
  O  O43  1  0.040  0.540  0.842  1.0
  O  O44  1  0.460  0.960  0.158  1.0
  O  O45  1  0.960  0.460  0.158  1.0
  O  O46  1  0.730  0.194  0.152  1.0
  O  O47  1  0.194  0.730  0.152  1.0
  O  O48  1  0.249  0.249  0.000  1.0
  O  O49  1  0.500  0.500  0.000  1.0
  O  O50  1  0.751  0.751  1.000  1.0
[/CIF]
.