The structure described by Ba3Cd2As4 crystallizes in the monoclinic C2/m space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 10-coordinate geometry to three equivalent Cd(1), three equivalent As(1), and four equivalent As(2) atoms. In the second Ba site, Ba(2) is bonded to two equivalent As(1) and four equivalent As(2) atoms to form distorted BaAs6 octahedra that share corners with two equivalent Cd(1)Ba3As4 tetrahedra, edges with two equivalent Ba(2)As6 octahedra, and edges with four equivalent Cd(1)Ba3As4 tetrahedra. Cd(1) is bonded to three equivalent Ba(1), one As(2), and three equivalent As(1) atoms to form distorted CdBa3As4 tetrahedra that share  a cornercorner with one Ba(2)As6 octahedra, edges with two equivalent Ba(2)As6 octahedra, edges with two equivalent Cd(1)Ba3As4 tetrahedra, and faces with two equivalent Cd(1)Ba3As4 tetrahedra. The corner-sharing octahedral tilt angles are 46°. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 7-coordinate geometry to one Ba(2), three equivalent Ba(1), and three equivalent Cd(1) atoms. In the second As site, As(2) is bonded in a 8-coordinate geometry to two equivalent Ba(2), four equivalent Ba(1), one Cd(1), and one As(2) atom. is represented by the CIF card [CIF]
data_Ba3(CdAs2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.932
_cell_length_b   8.932
_cell_length_c   7.377
_cell_angle_alpha   68.592
_cell_angle_beta   68.592
_cell_angle_gamma   30.071
_symmetry_Int_Tables_number   1
_cell_volume   273.010
_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  0.142  0.142  0.422  1.0
  Ba  Ba1  1  0.858  0.858  0.578  1.0
  Ba  Ba2  1  0.000  0.000  0.000  1.0
  Cd  Cd3  1  0.330  0.330  0.972  1.0
  Cd  Cd4  1  0.670  0.670  0.028  1.0
  As  As5  1  0.207  0.207  0.810  1.0
  As  As6  1  0.793  0.793  0.190  1.0
  As  As7  1  0.494  0.494  0.674  1.0
  As  As8  1  0.506  0.506  0.326  1.0
[/CIF]
.
The structure described by Ba3Cd2As4 crystallizes in the monoclinic C2/m space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 10-coordinate geometry to three equivalent Cd(1), three equivalent As(1), and four equivalent As(2) atoms. In the second Ba site, Ba(2) is bonded to two equivalent As(1) and four equivalent As(2) atoms to form distorted BaAs6 octahedra that share corners with two equivalent Cd(1)Ba3As4 tetrahedra, edges with two equivalent Ba(2)As6 octahedra, and edges with four equivalent Cd(1)Ba3As4 tetrahedra. Cd(1) is bonded to three equivalent Ba(1), one As(2), and three equivalent As(1) atoms to form distorted CdBa3As4 tetrahedra that share  a cornercorner with one Ba(2)As6 octahedra, edges with two equivalent Ba(2)As6 octahedra, edges with two equivalent Cd(1)Ba3As4 tetrahedra, and faces with two equivalent Cd(1)Ba3As4 tetrahedra. The corner-sharing octahedral tilt angles are 46°. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 7-coordinate geometry to one Ba(2), three equivalent Ba(1), and three equivalent Cd(1) atoms. In the second As site, As(2) is bonded in a 8-coordinate geometry to two equivalent Ba(2), four equivalent Ba(1), one Cd(1), and one As(2) atom. is represented by the CIF card [CIF]
data_Ba3(CdAs2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.932
_cell_length_b   8.932
_cell_length_c   7.377
_cell_angle_alpha   68.592
_cell_angle_beta   68.592
_cell_angle_gamma   30.071
_symmetry_Int_Tables_number   1
_cell_volume   273.010
_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  0.142  0.142  0.422  1.0
  Ba  Ba1  1  0.858  0.858  0.578  1.0
  Ba  Ba2  1  0.000  0.000  0.000  1.0
  Cd  Cd3  1  0.330  0.330  0.972  1.0
  Cd  Cd4  1  0.670  0.670  0.028  1.0
  As  As5  1  0.207  0.207  0.810  1.0
  As  As6  1  0.793  0.793  0.190  1.0
  As  As7  1  0.494  0.494  0.674  1.0
  As  As8  1  0.506  0.506  0.326  1.0
[/CIF]
.