data_K2MgCd
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.06
_cell_length_b   4.06
_cell_length_c   10.16
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   K2MgCd
_chemical_formula_sum   'K2 Mg1 Cd1'
_cell_volume   167.09
_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
  K  K1  1  0.0  0.0  0.46  1.0
  K  K2  1  0.03  0.03  0.17  1.0
  Mg  Mg3  1  0.0  0.0  0.86  1.0
  Cd  Cd0  1  0.03  0.03  0.9  1.0

data_K2MgCd
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.74
_cell_length_b   5.74
_cell_length_c   10.16
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   K2MgCd
_chemical_formula_sum   'K4 Mg2 Cd2'
_cell_volume   334.18
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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
  K  K0  2  0.0  0.0  0.46  1.0
  K  K1  2  0.03  0.0  0.17  1.0
  Mg  Mg2  2  0.0  0.0  0.86  1.0
  Cd  Cd3  2  0.03  0.0  0.9  1.0

K K Mg Cd
K2MgCd crystallizes in the monoclinic Cm space group. There are two inequivalent K sites. In the first K site, K(1) is bonded to one K(2), four equivalent K(1), and one Mg(1) atom to form a mixture of distorted corner and edge-sharing KK5Mg octahedra. The corner-sharing octahedra are not tilted. The K(1)-K(2) bond length is 2.93 Å. All K(1)-K(1) bond lengths are 4.06 Å. The K(1)-Mg(1) bond length is 4.01 Å. In the second K site, K(2) is bonded in a distorted single-bond geometry to one K(1) and one Cd(1) atom. The K(2)-Cd(1) bond length is 2.75 Å. Mg(1) is bonded in a single-bond geometry to one K(1) and one Cd(1) atom. The Mg(1)-Cd(1) bond length is 0.49 Å. Cd(1) is bonded in a distorted single-bond geometry to one K(2) and one Mg(1) atom.