data_Na2MgCd
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.57
_cell_length_b   4.57
_cell_length_c   5.1
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Na2MgCd
_chemical_formula_sum   'Na2 Mg1 Cd1'
_cell_volume   106.61
_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
  Na  Na2  1  0.0  0.29  0.55  1.0
  Na  Na3  1  0.29  0.0  0.55  1.0
  Mg  Mg1  1  0.0  0.0  0.0  1.0
  Cd  Cd0  1  0.29  0.29  0.0  1.0

data_Na2MgCd
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.47
_cell_length_b   6.47
_cell_length_c   5.1
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Na2MgCd
_chemical_formula_sum   'Na4 Mg2 Cd2'
_cell_volume   213.21
_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
  Na  Na0  4  0.14  0.14  0.55  1.0
  Mg  Mg1  2  0.0  0.0  0.0  1.0
  Cd  Cd2  2  0.29  0.0  -0.0  1.0

Na Na Mg Cd
Na2MgCd crystallizes in the monoclinic Cm space group. Na(1) is bonded in a 7-coordinate geometry to three equivalent Na(1), two equivalent Mg(1), and two equivalent Cd(1) atoms. There is one shorter (1.85 Å) and two longer (3.52 Å) Na(1)-Na(1) bond lengths. There is one shorter (2.65 Å) and one longer (3.09 Å) Na(1)-Mg(1) bond length. There is one shorter (2.65 Å) and one longer (3.09 Å) Na(1)-Cd(1) bond length. Mg(1) is bonded in a distorted single-bond geometry to four equivalent Na(1) and one Cd(1) atom. The Mg(1)-Cd(1) bond length is 1.85 Å. Cd(1) is bonded in a distorted single-bond geometry to four equivalent Na(1) and one Mg(1) atom.