data_KMg2Pb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.08
_cell_length_b   5.08
_cell_length_c   4.7
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   KMg2Pb
_chemical_formula_sum   'K1 Mg2 Pb1'
_cell_volume   121.24
_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  K0  1  0.0  0.0  0.0  1.0
  Mg  Mg1  1  0.0  0.54  0.35  1.0
  Mg  Mg2  1  0.54  0.0  0.35  1.0
  Pb  Pb3  1  0.54  0.54  0.0  1.0

data_KMg2Pb
_symmetry_space_group_name_H-M   Cm
_cell_length_a   7.18
_cell_length_b   7.18
_cell_length_c   4.7
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   KMg2Pb
_chemical_formula_sum   'K2 Mg4 Pb2'
_cell_volume   242.48
_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  0.0  1.0
  Mg  Mg1  4  0.27  0.27  0.35  1.0
  Pb  Pb2  2  0.04  0.5  0.0  1.0

K Mg Mg Pb
KMg2Pb crystallizes in the monoclinic Cm space group. K(1) is bonded in a 12-coordinate geometry to eight equivalent Mg(1) and four equivalent Pb(1) atoms. There are a spread of K(1)-Mg(1) bond distances ranging from 2.86-4.10 Å. There are a spread of K(1)-Pb(1) bond distances ranging from 3.31-3.87 Å. Mg(1) is bonded in a 4-coordinate geometry to four equivalent K(1) and two equivalent Pb(1) atoms. There is one shorter (2.86 Å) and one longer (3.20 Å) Mg(1)-Pb(1) bond length. Pb(1) is bonded in a 8-coordinate geometry to four equivalent K(1) and four equivalent Mg(1) atoms.