data_MgPtPb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.6
_cell_length_b   4.6
_cell_length_c   4.6
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   MgPtPb
_chemical_formula_sum   'Mg1 Pt1 Pb1'
_cell_volume   68.95
_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
  Mg  Mg0  1  0.0  0.0  0.0  1.0
  Pt  Pt2  1  0.63  0.63  0.63  1.0
  Pb  Pb1  1  0.25  0.25  0.25  1.0

data_MgPtPb
_symmetry_space_group_name_H-M   R3m
_cell_length_a   4.6
_cell_length_b   4.6
_cell_length_c   11.27
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   MgPtPb
_chemical_formula_sum   'Mg3 Pt3 Pb3'
_cell_volume   206.84
_cell_formula_units_Z   3
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-y, x-y, z'
  3  '-x+y, -x, z'
  4  '-y, -x, z'
  5  '-x+y, y, z'
  6  'x, x-y, z'
  7  'x+1/3, y+2/3, z+2/3'
  8  '-y+1/3, x-y+2/3, z+2/3'
  9  '-x+y+1/3, -x+2/3, z+2/3'
  10  '-y+1/3, -x+2/3, z+2/3'
  11  '-x+y+1/3, y+2/3, z+2/3'
  12  'x+1/3, x-y+2/3, z+2/3'
  13  'x+2/3, y+1/3, z+1/3'
  14  '-y+2/3, x-y+1/3, z+1/3'
  15  '-x+y+2/3, -x+1/3, z+1/3'
  16  '-y+2/3, -x+1/3, z+1/3'
  17  '-x+y+2/3, y+1/3, z+1/3'
  18  'x+2/3, x-y+1/3, z+1/3'
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
  Mg  Mg0  3  0.0  0.0  0.0  1.0
  Pt  Pt1  3  0.0  0.0  0.37  1.0
  Pb  Pb2  3  0.0  0.0  0.75  1.0

Mg Pt Pb
Mg Pt Pb 0 1 - - o 0 1 - o - 0 1 o - - 0 2 - o o 0 2 o - o 0 2 o o - 0 2 o o o 1 2 o o + 1 2 o + o 1 2 + o o 
MgPtPb crystallizes in the trigonal R3m space group. Mg(1) is bonded to three equivalent Pt(1) and four equivalent Pb(1) atoms to form a mixture of distorted corner and edge-sharing MgPt3Pb4 hexagonal pyramids. All Mg(1)-Pt(1) bond lengths are 2.69 Å. There are three shorter (2.80 Å) and one longer (2.87 Å) Mg(1)-Pb(1) bond length. Pt(1) is bonded in a distorted hexagonal planar geometry to three equivalent Mg(1) and three equivalent Pb(1) atoms. All Pt(1)-Pb(1) bond lengths are 2.69 Å. Pb(1) is bonded in a 7-coordinate geometry to four equivalent Mg(1) and three equivalent Pt(1) atoms.