data_CrGePb2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.19
_cell_length_b   5.19
_cell_length_c   5.19
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   CrGePb2
_chemical_formula_sum   'Cr1 Ge1 Pb2'
_cell_volume   98.96
_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
  Cr  Cr0  1  0.0  0.0  0.0  1.0
  Ge  Ge1  1  0.51  0.51  0.51  1.0
  Pb  Pb2  1  0.67  0.67  0.67  1.0
  Pb  Pb3  1  0.84  0.84  0.84  1.0

data_CrGePb2
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.19
_cell_length_b   5.19
_cell_length_c   12.72
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   CrGePb2
_chemical_formula_sum   'Cr3 Ge3 Pb6'
_cell_volume   296.87
_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
  Cr  Cr0  3  0.0  0.0  0.0  1.0
  Ge  Ge1  3  0.0  0.0  0.49  1.0
  Pb  Pb2  3  0.0  0.0  0.16  1.0
  Pb  Pb3  3  0.0  0.0  0.33  1.0

Cr Ge Pb Pb
Cr Ge Pb Pb 0 3 - - - 1 2 o o o 2 3 o o o 
CrPb2Ge crystallizes in the trigonal R3m space group. Cr(1) is bonded to one Pb(2) and three equivalent Pb(1) atoms to form distorted CrPb4 trigonal pyramids that share  a cornercorner with one Pb(1)Cr3GePb trigonal bipyramid, corners with three equivalent Pb(2)CrGe3Pb trigonal bipyramids, corners with six equivalent Cr(1)Pb4 trigonal pyramids, and edges with three equivalent Ge(1)Pb4 trigonal pyramids. The Cr(1)-Pb(2) bond length is 2.09 Å. All Cr(1)-Pb(1) bond lengths are 3.00 Å. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded to three equivalent Cr(1), one Pb(2), and one Ge(1) atom to form PbCr3GePb trigonal bipyramids that share corners with six equivalent Pb(1)Cr3GePb trigonal bipyramids,  a cornercorner with one Cr(1)Pb4 trigonal pyramid, corners with three equivalent Ge(1)Pb4 trigonal pyramids, and edges with three equivalent Pb(2)CrGe3Pb trigonal bipyramids. The Pb(1)-Pb(2) bond length is 2.09 Å. The Pb(1)-Ge(1) bond length is 2.09 Å. In the second Pb site, Pb(2) is bonded to one Cr(1), one Pb(1), and three equivalent Ge(1) atoms to form distorted PbCrGe3Pb trigonal bipyramids that share corners with six equivalent Pb(2)CrGe3Pb trigonal bipyramids,  a cornercorner with one Ge(1)Pb4 trigonal pyramid, corners with three equivalent Cr(1)Pb4 trigonal pyramids, and edges with three equivalent Pb(1)Cr3GePb trigonal bipyramids. All Pb(2)-Ge(1) bond lengths are 3.00 Å. Ge(1) is bonded to one Pb(1) and three equivalent Pb(2) atoms to form distorted GePb4 trigonal pyramids that share  a cornercorner with one Pb(2)CrGe3Pb trigonal bipyramid, corners with three equivalent Pb(1)Cr3GePb trigonal bipyramids, corners with six equivalent Ge(1)Pb4 trigonal pyramids, and edges with three equivalent Cr(1)Pb4 trigonal pyramids.