data_SrP2Pb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.2
_cell_length_b   5.2
_cell_length_c   5.2
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SrP2Pb
_chemical_formula_sum   'Sr1 P2 Pb1'
_cell_volume   99.4
_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
  Sr  Sr3  1  0.0  0.0  0.0  1.0
  P  P0  1  0.84  0.84  0.84  1.0
  P  P1  1  0.52  0.52  0.52  1.0
  Pb  Pb2  1  0.68  0.68  0.68  1.0

data_SrP2Pb
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.2
_cell_length_b   5.2
_cell_length_c   12.74
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   SrP2Pb
_chemical_formula_sum   'Sr3 P6 Pb3'
_cell_volume   298.21
_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
  Sr  Sr0  3  0.0  0.0  0.0  1.0
  P  P1  3  0.0  0.0  0.16  1.0
  P  P2  3  0.0  0.0  0.48  1.0
  Pb  Pb3  3  0.0  0.0  0.32  1.0

Sr P P Pb
Sr P P Pb 0 1 - - - 1 3 o o o 2 3 o o o 
SrPbP2 crystallizes in the trigonal R3m space group. Sr(1) is bonded to three equivalent Pb(1) and one P(1) atom to form distorted SrPPb3 trigonal pyramids that share  a cornercorner with one Pb(1)Sr3P2 trigonal bipyramid and corners with six equivalent Sr(1)PPb3 trigonal pyramids. All Sr(1)-Pb(1) bond lengths are 3.00 Å. The Sr(1)-P(1) bond length is 2.06 Å. Pb(1) is bonded to three equivalent Sr(1), one P(1), and one P(2) atom to form PbSr3P2 trigonal bipyramids that share corners with six equivalent Pb(1)Sr3P2 trigonal bipyramids and  a cornercorner with one Sr(1)PPb3 trigonal pyramid. The Pb(1)-P(1) bond length is 2.06 Å. The Pb(1)-P(2) bond length is 2.06 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded in a linear geometry to one Sr(1) and one Pb(1) atom. In the second P site, P(2) is bonded in a single-bond geometry to one Pb(1) atom.