data_SrAlP3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.78
_cell_length_b   4.78
_cell_length_c   4.78
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SrAlP3
_chemical_formula_sum   'Sr1 Al1 P3'
_cell_volume   108.88
_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  Sr0  1  0.39  0.39  0.39  1.0
  Al  Al1  1  0.0  0.0  0.0  1.0
  P  P2  1  0.0  0.39  0.0  1.0
  P  P3  1  0.0  0.0  0.39  1.0
  P  P4  1  0.39  0.0  0.0  1.0

data_SrAlP3
_symmetry_space_group_name_H-M   R3m
_cell_length_a   6.75
_cell_length_b   6.75
_cell_length_c   8.27
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   SrAlP3
_chemical_formula_sum   'Sr3 Al3 P9'
_cell_volume   326.65
_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  0.39  1.0
  Al  Al1  3  0.0  0.0  0.0  1.0
  P  P2  9  0.2  0.41  0.8  1.0

Sr Al P P P
SrAlP3 crystallizes in the trigonal R3m space group. Sr(1) is bonded in a 9-coordinate geometry to nine equivalent P(1) atoms. There are three shorter (2.62 Å) and six longer (3.46 Å) Sr(1)-P(1) bond lengths. Al(1) is bonded in a 3-coordinate geometry to three equivalent P(1) atoms. All Al(1)-P(1) bond lengths are 1.85 Å. P(1) is bonded in a 1-coordinate geometry to three equivalent Sr(1) and one Al(1) atom.