data_SrBeAl
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.71
_cell_length_b   4.71
_cell_length_c   4.71
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SrBeAl
_chemical_formula_sum   'Sr1 Be1 Al1'
_cell_volume   73.9
_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  Sr2  1  1.0  1.0  1.0  1.0
  Be  Be1  1  0.0  0.0  0.0  1.0
  Al  Al0  1  0.67  0.67  0.67  1.0

data_SrBeAl
_symmetry_space_group_name_H-M   R3m
_cell_length_a   4.71
_cell_length_b   4.71
_cell_length_c   11.54
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   SrBeAl
_chemical_formula_sum   'Sr3 Be3 Al3'
_cell_volume   221.71
_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
  Be  Be1  3  0.0  0.0  -0.0  1.0
  Al  Al2  3  0.0  0.0  0.33  1.0

Sr Be Al 0 1 + + + 0 2 + o o 0 2 o + o 0 2 o o + 1 2 o - - 1 2 - o - 1 2 - - o 
SrBeAl crystallizes in the trigonal R3m space group. Sr(1) is bonded in a single-bond geometry to one Be(1) and four equivalent Al(1) atoms. The Sr(1)-Be(1) bond length is 0.04 Å. There are three shorter (2.72 Å) and one longer (3.82 Å) Sr(1)-Al(1) bond length. Be(1) is bonded in a single-bond geometry to one Sr(1) and three equivalent Al(1) atoms. All Be(1)-Al(1) bond lengths are 2.72 Å. Al(1) is bonded to four equivalent Sr(1) and three equivalent Be(1) atoms to form a mixture of corner and edge-sharing AlSr4Be3 hexagonal pyramids.