data_Be2AlIr
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.39
_cell_length_b   4.39
_cell_length_c   4.39
_cell_angle_alpha   132.25
_cell_angle_beta   132.25
_cell_angle_gamma   69.83
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Be2AlIr
_chemical_formula_sum   'Be2 Al1 Ir1'
_cell_volume   45.59
_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
  Be  Be1  1  0.0  0.78  0.8  1.0
  Be  Be2  1  0.78  0.0  0.8  1.0
  Al  Al0  1  0.0  0.0  0.0  1.0
  Ir  Ir3  1  0.0  0.0  0.6  1.0

data_Be2AlIr
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.03
_cell_length_b   5.03
_cell_length_c   4.39
_cell_angle_alpha   90.0
_cell_angle_beta   124.91
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Be2AlIr
_chemical_formula_sum   'Be4 Al2 Ir2'
_cell_volume   91.19
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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
  Be  Be0  4  0.09  0.11  0.98  1.0
  Al  Al1  2  0.0  0.0  0.0  1.0
  Ir  Ir2  2  0.4  0.0  0.4  1.0

Be Be Al Ir
Be2IrAl crystallizes in the monoclinic Cm space group. Be(1) is bonded in a distorted single-bond geometry to two equivalent Ir(1) and one Al(1) atom. There is one shorter (1.69 Å) and one longer (2.91 Å) Be(1)-Ir(1) bond length. The Be(1)-Al(1) bond length is 0.75 Å. Ir(1) is bonded in a 6-coordinate geometry to four equivalent Be(1) and two equivalent Al(1) atoms. There is one shorter (1.74 Å) and one longer (2.65 Å) Ir(1)-Al(1) bond length. Al(1) is bonded in an L-shaped geometry to two equivalent Be(1) and two equivalent Ir(1) atoms.