data_AlRh2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.78
_cell_length_b   5.78
_cell_length_c   5.78
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   AlRh2
_chemical_formula_sum   'Al4 Rh8'
_cell_volume   193.47
_cell_formula_units_Z   4
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
  Al  Al0  1  0.89  0.0  0.89  1.0
  Al  Al1  1  0.0  0.89  0.89  1.0
  Al  Al2  1  0.0  0.0  0.0  1.0
  Al  Al3  1  0.89  0.89  0.0  1.0
  Rh  Rh4  1  0.73  0.62  0.05  1.0
  Rh  Rh5  1  0.05  0.16  0.73  1.0
  Rh  Rh6  1  0.62  0.05  0.73  1.0
  Rh  Rh7  1  0.16  0.73  0.05  1.0
  Rh  Rh8  1  0.05  0.73  0.62  1.0
  Rh  Rh9  1  0.73  0.05  0.16  1.0
  Rh  Rh10  1  0.16  0.16  0.16  1.0
  Rh  Rh11  1  0.62  0.62  0.62  1.0

data_AlRh2
_symmetry_space_group_name_H-M   R3
_cell_length_a   8.18
_cell_length_b   8.18
_cell_length_c   10.02
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   146
_chemical_formula_structural   AlRh2
_chemical_formula_sum   'Al12 Rh24'
_cell_volume   580.41
_cell_formula_units_Z   12
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  'x+1/3, y+2/3, z+2/3'
  5  '-y+1/3, x-y+2/3, z+2/3'
  6  '-x+y+1/3, -x+2/3, z+2/3'
  7  'x+2/3, y+1/3, z+1/3'
  8  '-y+2/3, x-y+1/3, z+1/3'
  9  '-x+y+2/3, -x+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
  Al  Al0  9  0.07  0.04  0.93  1.0
  Al  Al1  3  0.0  0.0  0.0  1.0
  Rh  Rh2  9  0.07  0.25  0.98  1.0
  Rh  Rh3  9  0.16  0.74  0.47  1.0
  Rh  Rh4  3  0.0  0.0  0.16  1.0
  Rh  Rh5  3  0.0  0.0  0.62  1.0

Al Al Al Al Rh Rh Rh Rh Rh Rh Rh Rh
Al Al Al Al Rh Rh Rh Rh Rh Rh Rh Rh 0 1 + - o 0 3 o - + 0 2 + o + 0 5 + o o 0 6 o o o 0 9 o o + 0 11 o - o 1 3 - o + 1 2 o + + 1 5 o + o 1 7 o o + 1 8 o o o 1 11 - o o 2 3 - - o 2 5 o o - 2 7 o - o 2 9 - o o 2 10 o o o 3 4 o o o 3 7 + o o 3 9 o + o 3 11 o o - 4 11 o o - 6 11 o - o 8 11 - o o 
Rh2Al crystallizes in the trigonal R3 space group. There are four inequivalent Rh sites. In the first Rh site, Rh(1) is bonded in a single-bond geometry to two equivalent Rh(4) and one Al(1) atom. There is one shorter (2.54 Å) and one longer (3.38 Å) Rh(1)-Rh(4) bond length. The Rh(1)-Al(1) bond length is 1.82 Å. In the second Rh site, Rh(2) is bonded in a distorted single-bond geometry to one Al(1) atom. The Rh(2)-Al(1) bond length is 1.59 Å. In the third Rh site, Rh(3) is bonded in a single-bond geometry to one Al(2) atom. The Rh(3)-Al(2) bond length is 1.59 Å. In the fourth Rh site, Rh(4) is bonded in a 6-coordinate geometry to six equivalent Rh(1) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 5-coordinate geometry to one Rh(1), one Rh(2), one Al(2), and two equivalent Al(1) atoms. The Al(1)-Al(2) bond length is 0.88 Å. Both Al(1)-Al(1) bond lengths are 0.88 Å. In the second Al site, Al(2) is bonded in a 4-coordinate geometry to one Rh(3) and three equivalent Al(1) atoms.