data_RbAlAg2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.19
_cell_length_b   5.19
_cell_length_c   5.19
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   RbAlAg2
_chemical_formula_sum   'Rb1 Al1 Ag2'
_cell_volume   98.73
_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
  Rb  Rb3  1  0.67  0.67  0.67  1.0
  Al  Al2  1  0.0  0.0  0.0  1.0
  Ag  Ag0  1  0.5  0.5  0.5  1.0
  Ag  Ag1  1  0.83  0.83  0.83  1.0

data_RbAlAg2
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.19
_cell_length_b   5.19
_cell_length_c   12.71
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   RbAlAg2
_chemical_formula_sum   'Rb3 Al3 Ag6'
_cell_volume   296.19
_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
  Rb  Rb0  3  0.0  0.0  0.33  1.0
  Al  Al1  3  0.0  0.0  0.0  1.0
  Ag  Ag2  3  0.0  0.0  0.17  1.0
  Ag  Ag3  3  0.0  0.0  0.5  1.0

Rb Al Ag Ag
Rb Al Ag Ag 0 2 o o o 0 3 o o o 1 3 - - - 
RbAg2Al crystallizes in the trigonal R3m space group. Rb(1) is bonded in a distorted linear geometry to one Ag(1), one Ag(2), and three equivalent Al(1) atoms. The Rb(1)-Ag(1) bond length is 2.11 Å. The Rb(1)-Ag(2) bond length is 2.11 Å. All Rb(1)-Al(1) bond lengths are 3.00 Å. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a single-bond geometry to one Rb(1) atom. In the second Ag site, Ag(2) is bonded in a distorted linear geometry to one Rb(1) and one Al(1) atom. The Ag(2)-Al(1) bond length is 2.11 Å. Al(1) is bonded to three equivalent Rb(1) and one Ag(2) atom to form corner-sharing AlRb3Ag trigonal pyramids.