data_Rb2AsO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.17
_cell_length_b   7.17
_cell_length_c   7.17
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Rb2AsO4
_chemical_formula_sum   'Rb4 As2 O8'
_cell_volume   261.08
_cell_formula_units_Z   2
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  Rb10  1  0.8  0.8  0.34  1.0
  Rb  Rb11  1  0.34  0.34  0.34  1.0
  Rb  Rb12  1  0.8  0.34  0.8  1.0
  Rb  Rb13  1  0.34  0.8  0.8  1.0
  As  As0  1  0.0  0.0  0.0  1.0
  As  As1  1  0.54  0.54  0.54  1.0
  O  O2  1  0.07  0.07  0.15  1.0
  O  O3  1  0.53  0.53  0.53  1.0
  O  O4  1  0.53  0.61  0.61  1.0
  O  O5  1  0.61  0.53  0.61  1.0
  O  O6  1  0.07  0.15  0.07  1.0
  O  O7  1  0.15  0.15  0.15  1.0
  O  O8  1  0.15  0.07  0.07  1.0
  O  O9  1  0.61  0.61  0.53  1.0

data_Rb2AsO4
_symmetry_space_group_name_H-M   R3m
_cell_length_a   7.17
_cell_length_b   7.17
_cell_length_c   17.57
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   Rb2AsO4
_chemical_formula_sum   'Rb12 As6 O24'
_cell_volume   783.24
_cell_formula_units_Z   6
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  9  0.18  0.82  0.02  1.0
  Rb  Rb1  3  0.0  0.0  0.66  1.0
  As  As2  3  0.0  0.0  0.0  1.0
  As  As3  3  0.0  0.0  0.46  1.0
  O  O4  9  0.03  0.06  0.9  1.0
  O  O5  9  0.06  0.03  0.41  1.0
  O  O6  3  0.0  0.0  0.47  1.0
  O  O7  3  0.0  0.0  0.85  1.0

Rb Rb Rb Rb As As O O O O O O O O
Rb Rb Rb Rb As As O O O O O O O O 0 13 o o o 0 9 o o o 0 8 o o o 0 4 + + o 0 1 + o o 0 1 o + o 1 12 o o o 1 12 o o + 1 12 o + o 1 11 o o o 1 10 o o o 1 10 o o + 1 10 + o o 1 6 o o o 1 6 o + o 1 6 + o o 1 4 o o + 1 4 o + o 1 4 + o o 1 8 o - o 1 8 o o - 1 8 o o o 1 3 o - o 1 3 o o - 1 13 - o o 1 13 o - o 1 13 o o o 1 9 - o o 1 9 o o - 1 9 o o o 1 2 - o o 1 2 o o - 1 7 o o o 1 5 o o o 2 13 o o o 2 9 o o o 2 8 o o o 2 4 + o + 3 4 o + + 3 13 o o o 3 9 o o o 3 8 o o o 4 12 o o o 4 10 o o o 4 6 o o o 5 7 o o o 6 12 o o o 6 10 o o o 6 11 o o o 8 9 o o o 8 13 o o o 9 13 o o o 10 12 o o o 10 11 o o o 11 12 o o o 
Rb2AsO4 crystallizes in the trigonal R3m space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 1-coordinate geometry to one As(1), one O(1), and one O(3) atom. The Rb(1)-As(1) bond length is 2.24 Å. The Rb(1)-O(1) bond length is 2.72 Å. The Rb(1)-O(3) bond length is 1.93 Å. In the second Rb site, Rb(2) is bonded in a linear geometry to one O(2) and one O(4) atom. The Rb(2)-O(2) bond length is 3.34 Å. The Rb(2)-O(4) bond length is 3.34 Å. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 6-coordinate geometry to three equivalent Rb(1) and three equivalent O(1) atoms. All As(1)-O(1) bond lengths are 1.71 Å. In the second As site, As(2) is bonded in a distorted single-bond geometry to one O(2) and three equivalent O(3) atoms. The As(2)-O(2) bond length is 0.10 Å. All As(2)-O(3) bond lengths are 0.95 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Rb(1), one As(1), one O(4), and two equivalent O(1) atoms. The O(1)-O(4) bond length is 1.04 Å. Both O(1)-O(1) bond lengths are 0.60 Å. In the second O site, O(2) is bonded in a single-bond geometry to one Rb(2) and one As(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Rb(1), one As(2), and two equivalent O(3) atoms. Both O(3)-O(3) bond lengths are 0.60 Å. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Rb(2) and three equivalent O(1) atoms.