data_K3RbY
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.06
_cell_length_b   7.06
_cell_length_c   7.06
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   K3RbY
_chemical_formula_sum   'K3 Rb1 Y1'
_cell_volume   351.42
_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
  K  K1  1  0.0  0.53  0.0  1.0
  K  K2  1  0.0  0.0  0.53  1.0
  K  K3  1  0.53  0.0  0.0  1.0
  Rb  Rb4  1  0.0  0.0  0.0  1.0
  Y  Y0  1  0.53  0.53  0.53  1.0

data_K3RbY
_symmetry_space_group_name_H-M   R3m
_cell_length_a   9.98
_cell_length_b   9.98
_cell_length_c   12.22
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   K3RbY
_chemical_formula_sum   'K9 Rb3 Y3'
_cell_volume   1054.26
_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
  K  K0  9  0.02  0.51  0.51  1.0
  Rb  Rb1  3  0.0  0.0  0.0  1.0
  Y  Y2  3  0.0  0.0  0.53  1.0

K K K Rb Y
RbK3Y is (Cubic) Perovskite structured and crystallizes in the trigonal R3m space group. Rb(1) is bonded to six equivalent K(1) atoms to form corner-sharing RbK6 octahedra. The corner-sharing octahedra are not tilted. There are three shorter (3.33 Å) and three longer (3.73 Å) Rb(1)-K(1) bond lengths. K(1) is bonded in a distorted linear geometry to two equivalent Rb(1) and one Y(1) atom. The K(1)-Y(1) bond length is 4.71 Å. Y(1) is bonded in a 3-coordinate geometry to three equivalent K(1) atoms.