data_K2BeBi
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.68
_cell_length_b   3.68
_cell_length_c   9.92
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   K2BeBi
_chemical_formula_sum   'K2 Be1 Bi1'
_cell_volume   134.3
_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  K2  1  0.84  0.84  0.59  1.0
  K  K3  1  0.84  0.84  0.33  1.0
  Be  Be0  1  0.0  0.0  0.0  1.0
  Bi  Bi1  1  0.0  0.0  0.96  1.0

data_K2BeBi
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.2
_cell_length_b   5.2
_cell_length_c   9.92
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   K2BeBi
_chemical_formula_sum   'K4 Be2 Bi2'
_cell_volume   268.59
_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
  K  K0  2  0.34  0.5  0.33  1.0
  K  K1  2  0.34  0.5  0.59  1.0
  Be  Be2  2  0.0  0.0  0.0  1.0
  Bi  Bi3  2  0.0  0.0  0.96  1.0

K K Be Bi
K2BeBi crystallizes in the monoclinic Cm space group. There are two inequivalent K sites. In the first K site, K(1) is bonded to one K(2), four equivalent K(1), and one Bi(1) atom to form a mixture of distorted corner and edge-sharing KK5Bi octahedra. The corner-sharing octahedra are not tilted. The K(1)-K(2) bond length is 2.60 Å. All K(1)-K(1) bond lengths are 3.68 Å. The K(1)-Bi(1) bond length is 3.76 Å. In the second K site, K(2) is bonded in a 6-coordinate geometry to one K(1), four equivalent K(2), and one Be(1) atom. All K(2)-K(2) bond lengths are 3.68 Å. The K(2)-Be(1) bond length is 3.39 Å. Be(1) is bonded in a single-bond geometry to one K(2) and one Bi(1) atom. The Be(1)-Bi(1) bond length is 0.38 Å. Bi(1) is bonded in a single-bond geometry to one K(1) and one Be(1) atom.