data_K2BeSi
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.43
_cell_length_b   4.43
_cell_length_c   5.36
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   K2BeSi
_chemical_formula_sum   'K2 Be1 Si1'
_cell_volume   105.04
_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  0.21  0.68  1.0
  K  K2  1  0.21  0.0  0.68  1.0
  Be  Be0  1  0.0  0.0  0.0  1.0
  Si  Si3  1  0.21  0.21  0.0  1.0

data_K2BeSi
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.26
_cell_length_b   6.26
_cell_length_c   5.36
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   K2BeSi
_chemical_formula_sum   'K4 Be2 Si2'
_cell_volume   210.08
_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  4  0.11  0.11  0.68  1.0
  Be  Be1  2  0.0  0.0  0.0  1.0
  Si  Si2  2  0.21  0.0  -0.0  1.0

K K Be Si
K2BeSi is alpha Po structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two K2BeSi clusters. K(1) is bonded in a 3-coordinate geometry to one K(1), one Be(1), and one Si(1) atom. The K(1)-K(1) bond length is 1.33 Å. The K(1)-Be(1) bond length is 1.95 Å. The K(1)-Si(1) bond length is 1.95 Å. Be(1) is bonded in a 3-coordinate geometry to two equivalent K(1) and one Si(1) atom. The Be(1)-Si(1) bond length is 1.33 Å. Si(1) is bonded in a 3-coordinate geometry to two equivalent K(1) and one Be(1) atom.