data_Ta2BeSi
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.35
_cell_length_b   4.35
_cell_length_c   3.08
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ta2BeSi
_chemical_formula_sum   'Ta2 Be1 Si1'
_cell_volume   58.49
_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
  Ta  Ta2  1  0.18  0.0  0.54  1.0
  Ta  Ta3  1  0.0  0.18  0.54  1.0
  Be  Be0  1  0.0  0.0  0.0  1.0
  Si  Si1  1  0.18  0.18  0.0  1.0

data_Ta2BeSi
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.16
_cell_length_b   6.16
_cell_length_c   3.08
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Ta2BeSi
_chemical_formula_sum   'Ta4 Be2 Si2'
_cell_volume   116.98
_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
  Ta  Ta0  4  0.09  0.09  0.54  1.0
  Be  Be1  2  0.0  0.0  0.0  1.0
  Si  Si2  2  0.18  0.0  0.0  1.0

Ta Ta Be Si
BeSi(Ta)2 crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two BeSi clusters and two Ta clusters. In each BeSi cluster, Be(1) is bonded in a single-bond geometry to one Si(1) atom. The Be(1)-Si(1) bond length is 1.09 Å. Si(1) is bonded in a single-bond geometry to one Be(1) atom. In each Ta cluster, Ta(1) is bonded in a 1-coordinate geometry to one Ta(1) atom. The Ta(1)-Ta(1) bond length is 1.09 Å.