data_BeSiAg2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.68
_cell_length_b   8.68
_cell_length_c   8.68
_cell_angle_alpha   18.9
_cell_angle_beta   18.9
_cell_angle_gamma   18.9
_symmetry_Int_Tables_number   1
_chemical_formula_structural   BeSiAg2
_chemical_formula_sum   'Be1 Si1 Ag2'
_cell_volume   60.03
_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
  Be  Be2  1  0.0  0.0  0.0  1.0
  Si  Si3  1  0.0  0.0  0.79  1.0
  Ag  Ag0  1  0.0  0.0  0.6  1.0
  Ag  Ag1  1  0.0  0.0  0.98  1.0

data_BeSiAg2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.94
_cell_length_b   2.85
_cell_length_c   8.68
_cell_angle_alpha   90.0
_cell_angle_beta   100.93
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   BeSiAg2
_chemical_formula_sum   'Be2 Si2 Ag4'
_cell_volume   120.07
_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
  Be  Be0  2  0.0  0.0  0.0  1.0
  Si  Si1  2  0.0  0.0  0.21  1.0
  Ag  Ag2  2  0.0  0.0  0.02  1.0
  Ag  Ag3  2  0.0  0.0  0.4  1.0

Be Si Ag Ag
Be Si Ag Ag 0 3 o o - 0 1 o o - 1 2 o o o 1 3 o o o 
BeAg2Si is Cyanogen Chloride-like structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two BeAg2Si clusters. Be(1) is bonded in a single-bond geometry to one Ag(2) atom. The Be(1)-Ag(2) bond length is 0.19 Å. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a single-bond geometry to one Si(1) atom. The Ag(1)-Si(1) bond length is 1.65 Å. In the second Ag site, Ag(2) is bonded in a single-bond geometry to one Be(1) and one Si(1) atom. The Ag(2)-Si(1) bond length is 1.65 Å. Si(1) is bonded in a linear geometry to one Ag(1) and one Ag(2) atom.