data_BeCrSi2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.04
_cell_length_b   3.04
_cell_length_c   4.9
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   BeCrSi2
_chemical_formula_sum   'Be1 Cr1 Si2'
_cell_volume   45.4
_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  Be0  1  0.0  0.0  0.0  1.0
  Cr  Cr1  1  0.0  0.0  0.45  1.0
  Si  Si2  1  0.52  0.52  0.69  1.0
  Si  Si3  1  0.52  0.52  0.21  1.0

data_BeCrSi2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.31
_cell_length_b   4.31
_cell_length_c   4.9
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   BeCrSi2
_chemical_formula_sum   'Be2 Cr2 Si4'
_cell_volume   90.8
_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
  Cr  Cr1  2  0.0  0.0  0.45  1.0
  Si  Si2  2  0.02  0.5  0.21  1.0
  Si  Si3  2  0.02  0.5  0.69  1.0

Be Cr Si Si
BeCrSi2 is Titanium Disilicide-derived structured and crystallizes in the monoclinic Cm space group. Be(1) is bonded in a 10-coordinate geometry to two equivalent Cr(1), four equivalent Si(1), and four equivalent Si(2) atoms. There is one shorter (2.20 Å) and one longer (2.70 Å) Be(1)-Cr(1) bond length. There are a spread of Be(1)-Si(1) bond distances ranging from 2.56-2.72 Å. There are a spread of Be(1)-Si(2) bond distances ranging from 2.30-2.47 Å. Cr(1) is bonded in a 10-coordinate geometry to two equivalent Be(1), four equivalent Si(1), and four equivalent Si(2) atoms. There are a spread of Cr(1)-Si(1) bond distances ranging from 2.36-2.53 Å. There are a spread of Cr(1)-Si(2) bond distances ranging from 2.36-2.53 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 10-coordinate geometry to four equivalent Be(1), four equivalent Cr(1), and two equivalent Si(2) atoms. There is one shorter (2.33 Å) and one longer (2.56 Å) Si(1)-Si(2) bond length. In the second Si site, Si(2) is bonded in a 10-coordinate geometry to four equivalent Be(1), four equivalent Cr(1), and two equivalent Si(1) atoms.