data_CrSi2Ni
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.55
_cell_length_b   2.55
_cell_length_c   7.42
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   CrSi2Ni
_chemical_formula_sum   'Cr1 Si2 Ni1'
_cell_volume   48.23
_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
  Cr  Cr0  1  0.0  0.0  0.77  1.0
  Si  Si2  1  0.0  0.0  0.23  1.0
  Si  Si3  1  0.27  0.27  0.97  1.0
  Ni  Ni1  1  0.27  0.27  0.58  1.0

data_CrSi2Ni
_symmetry_space_group_name_H-M   Cm
_cell_length_a   3.61
_cell_length_b   3.61
_cell_length_c   7.42
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   CrSi2Ni
_chemical_formula_sum   'Cr2 Si4 Ni2'
_cell_volume   96.46
_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
  Cr  Cr0  2  0.0  0.0  0.77  1.0
  Si  Si1  2  0.0  0.0  0.23  1.0
  Si  Si2  2  0.27  0.0  0.97  1.0
  Ni  Ni3  2  0.27  0.0  0.58  1.0

Cr Si Si Ni
Cr(Ni)Si2 crystallizes in the monoclinic Cm space group. Cr(1) is bonded in a distorted water-like geometry to one Ni(1) and one Si(2) atom. The Cr(1)-Ni(1) bond length is 1.72 Å. The Cr(1)-Si(2) bond length is 1.80 Å. Ni(1) is bonded in a distorted single-bond geometry to one Cr(1) and one Si(1) atom. The Ni(1)-Si(1) bond length is 2.80 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 8-coordinate geometry to one Ni(1), three equivalent Si(2), and four equivalent Si(1) atoms. There is one shorter (2.14 Å) and two longer (2.74 Å) Si(1)-Si(2) bond lengths. All Si(1)-Si(1) bond lengths are 2.55 Å. In the second Si site, Si(2) is bonded in a distorted single-bond geometry to one Cr(1) and three equivalent Si(1) atoms.