data_SrSi2Ni
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.17
_cell_length_b   3.17
_cell_length_c   6.99
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SrSi2Ni
_chemical_formula_sum   'Sr1 Si2 Ni1'
_cell_volume   70.25
_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
  Sr  Sr3  1  0.0  0.0  0.49  1.0
  Si  Si1  1  0.59  0.59  0.21  1.0
  Si  Si2  1  0.59  0.59  0.78  1.0
  Ni  Ni0  1  0.0  0.0  0.0  1.0

data_SrSi2Ni
_symmetry_space_group_name_H-M   Amm2
_cell_length_a   6.99
_cell_length_b   4.48
_cell_length_c   4.48
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   38
_chemical_formula_structural   SrSi2Ni
_chemical_formula_sum   'Sr2 Si4 Ni2'
_cell_volume   140.49
_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, y, z'
  4  'x, -y, z'
  5  'x, y+1/2, z+1/2'
  6  '-x, -y+1/2, z+1/2'
  7  '-x, y+1/2, z+1/2'
  8  'x, -y+1/2, z+1/2'
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
  Sr  Sr0  2  0.0  0.0  0.0  1.0
  Si  Si1  4  0.28  0.0  0.59  1.0
  Ni  Ni2  2  0.5  0.0  0.0  1.0

Sr Si Si Ni
SrNiSi2 crystallizes in the monoclinic Cm space group. Sr(1) is bonded in a 8-coordinate geometry to four equivalent Si(1) and four equivalent Si(2) atoms. There are a spread of Sr(1)-Si(1) bond distances ranging from 2.72-3.29 Å. There are a spread of Sr(1)-Si(2) bond distances ranging from 2.72-3.29 Å. Ni(1) is bonded in a 6-coordinate geometry to three equivalent Si(1) and three equivalent Si(2) atoms. There is one shorter (2.37 Å) and two longer (2.71 Å) Ni(1)-Si(1) bond lengths. There is one shorter (2.41 Å) and two longer (2.75 Å) Ni(1)-Si(2) bond lengths. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 7-coordinate geometry to four equivalent Sr(1) and three equivalent Ni(1) atoms. In the second Si site, Si(2) is bonded in a 7-coordinate geometry to four equivalent Sr(1) and three equivalent Ni(1) atoms.