data_SrY2Si
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.85
_cell_length_b   4.85
_cell_length_c   4.71
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SrY2Si
_chemical_formula_sum   'Sr1 Y2 Si1'
_cell_volume   110.96
_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  Sr1  1  0.43  0.43  0.0  1.0
  Y  Y2  1  0.43  0.0  0.36  1.0
  Y  Y3  1  0.0  0.43  0.36  1.0
  Si  Si0  1  0.0  0.0  0.0  1.0

data_SrY2Si
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.86
_cell_length_b   6.86
_cell_length_c   4.71
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   SrY2Si
_chemical_formula_sum   'Sr2 Y4 Si2'
_cell_volume   221.91
_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
  Sr  Sr0  2  0.43  0.0  0.0  1.0
  Y  Y1  4  0.21  0.21  0.36  1.0
  Si  Si2  2  0.0  0.0  0.0  1.0

Sr Y Y Si
Sr Y Y Si 0 3 o o o 0 2 o o o 0 2 + o o 0 1 o o o 0 1 o + o 1 3 o o o 1 3 + o o 1 2 o o o 2 3 o o o 2 3 o + o 
SrY2Si crystallizes in the monoclinic Cm space group. Sr(1) is bonded in a 3-coordinate geometry to four equivalent Y(1) and three equivalent Si(1) atoms. There are two shorter (2.66 Å) and two longer (3.25 Å) Sr(1)-Y(1) bond lengths. There is one shorter (2.92 Å) and two longer (3.47 Å) Sr(1)-Si(1) bond lengths. Y(1) is bonded in a 4-coordinate geometry to two equivalent Sr(1) and three equivalent Si(1) atoms. There are a spread of Y(1)-Si(1) bond distances ranging from 2.66-3.67 Å. Si(1) is bonded in a 9-coordinate geometry to three equivalent Sr(1) and six equivalent Y(1) atoms.