The crystal structure described by SiCs crystallizes in the tetragonal I4_1/acd space group. There are two inequivalent Cs sites. In the first Cs site, Cs(1) is bonded in a 8-coordinate geometry to eight equivalent Si(1) atoms. In the second Cs site, Cs(2) is bonded in a 6-coordinate geometry to six equivalent Si(1) atoms. Si(1) is bonded in a 10-coordinate geometry to three equivalent Cs(2), four equivalent Cs(1), and three equivalent Si(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_CsSi
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.317
_cell_length_b   12.317
_cell_length_c   12.317
_cell_angle_alpha   124.761
_cell_angle_beta   124.761
_cell_angle_gamma   81.935
_symmetry_Int_Tables_number   1
_cell_volume   1213.021
_cell_formula_units_Z   16
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
  Cs  Cs0  1  0.391  0.750  0.141  1.0
  Cs  Cs1  1  0.109  0.250  0.359  1.0
  Cs  Cs2  1  0.750  0.109  0.359  1.0
  Cs  Cs3  1  0.250  0.391  0.141  1.0
  Cs  Cs4  1  0.750  0.609  0.859  1.0
  Cs  Cs5  1  0.250  0.891  0.641  1.0
  Cs  Cs6  1  0.891  0.750  0.641  1.0
  Cs  Cs7  1  0.609  0.250  0.859  1.0
  Cs  Cs8  1  0.495  0.245  0.491  1.0
  Cs  Cs9  1  0.255  0.005  0.009  1.0
  Cs  Cs10  1  0.005  0.495  0.750  1.0
  Cs  Cs11  1  0.245  0.255  0.750  1.0
  Cs  Cs12  1  0.505  0.755  0.509  1.0
  Cs  Cs13  1  0.745  0.995  0.991  1.0
  Cs  Cs14  1  0.995  0.505  0.250  1.0
  Cs  Cs15  1  0.755  0.745  0.250  1.0
  Si  Si16  1  0.581  0.477  0.217  1.0
  Si  Si17  1  0.760  0.365  0.283  1.0
  Si  Si18  1  0.919  0.135  0.896  1.0
  Si  Si19  1  0.740  0.023  0.604  1.0
  Si  Si20  1  0.023  0.919  0.283  1.0
  Si  Si21  1  0.135  0.740  0.217  1.0
  Si  Si22  1  0.365  0.581  0.604  1.0
  Si  Si23  1  0.477  0.760  0.896  1.0
  Si  Si24  1  0.419  0.523  0.783  1.0
  Si  Si25  1  0.240  0.635  0.717  1.0
  Si  Si26  1  0.081  0.865  0.104  1.0
  Si  Si27  1  0.260  0.977  0.396  1.0
  Si  Si28  1  0.977  0.081  0.717  1.0
  Si  Si29  1  0.865  0.260  0.783  1.0
  Si  Si30  1  0.635  0.419  0.396  1.0
  Si  Si31  1  0.523  0.240  0.104  1.0
[/CIF]
.
The crystal structure described by SiCs crystallizes in the tetragonal I4_1/acd space group. There are two inequivalent Cs sites. In the first Cs site, Cs(1) is bonded in a 8-coordinate geometry to eight equivalent Si(1) atoms. In the second Cs site, Cs(2) is bonded in a 6-coordinate geometry to six equivalent Si(1) atoms. Si(1) is bonded in a 10-coordinate geometry to three equivalent Cs(2), four equivalent Cs(1), and three equivalent Si(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_CsSi
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.317
_cell_length_b   12.317
_cell_length_c   12.317
_cell_angle_alpha   124.761
_cell_angle_beta   124.761
_cell_angle_gamma   81.935
_symmetry_Int_Tables_number   1
_cell_volume   1213.021
_cell_formula_units_Z   16
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
  Cs  Cs0  1  0.391  0.750  0.141  1.0
  Cs  Cs1  1  0.109  0.250  0.359  1.0
  Cs  Cs2  1  0.750  0.109  0.359  1.0
  Cs  Cs3  1  0.250  0.391  0.141  1.0
  Cs  Cs4  1  0.750  0.609  0.859  1.0
  Cs  Cs5  1  0.250  0.891  0.641  1.0
  Cs  Cs6  1  0.891  0.750  0.641  1.0
  Cs  Cs7  1  0.609  0.250  0.859  1.0
  Cs  Cs8  1  0.495  0.245  0.491  1.0
  Cs  Cs9  1  0.255  0.005  0.009  1.0
  Cs  Cs10  1  0.005  0.495  0.750  1.0
  Cs  Cs11  1  0.245  0.255  0.750  1.0
  Cs  Cs12  1  0.505  0.755  0.509  1.0
  Cs  Cs13  1  0.745  0.995  0.991  1.0
  Cs  Cs14  1  0.995  0.505  0.250  1.0
  Cs  Cs15  1  0.755  0.745  0.250  1.0
  Si  Si16  1  0.581  0.477  0.217  1.0
  Si  Si17  1  0.760  0.365  0.283  1.0
  Si  Si18  1  0.919  0.135  0.896  1.0
  Si  Si19  1  0.740  0.023  0.604  1.0
  Si  Si20  1  0.023  0.919  0.283  1.0
  Si  Si21  1  0.135  0.740  0.217  1.0
  Si  Si22  1  0.365  0.581  0.604  1.0
  Si  Si23  1  0.477  0.760  0.896  1.0
  Si  Si24  1  0.419  0.523  0.783  1.0
  Si  Si25  1  0.240  0.635  0.717  1.0
  Si  Si26  1  0.081  0.865  0.104  1.0
  Si  Si27  1  0.260  0.977  0.396  1.0
  Si  Si28  1  0.977  0.081  0.717  1.0
  Si  Si29  1  0.865  0.260  0.783  1.0
  Si  Si30  1  0.635  0.419  0.396  1.0
  Si  Si31  1  0.523  0.240  0.104  1.0
[/CIF]
.