The crystal structure described by SrEuSi4 is hexagonal omega structure-derived structured and crystallizes in the tetragonal I-4m2 space group. Sr(1) is bonded to four equivalent Si(1) and eight Si(2,2) atoms to form SrSi12 cuboctahedra that share edges with four equivalent Sr(1)Si12 cuboctahedra, edges with eight equivalent Eu(1)Si12 cuboctahedra, faces with four equivalent Sr(1)Si12 cuboctahedra, and faces with four equivalent Eu(1)Si12 cuboctahedra. Eu(1) is bonded to four Si(2,2) and eight Si(1,1) atoms to form EuSi12 cuboctahedra that share edges with four equivalent Eu(1)Si12 cuboctahedra, edges with eight equivalent Sr(1)Si12 cuboctahedra, faces with four equivalent Sr(1)Si12 cuboctahedra, and faces with four equivalent Eu(1)Si12 cuboctahedra. There are five inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to two equivalent Sr(1), four equivalent Eu(1), one Si(1), and two equivalent Si(2) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to four equivalent Sr(1), two equivalent Eu(1), one Si(2), and two equivalent Si(1) atoms. In the third Si site, Si(1) is bonded in a 9-coordinate geometry to two equivalent Sr(1), four equivalent Eu(1), one Si(1), and two equivalent Si(2) atoms. In the fourth Si site, Si(2) is bonded in a 9-coordinate geometry to four equivalent Sr(1), two equivalent Eu(1), one Si(2), and two equivalent Si(1) atoms. In the fifth Si site, Si(2) is bonded in a 9-coordinate geometry to four equivalent Sr(1), two equivalent Eu(1), one Si(2), and two equivalent Si(1) atoms. is represented by the CIF card [CIF]
data_SrEuSi4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.526
_cell_length_b   7.526
_cell_length_c   7.524
_cell_angle_alpha   146.216
_cell_angle_beta   146.216
_cell_angle_gamma   48.521
_symmetry_Int_Tables_number   1
_cell_volume   131.219
_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  Sr0  1  0.000  1.000  1.000  1.0
  Eu  Eu1  1  0.250  0.750  0.500  1.0
  Si  Si2  1  0.667  0.167  0.500  1.0
  Si  Si3  1  0.585  0.585  1.000  1.0
  Si  Si4  1  0.833  0.333  0.500  1.0
  Si  Si5  1  0.415  0.415  0.000  1.0
[/CIF]
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The crystal structure described by SrEuSi4 is hexagonal omega structure-derived structured and crystallizes in the tetragonal I-4m2 space group. Sr(1) is bonded to four equivalent Si(1) and eight Si(2,2) atoms to form SrSi12 cuboctahedra that share edges with four equivalent Sr(1)Si12 cuboctahedra, edges with eight equivalent Eu(1)Si12 cuboctahedra, faces with four equivalent Sr(1)Si12 cuboctahedra, and faces with four equivalent Eu(1)Si12 cuboctahedra. Eu(1) is bonded to four Si(2,2) and eight Si(1,1) atoms to form EuSi12 cuboctahedra that share edges with four equivalent Eu(1)Si12 cuboctahedra, edges with eight equivalent Sr(1)Si12 cuboctahedra, faces with four equivalent Sr(1)Si12 cuboctahedra, and faces with four equivalent Eu(1)Si12 cuboctahedra. There are five inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to two equivalent Sr(1), four equivalent Eu(1), one Si(1), and two equivalent Si(2) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to four equivalent Sr(1), two equivalent Eu(1), one Si(2), and two equivalent Si(1) atoms. In the third Si site, Si(1) is bonded in a 9-coordinate geometry to two equivalent Sr(1), four equivalent Eu(1), one Si(1), and two equivalent Si(2) atoms. In the fourth Si site, Si(2) is bonded in a 9-coordinate geometry to four equivalent Sr(1), two equivalent Eu(1), one Si(2), and two equivalent Si(1) atoms. In the fifth Si site, Si(2) is bonded in a 9-coordinate geometry to four equivalent Sr(1), two equivalent Eu(1), one Si(2), and two equivalent Si(1) atoms. is represented by the CIF card [CIF]
data_SrEuSi4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.526
_cell_length_b   7.526
_cell_length_c   7.524
_cell_angle_alpha   146.216
_cell_angle_beta   146.216
_cell_angle_gamma   48.521
_symmetry_Int_Tables_number   1
_cell_volume   131.219
_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  Sr0  1  0.000  1.000  1.000  1.0
  Eu  Eu1  1  0.250  0.750  0.500  1.0
  Si  Si2  1  0.667  0.167  0.500  1.0
  Si  Si3  1  0.585  0.585  1.000  1.0
  Si  Si4  1  0.833  0.333  0.500  1.0
  Si  Si5  1  0.415  0.415  0.000  1.0
[/CIF]
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