The crystal structure described by Eu5Si3 crystallizes in the tetragonal I4/mcm space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to two equivalent Si(2) and three equivalent Si(1) atoms to form a mixture of distorted face, corner, and edge-sharing EuSi5 trigonal bipyramids. In the second Eu site, Eu(2) is bonded in a distorted square co-planar geometry to four equivalent Si(1) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to two equivalent Eu(2), six equivalent Eu(1), and one Si(1) atom. In the second Si site, Si(2) is bonded in a 8-coordinate geometry to eight equivalent Eu(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Eu5Si3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.826
_cell_length_b   7.826
_cell_length_c   9.279
_cell_angle_alpha   114.930
_cell_angle_beta   114.931
_cell_angle_gamma   89.997
_symmetry_Int_Tables_number   1
_cell_volume   456.240
_cell_formula_units_Z   2
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
  Eu  Eu0  1  0.032  0.532  0.708  1.0
  Eu  Eu1  1  0.677  0.177  0.708  1.0
  Eu  Eu2  1  0.177  0.032  0.708  1.0
  Eu  Eu3  1  0.532  0.677  0.708  1.0
  Eu  Eu4  1  0.968  0.468  0.292  1.0
  Eu  Eu5  1  0.323  0.823  0.292  1.0
  Eu  Eu6  1  0.823  0.968  0.292  1.0
  Eu  Eu7  1  0.468  0.323  0.292  1.0
  Eu  Eu8  1  0.500  0.500  0.000  1.0
  Eu  Eu9  1  0.000  0.000  0.000  1.0
  Si  Si10  1  0.391  0.891  1.000  1.0
  Si  Si11  1  0.609  0.109  0.000  1.0
  Si  Si12  1  0.109  0.391  0.000  1.0
  Si  Si13  1  0.891  0.609  1.000  1.0
  Si  Si14  1  0.250  0.250  0.500  1.0
  Si  Si15  1  0.750  0.750  0.500  1.0
[/CIF]
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The crystal structure described by Eu5Si3 crystallizes in the tetragonal I4/mcm space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to two equivalent Si(2) and three equivalent Si(1) atoms to form a mixture of distorted face, corner, and edge-sharing EuSi5 trigonal bipyramids. In the second Eu site, Eu(2) is bonded in a distorted square co-planar geometry to four equivalent Si(1) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to two equivalent Eu(2), six equivalent Eu(1), and one Si(1) atom. In the second Si site, Si(2) is bonded in a 8-coordinate geometry to eight equivalent Eu(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Eu5Si3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.826
_cell_length_b   7.826
_cell_length_c   9.279
_cell_angle_alpha   114.930
_cell_angle_beta   114.931
_cell_angle_gamma   89.997
_symmetry_Int_Tables_number   1
_cell_volume   456.240
_cell_formula_units_Z   2
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
  Eu  Eu0  1  0.032  0.532  0.708  1.0
  Eu  Eu1  1  0.677  0.177  0.708  1.0
  Eu  Eu2  1  0.177  0.032  0.708  1.0
  Eu  Eu3  1  0.532  0.677  0.708  1.0
  Eu  Eu4  1  0.968  0.468  0.292  1.0
  Eu  Eu5  1  0.323  0.823  0.292  1.0
  Eu  Eu6  1  0.823  0.968  0.292  1.0
  Eu  Eu7  1  0.468  0.323  0.292  1.0
  Eu  Eu8  1  0.500  0.500  0.000  1.0
  Eu  Eu9  1  0.000  0.000  0.000  1.0
  Si  Si10  1  0.391  0.891  1.000  1.0
  Si  Si11  1  0.609  0.109  0.000  1.0
  Si  Si12  1  0.109  0.391  0.000  1.0
  Si  Si13  1  0.891  0.609  1.000  1.0
  Si  Si14  1  0.250  0.250  0.500  1.0
  Si  Si15  1  0.750  0.750  0.500  1.0
[/CIF]
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