The material described by EuNiSi3 crystallizes in the tetragonal I-4m2 space group. Eu(1) is bonded in a 16-coordinate geometry to four equivalent Ni(1), four equivalent Si(2), and eight equivalent Si(1) atoms. Ni(1) is bonded in a 12-coordinate geometry to four equivalent Eu(1), four equivalent Si(1), and four equivalent Si(2) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to four equivalent Eu(1), two equivalent Ni(1), one Si(1), and two equivalent Si(2) atoms. In the second Si site, Si(2) is bonded to four equivalent Eu(1), four equivalent Ni(1), and four equivalent Si(1) atoms to form a mixture of distorted corner and face-sharing SiEu4Si4Ni4 cuboctahedra. is represented by the CIF file [CIF]
data_EuSi3Ni
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.719
_cell_length_b   5.719
_cell_length_c   5.719
_cell_angle_alpha   137.719
_cell_angle_beta   137.719
_cell_angle_gamma   61.333
_symmetry_Int_Tables_number   1
_cell_volume   83.718
_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
  Eu  Eu0  1  0.000  0.000  0.000  1.0
  Si  Si1  1  0.624  0.624  0.000  1.0
  Si  Si2  1  0.376  0.376  0.000  1.0
  Si  Si3  1  0.750  0.250  0.500  1.0
  Ni  Ni4  1  0.250  0.750  0.500  1.0
[/CIF]
.
The material described by EuNiSi3 crystallizes in the tetragonal I-4m2 space group. Eu(1) is bonded in a 16-coordinate geometry to four equivalent Ni(1), four equivalent Si(2), and eight equivalent Si(1) atoms. Ni(1) is bonded in a 12-coordinate geometry to four equivalent Eu(1), four equivalent Si(1), and four equivalent Si(2) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to four equivalent Eu(1), two equivalent Ni(1), one Si(1), and two equivalent Si(2) atoms. In the second Si site, Si(2) is bonded to four equivalent Eu(1), four equivalent Ni(1), and four equivalent Si(1) atoms to form a mixture of distorted corner and face-sharing SiEu4Si4Ni4 cuboctahedra. is represented by the CIF file [CIF]
data_EuSi3Ni
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.719
_cell_length_b   5.719
_cell_length_c   5.719
_cell_angle_alpha   137.719
_cell_angle_beta   137.719
_cell_angle_gamma   61.333
_symmetry_Int_Tables_number   1
_cell_volume   83.718
_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
  Eu  Eu0  1  0.000  0.000  0.000  1.0
  Si  Si1  1  0.624  0.624  0.000  1.0
  Si  Si2  1  0.376  0.376  0.000  1.0
  Si  Si3  1  0.750  0.250  0.500  1.0
  Ni  Ni4  1  0.250  0.750  0.500  1.0
[/CIF]
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