data_Eu(NiSb)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.22
_cell_length_b   6.22
_cell_length_c   6.22
_cell_angle_alpha   138.63
_cell_angle_beta   138.63
_cell_angle_gamma   59.93
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Eu(NiSb)2
_chemical_formula_sum   'Eu1 Ni2 Sb2'
_cell_volume   104.1
_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  0.0  0.0  0.0  1.0
  Ni  Ni1  1  0.2  0.0  0.69  1.0
  Ni  Ni2  1  0.0  0.2  0.69  1.0
  Sb  Sb3  1  0.0  0.0  0.91  1.0
  Sb  Sb4  1  0.0  0.0  0.87  1.0

data_Eu(NiSb)2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.22
_cell_length_b   6.22
_cell_length_c   6.22
_cell_angle_alpha   90.0
_cell_angle_beta   119.97
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Eu(NiSb)2
_chemical_formula_sum   'Eu2 Ni4 Sb4'
_cell_volume   208.19
_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
  Eu  Eu0  2  0.0  0.0  0.0  1.0
  Ni  Ni1  4  0.1  0.4  0.5  1.0
  Sb  Sb2  2  0.37  0.5  0.87  1.0
  Sb  Sb3  2  0.41  0.5  0.91  1.0

Eu Ni Ni Sb Sb
Eu(NiSb)2 crystallizes in the monoclinic Cm space group. Eu(1) is bonded in a single-bond geometry to four equivalent Ni(1) and one Sb(1) atom. There are two shorter (3.50 Å) and two longer (3.78 Å) Eu(1)-Ni(1) bond lengths. The Eu(1)-Sb(1) bond length is 0.54 Å. Ni(1) is bonded in a 4-coordinate geometry to two equivalent Eu(1), one Ni(1), and one Sb(2) atom. The Ni(1)-Ni(1) bond length is 1.23 Å. The Ni(1)-Sb(2) bond length is 2.15 Å. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a distorted linear geometry to one Eu(1) and one Sb(2) atom. The Sb(1)-Sb(2) bond length is 0.28 Å. In the second Sb site, Sb(2) is bonded in a distorted single-bond geometry to two equivalent Ni(1) and one Sb(1) atom.