The material structure described by Er10NiSb5 crystallizes in the orthorhombic Pmc2_1 space group. There are eight inequivalent Er sites. In the first Er site, Er(1) is bonded in a 5-coordinate geometry to one Ni(1), one Sb(1), one Sb(3), and two equivalent Sb(2) atoms. In the second Er site, Er(2) is bonded in a 5-coordinate geometry to one Ni(1), one Sb(2), one Sb(3), and two equivalent Sb(1) atoms. In the third Er site, Er(3) is bonded in a 6-coordinate geometry to two equivalent Sb(1), two equivalent Sb(2), and two equivalent Sb(3) atoms. In the fourth Er site, Er(4) is bonded in a 5-coordinate geometry to one Ni(1), two equivalent Sb(1), and two equivalent Sb(2) atoms. In the fifth Er site, Er(5) is bonded to one Sb(3), two equivalent Sb(1), and two equivalent Sb(2) atoms to form distorted ErSb5 square pyramids that share  a cornercorner with one Er(7)Sb5 trigonal bipyramid, edges with two equivalent Er(6)NiSb4 square pyramids, and edges with two equivalent Er(7)Sb5 trigonal bipyramids. In the sixth Er site, Er(6) is bonded to one Ni(1), two equivalent Sb(1), and two equivalent Sb(2) atoms to form a mixture of distorted edge and corner-sharing ErNiSb4 square pyramids. In the seventh Er site, Er(7) is bonded to one Sb(3), two equivalent Sb(1), and two equivalent Sb(2) atoms to form distorted ErSb5 trigonal bipyramids that share  a cornercorner with one Er(5)Sb5 square pyramid, corners with four equivalent Er(6)NiSb4 square pyramids, and edges with two equivalent Er(5)Sb5 square pyramids. In the eighth Er site, Er(8) is bonded in a 5-coordinate geometry to one Ni(1), two equivalent Sb(1), and two equivalent Sb(2) atoms. Ni(1) is bonded in a distorted pentagonal bipyramidal geometry to one Er(4), one Er(6), one Er(8), two equivalent Er(1), and two equivalent Er(2) atoms. There are three inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 9-coordinate geometry to one Er(1), one Er(3), one Er(4), one Er(5), one Er(6), one Er(7), one Er(8), and two equivalent Er(2) atoms. In the second Sb site, Sb(2) is bonded in a 9-coordinate geometry to one Er(2), one Er(3), one Er(4), one Er(5), one Er(6), one Er(7), one Er(8), and two equivalent Er(1) atoms. In the third Sb site, Sb(3) is bonded in a 8-coordinate geometry to one Er(5), one Er(7), two equivalent Er(1), two equivalent Er(2), and two equivalent Er(3) atoms. is represented by the CIF card [CIF]
data_Er10NiSb5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.890
_cell_length_b   9.070
_cell_length_c   11.812
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   845.293
_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
  Er  Er0  1  0.435  0.183  0.566  1.0
  Er  Er1  1  0.565  0.817  0.066  1.0
  Er  Er2  1  0.069  0.722  0.433  1.0
  Er  Er3  1  0.931  0.278  0.933  1.0
  Er  Er4  1  0.069  0.278  0.433  1.0
  Er  Er5  1  0.931  0.722  0.933  1.0
  Er  Er6  1  0.435  0.817  0.566  1.0
  Er  Er7  1  0.565  0.183  0.066  1.0
  Er  Er8  1  0.577  0.500  0.774  1.0
  Er  Er9  1  0.423  0.500  0.275  1.0
  Er  Er10  1  0.908  1.000  0.204  1.0
  Er  Er11  1  0.092  0.000  0.704  1.0
  Er  Er12  1  0.268  0.500  0.995  1.0
  Er  Er13  1  0.732  0.500  0.495  1.0
  Er  Er14  1  0.201  1.000  0.999  1.0
  Er  Er15  1  0.799  1.000  0.499  1.0
  Er  Er16  1  0.094  0.500  0.714  1.0
  Er  Er17  1  0.906  0.500  0.214  1.0
  Er  Er18  1  0.377  0.000  0.305  1.0
  Er  Er19  1  0.623  1.000  0.805  1.0
  Ni  Ni20  1  0.174  0.000  0.488  1.0
  Ni  Ni21  1  0.826  1.000  0.988  1.0
  Sb  Sb22  1  0.815  0.741  0.672  1.0
  Sb  Sb23  1  0.185  0.259  0.172  1.0
  Sb  Sb24  1  0.683  0.242  0.326  1.0
  Sb  Sb25  1  0.317  0.758  0.826  1.0
  Sb  Sb26  1  0.683  0.758  0.326  1.0
  Sb  Sb27  1  0.317  0.242  0.826  1.0
  Sb  Sb28  1  0.815  0.259  0.672  1.0
  Sb  Sb29  1  0.185  0.741  0.172  1.0
  Sb  Sb30  1  0.343  0.500  0.525  1.0
  Sb  Sb31  1  0.657  0.500  0.025  1.0
[/CIF]
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The material structure described by Er10NiSb5 crystallizes in the orthorhombic Pmc2_1 space group. There are eight inequivalent Er sites. In the first Er site, Er(1) is bonded in a 5-coordinate geometry to one Ni(1), one Sb(1), one Sb(3), and two equivalent Sb(2) atoms. In the second Er site, Er(2) is bonded in a 5-coordinate geometry to one Ni(1), one Sb(2), one Sb(3), and two equivalent Sb(1) atoms. In the third Er site, Er(3) is bonded in a 6-coordinate geometry to two equivalent Sb(1), two equivalent Sb(2), and two equivalent Sb(3) atoms. In the fourth Er site, Er(4) is bonded in a 5-coordinate geometry to one Ni(1), two equivalent Sb(1), and two equivalent Sb(2) atoms. In the fifth Er site, Er(5) is bonded to one Sb(3), two equivalent Sb(1), and two equivalent Sb(2) atoms to form distorted ErSb5 square pyramids that share  a cornercorner with one Er(7)Sb5 trigonal bipyramid, edges with two equivalent Er(6)NiSb4 square pyramids, and edges with two equivalent Er(7)Sb5 trigonal bipyramids. In the sixth Er site, Er(6) is bonded to one Ni(1), two equivalent Sb(1), and two equivalent Sb(2) atoms to form a mixture of distorted edge and corner-sharing ErNiSb4 square pyramids. In the seventh Er site, Er(7) is bonded to one Sb(3), two equivalent Sb(1), and two equivalent Sb(2) atoms to form distorted ErSb5 trigonal bipyramids that share  a cornercorner with one Er(5)Sb5 square pyramid, corners with four equivalent Er(6)NiSb4 square pyramids, and edges with two equivalent Er(5)Sb5 square pyramids. In the eighth Er site, Er(8) is bonded in a 5-coordinate geometry to one Ni(1), two equivalent Sb(1), and two equivalent Sb(2) atoms. Ni(1) is bonded in a distorted pentagonal bipyramidal geometry to one Er(4), one Er(6), one Er(8), two equivalent Er(1), and two equivalent Er(2) atoms. There are three inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 9-coordinate geometry to one Er(1), one Er(3), one Er(4), one Er(5), one Er(6), one Er(7), one Er(8), and two equivalent Er(2) atoms. In the second Sb site, Sb(2) is bonded in a 9-coordinate geometry to one Er(2), one Er(3), one Er(4), one Er(5), one Er(6), one Er(7), one Er(8), and two equivalent Er(1) atoms. In the third Sb site, Sb(3) is bonded in a 8-coordinate geometry to one Er(5), one Er(7), two equivalent Er(1), two equivalent Er(2), and two equivalent Er(3) atoms. is represented by the CIF card [CIF]
data_Er10NiSb5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.890
_cell_length_b   9.070
_cell_length_c   11.812
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   845.293
_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
  Er  Er0  1  0.435  0.183  0.566  1.0
  Er  Er1  1  0.565  0.817  0.066  1.0
  Er  Er2  1  0.069  0.722  0.433  1.0
  Er  Er3  1  0.931  0.278  0.933  1.0
  Er  Er4  1  0.069  0.278  0.433  1.0
  Er  Er5  1  0.931  0.722  0.933  1.0
  Er  Er6  1  0.435  0.817  0.566  1.0
  Er  Er7  1  0.565  0.183  0.066  1.0
  Er  Er8  1  0.577  0.500  0.774  1.0
  Er  Er9  1  0.423  0.500  0.275  1.0
  Er  Er10  1  0.908  1.000  0.204  1.0
  Er  Er11  1  0.092  0.000  0.704  1.0
  Er  Er12  1  0.268  0.500  0.995  1.0
  Er  Er13  1  0.732  0.500  0.495  1.0
  Er  Er14  1  0.201  1.000  0.999  1.0
  Er  Er15  1  0.799  1.000  0.499  1.0
  Er  Er16  1  0.094  0.500  0.714  1.0
  Er  Er17  1  0.906  0.500  0.214  1.0
  Er  Er18  1  0.377  0.000  0.305  1.0
  Er  Er19  1  0.623  1.000  0.805  1.0
  Ni  Ni20  1  0.174  0.000  0.488  1.0
  Ni  Ni21  1  0.826  1.000  0.988  1.0
  Sb  Sb22  1  0.815  0.741  0.672  1.0
  Sb  Sb23  1  0.185  0.259  0.172  1.0
  Sb  Sb24  1  0.683  0.242  0.326  1.0
  Sb  Sb25  1  0.317  0.758  0.826  1.0
  Sb  Sb26  1  0.683  0.758  0.326  1.0
  Sb  Sb27  1  0.317  0.242  0.826  1.0
  Sb  Sb28  1  0.815  0.259  0.672  1.0
  Sb  Sb29  1  0.185  0.741  0.172  1.0
  Sb  Sb30  1  0.343  0.500  0.525  1.0
  Sb  Sb31  1  0.657  0.500  0.025  1.0
[/CIF]
.