The material described by Er3Ni19B10 crystallizes in the monoclinic C2/m space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 14-coordinate geometry to two equivalent Ni(1), two equivalent Ni(3), two equivalent Ni(4), four equivalent Ni(6), and four equivalent Ni(7) atoms. In the second Er site, Er(2) is bonded in a 20-coordinate geometry to one Ni(3), one Ni(4), two equivalent Ni(2), two equivalent Ni(6), four equivalent Ni(5), four equivalent Ni(7), two equivalent B(1), two equivalent B(2), and two equivalent B(3) atoms. There are seven inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 4-coordinate geometry to two equivalent Er(1), two equivalent Ni(3), and four equivalent B(3) atoms. In the second Ni site, Ni(2) is bonded in a 5-coordinate geometry to two equivalent Er(2), two equivalent B(1), and two equivalent B(2) atoms. In the third Ni site, Ni(3) is bonded in a 10-coordinate geometry to one Er(1), one Er(2), one Ni(1), one Ni(4), two equivalent Ni(5), two equivalent B(2), and two equivalent B(3) atoms. In the fourth Ni site, Ni(4) is bonded in a 4-coordinate geometry to one Er(1), one Er(2), one Ni(3), two equivalent B(2), and two equivalent B(3) atoms. In the fifth Ni site, Ni(5) is bonded in a 4-coordinate geometry to two equivalent Er(2), one Ni(3), two equivalent B(2), and two equivalent B(3) atoms. In the sixth Ni site, Ni(6) is bonded in a 4-coordinate geometry to one Er(1), one Er(2), one B(1), one B(3), and two equivalent B(2) atoms. In the seventh Ni site, Ni(7) is bonded in a 3-coordinate geometry to one Er(1), two equivalent Er(2), one B(1), and two equivalent B(3) atoms. There are three inequivalent B sites. In the first B site, B(1) is bonded in a 9-coordinate geometry to two equivalent Er(2), two equivalent Ni(2), two equivalent Ni(6), two equivalent Ni(7), and one B(1) atom. In the second B site, B(2) is bonded in a 9-coordinate geometry to one Er(2), one Ni(2), one Ni(3), one Ni(4), two equivalent Ni(5), two equivalent Ni(6), and one B(2) atom. In the third B site, B(3) is bonded in a 9-coordinate geometry to one Er(2), one Ni(1), one Ni(3), one Ni(4), one Ni(6), two equivalent Ni(5), and two equivalent Ni(7) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Er3Ni19B10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.856
_cell_length_b   7.856
_cell_length_c   5.752
_cell_angle_alpha   88.906
_cell_angle_beta   88.906
_cell_angle_gamma   66.967
_symmetry_Int_Tables_number   1
_cell_volume   326.658
_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
  Er  Er0  1  0.000  0.000  0.000  1.0
  Er  Er1  1  0.625  0.625  0.616  1.0
  Er  Er2  1  0.375  0.375  0.384  1.0
  Ni  Ni3  1  0.000  0.000  0.500  1.0
  Ni  Ni4  1  0.622  0.622  0.128  1.0
  Ni  Ni5  1  0.378  0.378  0.872  1.0
  Ni  Ni6  1  0.163  0.163  0.296  1.0
  Ni  Ni7  1  0.837  0.837  0.704  1.0
  Ni  Ni8  1  0.182  0.182  0.729  1.0
  Ni  Ni9  1  0.818  0.818  0.271  1.0
  Ni  Ni10  1  0.483  0.955  0.303  1.0
  Ni  Ni11  1  0.955  0.483  0.303  1.0
  Ni  Ni12  1  0.517  0.045  0.697  1.0
  Ni  Ni13  1  0.045  0.517  0.697  1.0
  Ni  Ni14  1  0.122  0.623  0.073  1.0
  Ni  Ni15  1  0.623  0.122  0.073  1.0
  Ni  Ni16  1  0.878  0.377  0.927  1.0
  Ni  Ni17  1  0.377  0.878  0.927  1.0
  Ni  Ni18  1  0.770  0.290  0.302  1.0
  Ni  Ni19  1  0.290  0.770  0.302  1.0
  Ni  Ni20  1  0.230  0.710  0.698  1.0
  Ni  Ni21  1  0.710  0.230  0.698  1.0
  B  B22  1  0.385  0.615  0.000  1.0
  B  B23  1  0.615  0.385  0.000  1.0
  B  B24  1  0.650  0.858  0.975  1.0
  B  B25  1  0.858  0.650  0.975  1.0
  B  B26  1  0.350  0.142  0.025  1.0
  B  B27  1  0.142  0.350  0.025  1.0
  B  B28  1  0.935  0.301  0.570  1.0
  B  B29  1  0.301  0.935  0.570  1.0
  B  B30  1  0.065  0.699  0.430  1.0
  B  B31  1  0.699  0.065  0.430  1.0
[/CIF]
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The material described by Er3Ni19B10 crystallizes in the monoclinic C2/m space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 14-coordinate geometry to two equivalent Ni(1), two equivalent Ni(3), two equivalent Ni(4), four equivalent Ni(6), and four equivalent Ni(7) atoms. In the second Er site, Er(2) is bonded in a 20-coordinate geometry to one Ni(3), one Ni(4), two equivalent Ni(2), two equivalent Ni(6), four equivalent Ni(5), four equivalent Ni(7), two equivalent B(1), two equivalent B(2), and two equivalent B(3) atoms. There are seven inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 4-coordinate geometry to two equivalent Er(1), two equivalent Ni(3), and four equivalent B(3) atoms. In the second Ni site, Ni(2) is bonded in a 5-coordinate geometry to two equivalent Er(2), two equivalent B(1), and two equivalent B(2) atoms. In the third Ni site, Ni(3) is bonded in a 10-coordinate geometry to one Er(1), one Er(2), one Ni(1), one Ni(4), two equivalent Ni(5), two equivalent B(2), and two equivalent B(3) atoms. In the fourth Ni site, Ni(4) is bonded in a 4-coordinate geometry to one Er(1), one Er(2), one Ni(3), two equivalent B(2), and two equivalent B(3) atoms. In the fifth Ni site, Ni(5) is bonded in a 4-coordinate geometry to two equivalent Er(2), one Ni(3), two equivalent B(2), and two equivalent B(3) atoms. In the sixth Ni site, Ni(6) is bonded in a 4-coordinate geometry to one Er(1), one Er(2), one B(1), one B(3), and two equivalent B(2) atoms. In the seventh Ni site, Ni(7) is bonded in a 3-coordinate geometry to one Er(1), two equivalent Er(2), one B(1), and two equivalent B(3) atoms. There are three inequivalent B sites. In the first B site, B(1) is bonded in a 9-coordinate geometry to two equivalent Er(2), two equivalent Ni(2), two equivalent Ni(6), two equivalent Ni(7), and one B(1) atom. In the second B site, B(2) is bonded in a 9-coordinate geometry to one Er(2), one Ni(2), one Ni(3), one Ni(4), two equivalent Ni(5), two equivalent Ni(6), and one B(2) atom. In the third B site, B(3) is bonded in a 9-coordinate geometry to one Er(2), one Ni(1), one Ni(3), one Ni(4), one Ni(6), two equivalent Ni(5), and two equivalent Ni(7) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Er3Ni19B10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.856
_cell_length_b   7.856
_cell_length_c   5.752
_cell_angle_alpha   88.906
_cell_angle_beta   88.906
_cell_angle_gamma   66.967
_symmetry_Int_Tables_number   1
_cell_volume   326.658
_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
  Er  Er0  1  0.000  0.000  0.000  1.0
  Er  Er1  1  0.625  0.625  0.616  1.0
  Er  Er2  1  0.375  0.375  0.384  1.0
  Ni  Ni3  1  0.000  0.000  0.500  1.0
  Ni  Ni4  1  0.622  0.622  0.128  1.0
  Ni  Ni5  1  0.378  0.378  0.872  1.0
  Ni  Ni6  1  0.163  0.163  0.296  1.0
  Ni  Ni7  1  0.837  0.837  0.704  1.0
  Ni  Ni8  1  0.182  0.182  0.729  1.0
  Ni  Ni9  1  0.818  0.818  0.271  1.0
  Ni  Ni10  1  0.483  0.955  0.303  1.0
  Ni  Ni11  1  0.955  0.483  0.303  1.0
  Ni  Ni12  1  0.517  0.045  0.697  1.0
  Ni  Ni13  1  0.045  0.517  0.697  1.0
  Ni  Ni14  1  0.122  0.623  0.073  1.0
  Ni  Ni15  1  0.623  0.122  0.073  1.0
  Ni  Ni16  1  0.878  0.377  0.927  1.0
  Ni  Ni17  1  0.377  0.878  0.927  1.0
  Ni  Ni18  1  0.770  0.290  0.302  1.0
  Ni  Ni19  1  0.290  0.770  0.302  1.0
  Ni  Ni20  1  0.230  0.710  0.698  1.0
  Ni  Ni21  1  0.710  0.230  0.698  1.0
  B  B22  1  0.385  0.615  0.000  1.0
  B  B23  1  0.615  0.385  0.000  1.0
  B  B24  1  0.650  0.858  0.975  1.0
  B  B25  1  0.858  0.650  0.975  1.0
  B  B26  1  0.350  0.142  0.025  1.0
  B  B27  1  0.142  0.350  0.025  1.0
  B  B28  1  0.935  0.301  0.570  1.0
  B  B29  1  0.301  0.935  0.570  1.0
  B  B30  1  0.065  0.699  0.430  1.0
  B  B31  1  0.699  0.065  0.430  1.0
[/CIF]
.