The material structure described by Yb4Ni6Al23 crystallizes in the monoclinic C2/m space group. There are two inequivalent Yb sites. In the first Yb site, Yb(1) is bonded in a 15-coordinate geometry to two equivalent Ni(3), one Al(11), one Al(4), one Al(5), one Al(8), one Al(9), two equivalent Al(10), two equivalent Al(2), two equivalent Al(3), and two equivalent Al(7) atoms. In the second Yb site, Yb(2) is bonded in a 15-coordinate geometry to two equivalent Ni(2), one Al(10), one Al(9), two equivalent Al(1), two equivalent Al(11), two equivalent Al(3), two equivalent Al(5), and three equivalent Al(6) atoms. There are three inequivalent Ni sites. In the first Ni site, Ni(2) is bonded in a 7-coordinate geometry to two equivalent Yb(2), one Al(11), one Al(5), two equivalent Al(10), and three equivalent Al(6) atoms. In the second Ni site, Ni(1) is bonded in a 7-coordinate geometry to one Al(2), one Al(4), one Al(5), two equivalent Al(12), two equivalent Al(7), and two equivalent Al(9) atoms. In the third Ni site, Ni(3) is bonded in a 10-coordinate geometry to two equivalent Yb(1), one Al(12), one Al(2), one Al(7), two equivalent Al(4), and three equivalent Al(8) atoms. There are twelve inequivalent Al sites. In the first Al site, Al(1) is bonded in a 8-coordinate geometry to four equivalent Yb(2), two equivalent Al(3), and four equivalent Al(11) atoms. In the second Al site, Al(2) is bonded in a 2-coordinate geometry to two equivalent Yb(1), one Ni(1), one Ni(3), one Al(3), two equivalent Al(8), and two equivalent Al(9) atoms. In the third Al site, Al(3) is bonded in a 12-coordinate geometry to two equivalent Yb(1), two equivalent Yb(2), one Al(1), one Al(10), one Al(2), one Al(5), two equivalent Al(11), and two equivalent Al(9) atoms. In the fourth Al site, Al(4) is bonded in a distorted trigonal non-coplanar geometry to one Yb(1), one Ni(1), two equivalent Ni(3), one Al(8), and two equivalent Al(7) atoms. In the fifth Al site, Al(5) is bonded in a distorted bent 150 degrees geometry to one Yb(1), two equivalent Yb(2), one Ni(1), one Ni(2), one Al(3), two equivalent Al(7), and two equivalent Al(9) atoms. In the sixth Al site, Al(6) is bonded in a 3-coordinate geometry to three equivalent Yb(2) and three equivalent Ni(2) atoms. In the seventh Al site, Al(7) is bonded in a 12-coordinate geometry to two equivalent Yb(1), one Ni(3), two equivalent Ni(1), one Al(10), one Al(12), one Al(9), two equivalent Al(4), and two equivalent Al(5) atoms. In the eighth Al site, Al(8) is bonded in a 10-coordinate geometry to one Yb(1), three equivalent Ni(3), one Al(12), one Al(4), two equivalent Al(2), and two equivalent Al(8) atoms. In the ninth Al site, Al(9) is bonded to one Yb(1), one Yb(2), two equivalent Ni(1), one Al(12), one Al(7), two equivalent Al(2), two equivalent Al(3), and two equivalent Al(5) atoms to form distorted face-sharing AlYb2Al8Ni2 cuboctahedra. In the tenth Al site, Al(10) is bonded in a 2-coordinate geometry to one Yb(2), two equivalent Yb(1), two equivalent Ni(2), one Al(3), and one Al(7) atom. In the eleventh Al site, Al(11) is bonded in a distorted single-bond geometry to one Yb(1), two equivalent Yb(2), one Ni(2), two equivalent Al(1), and two equivalent Al(3) atoms. In the twelfth Al site, Al(12) is bonded in a distorted trigonal planar geometry to one Ni(3), two equivalent Ni(1), one Al(7), one Al(8), and one Al(9) atom. is represented by the CIF card [CIF]
data_Yb4Al23Ni6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.190
_cell_length_b   8.190
_cell_length_c   18.054
_cell_angle_alpha   68.119
_cell_angle_beta   68.119
_cell_angle_gamma   28.678
_symmetry_Int_Tables_number   1
_cell_volume   536.406
_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
  Yb  Yb0  1  0.739  0.739  0.215  1.0
  Yb  Yb1  1  0.579  0.579  0.593  1.0
  Yb  Yb2  1  0.421  0.421  0.407  1.0
  Yb  Yb3  1  0.261  0.261  0.785  1.0
  Al  Al4  1  0.000  0.000  0.500  1.0
  Al  Al5  1  0.855  0.855  0.858  1.0
  Al  Al6  1  0.920  0.920  0.688  1.0
  Al  Al7  1  0.080  0.080  0.312  1.0
  Al  Al8  1  0.910  0.910  0.048  1.0
  Al  Al9  1  0.090  0.090  0.952  1.0
  Al  Al10  1  0.908  0.908  0.277  1.0
  Al  Al11  1  0.092  0.092  0.723  1.0
  Al  Al12  1  0.797  0.797  0.522  1.0
  Al  Al13  1  0.203  0.203  0.478  1.0
  Al  Al14  1  0.145  0.145  0.142  1.0
  Al  Al15  1  0.608  0.608  0.839  1.0
  Al  Al16  1  0.746  0.746  0.046  1.0
  Al  Al17  1  0.254  0.254  0.954  1.0
  Al  Al18  1  0.392  0.392  0.161  1.0
  Al  Al19  1  0.467  0.467  0.781  1.0
  Al  Al20  1  0.727  0.727  0.677  1.0
  Al  Al21  1  0.273  0.273  0.323  1.0
  Al  Al22  1  0.622  0.622  0.404  1.0
  Al  Al23  1  0.378  0.378  0.596  1.0
  Al  Al24  1  0.571  0.571  0.061  1.0
  Al  Al25  1  0.429  0.429  0.939  1.0
  Al  Al26  1  0.533  0.533  0.219  1.0
  Ni  Ni27  1  0.994  0.994  0.132  1.0
  Ni  Ni28  1  0.006  0.006  0.868  1.0
  Ni  Ni29  1  0.773  0.773  0.397  1.0
  Ni  Ni30  1  0.690  0.690  0.933  1.0
  Ni  Ni31  1  0.227  0.227  0.603  1.0
  Ni  Ni32  1  0.310  0.310  0.067  1.0
[/CIF]
.
The material structure described by Yb4Ni6Al23 crystallizes in the monoclinic C2/m space group. There are two inequivalent Yb sites. In the first Yb site, Yb(1) is bonded in a 15-coordinate geometry to two equivalent Ni(3), one Al(11), one Al(4), one Al(5), one Al(8), one Al(9), two equivalent Al(10), two equivalent Al(2), two equivalent Al(3), and two equivalent Al(7) atoms. In the second Yb site, Yb(2) is bonded in a 15-coordinate geometry to two equivalent Ni(2), one Al(10), one Al(9), two equivalent Al(1), two equivalent Al(11), two equivalent Al(3), two equivalent Al(5), and three equivalent Al(6) atoms. There are three inequivalent Ni sites. In the first Ni site, Ni(2) is bonded in a 7-coordinate geometry to two equivalent Yb(2), one Al(11), one Al(5), two equivalent Al(10), and three equivalent Al(6) atoms. In the second Ni site, Ni(1) is bonded in a 7-coordinate geometry to one Al(2), one Al(4), one Al(5), two equivalent Al(12), two equivalent Al(7), and two equivalent Al(9) atoms. In the third Ni site, Ni(3) is bonded in a 10-coordinate geometry to two equivalent Yb(1), one Al(12), one Al(2), one Al(7), two equivalent Al(4), and three equivalent Al(8) atoms. There are twelve inequivalent Al sites. In the first Al site, Al(1) is bonded in a 8-coordinate geometry to four equivalent Yb(2), two equivalent Al(3), and four equivalent Al(11) atoms. In the second Al site, Al(2) is bonded in a 2-coordinate geometry to two equivalent Yb(1), one Ni(1), one Ni(3), one Al(3), two equivalent Al(8), and two equivalent Al(9) atoms. In the third Al site, Al(3) is bonded in a 12-coordinate geometry to two equivalent Yb(1), two equivalent Yb(2), one Al(1), one Al(10), one Al(2), one Al(5), two equivalent Al(11), and two equivalent Al(9) atoms. In the fourth Al site, Al(4) is bonded in a distorted trigonal non-coplanar geometry to one Yb(1), one Ni(1), two equivalent Ni(3), one Al(8), and two equivalent Al(7) atoms. In the fifth Al site, Al(5) is bonded in a distorted bent 150 degrees geometry to one Yb(1), two equivalent Yb(2), one Ni(1), one Ni(2), one Al(3), two equivalent Al(7), and two equivalent Al(9) atoms. In the sixth Al site, Al(6) is bonded in a 3-coordinate geometry to three equivalent Yb(2) and three equivalent Ni(2) atoms. In the seventh Al site, Al(7) is bonded in a 12-coordinate geometry to two equivalent Yb(1), one Ni(3), two equivalent Ni(1), one Al(10), one Al(12), one Al(9), two equivalent Al(4), and two equivalent Al(5) atoms. In the eighth Al site, Al(8) is bonded in a 10-coordinate geometry to one Yb(1), three equivalent Ni(3), one Al(12), one Al(4), two equivalent Al(2), and two equivalent Al(8) atoms. In the ninth Al site, Al(9) is bonded to one Yb(1), one Yb(2), two equivalent Ni(1), one Al(12), one Al(7), two equivalent Al(2), two equivalent Al(3), and two equivalent Al(5) atoms to form distorted face-sharing AlYb2Al8Ni2 cuboctahedra. In the tenth Al site, Al(10) is bonded in a 2-coordinate geometry to one Yb(2), two equivalent Yb(1), two equivalent Ni(2), one Al(3), and one Al(7) atom. In the eleventh Al site, Al(11) is bonded in a distorted single-bond geometry to one Yb(1), two equivalent Yb(2), one Ni(2), two equivalent Al(1), and two equivalent Al(3) atoms. In the twelfth Al site, Al(12) is bonded in a distorted trigonal planar geometry to one Ni(3), two equivalent Ni(1), one Al(7), one Al(8), and one Al(9) atom. is represented by the CIF card [CIF]
data_Yb4Al23Ni6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.190
_cell_length_b   8.190
_cell_length_c   18.054
_cell_angle_alpha   68.119
_cell_angle_beta   68.119
_cell_angle_gamma   28.678
_symmetry_Int_Tables_number   1
_cell_volume   536.406
_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
  Yb  Yb0  1  0.739  0.739  0.215  1.0
  Yb  Yb1  1  0.579  0.579  0.593  1.0
  Yb  Yb2  1  0.421  0.421  0.407  1.0
  Yb  Yb3  1  0.261  0.261  0.785  1.0
  Al  Al4  1  0.000  0.000  0.500  1.0
  Al  Al5  1  0.855  0.855  0.858  1.0
  Al  Al6  1  0.920  0.920  0.688  1.0
  Al  Al7  1  0.080  0.080  0.312  1.0
  Al  Al8  1  0.910  0.910  0.048  1.0
  Al  Al9  1  0.090  0.090  0.952  1.0
  Al  Al10  1  0.908  0.908  0.277  1.0
  Al  Al11  1  0.092  0.092  0.723  1.0
  Al  Al12  1  0.797  0.797  0.522  1.0
  Al  Al13  1  0.203  0.203  0.478  1.0
  Al  Al14  1  0.145  0.145  0.142  1.0
  Al  Al15  1  0.608  0.608  0.839  1.0
  Al  Al16  1  0.746  0.746  0.046  1.0
  Al  Al17  1  0.254  0.254  0.954  1.0
  Al  Al18  1  0.392  0.392  0.161  1.0
  Al  Al19  1  0.467  0.467  0.781  1.0
  Al  Al20  1  0.727  0.727  0.677  1.0
  Al  Al21  1  0.273  0.273  0.323  1.0
  Al  Al22  1  0.622  0.622  0.404  1.0
  Al  Al23  1  0.378  0.378  0.596  1.0
  Al  Al24  1  0.571  0.571  0.061  1.0
  Al  Al25  1  0.429  0.429  0.939  1.0
  Al  Al26  1  0.533  0.533  0.219  1.0
  Ni  Ni27  1  0.994  0.994  0.132  1.0
  Ni  Ni28  1  0.006  0.006  0.868  1.0
  Ni  Ni29  1  0.773  0.773  0.397  1.0
  Ni  Ni30  1  0.690  0.690  0.933  1.0
  Ni  Ni31  1  0.227  0.227  0.603  1.0
  Ni  Ni32  1  0.310  0.310  0.067  1.0
[/CIF]
.