The compound described by Ce4Ni6Al23 crystallizes in the monoclinic C2/m space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 15-coordinate geometry to two equivalent Ni(3), one Al(12), one Al(4), one Al(5), one Al(7), one Al(8), two equivalent Al(1), two equivalent Al(10), two equivalent Al(3), and two equivalent Al(9) atoms. In the second Ce site, Ce(2) is bonded in a 15-coordinate geometry to two equivalent Ni(2), one Al(10), one Al(4), two equivalent Al(11), two equivalent Al(3), two equivalent Al(7), two equivalent Al(8), 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 Ce(2), one Al(7), one Al(8), 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(1), one Al(12), one Al(7), two equivalent Al(2), two equivalent Al(4), and two equivalent Al(9) atoms. In the third Ni site, Ni(3) is bonded in a 8-coordinate geometry to two equivalent Ce(1), one Al(1), one Al(2), one Al(9), two equivalent Al(12), and three equivalent Al(5) atoms. There are twelve inequivalent Al sites. In the first Al site, Al(1) is bonded in a distorted bent 150 degrees geometry to two equivalent Ce(1), one Ni(1), one Ni(3), one Al(3), two equivalent Al(4), and two equivalent Al(5) atoms. In the second Al site, Al(2) is bonded in a distorted trigonal planar geometry to one Ni(3), two equivalent Ni(1), one Al(4), and one Al(5) atom. In the third Al site, Al(3) is bonded in a 12-coordinate geometry to two equivalent Ce(1), two equivalent Ce(2), one Al(1), one Al(10), one Al(11), one Al(7), two equivalent Al(4), and two equivalent Al(8) atoms. In the fourth Al site, Al(4) is bonded to one Ce(1), one Ce(2), two equivalent Ni(1), one Al(2), one Al(9), two equivalent Al(1), two equivalent Al(3), and two equivalent Al(7) atoms to form distorted face-sharing AlCe2Al8Ni2 cuboctahedra. In the fifth Al site, Al(5) is bonded in a 10-coordinate geometry to one Ce(1), three equivalent Ni(3), one Al(12), one Al(2), two equivalent Al(1), and two equivalent Al(5) atoms. In the sixth Al site, Al(6) is bonded in a 3-coordinate geometry to three equivalent Ce(2) and three equivalent Ni(2) atoms. In the seventh Al site, Al(7) is bonded in a distorted bent 150 degrees geometry to one Ce(1), two equivalent Ce(2), one Ni(1), one Ni(2), one Al(3), and two equivalent Al(4) atoms. In the eighth Al site, Al(8) is bonded in a distorted single-bond geometry to one Ce(1), two equivalent Ce(2), one Ni(2), two equivalent Al(11), and two equivalent Al(3) atoms. In the ninth Al site, Al(9) is bonded in a 3-coordinate geometry to two equivalent Ce(1), one Ni(3), two equivalent Ni(1), and one Al(4) atom. In the tenth Al site, Al(10) is bonded in a 2-coordinate geometry to one Ce(2), two equivalent Ce(1), two equivalent Ni(2), and one Al(3) atom. In the eleventh Al site, Al(11) is bonded in a 8-coordinate geometry to four equivalent Ce(2), two equivalent Al(3), and four equivalent Al(8) atoms. In the twelfth Al site, Al(12) is bonded in a distorted trigonal non-coplanar geometry to one Ce(1), one Ni(1), two equivalent Ni(3), and one Al(5) atom. is represented by the CIF card [CIF]
data_Ce4Al23Ni6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.260
_cell_length_b   8.260
_cell_length_c   18.310
_cell_angle_alpha   67.527
_cell_angle_beta   67.527
_cell_angle_gamma   28.849
_symmetry_Int_Tables_number   1
_cell_volume   553.797
_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
  Ce  Ce0  1  0.735  0.735  0.718  1.0
  Ce  Ce1  1  0.570  0.570  0.093  1.0
  Ce  Ce2  1  0.430  0.430  0.907  1.0
  Ce  Ce3  1  0.265  0.265  0.282  1.0
  Al  Al4  1  0.857  0.857  0.358  1.0
  Al  Al5  1  0.432  0.432  0.439  1.0
  Al  Al6  1  0.918  0.918  0.187  1.0
  Al  Al7  1  0.468  0.468  0.281  1.0
  Al  Al8  1  0.744  0.744  0.546  1.0
  Al  Al9  1  0.203  0.203  0.978  1.0
  Al  Al10  1  0.911  0.911  0.778  1.0
  Al  Al11  1  0.082  0.082  0.813  1.0
  Al  Al12  1  0.377  0.377  0.096  1.0
  Al  Al13  1  0.392  0.392  0.661  1.0
  Al  Al14  1  0.568  0.568  0.561  1.0
  Al  Al15  1  0.723  0.723  0.177  1.0
  Al  Al16  1  0.256  0.256  0.454  1.0
  Al  Al17  1  0.532  0.532  0.719  1.0
  Al  Al18  1  0.000  0.000  0.000  1.0
  Al  Al19  1  0.089  0.089  0.222  1.0
  Al  Al20  1  0.623  0.623  0.904  1.0
  Al  Al21  1  0.277  0.277  0.823  1.0
  Al  Al22  1  0.797  0.797  0.022  1.0
  Al  Al23  1  0.090  0.090  0.452  1.0
  Al  Al24  1  0.910  0.910  0.548  1.0
  Al  Al25  1  0.143  0.143  0.642  1.0
  Al  Al26  1  0.608  0.608  0.339  1.0
  Ni  Ni27  1  0.992  0.992  0.633  1.0
  Ni  Ni28  1  0.226  0.226  0.102  1.0
  Ni  Ni29  1  0.690  0.690  0.432  1.0
  Ni  Ni30  1  0.774  0.774  0.898  1.0
  Ni  Ni31  1  0.310  0.310  0.568  1.0
  Ni  Ni32  1  0.008  0.008  0.367  1.0
[/CIF]
.
The compound described by Ce4Ni6Al23 crystallizes in the monoclinic C2/m space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 15-coordinate geometry to two equivalent Ni(3), one Al(12), one Al(4), one Al(5), one Al(7), one Al(8), two equivalent Al(1), two equivalent Al(10), two equivalent Al(3), and two equivalent Al(9) atoms. In the second Ce site, Ce(2) is bonded in a 15-coordinate geometry to two equivalent Ni(2), one Al(10), one Al(4), two equivalent Al(11), two equivalent Al(3), two equivalent Al(7), two equivalent Al(8), 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 Ce(2), one Al(7), one Al(8), 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(1), one Al(12), one Al(7), two equivalent Al(2), two equivalent Al(4), and two equivalent Al(9) atoms. In the third Ni site, Ni(3) is bonded in a 8-coordinate geometry to two equivalent Ce(1), one Al(1), one Al(2), one Al(9), two equivalent Al(12), and three equivalent Al(5) atoms. There are twelve inequivalent Al sites. In the first Al site, Al(1) is bonded in a distorted bent 150 degrees geometry to two equivalent Ce(1), one Ni(1), one Ni(3), one Al(3), two equivalent Al(4), and two equivalent Al(5) atoms. In the second Al site, Al(2) is bonded in a distorted trigonal planar geometry to one Ni(3), two equivalent Ni(1), one Al(4), and one Al(5) atom. In the third Al site, Al(3) is bonded in a 12-coordinate geometry to two equivalent Ce(1), two equivalent Ce(2), one Al(1), one Al(10), one Al(11), one Al(7), two equivalent Al(4), and two equivalent Al(8) atoms. In the fourth Al site, Al(4) is bonded to one Ce(1), one Ce(2), two equivalent Ni(1), one Al(2), one Al(9), two equivalent Al(1), two equivalent Al(3), and two equivalent Al(7) atoms to form distorted face-sharing AlCe2Al8Ni2 cuboctahedra. In the fifth Al site, Al(5) is bonded in a 10-coordinate geometry to one Ce(1), three equivalent Ni(3), one Al(12), one Al(2), two equivalent Al(1), and two equivalent Al(5) atoms. In the sixth Al site, Al(6) is bonded in a 3-coordinate geometry to three equivalent Ce(2) and three equivalent Ni(2) atoms. In the seventh Al site, Al(7) is bonded in a distorted bent 150 degrees geometry to one Ce(1), two equivalent Ce(2), one Ni(1), one Ni(2), one Al(3), and two equivalent Al(4) atoms. In the eighth Al site, Al(8) is bonded in a distorted single-bond geometry to one Ce(1), two equivalent Ce(2), one Ni(2), two equivalent Al(11), and two equivalent Al(3) atoms. In the ninth Al site, Al(9) is bonded in a 3-coordinate geometry to two equivalent Ce(1), one Ni(3), two equivalent Ni(1), and one Al(4) atom. In the tenth Al site, Al(10) is bonded in a 2-coordinate geometry to one Ce(2), two equivalent Ce(1), two equivalent Ni(2), and one Al(3) atom. In the eleventh Al site, Al(11) is bonded in a 8-coordinate geometry to four equivalent Ce(2), two equivalent Al(3), and four equivalent Al(8) atoms. In the twelfth Al site, Al(12) is bonded in a distorted trigonal non-coplanar geometry to one Ce(1), one Ni(1), two equivalent Ni(3), and one Al(5) atom. is represented by the CIF card [CIF]
data_Ce4Al23Ni6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.260
_cell_length_b   8.260
_cell_length_c   18.310
_cell_angle_alpha   67.527
_cell_angle_beta   67.527
_cell_angle_gamma   28.849
_symmetry_Int_Tables_number   1
_cell_volume   553.797
_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
  Ce  Ce0  1  0.735  0.735  0.718  1.0
  Ce  Ce1  1  0.570  0.570  0.093  1.0
  Ce  Ce2  1  0.430  0.430  0.907  1.0
  Ce  Ce3  1  0.265  0.265  0.282  1.0
  Al  Al4  1  0.857  0.857  0.358  1.0
  Al  Al5  1  0.432  0.432  0.439  1.0
  Al  Al6  1  0.918  0.918  0.187  1.0
  Al  Al7  1  0.468  0.468  0.281  1.0
  Al  Al8  1  0.744  0.744  0.546  1.0
  Al  Al9  1  0.203  0.203  0.978  1.0
  Al  Al10  1  0.911  0.911  0.778  1.0
  Al  Al11  1  0.082  0.082  0.813  1.0
  Al  Al12  1  0.377  0.377  0.096  1.0
  Al  Al13  1  0.392  0.392  0.661  1.0
  Al  Al14  1  0.568  0.568  0.561  1.0
  Al  Al15  1  0.723  0.723  0.177  1.0
  Al  Al16  1  0.256  0.256  0.454  1.0
  Al  Al17  1  0.532  0.532  0.719  1.0
  Al  Al18  1  0.000  0.000  0.000  1.0
  Al  Al19  1  0.089  0.089  0.222  1.0
  Al  Al20  1  0.623  0.623  0.904  1.0
  Al  Al21  1  0.277  0.277  0.823  1.0
  Al  Al22  1  0.797  0.797  0.022  1.0
  Al  Al23  1  0.090  0.090  0.452  1.0
  Al  Al24  1  0.910  0.910  0.548  1.0
  Al  Al25  1  0.143  0.143  0.642  1.0
  Al  Al26  1  0.608  0.608  0.339  1.0
  Ni  Ni27  1  0.992  0.992  0.633  1.0
  Ni  Ni28  1  0.226  0.226  0.102  1.0
  Ni  Ni29  1  0.690  0.690  0.432  1.0
  Ni  Ni30  1  0.774  0.774  0.898  1.0
  Ni  Ni31  1  0.310  0.310  0.568  1.0
  Ni  Ni32  1  0.008  0.008  0.367  1.0
[/CIF]
.