The structure described by Er4Pt9Al24 crystallizes in the triclinic P-1 space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 17-coordinate geometry to one Pt(2), one Pt(3), one Pt(4), one Pt(5), two equivalent Pt(1), one Al(1), one Al(10), one Al(12), one Al(2), one Al(3), one Al(4), one Al(5), one Al(6), one Al(8), and two equivalent Al(9) atoms. In the second Er site, Er(2) is bonded in a 17-coordinate geometry to one Pt(2), one Pt(3), one Pt(4), one Pt(5), two equivalent Pt(1), one Al(1), one Al(10), one Al(12), one Al(3), one Al(4), one Al(5), one Al(6), one Al(7), one Al(9), and two equivalent Al(2) atoms. There are five inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 8-coordinate geometry to two equivalent Er(1), two equivalent Er(2), one Al(3), one Al(5), two equivalent Al(12), two equivalent Al(2), and two equivalent Al(9) atoms. In the second Pt site, Pt(2) is bonded in a 8-coordinate geometry to one Er(1), one Er(2), one Al(10), one Al(4), one Al(5), one Al(6), one Al(7), one Al(8), and two equivalent Al(11) atoms. In the third Pt site, Pt(3) is bonded in a 8-coordinate geometry to one Er(1), one Er(2), one Al(1), one Al(10), one Al(11), one Al(4), one Al(6), one Al(7), and two equivalent Al(8) atoms. In the fourth Pt site, Pt(4) is bonded in a 8-coordinate geometry to one Er(1), one Er(2), one Al(10), one Al(11), one Al(3), one Al(4), one Al(6), one Al(8), and two equivalent Al(7) atoms. In the fifth Pt site, Pt(5) is bonded in a 8-coordinate geometry to two equivalent Er(1), two equivalent Er(2), two equivalent Al(1), two equivalent Al(12), two equivalent Al(2), and two equivalent Al(9) atoms. There are twelve inequivalent Al sites. In the first Al site, Al(1) is bonded in a 2-coordinate geometry to one Er(1), one Er(2), one Pt(3), and one Pt(5) atom. In the second Al site, Al(2) is bonded in a 3-coordinate geometry to one Er(1), two equivalent Er(2), one Pt(5), and two equivalent Pt(1) atoms. In the third Al site, Al(3) is bonded in a 2-coordinate geometry to one Er(1), one Er(2), one Pt(1), and one Pt(4) atom. In the fourth Al site, Al(4) is bonded in a 3-coordinate geometry to one Er(1), one Er(2), one Pt(2), one Pt(3), and one Pt(4) atom. In the fifth Al site, Al(5) is bonded in a 2-coordinate geometry to one Er(1), one Er(2), one Pt(1), and one Pt(2) atom. In the sixth Al site, Al(6) is bonded in a 3-coordinate geometry to one Er(1), one Er(2), one Pt(2), one Pt(3), and one Pt(4) atom. In the seventh Al site, Al(7) is bonded to one Er(2), one Pt(2), one Pt(3), and two equivalent Pt(4) atoms to form distorted AlErPt4 tetrahedra that share corners with three equivalent Al(8)ErPt4 tetrahedra, corners with three equivalent Al(11)Pt4 tetrahedra,  an edgeedge with one Al(7)ErPt4 tetrahedra,  an edgeedge with one Al(8)ErPt4 tetrahedra, and  an edgeedge with one Al(11)Pt4 tetrahedra. In the eighth Al site, Al(8) is bonded to one Er(1), one Pt(2), one Pt(4), and two equivalent Pt(3) atoms to form distorted AlErPt4 tetrahedra that share corners with three equivalent Al(7)ErPt4 tetrahedra, corners with three equivalent Al(11)Pt4 tetrahedra,  an edgeedge with one Al(7)ErPt4 tetrahedra,  an edgeedge with one Al(8)ErPt4 tetrahedra, and  an edgeedge with one Al(11)Pt4 tetrahedra. In the ninth Al site, Al(9) is bonded in a 3-coordinate geometry to one Er(2), two equivalent Er(1), one Pt(5), and two equivalent Pt(1) atoms. In the tenth Al site, Al(10) is bonded in a 3-coordinate geometry to one Er(1), one Er(2), one Pt(2), one Pt(3), and one Pt(4) atom. In the eleventh Al site, Al(11) is bonded to one Pt(3), one Pt(4), and two equivalent Pt(2) atoms to form distorted AlPt4 tetrahedra that share corners with three equivalent Al(7)ErPt4 tetrahedra, corners with three equivalent Al(8)ErPt4 tetrahedra,  an edgeedge with one Al(7)ErPt4 tetrahedra,  an edgeedge with one Al(8)ErPt4 tetrahedra, and  an edgeedge with one Al(11)Pt4 tetrahedra. In the twelfth Al site, Al(12) is bonded in a 3-coordinate geometry to one Er(1), one Er(2), one Pt(5), and two equivalent Pt(1) atoms. is represented by the CIF card [CIF]
data_Er4(Al8Pt3)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.472
_cell_length_b   7.469
_cell_length_c   13.057
_cell_angle_alpha   84.539
_cell_angle_beta   100.933
_cell_angle_gamma   119.881
_symmetry_Int_Tables_number   1
_cell_volume   620.359
_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  0.733  0.999  0.192  1.0
  Er  Er1  1  0.267  0.001  0.808  1.0
  Er  Er2  1  0.062  0.668  0.192  1.0
  Er  Er3  1  0.938  0.332  0.808  1.0
  Al  Al4  1  0.808  0.869  0.816  1.0
  Al  Al5  1  0.192  0.131  0.184  1.0
  Al  Al6  1  0.982  0.666  0.945  1.0
  Al  Al7  1  0.018  0.334  0.055  1.0
  Al  Al8  1  0.398  0.664  0.817  1.0
  Al  Al9  1  0.602  0.336  0.183  1.0
  Al  Al10  1  0.883  0.665  0.671  1.0
  Al  Al11  1  0.117  0.335  0.329  1.0
  Al  Al12  1  0.603  0.458  0.816  1.0
  Al  Al13  1  0.397  0.542  0.184  1.0
  Al  Al14  1  0.230  0.340  0.670  1.0
  Al  Al15  1  0.770  0.660  0.330  1.0
  Al  Al16  1  0.853  0.333  0.559  1.0
  Al  Al17  1  0.186  0.999  0.559  1.0
  Al  Al18  1  0.814  0.001  0.441  1.0
  Al  Al19  1  0.352  1.000  0.055  1.0
  Al  Al20  1  0.648  0.000  0.945  1.0
  Al  Al21  1  0.556  0.993  0.671  1.0
  Al  Al22  1  0.444  0.007  0.329  1.0
  Al  Al23  1  0.521  0.667  0.561  1.0
  Al  Al24  1  0.479  0.333  0.439  1.0
  Al  Al25  1  0.683  0.668  0.046  1.0
  Al  Al26  1  0.317  0.332  0.954  1.0
  Al  Al27  1  0.147  0.667  0.441  1.0
  Pt  Pt28  1  0.328  0.672  0.000  1.0
  Pt  Pt29  1  0.546  0.325  0.638  1.0
  Pt  Pt30  1  0.454  0.675  0.362  1.0
  Pt  Pt31  1  0.888  0.008  0.639  1.0
  Pt  Pt32  1  0.112  0.992  0.361  1.0
  Pt  Pt33  1  0.672  0.328  1.000  1.0
  Pt  Pt34  1  0.204  0.667  0.639  1.0
  Pt  Pt35  1  0.796  0.333  0.361  1.0
  Pt  Pt36  1  0.000  0.000  0.000  1.0
[/CIF]
.
The structure described by Er4Pt9Al24 crystallizes in the triclinic P-1 space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 17-coordinate geometry to one Pt(2), one Pt(3), one Pt(4), one Pt(5), two equivalent Pt(1), one Al(1), one Al(10), one Al(12), one Al(2), one Al(3), one Al(4), one Al(5), one Al(6), one Al(8), and two equivalent Al(9) atoms. In the second Er site, Er(2) is bonded in a 17-coordinate geometry to one Pt(2), one Pt(3), one Pt(4), one Pt(5), two equivalent Pt(1), one Al(1), one Al(10), one Al(12), one Al(3), one Al(4), one Al(5), one Al(6), one Al(7), one Al(9), and two equivalent Al(2) atoms. There are five inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 8-coordinate geometry to two equivalent Er(1), two equivalent Er(2), one Al(3), one Al(5), two equivalent Al(12), two equivalent Al(2), and two equivalent Al(9) atoms. In the second Pt site, Pt(2) is bonded in a 8-coordinate geometry to one Er(1), one Er(2), one Al(10), one Al(4), one Al(5), one Al(6), one Al(7), one Al(8), and two equivalent Al(11) atoms. In the third Pt site, Pt(3) is bonded in a 8-coordinate geometry to one Er(1), one Er(2), one Al(1), one Al(10), one Al(11), one Al(4), one Al(6), one Al(7), and two equivalent Al(8) atoms. In the fourth Pt site, Pt(4) is bonded in a 8-coordinate geometry to one Er(1), one Er(2), one Al(10), one Al(11), one Al(3), one Al(4), one Al(6), one Al(8), and two equivalent Al(7) atoms. In the fifth Pt site, Pt(5) is bonded in a 8-coordinate geometry to two equivalent Er(1), two equivalent Er(2), two equivalent Al(1), two equivalent Al(12), two equivalent Al(2), and two equivalent Al(9) atoms. There are twelve inequivalent Al sites. In the first Al site, Al(1) is bonded in a 2-coordinate geometry to one Er(1), one Er(2), one Pt(3), and one Pt(5) atom. In the second Al site, Al(2) is bonded in a 3-coordinate geometry to one Er(1), two equivalent Er(2), one Pt(5), and two equivalent Pt(1) atoms. In the third Al site, Al(3) is bonded in a 2-coordinate geometry to one Er(1), one Er(2), one Pt(1), and one Pt(4) atom. In the fourth Al site, Al(4) is bonded in a 3-coordinate geometry to one Er(1), one Er(2), one Pt(2), one Pt(3), and one Pt(4) atom. In the fifth Al site, Al(5) is bonded in a 2-coordinate geometry to one Er(1), one Er(2), one Pt(1), and one Pt(2) atom. In the sixth Al site, Al(6) is bonded in a 3-coordinate geometry to one Er(1), one Er(2), one Pt(2), one Pt(3), and one Pt(4) atom. In the seventh Al site, Al(7) is bonded to one Er(2), one Pt(2), one Pt(3), and two equivalent Pt(4) atoms to form distorted AlErPt4 tetrahedra that share corners with three equivalent Al(8)ErPt4 tetrahedra, corners with three equivalent Al(11)Pt4 tetrahedra,  an edgeedge with one Al(7)ErPt4 tetrahedra,  an edgeedge with one Al(8)ErPt4 tetrahedra, and  an edgeedge with one Al(11)Pt4 tetrahedra. In the eighth Al site, Al(8) is bonded to one Er(1), one Pt(2), one Pt(4), and two equivalent Pt(3) atoms to form distorted AlErPt4 tetrahedra that share corners with three equivalent Al(7)ErPt4 tetrahedra, corners with three equivalent Al(11)Pt4 tetrahedra,  an edgeedge with one Al(7)ErPt4 tetrahedra,  an edgeedge with one Al(8)ErPt4 tetrahedra, and  an edgeedge with one Al(11)Pt4 tetrahedra. In the ninth Al site, Al(9) is bonded in a 3-coordinate geometry to one Er(2), two equivalent Er(1), one Pt(5), and two equivalent Pt(1) atoms. In the tenth Al site, Al(10) is bonded in a 3-coordinate geometry to one Er(1), one Er(2), one Pt(2), one Pt(3), and one Pt(4) atom. In the eleventh Al site, Al(11) is bonded to one Pt(3), one Pt(4), and two equivalent Pt(2) atoms to form distorted AlPt4 tetrahedra that share corners with three equivalent Al(7)ErPt4 tetrahedra, corners with three equivalent Al(8)ErPt4 tetrahedra,  an edgeedge with one Al(7)ErPt4 tetrahedra,  an edgeedge with one Al(8)ErPt4 tetrahedra, and  an edgeedge with one Al(11)Pt4 tetrahedra. In the twelfth Al site, Al(12) is bonded in a 3-coordinate geometry to one Er(1), one Er(2), one Pt(5), and two equivalent Pt(1) atoms. is represented by the CIF card [CIF]
data_Er4(Al8Pt3)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.472
_cell_length_b   7.469
_cell_length_c   13.057
_cell_angle_alpha   84.539
_cell_angle_beta   100.933
_cell_angle_gamma   119.881
_symmetry_Int_Tables_number   1
_cell_volume   620.359
_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  0.733  0.999  0.192  1.0
  Er  Er1  1  0.267  0.001  0.808  1.0
  Er  Er2  1  0.062  0.668  0.192  1.0
  Er  Er3  1  0.938  0.332  0.808  1.0
  Al  Al4  1  0.808  0.869  0.816  1.0
  Al  Al5  1  0.192  0.131  0.184  1.0
  Al  Al6  1  0.982  0.666  0.945  1.0
  Al  Al7  1  0.018  0.334  0.055  1.0
  Al  Al8  1  0.398  0.664  0.817  1.0
  Al  Al9  1  0.602  0.336  0.183  1.0
  Al  Al10  1  0.883  0.665  0.671  1.0
  Al  Al11  1  0.117  0.335  0.329  1.0
  Al  Al12  1  0.603  0.458  0.816  1.0
  Al  Al13  1  0.397  0.542  0.184  1.0
  Al  Al14  1  0.230  0.340  0.670  1.0
  Al  Al15  1  0.770  0.660  0.330  1.0
  Al  Al16  1  0.853  0.333  0.559  1.0
  Al  Al17  1  0.186  0.999  0.559  1.0
  Al  Al18  1  0.814  0.001  0.441  1.0
  Al  Al19  1  0.352  1.000  0.055  1.0
  Al  Al20  1  0.648  0.000  0.945  1.0
  Al  Al21  1  0.556  0.993  0.671  1.0
  Al  Al22  1  0.444  0.007  0.329  1.0
  Al  Al23  1  0.521  0.667  0.561  1.0
  Al  Al24  1  0.479  0.333  0.439  1.0
  Al  Al25  1  0.683  0.668  0.046  1.0
  Al  Al26  1  0.317  0.332  0.954  1.0
  Al  Al27  1  0.147  0.667  0.441  1.0
  Pt  Pt28  1  0.328  0.672  0.000  1.0
  Pt  Pt29  1  0.546  0.325  0.638  1.0
  Pt  Pt30  1  0.454  0.675  0.362  1.0
  Pt  Pt31  1  0.888  0.008  0.639  1.0
  Pt  Pt32  1  0.112  0.992  0.361  1.0
  Pt  Pt33  1  0.672  0.328  1.000  1.0
  Pt  Pt34  1  0.204  0.667  0.639  1.0
  Pt  Pt35  1  0.796  0.333  0.361  1.0
  Pt  Pt36  1  0.000  0.000  0.000  1.0
[/CIF]
.