The crystal structure described by AlPt2 crystallizes in the orthorhombic Pmma space group. There are five inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 5-coordinate geometry to one Al(3), two equivalent Al(1), and two equivalent Al(2) atoms. In the second Pt site, Pt(2) is bonded in a distorted square co-planar geometry to two equivalent Al(1) and two equivalent Al(2) atoms. In the third Pt site, Pt(3) is bonded in a 4-coordinate geometry to two equivalent Al(1) and two equivalent Al(2) atoms. In the fourth Pt site, Pt(4) is bonded to two equivalent Al(3) and four equivalent Al(2) atoms to form a mixture of distorted corner and edge-sharing PtAl6 cuboctahedra. In the fifth Pt site, Pt(5) is bonded in a 6-coordinate geometry to one Al(1), two equivalent Al(3), and three equivalent Al(2) atoms. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent Pt(3), two equivalent Pt(5), four equivalent Pt(1), and four equivalent Pt(2) atoms to form a mixture of face and corner-sharing AlPt12 cuboctahedra. In the second Al site, Al(2) is bonded in a 10-coordinate geometry to one Pt(3), two equivalent Pt(1), two equivalent Pt(2), two equivalent Pt(4), and three equivalent Pt(5) atoms. In the third Al site, Al(3) is bonded in a distorted body-centered cubic geometry to two equivalent Pt(1), two equivalent Pt(4), and four equivalent Pt(5) atoms. is represented by the CIF file [CIF]
data_AlPt2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.925
_cell_length_b   5.464
_cell_length_c   16.370
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   351.073
_cell_formula_units_Z   8
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
  Al  Al0  1  0.000  0.208  0.750  1.0
  Al  Al1  1  0.000  0.792  0.250  1.0
  Al  Al2  1  0.000  0.691  0.591  1.0
  Al  Al3  1  0.000  0.309  0.409  1.0
  Al  Al4  1  0.000  0.691  0.909  1.0
  Al  Al5  1  0.000  0.309  0.091  1.0
  Al  Al6  1  0.500  0.000  0.500  1.0
  Al  Al7  1  0.500  0.000  0.000  1.0
  Pt  Pt8  1  0.500  0.051  0.344  1.0
  Pt  Pt9  1  0.500  0.949  0.656  1.0
  Pt  Pt10  1  0.500  0.555  0.168  1.0
  Pt  Pt11  1  0.500  0.445  0.832  1.0
  Pt  Pt12  1  0.500  0.555  0.332  1.0
  Pt  Pt13  1  0.500  0.445  0.668  1.0
  Pt  Pt14  1  0.000  0.271  0.250  1.0
  Pt  Pt15  1  0.000  0.729  0.750  1.0
  Pt  Pt16  1  0.500  0.949  0.844  1.0
  Pt  Pt17  1  0.500  0.051  0.156  1.0
  Pt  Pt18  1  0.500  0.500  0.500  1.0
  Pt  Pt19  1  0.500  0.500  0.000  1.0
  Pt  Pt20  1  0.000  0.203  0.569  1.0
  Pt  Pt21  1  0.000  0.797  0.431  1.0
  Pt  Pt22  1  0.000  0.203  0.931  1.0
  Pt  Pt23  1  0.000  0.797  0.069  1.0
[/CIF]
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The crystal structure described by AlPt2 crystallizes in the orthorhombic Pmma space group. There are five inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 5-coordinate geometry to one Al(3), two equivalent Al(1), and two equivalent Al(2) atoms. In the second Pt site, Pt(2) is bonded in a distorted square co-planar geometry to two equivalent Al(1) and two equivalent Al(2) atoms. In the third Pt site, Pt(3) is bonded in a 4-coordinate geometry to two equivalent Al(1) and two equivalent Al(2) atoms. In the fourth Pt site, Pt(4) is bonded to two equivalent Al(3) and four equivalent Al(2) atoms to form a mixture of distorted corner and edge-sharing PtAl6 cuboctahedra. In the fifth Pt site, Pt(5) is bonded in a 6-coordinate geometry to one Al(1), two equivalent Al(3), and three equivalent Al(2) atoms. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent Pt(3), two equivalent Pt(5), four equivalent Pt(1), and four equivalent Pt(2) atoms to form a mixture of face and corner-sharing AlPt12 cuboctahedra. In the second Al site, Al(2) is bonded in a 10-coordinate geometry to one Pt(3), two equivalent Pt(1), two equivalent Pt(2), two equivalent Pt(4), and three equivalent Pt(5) atoms. In the third Al site, Al(3) is bonded in a distorted body-centered cubic geometry to two equivalent Pt(1), two equivalent Pt(4), and four equivalent Pt(5) atoms. is represented by the CIF file [CIF]
data_AlPt2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.925
_cell_length_b   5.464
_cell_length_c   16.370
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   351.073
_cell_formula_units_Z   8
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
  Al  Al0  1  0.000  0.208  0.750  1.0
  Al  Al1  1  0.000  0.792  0.250  1.0
  Al  Al2  1  0.000  0.691  0.591  1.0
  Al  Al3  1  0.000  0.309  0.409  1.0
  Al  Al4  1  0.000  0.691  0.909  1.0
  Al  Al5  1  0.000  0.309  0.091  1.0
  Al  Al6  1  0.500  0.000  0.500  1.0
  Al  Al7  1  0.500  0.000  0.000  1.0
  Pt  Pt8  1  0.500  0.051  0.344  1.0
  Pt  Pt9  1  0.500  0.949  0.656  1.0
  Pt  Pt10  1  0.500  0.555  0.168  1.0
  Pt  Pt11  1  0.500  0.445  0.832  1.0
  Pt  Pt12  1  0.500  0.555  0.332  1.0
  Pt  Pt13  1  0.500  0.445  0.668  1.0
  Pt  Pt14  1  0.000  0.271  0.250  1.0
  Pt  Pt15  1  0.000  0.729  0.750  1.0
  Pt  Pt16  1  0.500  0.949  0.844  1.0
  Pt  Pt17  1  0.500  0.051  0.156  1.0
  Pt  Pt18  1  0.500  0.500  0.500  1.0
  Pt  Pt19  1  0.500  0.500  0.000  1.0
  Pt  Pt20  1  0.000  0.203  0.569  1.0
  Pt  Pt21  1  0.000  0.797  0.431  1.0
  Pt  Pt22  1  0.000  0.203  0.931  1.0
  Pt  Pt23  1  0.000  0.797  0.069  1.0
[/CIF]
.