The material described by Al4Sm crystallizes in the tetragonal I4/mmm space group. Sm(1) is bonded in a 16-coordinate geometry to eight equivalent Al(1) and eight equivalent Al(2) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 9-coordinate geometry to four equivalent Sm(1), one Al(1), and four equivalent Al(2) atoms. In the second Al site, Al(2) is bonded to four equivalent Sm(1), four equivalent Al(1), and four equivalent Al(2) atoms to form a mixture of corner, face, and edge-sharing AlSm4Al8 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_SmAl4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.451
_cell_length_b   6.451
_cell_length_c   6.451
_cell_angle_alpha   141.711
_cell_angle_beta   141.711
_cell_angle_gamma   55.264
_symmetry_Int_Tables_number   1
_cell_volume   102.308
_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
  Sm  Sm0  1  0.000  0.000  0.000  1.0
  Al  Al1  1  0.390  0.390  0.000  1.0
  Al  Al2  1  0.250  0.750  0.500  1.0
  Al  Al3  1  0.750  0.250  0.500  1.0
  Al  Al4  1  0.610  0.610  0.000  1.0
[/CIF]
.
The material described by Al4Sm crystallizes in the tetragonal I4/mmm space group. Sm(1) is bonded in a 16-coordinate geometry to eight equivalent Al(1) and eight equivalent Al(2) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 9-coordinate geometry to four equivalent Sm(1), one Al(1), and four equivalent Al(2) atoms. In the second Al site, Al(2) is bonded to four equivalent Sm(1), four equivalent Al(1), and four equivalent Al(2) atoms to form a mixture of corner, face, and edge-sharing AlSm4Al8 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_SmAl4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.451
_cell_length_b   6.451
_cell_length_c   6.451
_cell_angle_alpha   141.711
_cell_angle_beta   141.711
_cell_angle_gamma   55.264
_symmetry_Int_Tables_number   1
_cell_volume   102.308
_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
  Sm  Sm0  1  0.000  0.000  0.000  1.0
  Al  Al1  1  0.390  0.390  0.000  1.0
  Al  Al2  1  0.250  0.750  0.500  1.0
  Al  Al3  1  0.750  0.250  0.500  1.0
  Al  Al4  1  0.610  0.610  0.000  1.0
[/CIF]
.