The crystal structure described by Al4Sm crystallizes in the orthorhombic Imma space group. Sm(1) is bonded in a 13-coordinate geometry to three equivalent Al(2), four equivalent Al(1), and six equivalent Al(3) atoms. There are three inequivalent Al sites. In the first Al site, Al(3) is bonded in a 10-coordinate geometry to three equivalent Sm(1), one Al(1), three equivalent Al(2), and three equivalent Al(3) atoms. In the second Al site, Al(1) is bonded in a 6-coordinate geometry to four equivalent Sm(1) and two equivalent Al(3) atoms. In the third Al site, Al(2) is bonded in a 9-coordinate geometry to three equivalent Sm(1) and six equivalent Al(3) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_SmAl4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.882
_cell_length_b   7.882
_cell_length_c   7.882
_cell_angle_alpha   147.324
_cell_angle_beta   132.215
_cell_angle_gamma   59.093
_symmetry_Int_Tables_number   1
_cell_volume   194.154
_cell_formula_units_Z   2
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  0.136  0.886  0.250  1.0
  Sm  Sm1  1  0.864  0.114  0.750  1.0
  Al  Al2  1  0.500  0.500  0.000  1.0
  Al  Al3  1  0.000  0.500  0.500  1.0
  Al  Al4  1  0.364  0.114  0.250  1.0
  Al  Al5  1  0.636  0.886  0.750  1.0
  Al  Al6  1  0.656  0.698  0.958  1.0
  Al  Al7  1  0.344  0.302  0.042  1.0
  Al  Al8  1  0.760  0.302  0.458  1.0
  Al  Al9  1  0.240  0.698  0.542  1.0
[/CIF]
.
The crystal structure described by Al4Sm crystallizes in the orthorhombic Imma space group. Sm(1) is bonded in a 13-coordinate geometry to three equivalent Al(2), four equivalent Al(1), and six equivalent Al(3) atoms. There are three inequivalent Al sites. In the first Al site, Al(3) is bonded in a 10-coordinate geometry to three equivalent Sm(1), one Al(1), three equivalent Al(2), and three equivalent Al(3) atoms. In the second Al site, Al(1) is bonded in a 6-coordinate geometry to four equivalent Sm(1) and two equivalent Al(3) atoms. In the third Al site, Al(2) is bonded in a 9-coordinate geometry to three equivalent Sm(1) and six equivalent Al(3) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_SmAl4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.882
_cell_length_b   7.882
_cell_length_c   7.882
_cell_angle_alpha   147.324
_cell_angle_beta   132.215
_cell_angle_gamma   59.093
_symmetry_Int_Tables_number   1
_cell_volume   194.154
_cell_formula_units_Z   2
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  0.136  0.886  0.250  1.0
  Sm  Sm1  1  0.864  0.114  0.750  1.0
  Al  Al2  1  0.500  0.500  0.000  1.0
  Al  Al3  1  0.000  0.500  0.500  1.0
  Al  Al4  1  0.364  0.114  0.250  1.0
  Al  Al5  1  0.636  0.886  0.750  1.0
  Al  Al6  1  0.656  0.698  0.958  1.0
  Al  Al7  1  0.344  0.302  0.042  1.0
  Al  Al8  1  0.760  0.302  0.458  1.0
  Al  Al9  1  0.240  0.698  0.542  1.0
[/CIF]
.