The material described by NpAl3 crystallizes in the hexagonal P6_3/mmc space group. Np(1) is bonded to twelve equivalent Al(1) atoms to form a mixture of face and corner-sharing NpAl12 cuboctahedra. Al(1) is bonded in a 10-coordinate geometry to four equivalent Np(1) and six equivalent Al(1) atoms. is represented by the CIF card [CIF]
data_NpAl3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.173
_cell_length_b   6.173
_cell_length_c   4.701
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   155.111
_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
  Np  Np0  1  0.333  0.667  0.750  1.0
  Np  Np1  1  0.667  0.333  0.250  1.0
  Al  Al2  1  0.154  0.307  0.250  1.0
  Al  Al3  1  0.693  0.846  0.250  1.0
  Al  Al4  1  0.154  0.846  0.250  1.0
  Al  Al5  1  0.846  0.693  0.750  1.0
  Al  Al6  1  0.307  0.154  0.750  1.0
  Al  Al7  1  0.846  0.154  0.750  1.0
[/CIF]
.
The material described by NpAl3 crystallizes in the hexagonal P6_3/mmc space group. Np(1) is bonded to twelve equivalent Al(1) atoms to form a mixture of face and corner-sharing NpAl12 cuboctahedra. Al(1) is bonded in a 10-coordinate geometry to four equivalent Np(1) and six equivalent Al(1) atoms. is represented by the CIF card [CIF]
data_NpAl3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.173
_cell_length_b   6.173
_cell_length_c   4.701
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   155.111
_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
  Np  Np0  1  0.333  0.667  0.750  1.0
  Np  Np1  1  0.667  0.333  0.250  1.0
  Al  Al2  1  0.154  0.307  0.250  1.0
  Al  Al3  1  0.693  0.846  0.250  1.0
  Al  Al4  1  0.154  0.846  0.250  1.0
  Al  Al5  1  0.846  0.693  0.750  1.0
  Al  Al6  1  0.307  0.154  0.750  1.0
  Al  Al7  1  0.846  0.154  0.750  1.0
[/CIF]
.