The material described by NpSi crystallizes in the orthorhombic Pnma space group. Np(1) is bonded in a 8-coordinate geometry to two equivalent Np(1) and six equivalent Si(1) atoms. Si(1) is bonded in a 10-coordinate geometry to six equivalent Np(1) and four equivalent Si(1) atoms. is represented by the CIF card [CIF]
data_NpSi
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.573
_cell_length_b   5.470
_cell_length_c   9.539
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   134.243
_cell_formula_units_Z   4
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  0.250  0.433  0.729  1.0
  Np  Np1  1  0.750  0.567  0.271  1.0
  Np  Np2  1  0.750  0.933  0.771  1.0
  Np  Np3  1  0.250  0.067  0.229  1.0
  Si  Si4  1  0.250  0.804  0.509  1.0
  Si  Si5  1  0.750  0.196  0.491  1.0
  Si  Si6  1  0.750  0.304  0.991  1.0
  Si  Si7  1  0.250  0.696  0.009  1.0
[/CIF]
.
The material described by NpSi crystallizes in the orthorhombic Pnma space group. Np(1) is bonded in a 8-coordinate geometry to two equivalent Np(1) and six equivalent Si(1) atoms. Si(1) is bonded in a 10-coordinate geometry to six equivalent Np(1) and four equivalent Si(1) atoms. is represented by the CIF card [CIF]
data_NpSi
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.573
_cell_length_b   5.470
_cell_length_c   9.539
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   134.243
_cell_formula_units_Z   4
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  0.250  0.433  0.729  1.0
  Np  Np1  1  0.750  0.567  0.271  1.0
  Np  Np2  1  0.750  0.933  0.771  1.0
  Np  Np3  1  0.250  0.067  0.229  1.0
  Si  Si4  1  0.250  0.804  0.509  1.0
  Si  Si5  1  0.750  0.196  0.491  1.0
  Si  Si6  1  0.750  0.304  0.991  1.0
  Si  Si7  1  0.250  0.696  0.009  1.0
[/CIF]
.