The material structure described by NpCo2Si2 crystallizes in the tetragonal I4/mmm space group. Np(1) is bonded in a 16-coordinate geometry to eight equivalent Co(1) and eight equivalent Si(1) atoms. Co(1) is bonded in a 4-coordinate geometry to four equivalent Np(1) and four equivalent Si(1) atoms. Si(1) is bonded in a 9-coordinate geometry to four equivalent Np(1), four equivalent Co(1), and one Si(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Np(CoSi)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.606
_cell_length_b   5.606
_cell_length_c   5.606
_cell_angle_alpha   139.822
_cell_angle_beta   139.822
_cell_angle_gamma   58.124
_symmetry_Int_Tables_number   1
_cell_volume   72.689
_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
  Np  Np0  1  0.000  0.000  0.000  1.0
  Co  Co1  1  0.750  0.250  0.500  1.0
  Co  Co2  1  0.250  0.750  0.500  1.0
  Si  Si3  1  0.629  0.629  0.000  1.0
  Si  Si4  1  0.371  0.371  0.000  1.0
[/CIF]
.
The material structure described by NpCo2Si2 crystallizes in the tetragonal I4/mmm space group. Np(1) is bonded in a 16-coordinate geometry to eight equivalent Co(1) and eight equivalent Si(1) atoms. Co(1) is bonded in a 4-coordinate geometry to four equivalent Np(1) and four equivalent Si(1) atoms. Si(1) is bonded in a 9-coordinate geometry to four equivalent Np(1), four equivalent Co(1), and one Si(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Np(CoSi)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.606
_cell_length_b   5.606
_cell_length_c   5.606
_cell_angle_alpha   139.822
_cell_angle_beta   139.822
_cell_angle_gamma   58.124
_symmetry_Int_Tables_number   1
_cell_volume   72.689
_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
  Np  Np0  1  0.000  0.000  0.000  1.0
  Co  Co1  1  0.750  0.250  0.500  1.0
  Co  Co2  1  0.250  0.750  0.500  1.0
  Si  Si3  1  0.629  0.629  0.000  1.0
  Si  Si4  1  0.371  0.371  0.000  1.0
[/CIF]
.