The structure described by Np is alpha Np structured and crystallizes in the orthorhombic Pnma space group. There are two inequivalent Np sites. In the first Np site, Np(1) is bonded in a distorted see-saw-like geometry to four equivalent Np(2) atoms. In the second Np site, Np(2) is bonded to four equivalent Np(1) atoms to form a mixture of distorted corner and edge-sharing NpNp4 trigonal pyramids. is represented by the CIF card [CIF]
data_Np
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.633
_cell_length_b   4.766
_cell_length_c   6.561
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   144.875
_cell_formula_units_Z   8
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  0.221  0.047  1.0
  Np  Np1  1  0.750  0.779  0.953  1.0
  Np  Np2  1  0.750  0.721  0.453  1.0
  Np  Np3  1  0.250  0.279  0.547  1.0
  Np  Np4  1  0.250  0.867  0.319  1.0
  Np  Np5  1  0.750  0.133  0.681  1.0
  Np  Np6  1  0.750  0.367  0.181  1.0
  Np  Np7  1  0.250  0.633  0.819  1.0
[/CIF]
.
The structure described by Np is alpha Np structured and crystallizes in the orthorhombic Pnma space group. There are two inequivalent Np sites. In the first Np site, Np(1) is bonded in a distorted see-saw-like geometry to four equivalent Np(2) atoms. In the second Np site, Np(2) is bonded to four equivalent Np(1) atoms to form a mixture of distorted corner and edge-sharing NpNp4 trigonal pyramids. is represented by the CIF card [CIF]
data_Np
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.633
_cell_length_b   4.766
_cell_length_c   6.561
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   144.875
_cell_formula_units_Z   8
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  0.221  0.047  1.0
  Np  Np1  1  0.750  0.779  0.953  1.0
  Np  Np2  1  0.750  0.721  0.453  1.0
  Np  Np3  1  0.250  0.279  0.547  1.0
  Np  Np4  1  0.250  0.867  0.319  1.0
  Np  Np5  1  0.750  0.133  0.681  1.0
  Np  Np6  1  0.750  0.367  0.181  1.0
  Np  Np7  1  0.250  0.633  0.819  1.0
[/CIF]
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