The crystal structure described by NpB4 crystallizes in the orthorhombic Cmmm space group. There are two inequivalent Np sites. In the first Np site, Np(1) is bonded in a 18-coordinate geometry to two equivalent B(2), four equivalent B(1), four equivalent B(3), four equivalent B(4), and four equivalent B(5) atoms. In the second Np site, Np(2) is bonded in a 18-coordinate geometry to two equivalent B(3), four equivalent B(1), four equivalent B(2), four equivalent B(4), and four equivalent B(5) atoms. There are five inequivalent B sites. In the first B site, B(1) is bonded in a 9-coordinate geometry to two equivalent Np(1), two equivalent Np(2), one B(1), two equivalent B(4), and two equivalent B(5) atoms. In the second B site, B(2) is bonded in a distorted trigonal planar geometry to two equivalent Np(1), four equivalent Np(2), one B(2), and two equivalent B(5) atoms. In the third B site, B(3) is bonded in a distorted trigonal planar geometry to two equivalent Np(2), four equivalent Np(1), one B(3), and two equivalent B(4) atoms. In the fourth B site, B(4) is bonded in a 9-coordinate geometry to two equivalent Np(1), two equivalent Np(2), one B(3), two equivalent B(1), and two equivalent B(5) atoms. In the fifth B site, B(5) is bonded in a 9-coordinate geometry to two equivalent Np(1), two equivalent Np(2), one B(2), two equivalent B(1), and two equivalent B(4) atoms. is represented by the CIF card [CIF]
data_NpB4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.024
_cell_length_b   7.109
_cell_length_c   7.109
_cell_angle_alpha   89.906
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   203.394
_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  0.000  0.314  0.814  1.0
  Np  Np1  1  0.000  0.686  0.186  1.0
  Np  Np2  1  0.000  0.187  0.313  1.0
  Np  Np3  1  0.000  0.813  0.687  1.0
  B  B4  1  0.799  0.500  0.500  1.0
  B  B5  1  0.799  0.000  0.000  1.0
  B  B6  1  0.201  0.500  0.500  1.0
  B  B7  1  0.201  0.000  0.000  1.0
  B  B8  1  0.500  0.087  0.587  1.0
  B  B9  1  0.500  0.913  0.413  1.0
  B  B10  1  0.500  0.412  0.088  1.0
  B  B11  1  0.500  0.588  0.912  1.0
  B  B12  1  0.500  0.538  0.677  1.0
  B  B13  1  0.500  0.462  0.323  1.0
  B  B14  1  0.500  0.962  0.177  1.0
  B  B15  1  0.500  0.038  0.823  1.0
  B  B16  1  0.500  0.677  0.462  1.0
  B  B17  1  0.500  0.323  0.538  1.0
  B  B18  1  0.500  0.177  0.038  1.0
  B  B19  1  0.500  0.823  0.962  1.0
[/CIF]
.
The crystal structure described by NpB4 crystallizes in the orthorhombic Cmmm space group. There are two inequivalent Np sites. In the first Np site, Np(1) is bonded in a 18-coordinate geometry to two equivalent B(2), four equivalent B(1), four equivalent B(3), four equivalent B(4), and four equivalent B(5) atoms. In the second Np site, Np(2) is bonded in a 18-coordinate geometry to two equivalent B(3), four equivalent B(1), four equivalent B(2), four equivalent B(4), and four equivalent B(5) atoms. There are five inequivalent B sites. In the first B site, B(1) is bonded in a 9-coordinate geometry to two equivalent Np(1), two equivalent Np(2), one B(1), two equivalent B(4), and two equivalent B(5) atoms. In the second B site, B(2) is bonded in a distorted trigonal planar geometry to two equivalent Np(1), four equivalent Np(2), one B(2), and two equivalent B(5) atoms. In the third B site, B(3) is bonded in a distorted trigonal planar geometry to two equivalent Np(2), four equivalent Np(1), one B(3), and two equivalent B(4) atoms. In the fourth B site, B(4) is bonded in a 9-coordinate geometry to two equivalent Np(1), two equivalent Np(2), one B(3), two equivalent B(1), and two equivalent B(5) atoms. In the fifth B site, B(5) is bonded in a 9-coordinate geometry to two equivalent Np(1), two equivalent Np(2), one B(2), two equivalent B(1), and two equivalent B(4) atoms. is represented by the CIF card [CIF]
data_NpB4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.024
_cell_length_b   7.109
_cell_length_c   7.109
_cell_angle_alpha   89.906
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   203.394
_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  0.000  0.314  0.814  1.0
  Np  Np1  1  0.000  0.686  0.186  1.0
  Np  Np2  1  0.000  0.187  0.313  1.0
  Np  Np3  1  0.000  0.813  0.687  1.0
  B  B4  1  0.799  0.500  0.500  1.0
  B  B5  1  0.799  0.000  0.000  1.0
  B  B6  1  0.201  0.500  0.500  1.0
  B  B7  1  0.201  0.000  0.000  1.0
  B  B8  1  0.500  0.087  0.587  1.0
  B  B9  1  0.500  0.913  0.413  1.0
  B  B10  1  0.500  0.412  0.088  1.0
  B  B11  1  0.500  0.588  0.912  1.0
  B  B12  1  0.500  0.538  0.677  1.0
  B  B13  1  0.500  0.462  0.323  1.0
  B  B14  1  0.500  0.962  0.177  1.0
  B  B15  1  0.500  0.038  0.823  1.0
  B  B16  1  0.500  0.677  0.462  1.0
  B  B17  1  0.500  0.323  0.538  1.0
  B  B18  1  0.500  0.177  0.038  1.0
  B  B19  1  0.500  0.823  0.962  1.0
[/CIF]
.