data_TbNp2Cd
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.2
_cell_length_b   5.2
_cell_length_c   5.2
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   TbNp2Cd
_chemical_formula_sum   'Tb1 Np2 Cd1'
_cell_volume   99.27
_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
  Tb  Tb3  1  0.68  0.68  0.68  1.0
  Np  Np1  1  0.84  0.84  0.84  1.0
  Np  Np2  1  0.51  0.51  0.51  1.0
  Cd  Cd0  1  0.0  0.0  0.0  1.0

data_TbNp2Cd
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.2
_cell_length_b   5.2
_cell_length_c   12.73
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   TbNp2Cd
_chemical_formula_sum   'Tb3 Np6 Cd3'
_cell_volume   297.81
_cell_formula_units_Z   3
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-y, x-y, z'
  3  '-x+y, -x, z'
  4  '-y, -x, z'
  5  '-x+y, y, z'
  6  'x, x-y, z'
  7  'x+1/3, y+2/3, z+2/3'
  8  '-y+1/3, x-y+2/3, z+2/3'
  9  '-x+y+1/3, -x+2/3, z+2/3'
  10  '-y+1/3, -x+2/3, z+2/3'
  11  '-x+y+1/3, y+2/3, z+2/3'
  12  'x+1/3, x-y+2/3, z+2/3'
  13  'x+2/3, y+1/3, z+1/3'
  14  '-y+2/3, x-y+1/3, z+1/3'
  15  '-x+y+2/3, -x+1/3, z+1/3'
  16  '-y+2/3, -x+1/3, z+1/3'
  17  '-x+y+2/3, y+1/3, z+1/3'
  18  'x+2/3, x-y+1/3, z+1/3'
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
  Tb  Tb0  3  0.0  0.0  0.32  1.0
  Np  Np1  3  0.0  0.0  0.16  1.0
  Np  Np2  3  0.0  0.0  0.49  1.0
  Cd  Cd3  3  0.0  0.0  0.0  1.0

Tb Np Np Cd
Np2TbCd crystallizes in the trigonal R3m space group. There are two inequivalent Np sites. In the first Np site, Np(1) is bonded in a linear geometry to one Tb(1) and one Cd(1) atom. The Np(1)-Tb(1) bond length is 2.07 Å. The Np(1)-Cd(1) bond length is 2.07 Å. In the second Np site, Np(2) is bonded in a single-bond geometry to one Tb(1) atom. The Np(2)-Tb(1) bond length is 2.07 Å. Tb(1) is bonded to one Np(1), one Np(2), and three equivalent Cd(1) atoms to form distorted TbNp2Cd3 trigonal bipyramids that share corners with six equivalent Tb(1)Np2Cd3 trigonal bipyramids and  a cornercorner with one Cd(1)Tb3Np trigonal pyramid. All Tb(1)-Cd(1) bond lengths are 3.00 Å. Cd(1) is bonded to one Np(1) and three equivalent Tb(1) atoms to form distorted CdTb3Np trigonal pyramids that share  a cornercorner with one Tb(1)Np2Cd3 trigonal bipyramid and corners with six equivalent Cd(1)Tb3Np trigonal pyramids.