data_NdNpAg2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.07
_cell_length_b   5.07
_cell_length_c   5.07
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   NdNpAg2
_chemical_formula_sum   'Nd1 Np1 Ag2'
_cell_volume   92.21
_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
  Nd  Nd2  1  0.0  0.0  0.0  1.0
  Np  Np3  1  0.59  0.59  0.59  1.0
  Ag  Ag0  1  0.79  0.79  0.79  1.0
  Ag  Ag1  1  0.38  0.38  0.38  1.0

data_NdNpAg2
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.07
_cell_length_b   5.07
_cell_length_c   12.42
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   NdNpAg2
_chemical_formula_sum   'Nd3 Np3 Ag6'
_cell_volume   276.62
_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
  Nd  Nd0  3  0.0  0.0  0.0  1.0
  Np  Np1  3  0.0  0.0  0.41  1.0
  Ag  Ag2  3  0.0  0.0  0.21  1.0
  Ag  Ag3  3  0.0  0.0  0.62  1.0

Nd Np Ag Ag
Nd Np Ag Ag 0 2 - - - 0 2 - - o 0 2 o - - 0 2 - o - 0 1 - - o 0 1 - o - 0 1 o - - 0 3 - o o 0 3 o - o 0 3 o o - 1 3 o o o 1 3 o o + 1 3 + o o 1 3 o + o 1 2 o - o 1 2 - o o 1 2 o o - 1 2 o o o 2 3 o o + 2 3 o + o 2 3 + o o 
NpNdAg2 is Heusler structured and crystallizes in the trigonal R3m space group. Np(1) is bonded in a distorted linear geometry to three equivalent Nd(1), one Ag(1), and one Ag(2) atom. All Np(1)-Nd(1) bond lengths are 3.10 Å. The Np(1)-Ag(1) bond length is 2.57 Å. The Np(1)-Ag(2) bond length is 2.57 Å. Nd(1) is bonded in a 10-coordinate geometry to three equivalent Np(1), three equivalent Ag(2), and four equivalent Ag(1) atoms. All Nd(1)-Ag(2) bond lengths are 2.98 Å. There is one shorter (2.57 Å) and three longer (3.32 Å) Nd(1)-Ag(1) bond lengths. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a distorted linear geometry to one Np(1) and four equivalent Nd(1) atoms. In the second Ag site, Ag(2) is bonded in a 4-coordinate geometry to one Np(1) and three equivalent Nd(1) atoms.