data_HfTa3N
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.89
_cell_length_b   4.89
_cell_length_c   4.89
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   HfTa3N
_chemical_formula_sum   'Hf1 Ta3 N1'
_cell_volume   117.02
_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
  Hf  Hf1  1  0.45  0.45  0.45  1.0
  Ta  Ta2  1  0.45  0.0  0.45  1.0
  Ta  Ta3  1  0.45  0.45  0.0  1.0
  Ta  Ta4  1  0.0  0.45  0.45  1.0
  N  N0  1  0.0  0.0  0.0  1.0

data_HfTa3N
_symmetry_space_group_name_H-M   R3m
_cell_length_a   6.92
_cell_length_b   6.92
_cell_length_c   8.47
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   HfTa3N
_chemical_formula_sum   'Hf3 Ta9 N3'
_cell_volume   351.07
_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
  Hf  Hf0  3  0.0  0.0  0.45  1.0
  Ta  Ta1  9  0.04  0.52  0.96  1.0
  N  N2  3  0.0  0.0  0.0  1.0

Hf Ta Ta Ta N
Hf Ta Ta Ta N 0 3 o o o 0 1 o o o 0 2 o o o 0 4 o o o 1 4 + o + 1 4 + o o 1 4 o o + 1 4 o o o 2 4 + + o 2 4 + o o 2 4 o + o 2 4 o o o 3 4 o + + 3 4 o + o 3 4 o o + 3 4 o o o 
HfTa3N is (Cubic) Perovskite structured and crystallizes in the trigonal R3m space group. Hf(1) is bonded to six equivalent Ta(1) atoms to form corner-sharing HfTa6 octahedra. The corner-sharing octahedra are not tilted. There are three shorter (2.18 Å) and three longer (2.71 Å) Hf(1)-Ta(1) bond lengths. Ta(1) is bonded in a distorted T-shaped geometry to two equivalent Hf(1) and one N(1) atom. The Ta(1)-N(1) bond length is 3.08 Å. N(1) is bonded in a 3-coordinate geometry to three equivalent Ta(1) atoms.