data_NaHfAs2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.81
_cell_length_b   4.81
_cell_length_c   4.81
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   NaHfAs2
_chemical_formula_sum   'Na1 Hf1 As2'
_cell_volume   78.66
_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
  Na  Na3  1  0.0  0.0  0.0  1.0
  Hf  Hf2  1  0.4  0.4  0.4  1.0
  As  As0  1  0.7  0.7  0.7  1.0
  As  As1  1  0.1  0.1  0.1  1.0

data_NaHfAs2
_symmetry_space_group_name_H-M   R3m
_cell_length_a   4.81
_cell_length_b   4.81
_cell_length_c   11.78
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   NaHfAs2
_chemical_formula_sum   'Na3 Hf3 As6'
_cell_volume   235.99
_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
  Na  Na0  3  0.0  0.0  0.0  1.0
  Hf  Hf1  3  0.0  0.0  0.6  1.0
  As  As2  3  0.0  0.0  0.3  1.0
  As  As3  3  0.0  0.0  0.9  1.0

Na Hf As As
Na Hf As As 0 3 o o o 0 1 o o - 0 1 o - o 0 1 - o o 0 2 o - - 0 2 - o - 0 2 - - 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 - 2 3 o + + 2 3 + o + 2 3 + + o 
NaHfAs2 crystallizes in the trigonal R3m space group. Na(1) is bonded in a single-bond geometry to three equivalent Hf(1), one As(2), and three equivalent As(1) atoms. All Na(1)-Hf(1) bond lengths are 2.89 Å. The Na(1)-As(2) bond length is 1.19 Å. All Na(1)-As(1) bond lengths are 2.81 Å. Hf(1) is bonded in a 11-coordinate geometry to three equivalent Na(1), four equivalent As(1), and four equivalent As(2) atoms. There are three shorter (2.81 Å) and one longer (3.53 Å) Hf(1)-As(1) bond length. There are three shorter (2.81 Å) and one longer (3.53 Å) Hf(1)-As(2) bond length. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 6-coordinate geometry to three equivalent Na(1) and four equivalent Hf(1) atoms. In the second As site, As(2) is bonded in a single-bond geometry to one Na(1) and four equivalent Hf(1) atoms.