data_HfZnSi4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.04
_cell_length_b   5.04
_cell_length_c   5.04
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   HfZnSi4
_chemical_formula_sum   'Hf1 Zn1 Si4'
_cell_volume   90.78
_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  Hf0  1  0.78  0.78  0.78  1.0
  Zn  Zn5  1  0.0  0.0  0.0  1.0
  Si  Si1  1  0.67  0.67  0.46  1.0
  Si  Si2  1  0.67  0.46  0.67  1.0
  Si  Si3  1  0.46  0.67  0.67  1.0
  Si  Si4  1  0.46  0.46  0.46  1.0

data_HfZnSi4
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.04
_cell_length_b   5.04
_cell_length_c   12.36
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   HfZnSi4
_chemical_formula_sum   'Hf3 Zn3 Si12'
_cell_volume   272.34
_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  0.22  1.0
  Zn  Zn1  3  0.0  0.0  0.0  1.0
  Si  Si2  9  0.14  0.07  0.4  1.0
  Si  Si3  3  0.0  0.0  0.54  1.0

Hf Zn Si Si Si Si
Hf Zn Si Si Si Si 0 4 o o o 0 3 o o o 0 2 o o o 0 1 + + + 1 2 - - o 1 3 - o - 1 4 o - - 2 3 o o o 2 4 o o o 2 5 o o o 3 4 o o o 3 5 o o o 4 5 o o o 
HfZnSi4 crystallizes in the trigonal R3m space group. Hf(1) is bonded in a 13-coordinate geometry to four equivalent Zn(1), three equivalent Si(2), and six equivalent Si(1) atoms. There is one shorter (2.67 Å) and three longer (3.25 Å) Hf(1)-Zn(1) bond lengths. All Hf(1)-Si(2) bond lengths are 2.91 Å. There are three shorter (2.32 Å) and three longer (2.96 Å) Hf(1)-Si(1) bond lengths. Zn(1) is bonded in a 4-coordinate geometry to four equivalent Hf(1) and three equivalent Si(1) atoms. All Zn(1)-Si(1) bond lengths are 2.42 Å. There are two inequivalent Si sites. In the first Si site, Si(2) is bonded in a 6-coordinate geometry to three equivalent Hf(1) and three equivalent Si(1) atoms. All Si(2)-Si(1) bond lengths are 1.88 Å. In the second Si site, Si(1) is bonded in a 6-coordinate geometry to two equivalent Hf(1), one Zn(1), one Si(2), and two equivalent Si(1) atoms. Both Si(1)-Si(1) bond lengths are 1.08 Å.