data_Zr2TaTc
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.74
_cell_length_b   4.74
_cell_length_c   4.74
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Zr2TaTc
_chemical_formula_sum   'Zr2 Ta1 Tc1'
_cell_volume   75.14
_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
  Zr  Zr2  1  0.02  0.02  0.02  1.0
  Zr  Zr3  1  0.0  0.0  0.0  1.0
  Ta  Ta0  1  0.67  0.67  0.67  1.0
  Tc  Tc1  1  0.35  0.35  0.35  1.0

data_Zr2TaTc
_symmetry_space_group_name_H-M   R3m
_cell_length_a   4.74
_cell_length_b   4.74
_cell_length_c   11.6
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   Zr2TaTc
_chemical_formula_sum   'Zr6 Ta3 Tc3'
_cell_volume   225.43
_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
  Zr  Zr0  3  0.0  0.0  0.0  1.0
  Zr  Zr1  3  0.0  0.0  0.98  1.0
  Ta  Ta2  3  0.0  0.0  0.33  1.0
  Tc  Tc3  3  0.0  0.0  0.65  1.0

Zr Zr Ta Tc
Zr Zr Ta Tc 0 1 o o o 0 2 o - - 0 2 - o - 0 2 - - o 0 3 o o - 0 3 o - o 0 3 - o o 1 2 o - - 1 2 - o - 1 2 - - o 1 3 o o - 1 3 o - o 1 3 - o o 2 3 o o + 2 3 o + o 2 3 + o o 
Zr2TaTc crystallizes in the trigonal R3m space group. There are two inequivalent Zr sites. In the first Zr site, Zr(1) is bonded in a single-bond geometry to one Zr(2), three equivalent Ta(1), and four equivalent Tc(1) atoms. The Zr(1)-Zr(2) bond length is 0.28 Å. All Zr(1)-Ta(1) bond lengths are 2.74 Å. There are three shorter (2.74 Å) and one longer (3.77 Å) Zr(1)-Tc(1) bond length. In the second Zr site, Zr(2) is bonded in a single-bond geometry to one Zr(1), four equivalent Ta(1), and three equivalent Tc(1) atoms. There are three shorter (2.74 Å) and one longer (3.77 Å) Zr(2)-Ta(1) bond length. All Zr(2)-Tc(1) bond lengths are 2.74 Å. Ta(1) is bonded in a distorted trigonal planar geometry to three equivalent Zr(1), four equivalent Zr(2), and four equivalent Tc(1) atoms. There are three shorter (2.74 Å) and one longer (3.77 Å) Ta(1)-Tc(1) bond length. Tc(1) is bonded in a 11-coordinate geometry to three equivalent Zr(2), four equivalent Zr(1), and four equivalent Ta(1) atoms.