data_TcAs
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.93
_cell_length_b   2.93
_cell_length_c   7.96
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   TcAs
_chemical_formula_sum   'Tc2 As2'
_cell_volume   68.38
_cell_formula_units_Z   2
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
  Tc  Tc2  1  0.47  0.0  0.86  1.0
  Tc  Tc3  1  0.0  0.47  0.1  1.0
  As  As0  1  0.47  0.0  0.45  1.0
  As  As1  1  0.0  0.47  0.52  1.0

data_TcAs
_symmetry_space_group_name_H-M   C2/m
_cell_length_a   4.14
_cell_length_b   4.14
_cell_length_c   7.96
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   12
_chemical_formula_structural   TcAs
_chemical_formula_sum   'Tc4 As4'
_cell_volume   136.76
_cell_formula_units_Z   4
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-x, -y, -z'
  3  '-x, y, -z'
  4  'x, -y, z'
  5  'x+1/2, y+1/2, z'
  6  '-x+1/2, -y+1/2, -z'
  7  '-x+1/2, y+1/2, -z'
  8  'x+1/2, -y+1/2, 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
  Tc  Tc0  4  0.23  0.5  0.38  1.0
  As  As1  4  0.23  0.5  0.96  1.0

Tc Tc As As
Tc Tc As As 0 1 o - + 0 1 o o + 0 1 + - + 0 1 + o + 0 3 o o o 0 0 + o o 0 0 o + o 0 2 o o o 1 1 + o o 1 1 o + o 1 2 o o o 1 3 o o o 2 3 o - o 2 3 o o o 2 3 + - o 2 3 + o o 
AsTc crystallizes in the monoclinic C2/m space group. Tc(1) is bonded in a 10-coordinate geometry to eight equivalent Tc(1) and two equivalent As(1) atoms. There are a spread of Tc(1)-Tc(1) bond distances ranging from 2.67-2.93 Å. There is one shorter (3.33 Å) and one longer (3.38 Å) Tc(1)-As(1) bond length. As(1) is bonded in a 4-coordinate geometry to two equivalent Tc(1) and four equivalent As(1) atoms. There are a spread of As(1)-As(1) bond distances ranging from 2.01-2.29 Å.