data_SiTc2Sn
_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   143.51
_cell_angle_beta   120.84
_cell_angle_gamma   71.54
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SiTc2Sn
_chemical_formula_sum   'Si1 Tc2 Sn1'
_cell_volume   64.3
_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
  Si  Si0  1  0.0  0.0  0.0  1.0
  Tc  Tc2  1  0.58  0.0  0.79  1.0
  Tc  Tc3  1  0.0  0.49  0.3  1.0
  Sn  Sn1  1  0.0  0.0  0.09  1.0

data_SiTc2Sn
_symmetry_space_group_name_H-M   P1
_cell_length_a   3.16
_cell_length_b   4.98
_cell_length_c   5.04
_cell_angle_alpha   119.58
_cell_angle_beta   108.25
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SiTc2Sn
_chemical_formula_sum   'Si1 Tc2 Sn1'
_cell_volume   64.3
_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
  Si  Si0  1  0.0  0.0  0.0  1.0
  Tc  Tc1  1  0.7  0.19  0.19  1.0
  Tc  Tc2  1  0.79  0.21  0.79  1.0
  Sn  Sn3  1  0.91  0.91  0.91  1.0

Si Tc Tc Sn
Si Tc Tc Sn 0 3 o o o 0 1 - o - 0 2 o o o 1 2 + o + 1 3 + o + 2 3 o o o 
Tc2SnSi crystallizes in the triclinic P1 space group. There are two inequivalent Tc sites. In the first Tc site, Tc(1) is bonded in a 7-coordinate geometry to two equivalent Tc(1), two equivalent Tc(2), two equivalent Sn(1), and one Si(1) atom. Both Tc(1)-Tc(1) bond lengths are 3.16 Å. There is one shorter (2.17 Å) and one longer (2.90 Å) Tc(1)-Tc(2) bond length. There is one shorter (1.88 Å) and one longer (3.22 Å) Tc(1)-Sn(1) bond length. The Tc(1)-Si(1) bond length is 1.82 Å. In the second Tc site, Tc(2) is bonded in a 2-coordinate geometry to two equivalent Tc(1) and two equivalent Si(1) atoms. There is one shorter (1.54 Å) and one longer (2.11 Å) Tc(2)-Si(1) bond length. Sn(1) is bonded in a single-bond geometry to two equivalent Tc(1) and one Si(1) atom. The Sn(1)-Si(1) bond length is 0.46 Å. Si(1) is bonded in a single-bond geometry to one Tc(1), two equivalent Tc(2), and one Sn(1) atom.