data_LaSi2Tc
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.24
_cell_length_b   3.24
_cell_length_c   6.9
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   LaSi2Tc
_chemical_formula_sum   'La1 Si2 Tc1'
_cell_volume   72.37
_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
  La  La0  1  0.0  0.0  0.45  1.0
  Si  Si1  1  0.62  0.62  0.61  1.0
  Si  Si2  1  0.62  0.62  0.29  1.0
  Tc  Tc3  1  0.0  0.0  0.0  1.0

data_LaSi2Tc
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.58
_cell_length_b   4.58
_cell_length_c   6.9
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   LaSi2Tc
_chemical_formula_sum   'La2 Si4 Tc2'
_cell_volume   144.74
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  '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
  La  La0  2  0.0  0.0  0.45  1.0
  Tc  Tc1  2  0.0  0.0  0.0  1.0
  Si  Si2  2  0.12  0.5  0.29  1.0
  Si  Si3  2  0.12  0.5  0.61  1.0

La Si Si Tc
LaTcSi2 crystallizes in the monoclinic Cm space group. La(1) is bonded in a 2-coordinate geometry to one Tc(1), one Si(1), and one Si(2) atom. The La(1)-Tc(1) bond length is 3.10 Å. The La(1)-Si(1) bond length is 2.08 Å. The La(1)-Si(2) bond length is 2.08 Å. Tc(1) is bonded in a 9-coordinate geometry to one La(1), four equivalent Tc(1), one Si(1), and three equivalent Si(2) atoms. All Tc(1)-Tc(1) bond lengths are 3.24 Å. The Tc(1)-Si(1) bond length is 3.19 Å. There is one shorter (2.63 Å) and two longer (3.07 Å) Tc(1)-Si(2) bond lengths. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 1-coordinate geometry to one La(1) and one Tc(1) atom. In the second Si site, Si(2) is bonded in a 1-coordinate geometry to one La(1) and three equivalent Tc(1) atoms.