data_Al2CoTc
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.91
_cell_length_b   2.91
_cell_length_c   6.13
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Al2CoTc
_chemical_formula_sum   'Al2 Co1 Tc1'
_cell_volume   51.87
_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
  Al  Al0  1  0.45  0.45  0.72  1.0
  Al  Al1  1  0.45  0.45  0.41  1.0
  Co  Co2  1  0.0  0.0  0.0  1.0
  Tc  Tc3  1  0.0  0.0  0.06  1.0

data_Al2CoTc
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.11
_cell_length_b   4.11
_cell_length_c   6.13
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Al2CoTc
_chemical_formula_sum   'Al4 Co2 Tc2'
_cell_volume   103.73
_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
  Al  Al0  2  0.45  0.0  0.41  1.0
  Al  Al1  2  0.45  0.0  0.72  1.0
  Co  Co2  2  0.0  0.0  0.0  1.0
  Tc  Tc3  2  0.0  0.0  0.06  1.0

Al Al Co Tc
Al Al Co Tc 0 1 o o o 2 3 o o o 
TcCoAl2 crystallizes in the monoclinic Cm space group. Tc(1) is bonded in a single-bond geometry to one Co(1) and four equivalent Al(2) atoms. The Tc(1)-Co(1) bond length is 0.40 Å. There are a spread of Tc(1)-Al(2) bond distances ranging from 2.82-3.08 Å. Co(1) is bonded in a single-bond geometry to one Tc(1) and four equivalent Al(1) atoms. There are a spread of Co(1)-Al(1) bond distances ranging from 2.53-2.82 Å. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 9-coordinate geometry to four equivalent Co(1), one Al(2), and four equivalent Al(1) atoms. The Al(1)-Al(2) bond length is 1.91 Å. All Al(1)-Al(1) bond lengths are 2.91 Å. In the second Al site, Al(2) is bonded in a 9-coordinate geometry to four equivalent Tc(1), one Al(1), and four equivalent Al(2) atoms. All Al(2)-Al(2) bond lengths are 2.91 Å.