data_Co2Tc
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.56
_cell_length_b   5.56
_cell_length_c   5.56
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Co2Tc
_chemical_formula_sum   'Co8 Tc4'
_cell_volume   172.31
_cell_formula_units_Z   4
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
  Co  Co0  1  0.65  0.44  0.91  1.0
  Co  Co1  1  0.65  0.91  0.13  1.0
  Co  Co2  1  0.13  0.65  0.91  1.0
  Co  Co3  1  0.13  0.13  0.13  1.0
  Co  Co4  1  0.44  0.44  0.44  1.0
  Co  Co5  1  0.44  0.91  0.65  1.0
  Co  Co6  1  0.91  0.65  0.44  1.0
  Co  Co7  1  0.91  0.13  0.65  1.0
  Tc  Tc8  1  0.0  0.0  0.0  1.0
  Tc  Tc9  1  0.0  0.78  0.78  1.0
  Tc  Tc10  1  0.78  0.0  0.78  1.0
  Tc  Tc11  1  0.78  0.78  0.0  1.0

data_Co2Tc
_symmetry_space_group_name_H-M   R3
_cell_length_a   7.87
_cell_length_b   7.87
_cell_length_c   9.64
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   146
_chemical_formula_structural   Co2Tc
_chemical_formula_sum   'Co24 Tc12'
_cell_volume   516.93
_cell_formula_units_Z   12
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  'x+1/3, y+2/3, z+2/3'
  5  '-y+1/3, x-y+2/3, z+2/3'
  6  '-x+y+1/3, -x+2/3, z+2/3'
  7  'x+2/3, y+1/3, z+1/3'
  8  '-y+2/3, x-y+1/3, z+1/3'
  9  '-x+y+2/3, -x+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
  Co  Co0  9  0.01  0.25  0.9  1.0
  Co  Co1  9  0.1  0.68  0.33  1.0
  Co  Co2  3  0.0  0.0  0.13  1.0
  Co  Co3  3  0.0  0.0  0.44  1.0
  Tc  Tc4  9  0.15  0.07  0.85  1.0
  Tc  Tc5  3  0.0  0.0  0.0  1.0

Co Co Co Co Co Co Co Co Tc Tc Tc Tc
TcCo2 crystallizes in the trigonal R3 space group. There are two inequivalent Tc sites. In the first Tc site, Tc(1) is bonded in a distorted single-bond geometry to one Co(3) atom. The Tc(1)-Co(3) bond length is 1.25 Å. In the second Tc site, Tc(2) is bonded in a distorted single-bond geometry to one Co(1) and one Co(2) atom. The Tc(2)-Co(1) bond length is 2.12 Å. The Tc(2)-Co(2) bond length is 1.25 Å. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded in a distorted single-bond geometry to one Tc(2) and two equivalent Co(4) atoms. There is one shorter (2.91 Å) and one longer (3.16 Å) Co(1)-Co(4) bond length. In the second Co site, Co(2) is bonded in a single-bond geometry to one Tc(2) atom. In the third Co site, Co(3) is bonded in a single-bond geometry to one Tc(1) and one Co(4) atom. The Co(3)-Co(4) bond length is 2.95 Å. In the fourth Co site, Co(4) is bonded in a 7-coordinate geometry to one Co(3) and six equivalent Co(1) atoms.