data_SrCr3Tc
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.8
_cell_length_b   4.8
_cell_length_c   4.8
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SrCr3Tc
_chemical_formula_sum   'Sr1 Cr3 Tc1'
_cell_volume   110.59
_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
  Sr  Sr0  1  0.0  0.0  0.0  1.0
  Cr  Cr2  1  0.4  0.0  0.4  1.0
  Cr  Cr3  1  0.4  0.4  0.0  1.0
  Cr  Cr4  1  0.0  0.4  0.4  1.0
  Tc  Tc1  1  0.4  0.4  0.4  1.0

data_SrCr3Tc
_symmetry_space_group_name_H-M   R3m
_cell_length_a   6.79
_cell_length_b   6.79
_cell_length_c   8.31
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   SrCr3Tc
_chemical_formula_sum   'Sr3 Cr9 Tc3'
_cell_volume   331.76
_cell_formula_units_Z   3
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  '-y, -x, z'
  5  '-x+y, y, z'
  6  'x, x-y, z'
  7  'x+1/3, y+2/3, z+2/3'
  8  '-y+1/3, x-y+2/3, z+2/3'
  9  '-x+y+1/3, -x+2/3, z+2/3'
  10  '-y+1/3, -x+2/3, z+2/3'
  11  '-x+y+1/3, y+2/3, z+2/3'
  12  'x+1/3, x-y+2/3, z+2/3'
  13  'x+2/3, y+1/3, z+1/3'
  14  '-y+2/3, x-y+1/3, z+1/3'
  15  '-x+y+2/3, -x+1/3, z+1/3'
  16  '-y+2/3, -x+1/3, z+1/3'
  17  '-x+y+2/3, y+1/3, z+1/3'
  18  'x+2/3, x-y+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
  Sr  Sr0  3  0.0  0.0  0.0  1.0
  Cr  Cr1  9  0.07  0.53  0.93  1.0
  Tc  Tc2  3  0.0  0.0  0.4  1.0

Sr Cr Cr Cr Tc
Sr Cr Cr Cr Tc 0 4 o o o 0 3 o o o 0 2 o o o 0 1 o o o 1 4 o o o 2 4 o o o 3 4 o o o 
SrCr3Tc crystallizes in the trigonal R3m space group. Sr(1) is bonded in a 9-coordinate geometry to nine equivalent Cr(1) atoms. There are three shorter (2.72 Å) and six longer (3.46 Å) Sr(1)-Cr(1) bond lengths. Cr(1) is bonded in a 1-coordinate geometry to three equivalent Sr(1) and two equivalent Tc(1) atoms. There is one shorter (1.92 Å) and one longer (2.88 Å) Cr(1)-Tc(1) bond length. Tc(1) is bonded to six equivalent Cr(1) atoms to form distorted corner-sharing TcCr6 octahedra. The corner-sharing octahedra are not tilted.