data_KFe2Ru
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.46
_cell_length_b   3.46
_cell_length_c   6.41
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   KFe2Ru
_chemical_formula_sum   'K1 Fe2 Ru1'
_cell_volume   76.69
_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
  K  K2  1  0.0  0.0  0.19  1.0
  Fe  Fe0  1  0.0  0.0  0.02  1.0
  Fe  Fe1  1  0.73  0.73  0.67  1.0
  Ru  Ru3  1  0.73  0.73  0.72  1.0

data_KFe2Ru
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.89
_cell_length_b   4.89
_cell_length_c   6.41
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   KFe2Ru
_chemical_formula_sum   'K2 Fe4 Ru2'
_cell_volume   153.38
_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
  K  K0  2  0.0  0.0  0.19  1.0
  Fe  Fe1  2  0.0  0.0  0.02  1.0
  Fe  Fe2  2  0.23  0.5  0.67  1.0
  Ru  Ru3  2  0.23  0.5  0.72  1.0

K Fe Fe Ru
K Fe Fe Ru 0 1 o o o 2 3 o o o 
KFeFeRu is High Pressure Cadmuum Telluride structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two iron--ruthenium (1/1) molecules and two iron;potassium molecules.