The material structure described by K3Cu is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. K(1) is bonded to eight equivalent K(1) and four equivalent Cu(1) atoms to form distorted KK8Cu4 cuboctahedra that share corners with twelve equivalent K(1)K8Cu4 cuboctahedra, edges with eight equivalent Cu(1)K12 cuboctahedra, edges with sixteen equivalent K(1)K8Cu4 cuboctahedra, faces with four equivalent Cu(1)K12 cuboctahedra, and faces with fourteen equivalent K(1)K8Cu4 cuboctahedra. Cu(1) is bonded to twelve equivalent K(1) atoms to form distorted CuK12 cuboctahedra that share corners with twelve equivalent Cu(1)K12 cuboctahedra, edges with twenty-four equivalent K(1)K8Cu4 cuboctahedra, faces with six equivalent Cu(1)K12 cuboctahedra, and faces with twelve equivalent K(1)K8Cu4 cuboctahedra. is represented by the CIF file [CIF]
data_K3Cu
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.813
_cell_length_b   5.813
_cell_length_c   5.813
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   196.450
_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  K0  1  0.500  0.000  0.500  1.0
  K  K1  1  0.500  0.500  0.000  1.0
  K  K2  1  0.000  0.500  0.500  1.0
  Cu  Cu3  1  0.000  0.000  0.000  1.0
[/CIF]
.
The material structure described by K3Cu is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. K(1) is bonded to eight equivalent K(1) and four equivalent Cu(1) atoms to form distorted KK8Cu4 cuboctahedra that share corners with twelve equivalent K(1)K8Cu4 cuboctahedra, edges with eight equivalent Cu(1)K12 cuboctahedra, edges with sixteen equivalent K(1)K8Cu4 cuboctahedra, faces with four equivalent Cu(1)K12 cuboctahedra, and faces with fourteen equivalent K(1)K8Cu4 cuboctahedra. Cu(1) is bonded to twelve equivalent K(1) atoms to form distorted CuK12 cuboctahedra that share corners with twelve equivalent Cu(1)K12 cuboctahedra, edges with twenty-four equivalent K(1)K8Cu4 cuboctahedra, faces with six equivalent Cu(1)K12 cuboctahedra, and faces with twelve equivalent K(1)K8Cu4 cuboctahedra. is represented by the CIF file [CIF]
data_K3Cu
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.813
_cell_length_b   5.813
_cell_length_c   5.813
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   196.450
_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  K0  1  0.500  0.000  0.500  1.0
  K  K1  1  0.500  0.500  0.000  1.0
  K  K2  1  0.000  0.500  0.500  1.0
  Cu  Cu3  1  0.000  0.000  0.000  1.0
[/CIF]
.