The compound described by K3Tb is Uranium Silicide-like structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent K sites. In the first K site, K(1) is bonded to four equivalent K(1), four equivalent K(2), and four equivalent Tb(1) atoms to form KK8Tb4 cuboctahedra that share corners with twelve equivalent K(1)K8Tb4 cuboctahedra, edges with eight equivalent K(1)K8Tb4 cuboctahedra, edges with eight equivalent Tb(1)K12 cuboctahedra, faces with four equivalent Tb(1)K12 cuboctahedra, and faces with ten equivalent K(1)K8Tb4 cuboctahedra. In the second K site, K(2) is bonded in a distorted square co-planar geometry to eight equivalent K(1) and four equivalent Tb(1) atoms. Tb(1) is bonded to four equivalent K(2) and eight equivalent K(1) atoms to form TbK12 cuboctahedra that share corners with four equivalent Tb(1)K12 cuboctahedra, edges with eight equivalent Tb(1)K12 cuboctahedra, edges with sixteen equivalent K(1)K8Tb4 cuboctahedra, faces with four equivalent Tb(1)K12 cuboctahedra, and faces with eight equivalent K(1)K8Tb4 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_K3Tb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.836
_cell_length_b   7.836
_cell_length_c   7.836
_cell_angle_alpha   136.471
_cell_angle_beta   136.471
_cell_angle_gamma   63.253
_symmetry_Int_Tables_number   1
_cell_volume   225.274
_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  0.750  0.250  0.500  1.0
  K  K1  1  0.250  0.750  0.500  1.0
  K  K2  1  0.500  0.500  0.000  1.0
  Tb  Tb3  1  0.000  0.000  0.000  1.0
[/CIF]
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The compound described by K3Tb is Uranium Silicide-like structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent K sites. In the first K site, K(1) is bonded to four equivalent K(1), four equivalent K(2), and four equivalent Tb(1) atoms to form KK8Tb4 cuboctahedra that share corners with twelve equivalent K(1)K8Tb4 cuboctahedra, edges with eight equivalent K(1)K8Tb4 cuboctahedra, edges with eight equivalent Tb(1)K12 cuboctahedra, faces with four equivalent Tb(1)K12 cuboctahedra, and faces with ten equivalent K(1)K8Tb4 cuboctahedra. In the second K site, K(2) is bonded in a distorted square co-planar geometry to eight equivalent K(1) and four equivalent Tb(1) atoms. Tb(1) is bonded to four equivalent K(2) and eight equivalent K(1) atoms to form TbK12 cuboctahedra that share corners with four equivalent Tb(1)K12 cuboctahedra, edges with eight equivalent Tb(1)K12 cuboctahedra, edges with sixteen equivalent K(1)K8Tb4 cuboctahedra, faces with four equivalent Tb(1)K12 cuboctahedra, and faces with eight equivalent K(1)K8Tb4 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_K3Tb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.836
_cell_length_b   7.836
_cell_length_c   7.836
_cell_angle_alpha   136.471
_cell_angle_beta   136.471
_cell_angle_gamma   63.253
_symmetry_Int_Tables_number   1
_cell_volume   225.274
_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  0.750  0.250  0.500  1.0
  K  K1  1  0.250  0.750  0.500  1.0
  K  K2  1  0.500  0.500  0.000  1.0
  Tb  Tb3  1  0.000  0.000  0.000  1.0
[/CIF]
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