The structure described by U4Tc7Ge6 crystallizes in the trigonal R-3m space group. There are two inequivalent U sites. In the first U site, U(1) is bonded to six equivalent Tc(1) and six equivalent Ge(1) atoms to form UTc6Ge6 cuboctahedra that share corners with four equivalent U(2)Tc6Ge6 cuboctahedra, corners with eight equivalent U(1)Tc6Ge6 cuboctahedra, corners with twelve equivalent Tc(1)U4Ge4 cuboctahedra, edges with six equivalent Tc(1)U4Ge4 cuboctahedra, faces with two equivalent U(2)Tc6Ge6 cuboctahedra, faces with four equivalent U(1)Tc6Ge6 cuboctahedra, and faces with two equivalent Tc(2)Ge6 octahedra. In the second U site, U(2) is bonded to six equivalent Tc(1) and six equivalent Ge(1) atoms to form UTc6Ge6 cuboctahedra that share corners with twelve equivalent U(1)Tc6Ge6 cuboctahedra, corners with twelve equivalent Tc(1)U4Ge4 cuboctahedra, edges with six equivalent Tc(1)U4Ge4 cuboctahedra, faces with six equivalent U(1)Tc6Ge6 cuboctahedra, and faces with two equivalent Tc(2)Ge6 octahedra. There are two inequivalent Tc sites. In the first Tc site, Tc(1) is bonded to one U(2), three equivalent U(1), and four equivalent Ge(1) atoms to form distorted TcU4Ge4 cuboctahedra that share corners with two equivalent U(2)Tc6Ge6 cuboctahedra, corners with six equivalent U(1)Tc6Ge6 cuboctahedra, corners with twelve equivalent Tc(1)U4Ge4 cuboctahedra, corners with four equivalent Tc(2)Ge6 octahedra,  an edgeedge with one U(2)Tc6Ge6 cuboctahedra, edges with two equivalent Tc(1)U4Ge4 cuboctahedra, edges with three equivalent U(1)Tc6Ge6 cuboctahedra, and faces with four equivalent Tc(1)U4Ge4 cuboctahedra. The corner-sharing octahedral tilt angles are 53°. In the second Tc site, Tc(2) is bonded to six equivalent Ge(1) atoms to form TcGe6 octahedra that share corners with twenty-four equivalent Tc(1)U4Ge4 cuboctahedra, faces with two equivalent U(2)Tc6Ge6 cuboctahedra, and faces with six equivalent U(1)Tc6Ge6 cuboctahedra. Ge(1) is bonded in a 9-coordinate geometry to one U(2), three equivalent U(1), one Tc(2), and four equivalent Tc(1) atoms. is represented by the CIF card [CIF]
data_U4Tc7Ge6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.210
_cell_length_b   7.210
_cell_length_c   7.193
_cell_angle_alpha   109.425
_cell_angle_beta   109.425
_cell_angle_gamma   109.518
_symmetry_Int_Tables_number   1
_cell_volume   287.974
_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
  U  U0  1  0.500  0.500  0.500  1.0
  U  U1  1  0.000  0.000  0.500  1.0
  U  U2  1  0.500  0.000  0.000  1.0
  U  U3  1  0.000  0.500  0.000  1.0
  Tc  Tc4  1  0.750  0.250  0.500  1.0
  Tc  Tc5  1  0.500  0.250  0.750  1.0
  Tc  Tc6  1  0.500  0.750  0.250  1.0
  Tc  Tc7  1  0.250  0.500  0.750  1.0
  Tc  Tc8  1  0.750  0.500  0.250  1.0
  Tc  Tc9  1  0.250  0.750  0.500  1.0
  Tc  Tc10  1  0.000  0.000  0.000  1.0
  Ge  Ge11  1  0.310  0.310  0.000  1.0
  Ge  Ge12  1  0.000  0.310  0.309  1.0
  Ge  Ge13  1  1.000  0.690  0.691  1.0
  Ge  Ge14  1  0.690  1.000  0.691  1.0
  Ge  Ge15  1  0.310  0.000  0.309  1.0
  Ge  Ge16  1  0.690  0.690  1.000  1.0
[/CIF]
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The structure described by U4Tc7Ge6 crystallizes in the trigonal R-3m space group. There are two inequivalent U sites. In the first U site, U(1) is bonded to six equivalent Tc(1) and six equivalent Ge(1) atoms to form UTc6Ge6 cuboctahedra that share corners with four equivalent U(2)Tc6Ge6 cuboctahedra, corners with eight equivalent U(1)Tc6Ge6 cuboctahedra, corners with twelve equivalent Tc(1)U4Ge4 cuboctahedra, edges with six equivalent Tc(1)U4Ge4 cuboctahedra, faces with two equivalent U(2)Tc6Ge6 cuboctahedra, faces with four equivalent U(1)Tc6Ge6 cuboctahedra, and faces with two equivalent Tc(2)Ge6 octahedra. In the second U site, U(2) is bonded to six equivalent Tc(1) and six equivalent Ge(1) atoms to form UTc6Ge6 cuboctahedra that share corners with twelve equivalent U(1)Tc6Ge6 cuboctahedra, corners with twelve equivalent Tc(1)U4Ge4 cuboctahedra, edges with six equivalent Tc(1)U4Ge4 cuboctahedra, faces with six equivalent U(1)Tc6Ge6 cuboctahedra, and faces with two equivalent Tc(2)Ge6 octahedra. There are two inequivalent Tc sites. In the first Tc site, Tc(1) is bonded to one U(2), three equivalent U(1), and four equivalent Ge(1) atoms to form distorted TcU4Ge4 cuboctahedra that share corners with two equivalent U(2)Tc6Ge6 cuboctahedra, corners with six equivalent U(1)Tc6Ge6 cuboctahedra, corners with twelve equivalent Tc(1)U4Ge4 cuboctahedra, corners with four equivalent Tc(2)Ge6 octahedra,  an edgeedge with one U(2)Tc6Ge6 cuboctahedra, edges with two equivalent Tc(1)U4Ge4 cuboctahedra, edges with three equivalent U(1)Tc6Ge6 cuboctahedra, and faces with four equivalent Tc(1)U4Ge4 cuboctahedra. The corner-sharing octahedral tilt angles are 53°. In the second Tc site, Tc(2) is bonded to six equivalent Ge(1) atoms to form TcGe6 octahedra that share corners with twenty-four equivalent Tc(1)U4Ge4 cuboctahedra, faces with two equivalent U(2)Tc6Ge6 cuboctahedra, and faces with six equivalent U(1)Tc6Ge6 cuboctahedra. Ge(1) is bonded in a 9-coordinate geometry to one U(2), three equivalent U(1), one Tc(2), and four equivalent Tc(1) atoms. is represented by the CIF card [CIF]
data_U4Tc7Ge6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.210
_cell_length_b   7.210
_cell_length_c   7.193
_cell_angle_alpha   109.425
_cell_angle_beta   109.425
_cell_angle_gamma   109.518
_symmetry_Int_Tables_number   1
_cell_volume   287.974
_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
  U  U0  1  0.500  0.500  0.500  1.0
  U  U1  1  0.000  0.000  0.500  1.0
  U  U2  1  0.500  0.000  0.000  1.0
  U  U3  1  0.000  0.500  0.000  1.0
  Tc  Tc4  1  0.750  0.250  0.500  1.0
  Tc  Tc5  1  0.500  0.250  0.750  1.0
  Tc  Tc6  1  0.500  0.750  0.250  1.0
  Tc  Tc7  1  0.250  0.500  0.750  1.0
  Tc  Tc8  1  0.750  0.500  0.250  1.0
  Tc  Tc9  1  0.250  0.750  0.500  1.0
  Tc  Tc10  1  0.000  0.000  0.000  1.0
  Ge  Ge11  1  0.310  0.310  0.000  1.0
  Ge  Ge12  1  0.000  0.310  0.309  1.0
  Ge  Ge13  1  1.000  0.690  0.691  1.0
  Ge  Ge14  1  0.690  1.000  0.691  1.0
  Ge  Ge15  1  0.310  0.000  0.309  1.0
  Ge  Ge16  1  0.690  0.690  1.000  1.0
[/CIF]
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