The material described by U2Fe15Ge2 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 18-coordinate geometry to two equivalent Fe(3), two equivalent Fe(4), two equivalent Fe(5), four equivalent Fe(7), and eight equivalent Fe(6) atoms. In the second U site, U(2) is bonded to two equivalent Fe(2), two equivalent Fe(3), two equivalent Fe(4), two equivalent Fe(5), two equivalent Fe(7), four equivalent Fe(1), four equivalent Fe(6), and two equivalent Ge(1) atoms to form distorted UFe18Ge2 hexagonal bipyramids that share corners with six equivalent U(2)Fe18Ge2 hexagonal bipyramids, faces with two equivalent Fe(2)U2Fe8Ge2 cuboctahedra, faces with four equivalent Fe(1)U2Fe8Ge2 cuboctahedra, faces with six equivalent Fe(7)U3Fe8Ge cuboctahedra, and faces with twelve equivalent Fe(6)U3Fe8Ge cuboctahedra. There are seven inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent U(2), two equivalent Fe(3), two equivalent Fe(5), two equivalent Fe(6), two equivalent Fe(7), and two equivalent Ge(1) atoms to form distorted FeU2Fe8Ge2 cuboctahedra that share corners with two equivalent Fe(1)U2Fe8Ge2 cuboctahedra, corners with two equivalent Fe(2)U2Fe8Ge2 cuboctahedra, corners with two equivalent Fe(7)U3Fe8Ge cuboctahedra, corners with eight equivalent Fe(6)U3Fe8Ge cuboctahedra, edges with two equivalent Fe(7)U3Fe8Ge cuboctahedra, edges with four equivalent Fe(6)U3Fe8Ge cuboctahedra, faces with two equivalent Fe(2)U2Fe8Ge2 cuboctahedra, faces with two equivalent Fe(6)U3Fe8Ge cuboctahedra, faces with two equivalent Fe(7)U3Fe8Ge cuboctahedra, faces with four equivalent Fe(1)U2Fe8Ge2 cuboctahedra, and faces with two equivalent U(2)Fe18Ge2 hexagonal bipyramids. In the second Fe site, Fe(2) is bonded to two equivalent U(2), four equivalent Fe(4), four equivalent Fe(6), and two equivalent Ge(1) atoms to form distorted FeU2Fe8Ge2 cuboctahedra that share corners with four equivalent Fe(1)U2Fe8Ge2 cuboctahedra, corners with four equivalent Fe(6)U3Fe8Ge cuboctahedra, corners with six equivalent Fe(7)U3Fe8Ge cuboctahedra, edges with two equivalent Fe(7)U3Fe8Ge cuboctahedra, edges with four equivalent Fe(6)U3Fe8Ge cuboctahedra, faces with two equivalent Fe(2)U2Fe8Ge2 cuboctahedra, faces with four equivalent Fe(1)U2Fe8Ge2 cuboctahedra, faces with four equivalent Fe(6)U3Fe8Ge cuboctahedra, and faces with two equivalent U(2)Fe18Ge2 hexagonal bipyramids. In the third Fe site, Fe(3) is bonded in a 12-coordinate geometry to one U(1), one U(2), one Fe(3), one Fe(5), two equivalent Fe(1), two equivalent Fe(6), two equivalent Fe(7), and two equivalent Ge(1) atoms. In the fourth Fe site, Fe(4) is bonded in a 12-coordinate geometry to one U(1), one U(2), one Fe(4), one Fe(5), two equivalent Fe(2), four equivalent Fe(6), and two equivalent Ge(1) atoms. In the fifth Fe site, Fe(5) is bonded in a 12-coordinate geometry to one U(1), one U(2), one Fe(3), one Fe(4), two equivalent Fe(1), two equivalent Fe(6), two equivalent Fe(7), and two equivalent Ge(1) atoms. In the sixth Fe site, Fe(6) is bonded to one U(2), two equivalent U(1), one Fe(1), one Fe(2), one Fe(3), one Fe(5), one Fe(6), one Fe(7), two equivalent Fe(4), and one Ge(1) atom to form distorted FeU3Fe8Ge cuboctahedra that share  a cornercorner with one Fe(2)U2Fe8Ge2 cuboctahedra, corners with three equivalent Fe(7)U3Fe8Ge cuboctahedra, corners with four equivalent Fe(1)U2Fe8Ge2 cuboctahedra, corners with seven equivalent Fe(6)U3Fe8Ge cuboctahedra,  an edgeedge with one Fe(2)U2Fe8Ge2 cuboctahedra, edges with two equivalent Fe(1)U2Fe8Ge2 cuboctahedra, edges with two equivalent Fe(7)U3Fe8Ge cuboctahedra, edges with three equivalent Fe(6)U3Fe8Ge cuboctahedra,  a faceface with one Fe(1)U2Fe8Ge2 cuboctahedra,  a faceface with one Fe(2)U2Fe8Ge2 cuboctahedra, faces with three equivalent Fe(7)U3Fe8Ge cuboctahedra, faces with five equivalent Fe(6)U3Fe8Ge cuboctahedra, and faces with three equivalent U(2)Fe18Ge2 hexagonal bipyramids. In the seventh Fe site, Fe(7) is bonded to one U(2), two equivalent U(1), two equivalent Fe(1), two equivalent Fe(3), two equivalent Fe(5), two equivalent Fe(6), and one Ge(1) atom to form distorted FeU3Fe8Ge cuboctahedra that share corners with two equivalent Fe(1)U2Fe8Ge2 cuboctahedra, corners with three equivalent Fe(2)U2Fe8Ge2 cuboctahedra, corners with four equivalent Fe(7)U3Fe8Ge cuboctahedra, corners with six equivalent Fe(6)U3Fe8Ge cuboctahedra,  an edgeedge with one Fe(2)U2Fe8Ge2 cuboctahedra,  an edgeedge with one Fe(7)U3Fe8Ge cuboctahedra, edges with two equivalent Fe(1)U2Fe8Ge2 cuboctahedra, edges with four equivalent Fe(6)U3Fe8Ge cuboctahedra, faces with two equivalent Fe(1)U2Fe8Ge2 cuboctahedra, faces with two equivalent Fe(7)U3Fe8Ge cuboctahedra, faces with six equivalent Fe(6)U3Fe8Ge cuboctahedra, and faces with three equivalent U(2)Fe18Ge2 hexagonal bipyramids. Ge(1) is bonded in a 14-coordinate geometry to one U(2), one Fe(2), one Fe(7), two equivalent Fe(1), two equivalent Fe(3), two equivalent Fe(4), two equivalent Fe(5), two equivalent Fe(6), and one Ge(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_U2Fe15Ge2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.540
_cell_length_b   8.352
_cell_length_c   8.352
_cell_angle_alpha   120.160
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   515.077
_cell_formula_units_Z   2
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  0.750  1.000  0.000  1.0
  U  U1  1  0.250  0.000  1.000  1.0
  U  U2  1  0.250  0.667  0.333  1.0
  U  U3  1  0.750  0.333  0.667  1.0
  Fe  Fe4  1  0.500  0.500  0.000  1.0
  Fe  Fe5  1  0.500  0.500  0.500  1.0
  Fe  Fe6  1  0.500  0.000  0.500  1.0
  Fe  Fe7  1  0.000  0.500  0.000  1.0
  Fe  Fe8  1  0.000  0.500  0.500  1.0
  Fe  Fe9  1  0.000  0.000  0.500  1.0
  Fe  Fe10  1  0.750  0.668  0.022  1.0
  Fe  Fe11  1  0.750  0.353  0.332  1.0
  Fe  Fe12  1  0.750  0.979  0.647  1.0
  Fe  Fe13  1  0.750  0.353  0.021  1.0
  Fe  Fe14  1  0.750  0.978  0.332  1.0
  Fe  Fe15  1  0.750  0.668  0.647  1.0
  Fe  Fe16  1  0.250  0.332  0.978  1.0
  Fe  Fe17  1  0.250  0.647  0.668  1.0
  Fe  Fe18  1  0.250  0.021  0.353  1.0
  Fe  Fe19  1  0.250  0.647  0.979  1.0
  Fe  Fe20  1  0.250  0.022  0.668  1.0
  Fe  Fe21  1  0.250  0.332  0.353  1.0
  Fe  Fe22  1  0.490  0.836  0.672  1.0
  Fe  Fe23  1  0.490  0.836  0.164  1.0
  Fe  Fe24  1  0.490  0.328  0.164  1.0
  Fe  Fe25  1  0.510  0.164  0.328  1.0
  Fe  Fe26  1  0.510  0.164  0.836  1.0
  Fe  Fe27  1  0.510  0.672  0.836  1.0
  Fe  Fe28  1  0.990  0.164  0.328  1.0
  Fe  Fe29  1  0.990  0.164  0.836  1.0
  Fe  Fe30  1  0.990  0.672  0.836  1.0
  Fe  Fe31  1  0.010  0.836  0.672  1.0
  Fe  Fe32  1  0.010  0.836  0.164  1.0
  Fe  Fe33  1  0.010  0.328  0.164  1.0
  Ge  Ge34  1  0.600  0.667  0.333  1.0
  Ge  Ge35  1  0.400  0.333  0.667  1.0
  Ge  Ge36  1  0.100  0.333  0.667  1.0
  Ge  Ge37  1  0.900  0.667  0.333  1.0
[/CIF]
.
The material described by U2Fe15Ge2 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 18-coordinate geometry to two equivalent Fe(3), two equivalent Fe(4), two equivalent Fe(5), four equivalent Fe(7), and eight equivalent Fe(6) atoms. In the second U site, U(2) is bonded to two equivalent Fe(2), two equivalent Fe(3), two equivalent Fe(4), two equivalent Fe(5), two equivalent Fe(7), four equivalent Fe(1), four equivalent Fe(6), and two equivalent Ge(1) atoms to form distorted UFe18Ge2 hexagonal bipyramids that share corners with six equivalent U(2)Fe18Ge2 hexagonal bipyramids, faces with two equivalent Fe(2)U2Fe8Ge2 cuboctahedra, faces with four equivalent Fe(1)U2Fe8Ge2 cuboctahedra, faces with six equivalent Fe(7)U3Fe8Ge cuboctahedra, and faces with twelve equivalent Fe(6)U3Fe8Ge cuboctahedra. There are seven inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent U(2), two equivalent Fe(3), two equivalent Fe(5), two equivalent Fe(6), two equivalent Fe(7), and two equivalent Ge(1) atoms to form distorted FeU2Fe8Ge2 cuboctahedra that share corners with two equivalent Fe(1)U2Fe8Ge2 cuboctahedra, corners with two equivalent Fe(2)U2Fe8Ge2 cuboctahedra, corners with two equivalent Fe(7)U3Fe8Ge cuboctahedra, corners with eight equivalent Fe(6)U3Fe8Ge cuboctahedra, edges with two equivalent Fe(7)U3Fe8Ge cuboctahedra, edges with four equivalent Fe(6)U3Fe8Ge cuboctahedra, faces with two equivalent Fe(2)U2Fe8Ge2 cuboctahedra, faces with two equivalent Fe(6)U3Fe8Ge cuboctahedra, faces with two equivalent Fe(7)U3Fe8Ge cuboctahedra, faces with four equivalent Fe(1)U2Fe8Ge2 cuboctahedra, and faces with two equivalent U(2)Fe18Ge2 hexagonal bipyramids. In the second Fe site, Fe(2) is bonded to two equivalent U(2), four equivalent Fe(4), four equivalent Fe(6), and two equivalent Ge(1) atoms to form distorted FeU2Fe8Ge2 cuboctahedra that share corners with four equivalent Fe(1)U2Fe8Ge2 cuboctahedra, corners with four equivalent Fe(6)U3Fe8Ge cuboctahedra, corners with six equivalent Fe(7)U3Fe8Ge cuboctahedra, edges with two equivalent Fe(7)U3Fe8Ge cuboctahedra, edges with four equivalent Fe(6)U3Fe8Ge cuboctahedra, faces with two equivalent Fe(2)U2Fe8Ge2 cuboctahedra, faces with four equivalent Fe(1)U2Fe8Ge2 cuboctahedra, faces with four equivalent Fe(6)U3Fe8Ge cuboctahedra, and faces with two equivalent U(2)Fe18Ge2 hexagonal bipyramids. In the third Fe site, Fe(3) is bonded in a 12-coordinate geometry to one U(1), one U(2), one Fe(3), one Fe(5), two equivalent Fe(1), two equivalent Fe(6), two equivalent Fe(7), and two equivalent Ge(1) atoms. In the fourth Fe site, Fe(4) is bonded in a 12-coordinate geometry to one U(1), one U(2), one Fe(4), one Fe(5), two equivalent Fe(2), four equivalent Fe(6), and two equivalent Ge(1) atoms. In the fifth Fe site, Fe(5) is bonded in a 12-coordinate geometry to one U(1), one U(2), one Fe(3), one Fe(4), two equivalent Fe(1), two equivalent Fe(6), two equivalent Fe(7), and two equivalent Ge(1) atoms. In the sixth Fe site, Fe(6) is bonded to one U(2), two equivalent U(1), one Fe(1), one Fe(2), one Fe(3), one Fe(5), one Fe(6), one Fe(7), two equivalent Fe(4), and one Ge(1) atom to form distorted FeU3Fe8Ge cuboctahedra that share  a cornercorner with one Fe(2)U2Fe8Ge2 cuboctahedra, corners with three equivalent Fe(7)U3Fe8Ge cuboctahedra, corners with four equivalent Fe(1)U2Fe8Ge2 cuboctahedra, corners with seven equivalent Fe(6)U3Fe8Ge cuboctahedra,  an edgeedge with one Fe(2)U2Fe8Ge2 cuboctahedra, edges with two equivalent Fe(1)U2Fe8Ge2 cuboctahedra, edges with two equivalent Fe(7)U3Fe8Ge cuboctahedra, edges with three equivalent Fe(6)U3Fe8Ge cuboctahedra,  a faceface with one Fe(1)U2Fe8Ge2 cuboctahedra,  a faceface with one Fe(2)U2Fe8Ge2 cuboctahedra, faces with three equivalent Fe(7)U3Fe8Ge cuboctahedra, faces with five equivalent Fe(6)U3Fe8Ge cuboctahedra, and faces with three equivalent U(2)Fe18Ge2 hexagonal bipyramids. In the seventh Fe site, Fe(7) is bonded to one U(2), two equivalent U(1), two equivalent Fe(1), two equivalent Fe(3), two equivalent Fe(5), two equivalent Fe(6), and one Ge(1) atom to form distorted FeU3Fe8Ge cuboctahedra that share corners with two equivalent Fe(1)U2Fe8Ge2 cuboctahedra, corners with three equivalent Fe(2)U2Fe8Ge2 cuboctahedra, corners with four equivalent Fe(7)U3Fe8Ge cuboctahedra, corners with six equivalent Fe(6)U3Fe8Ge cuboctahedra,  an edgeedge with one Fe(2)U2Fe8Ge2 cuboctahedra,  an edgeedge with one Fe(7)U3Fe8Ge cuboctahedra, edges with two equivalent Fe(1)U2Fe8Ge2 cuboctahedra, edges with four equivalent Fe(6)U3Fe8Ge cuboctahedra, faces with two equivalent Fe(1)U2Fe8Ge2 cuboctahedra, faces with two equivalent Fe(7)U3Fe8Ge cuboctahedra, faces with six equivalent Fe(6)U3Fe8Ge cuboctahedra, and faces with three equivalent U(2)Fe18Ge2 hexagonal bipyramids. Ge(1) is bonded in a 14-coordinate geometry to one U(2), one Fe(2), one Fe(7), two equivalent Fe(1), two equivalent Fe(3), two equivalent Fe(4), two equivalent Fe(5), two equivalent Fe(6), and one Ge(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_U2Fe15Ge2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.540
_cell_length_b   8.352
_cell_length_c   8.352
_cell_angle_alpha   120.160
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   515.077
_cell_formula_units_Z   2
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  0.750  1.000  0.000  1.0
  U  U1  1  0.250  0.000  1.000  1.0
  U  U2  1  0.250  0.667  0.333  1.0
  U  U3  1  0.750  0.333  0.667  1.0
  Fe  Fe4  1  0.500  0.500  0.000  1.0
  Fe  Fe5  1  0.500  0.500  0.500  1.0
  Fe  Fe6  1  0.500  0.000  0.500  1.0
  Fe  Fe7  1  0.000  0.500  0.000  1.0
  Fe  Fe8  1  0.000  0.500  0.500  1.0
  Fe  Fe9  1  0.000  0.000  0.500  1.0
  Fe  Fe10  1  0.750  0.668  0.022  1.0
  Fe  Fe11  1  0.750  0.353  0.332  1.0
  Fe  Fe12  1  0.750  0.979  0.647  1.0
  Fe  Fe13  1  0.750  0.353  0.021  1.0
  Fe  Fe14  1  0.750  0.978  0.332  1.0
  Fe  Fe15  1  0.750  0.668  0.647  1.0
  Fe  Fe16  1  0.250  0.332  0.978  1.0
  Fe  Fe17  1  0.250  0.647  0.668  1.0
  Fe  Fe18  1  0.250  0.021  0.353  1.0
  Fe  Fe19  1  0.250  0.647  0.979  1.0
  Fe  Fe20  1  0.250  0.022  0.668  1.0
  Fe  Fe21  1  0.250  0.332  0.353  1.0
  Fe  Fe22  1  0.490  0.836  0.672  1.0
  Fe  Fe23  1  0.490  0.836  0.164  1.0
  Fe  Fe24  1  0.490  0.328  0.164  1.0
  Fe  Fe25  1  0.510  0.164  0.328  1.0
  Fe  Fe26  1  0.510  0.164  0.836  1.0
  Fe  Fe27  1  0.510  0.672  0.836  1.0
  Fe  Fe28  1  0.990  0.164  0.328  1.0
  Fe  Fe29  1  0.990  0.164  0.836  1.0
  Fe  Fe30  1  0.990  0.672  0.836  1.0
  Fe  Fe31  1  0.010  0.836  0.672  1.0
  Fe  Fe32  1  0.010  0.836  0.164  1.0
  Fe  Fe33  1  0.010  0.328  0.164  1.0
  Ge  Ge34  1  0.600  0.667  0.333  1.0
  Ge  Ge35  1  0.400  0.333  0.667  1.0
  Ge  Ge36  1  0.100  0.333  0.667  1.0
  Ge  Ge37  1  0.900  0.667  0.333  1.0
[/CIF]
.