The material structure described by U4Sm4O17 is alpha bismuth trifluoride-derived structured and crystallizes in the orthorhombic Cmmm space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a body-centered cubic geometry to one O(5), two equivalent O(1), two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms. In the second U site, U(2) is bonded in a 10-coordinate geometry to two equivalent O(3), two equivalent O(4), two equivalent O(5), and four equivalent O(2) atoms. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(2), and four equivalent O(3) atoms. In the second Sm site, Sm(2) is bonded in a body-centered cubic geometry to two equivalent O(3), two equivalent O(6), and four equivalent O(1) atoms. There are six inequivalent O sites. In the first O site, O(1) is bonded to one U(1), one Sm(1), and two equivalent Sm(2) atoms to form OSm3U tetrahedra that share  a cornercorner with one O(5)U6 octahedra, corners with two equivalent O(6)Sm2U2 tetrahedra, corners with two equivalent O(2)SmU3 tetrahedra, corners with two equivalent O(4)U4 tetrahedra, corners with four equivalent O(3)Sm3U tetrahedra, corners with six equivalent O(1)Sm3U tetrahedra,  an edgeedge with one O(1)Sm3U tetrahedra,  an edgeedge with one O(2)SmU3 tetrahedra, edges with two equivalent O(6)Sm2U2 tetrahedra, and edges with two equivalent O(3)Sm3U tetrahedra. The corner-sharing octahedral tilt angles are 54°. In the second O site, O(2) is bonded to one U(1), two equivalent U(2), and one Sm(1) atom to form OSmU3 tetrahedra that share corners with two equivalent O(5)U6 octahedra, corners with two equivalent O(6)Sm2U2 tetrahedra, corners with two equivalent O(1)Sm3U tetrahedra, corners with two equivalent O(4)U4 tetrahedra, corners with four equivalent O(3)Sm3U tetrahedra, corners with six equivalent O(2)SmU3 tetrahedra,  an edgeedge with one O(1)Sm3U tetrahedra,  an edgeedge with one O(2)SmU3 tetrahedra, edges with two equivalent O(3)Sm3U tetrahedra, edges with two equivalent O(4)U4 tetrahedra, and  a faceface with one O(5)U6 octahedra. The corner-sharing octahedral tilt angles are 54°. In the third O site, O(3) is bonded to one U(2), one Sm(2), and two equivalent Sm(1) atoms to form OSm3U tetrahedra that share corners with two equivalent O(5)U6 octahedra, corners with two equivalent O(6)Sm2U2 tetrahedra, corners with two equivalent O(4)U4 tetrahedra, corners with four equivalent O(1)Sm3U tetrahedra, corners with four equivalent O(3)Sm3U tetrahedra, corners with four equivalent O(2)SmU3 tetrahedra, edges with two equivalent O(1)Sm3U tetrahedra, edges with two equivalent O(3)Sm3U tetrahedra, and edges with two equivalent O(2)SmU3 tetrahedra. The corner-sharing octahedral tilt angles are 56°. In the fourth O site, O(4) is bonded to two equivalent U(1) and two equivalent U(2) atoms to form OU4 tetrahedra that share corners with two equivalent O(6)Sm2U2 tetrahedra, corners with two equivalent O(4)U4 tetrahedra, corners with four equivalent O(1)Sm3U tetrahedra, corners with four equivalent O(3)Sm3U tetrahedra, corners with four equivalent O(2)SmU3 tetrahedra,  an edgeedge with one O(6)Sm2U2 tetrahedra,  an edgeedge with one O(4)U4 tetrahedra, edges with four equivalent O(2)SmU3 tetrahedra, and faces with two equivalent O(5)U6 octahedra. In the fifth O site, O(5) is bonded to two equivalent U(1) and four equivalent U(2) atoms to form OU6 octahedra that share corners with four equivalent O(6)Sm2U2 tetrahedra, corners with four equivalent O(1)Sm3U tetrahedra, corners with eight equivalent O(3)Sm3U tetrahedra, corners with eight equivalent O(2)SmU3 tetrahedra, edges with two equivalent O(5)U6 octahedra, faces with four equivalent O(2)SmU3 tetrahedra, and faces with four equivalent O(4)U4 tetrahedra. In the sixth O site, O(6) is bonded to two equivalent U(1) and two equivalent Sm(2) atoms to form OSm2U2 tetrahedra that share corners with two equivalent O(5)U6 octahedra, corners with two equivalent O(6)Sm2U2 tetrahedra, corners with two equivalent O(4)U4 tetrahedra, corners with four equivalent O(1)Sm3U tetrahedra, corners with four equivalent O(3)Sm3U tetrahedra, corners with four equivalent O(2)SmU3 tetrahedra,  an edgeedge with one O(6)Sm2U2 tetrahedra,  an edgeedge with one O(4)U4 tetrahedra, and edges with four equivalent O(1)Sm3U tetrahedra. The corner-sharing octahedral tilt angles are 57°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sm4U4O17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.361
_cell_length_b   9.361
_cell_length_c   3.835
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   108.256
_symmetry_Int_Tables_number   1
_cell_volume   319.149
_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
  Sm  Sm0  1  0.000  0.500  0.500  1.0
  Sm  Sm1  1  0.126  0.874  0.000  1.0
  Sm  Sm2  1  0.500  0.000  0.500  1.0
  Sm  Sm3  1  0.874  0.126  0.000  1.0
  U  U4  1  0.250  0.250  0.500  1.0
  U  U5  1  0.380  0.620  0.000  1.0
  U  U6  1  0.620  0.380  0.000  1.0
  U  U7  1  0.750  0.750  0.500  1.0
  O  O8  1  0.016  0.249  0.500  1.0
  O  O9  1  0.984  0.751  0.500  1.0
  O  O10  1  0.248  0.491  0.500  1.0
  O  O11  1  0.148  0.619  0.000  1.0
  O  O12  1  0.491  0.248  0.500  1.0
  O  O13  1  0.359  0.359  0.000  1.0
  O  O14  1  0.500  0.500  0.500  1.0
  O  O15  1  0.641  0.641  0.000  1.0
  O  O16  1  0.852  0.381  0.000  1.0
  O  O17  1  0.249  0.016  0.500  1.0
  O  O18  1  0.381  0.852  0.000  1.0
  O  O19  1  0.135  0.135  0.000  1.0
  O  O20  1  0.752  0.509  0.500  1.0
  O  O21  1  0.509  0.752  0.500  1.0
  O  O22  1  0.865  0.865  0.000  1.0
  O  O23  1  0.751  0.984  0.500  1.0
  O  O24  1  0.619  0.148  0.000  1.0
[/CIF]
.
The material structure described by U4Sm4O17 is alpha bismuth trifluoride-derived structured and crystallizes in the orthorhombic Cmmm space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a body-centered cubic geometry to one O(5), two equivalent O(1), two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms. In the second U site, U(2) is bonded in a 10-coordinate geometry to two equivalent O(3), two equivalent O(4), two equivalent O(5), and four equivalent O(2) atoms. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(2), and four equivalent O(3) atoms. In the second Sm site, Sm(2) is bonded in a body-centered cubic geometry to two equivalent O(3), two equivalent O(6), and four equivalent O(1) atoms. There are six inequivalent O sites. In the first O site, O(1) is bonded to one U(1), one Sm(1), and two equivalent Sm(2) atoms to form OSm3U tetrahedra that share  a cornercorner with one O(5)U6 octahedra, corners with two equivalent O(6)Sm2U2 tetrahedra, corners with two equivalent O(2)SmU3 tetrahedra, corners with two equivalent O(4)U4 tetrahedra, corners with four equivalent O(3)Sm3U tetrahedra, corners with six equivalent O(1)Sm3U tetrahedra,  an edgeedge with one O(1)Sm3U tetrahedra,  an edgeedge with one O(2)SmU3 tetrahedra, edges with two equivalent O(6)Sm2U2 tetrahedra, and edges with two equivalent O(3)Sm3U tetrahedra. The corner-sharing octahedral tilt angles are 54°. In the second O site, O(2) is bonded to one U(1), two equivalent U(2), and one Sm(1) atom to form OSmU3 tetrahedra that share corners with two equivalent O(5)U6 octahedra, corners with two equivalent O(6)Sm2U2 tetrahedra, corners with two equivalent O(1)Sm3U tetrahedra, corners with two equivalent O(4)U4 tetrahedra, corners with four equivalent O(3)Sm3U tetrahedra, corners with six equivalent O(2)SmU3 tetrahedra,  an edgeedge with one O(1)Sm3U tetrahedra,  an edgeedge with one O(2)SmU3 tetrahedra, edges with two equivalent O(3)Sm3U tetrahedra, edges with two equivalent O(4)U4 tetrahedra, and  a faceface with one O(5)U6 octahedra. The corner-sharing octahedral tilt angles are 54°. In the third O site, O(3) is bonded to one U(2), one Sm(2), and two equivalent Sm(1) atoms to form OSm3U tetrahedra that share corners with two equivalent O(5)U6 octahedra, corners with two equivalent O(6)Sm2U2 tetrahedra, corners with two equivalent O(4)U4 tetrahedra, corners with four equivalent O(1)Sm3U tetrahedra, corners with four equivalent O(3)Sm3U tetrahedra, corners with four equivalent O(2)SmU3 tetrahedra, edges with two equivalent O(1)Sm3U tetrahedra, edges with two equivalent O(3)Sm3U tetrahedra, and edges with two equivalent O(2)SmU3 tetrahedra. The corner-sharing octahedral tilt angles are 56°. In the fourth O site, O(4) is bonded to two equivalent U(1) and two equivalent U(2) atoms to form OU4 tetrahedra that share corners with two equivalent O(6)Sm2U2 tetrahedra, corners with two equivalent O(4)U4 tetrahedra, corners with four equivalent O(1)Sm3U tetrahedra, corners with four equivalent O(3)Sm3U tetrahedra, corners with four equivalent O(2)SmU3 tetrahedra,  an edgeedge with one O(6)Sm2U2 tetrahedra,  an edgeedge with one O(4)U4 tetrahedra, edges with four equivalent O(2)SmU3 tetrahedra, and faces with two equivalent O(5)U6 octahedra. In the fifth O site, O(5) is bonded to two equivalent U(1) and four equivalent U(2) atoms to form OU6 octahedra that share corners with four equivalent O(6)Sm2U2 tetrahedra, corners with four equivalent O(1)Sm3U tetrahedra, corners with eight equivalent O(3)Sm3U tetrahedra, corners with eight equivalent O(2)SmU3 tetrahedra, edges with two equivalent O(5)U6 octahedra, faces with four equivalent O(2)SmU3 tetrahedra, and faces with four equivalent O(4)U4 tetrahedra. In the sixth O site, O(6) is bonded to two equivalent U(1) and two equivalent Sm(2) atoms to form OSm2U2 tetrahedra that share corners with two equivalent O(5)U6 octahedra, corners with two equivalent O(6)Sm2U2 tetrahedra, corners with two equivalent O(4)U4 tetrahedra, corners with four equivalent O(1)Sm3U tetrahedra, corners with four equivalent O(3)Sm3U tetrahedra, corners with four equivalent O(2)SmU3 tetrahedra,  an edgeedge with one O(6)Sm2U2 tetrahedra,  an edgeedge with one O(4)U4 tetrahedra, and edges with four equivalent O(1)Sm3U tetrahedra. The corner-sharing octahedral tilt angles are 57°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sm4U4O17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.361
_cell_length_b   9.361
_cell_length_c   3.835
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   108.256
_symmetry_Int_Tables_number   1
_cell_volume   319.149
_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
  Sm  Sm0  1  0.000  0.500  0.500  1.0
  Sm  Sm1  1  0.126  0.874  0.000  1.0
  Sm  Sm2  1  0.500  0.000  0.500  1.0
  Sm  Sm3  1  0.874  0.126  0.000  1.0
  U  U4  1  0.250  0.250  0.500  1.0
  U  U5  1  0.380  0.620  0.000  1.0
  U  U6  1  0.620  0.380  0.000  1.0
  U  U7  1  0.750  0.750  0.500  1.0
  O  O8  1  0.016  0.249  0.500  1.0
  O  O9  1  0.984  0.751  0.500  1.0
  O  O10  1  0.248  0.491  0.500  1.0
  O  O11  1  0.148  0.619  0.000  1.0
  O  O12  1  0.491  0.248  0.500  1.0
  O  O13  1  0.359  0.359  0.000  1.0
  O  O14  1  0.500  0.500  0.500  1.0
  O  O15  1  0.641  0.641  0.000  1.0
  O  O16  1  0.852  0.381  0.000  1.0
  O  O17  1  0.249  0.016  0.500  1.0
  O  O18  1  0.381  0.852  0.000  1.0
  O  O19  1  0.135  0.135  0.000  1.0
  O  O20  1  0.752  0.509  0.500  1.0
  O  O21  1  0.509  0.752  0.500  1.0
  O  O22  1  0.865  0.865  0.000  1.0
  O  O23  1  0.751  0.984  0.500  1.0
  O  O24  1  0.619  0.148  0.000  1.0
[/CIF]
.