The structure described by Sm7VO4Se8 crystallizes in the orthorhombic Pbam space group. There are four inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 3-coordinate geometry to one Se(2), two equivalent Se(3), two equivalent Se(4), one O(1), and two equivalent O(2) atoms. In the second Sm site, Sm(2) is bonded in a 7-coordinate geometry to one Se(1), one Se(2), two equivalent Se(3), two equivalent Se(4), and one O(1) atom. In the third Sm site, Sm(3) is bonded in a 3-coordinate geometry to one Se(4), two equivalent Se(1), two equivalent Se(2), one O(2), and two equivalent O(1) atoms. In the fourth Sm site, Sm(4) is bonded to two equivalent Se(3) and four equivalent Se(1) atoms to form edge-sharing SmSe6 octahedra. V(1) is bonded in a distorted linear geometry to four equivalent Se(2) and two equivalent O(2) atoms. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded to one Sm(2), two equivalent Sm(3), and two equivalent Sm(4) atoms to form SeSm5 square pyramids that share corners with two equivalent Se(1)Sm5 square pyramids, corners with two equivalent O(2)Sm3V tetrahedra, corners with three equivalent O(1)Sm4 tetrahedra, corners with four equivalent Se(4)Sm5 trigonal bipyramids, edges with three equivalent Se(1)Sm5 square pyramids, and  an edgeedge with one O(1)Sm4 tetrahedra. In the second Se site, Se(2) is bonded in a 6-coordinate geometry to one Sm(1), one Sm(2), two equivalent Sm(3), and two equivalent V(1) atoms. In the third Se site, Se(3) is bonded in a 5-coordinate geometry to one Sm(4), two equivalent Sm(1), and two equivalent Sm(2) atoms. In the fourth Se site, Se(4) is bonded to one Sm(3), two equivalent Sm(1), and two equivalent Sm(2) atoms to form distorted SeSm5 trigonal bipyramids that share corners with four equivalent Se(1)Sm5 square pyramids, corners with two equivalent O(1)Sm4 tetrahedra, corners with three equivalent O(2)Sm3V tetrahedra,  an edgeedge with one O(2)Sm3V tetrahedra, edges with two equivalent O(1)Sm4 tetrahedra, and edges with two equivalent Se(4)Sm5 trigonal bipyramids. There are two inequivalent O sites. In the first O site, O(1) is bonded to one Sm(1), one Sm(2), and two equivalent Sm(3) atoms to form OSm4 tetrahedra that share corners with three equivalent Se(1)Sm5 square pyramids, corners with two equivalent O(1)Sm4 tetrahedra, corners with two equivalent Se(4)Sm5 trigonal bipyramids,  an edgeedge with one Se(1)Sm5 square pyramid, edges with two equivalent O(2)Sm3V tetrahedra, and edges with two equivalent Se(4)Sm5 trigonal bipyramids. In the second O site, O(2) is bonded to one Sm(3), two equivalent Sm(1), and one V(1) atom to form OSm3V tetrahedra that share corners with two equivalent Se(1)Sm5 square pyramids, corners with three equivalent O(2)Sm3V tetrahedra, corners with three equivalent Se(4)Sm5 trigonal bipyramids, edges with two equivalent O(1)Sm4 tetrahedra, and  an edgeedge with one Se(4)Sm5 trigonal bipyramid. is represented by the CIF card [CIF]
data_Sm7V(Se2O)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.990
_cell_length_b   14.334
_cell_length_c   15.749
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   900.794
_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
  Sm  Sm0  1  0.500  0.507  0.310  1.0
  Sm  Sm1  1  0.500  0.493  0.690  1.0
  Sm  Sm2  1  0.500  0.007  0.190  1.0
  Sm  Sm3  1  0.500  0.993  0.810  1.0
  Sm  Sm4  1  0.500  0.720  0.165  1.0
  Sm  Sm5  1  0.500  0.280  0.835  1.0
  Sm  Sm6  1  0.500  0.220  0.335  1.0
  Sm  Sm7  1  0.500  0.780  0.665  1.0
  Sm  Sm8  1  0.000  0.710  0.381  1.0
  Sm  Sm9  1  0.000  0.290  0.619  1.0
  Sm  Sm10  1  0.000  0.210  0.119  1.0
  Sm  Sm11  1  0.000  0.790  0.881  1.0
  Sm  Sm12  1  0.000  0.500  0.000  1.0
  Sm  Sm13  1  0.000  0.000  0.500  1.0
  V  V14  1  0.000  0.500  0.500  1.0
  V  V15  1  0.000  0.000  0.000  1.0
  Se  Se16  1  0.500  0.855  0.471  1.0
  Se  Se17  1  0.500  0.145  0.529  1.0
  Se  Se18  1  0.500  0.355  0.029  1.0
  Se  Se19  1  0.500  0.645  0.971  1.0
  Se  Se20  1  0.500  0.880  0.033  1.0
  Se  Se21  1  0.500  0.120  0.967  1.0
  Se  Se22  1  0.500  0.380  0.467  1.0
  Se  Se23  1  0.500  0.620  0.533  1.0
  Se  Se24  1  0.000  0.570  0.172  1.0
  Se  Se25  1  0.000  0.430  0.828  1.0
  Se  Se26  1  0.000  0.070  0.328  1.0
  Se  Se27  1  0.000  0.930  0.672  1.0
  Se  Se28  1  0.000  0.844  0.236  1.0
  Se  Se29  1  0.000  0.156  0.764  1.0
  Se  Se30  1  0.000  0.344  0.264  1.0
  Se  Se31  1  0.000  0.656  0.736  1.0
  O  O32  1  0.500  0.673  0.312  1.0
  O  O33  1  0.500  0.327  0.688  1.0
  O  O34  1  0.500  0.173  0.188  1.0
  O  O35  1  0.500  0.827  0.812  1.0
  O  O36  1  0.000  0.546  0.380  1.0
  O  O37  1  0.000  0.454  0.620  1.0
  O  O38  1  0.000  0.046  0.120  1.0
  O  O39  1  0.000  0.954  0.880  1.0
[/CIF]
.
The structure described by Sm7VO4Se8 crystallizes in the orthorhombic Pbam space group. There are four inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 3-coordinate geometry to one Se(2), two equivalent Se(3), two equivalent Se(4), one O(1), and two equivalent O(2) atoms. In the second Sm site, Sm(2) is bonded in a 7-coordinate geometry to one Se(1), one Se(2), two equivalent Se(3), two equivalent Se(4), and one O(1) atom. In the third Sm site, Sm(3) is bonded in a 3-coordinate geometry to one Se(4), two equivalent Se(1), two equivalent Se(2), one O(2), and two equivalent O(1) atoms. In the fourth Sm site, Sm(4) is bonded to two equivalent Se(3) and four equivalent Se(1) atoms to form edge-sharing SmSe6 octahedra. V(1) is bonded in a distorted linear geometry to four equivalent Se(2) and two equivalent O(2) atoms. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded to one Sm(2), two equivalent Sm(3), and two equivalent Sm(4) atoms to form SeSm5 square pyramids that share corners with two equivalent Se(1)Sm5 square pyramids, corners with two equivalent O(2)Sm3V tetrahedra, corners with three equivalent O(1)Sm4 tetrahedra, corners with four equivalent Se(4)Sm5 trigonal bipyramids, edges with three equivalent Se(1)Sm5 square pyramids, and  an edgeedge with one O(1)Sm4 tetrahedra. In the second Se site, Se(2) is bonded in a 6-coordinate geometry to one Sm(1), one Sm(2), two equivalent Sm(3), and two equivalent V(1) atoms. In the third Se site, Se(3) is bonded in a 5-coordinate geometry to one Sm(4), two equivalent Sm(1), and two equivalent Sm(2) atoms. In the fourth Se site, Se(4) is bonded to one Sm(3), two equivalent Sm(1), and two equivalent Sm(2) atoms to form distorted SeSm5 trigonal bipyramids that share corners with four equivalent Se(1)Sm5 square pyramids, corners with two equivalent O(1)Sm4 tetrahedra, corners with three equivalent O(2)Sm3V tetrahedra,  an edgeedge with one O(2)Sm3V tetrahedra, edges with two equivalent O(1)Sm4 tetrahedra, and edges with two equivalent Se(4)Sm5 trigonal bipyramids. There are two inequivalent O sites. In the first O site, O(1) is bonded to one Sm(1), one Sm(2), and two equivalent Sm(3) atoms to form OSm4 tetrahedra that share corners with three equivalent Se(1)Sm5 square pyramids, corners with two equivalent O(1)Sm4 tetrahedra, corners with two equivalent Se(4)Sm5 trigonal bipyramids,  an edgeedge with one Se(1)Sm5 square pyramid, edges with two equivalent O(2)Sm3V tetrahedra, and edges with two equivalent Se(4)Sm5 trigonal bipyramids. In the second O site, O(2) is bonded to one Sm(3), two equivalent Sm(1), and one V(1) atom to form OSm3V tetrahedra that share corners with two equivalent Se(1)Sm5 square pyramids, corners with three equivalent O(2)Sm3V tetrahedra, corners with three equivalent Se(4)Sm5 trigonal bipyramids, edges with two equivalent O(1)Sm4 tetrahedra, and  an edgeedge with one Se(4)Sm5 trigonal bipyramid. is represented by the CIF card [CIF]
data_Sm7V(Se2O)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.990
_cell_length_b   14.334
_cell_length_c   15.749
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   900.794
_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
  Sm  Sm0  1  0.500  0.507  0.310  1.0
  Sm  Sm1  1  0.500  0.493  0.690  1.0
  Sm  Sm2  1  0.500  0.007  0.190  1.0
  Sm  Sm3  1  0.500  0.993  0.810  1.0
  Sm  Sm4  1  0.500  0.720  0.165  1.0
  Sm  Sm5  1  0.500  0.280  0.835  1.0
  Sm  Sm6  1  0.500  0.220  0.335  1.0
  Sm  Sm7  1  0.500  0.780  0.665  1.0
  Sm  Sm8  1  0.000  0.710  0.381  1.0
  Sm  Sm9  1  0.000  0.290  0.619  1.0
  Sm  Sm10  1  0.000  0.210  0.119  1.0
  Sm  Sm11  1  0.000  0.790  0.881  1.0
  Sm  Sm12  1  0.000  0.500  0.000  1.0
  Sm  Sm13  1  0.000  0.000  0.500  1.0
  V  V14  1  0.000  0.500  0.500  1.0
  V  V15  1  0.000  0.000  0.000  1.0
  Se  Se16  1  0.500  0.855  0.471  1.0
  Se  Se17  1  0.500  0.145  0.529  1.0
  Se  Se18  1  0.500  0.355  0.029  1.0
  Se  Se19  1  0.500  0.645  0.971  1.0
  Se  Se20  1  0.500  0.880  0.033  1.0
  Se  Se21  1  0.500  0.120  0.967  1.0
  Se  Se22  1  0.500  0.380  0.467  1.0
  Se  Se23  1  0.500  0.620  0.533  1.0
  Se  Se24  1  0.000  0.570  0.172  1.0
  Se  Se25  1  0.000  0.430  0.828  1.0
  Se  Se26  1  0.000  0.070  0.328  1.0
  Se  Se27  1  0.000  0.930  0.672  1.0
  Se  Se28  1  0.000  0.844  0.236  1.0
  Se  Se29  1  0.000  0.156  0.764  1.0
  Se  Se30  1  0.000  0.344  0.264  1.0
  Se  Se31  1  0.000  0.656  0.736  1.0
  O  O32  1  0.500  0.673  0.312  1.0
  O  O33  1  0.500  0.327  0.688  1.0
  O  O34  1  0.500  0.173  0.188  1.0
  O  O35  1  0.500  0.827  0.812  1.0
  O  O36  1  0.000  0.546  0.380  1.0
  O  O37  1  0.000  0.454  0.620  1.0
  O  O38  1  0.000  0.046  0.120  1.0
  O  O39  1  0.000  0.954  0.880  1.0
[/CIF]
.