The crystal structure described by Sm2InNbO7 crystallizes in the orthorhombic Imma space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to two equivalent O(1), two equivalent O(2), and four equivalent O(4) atoms to form distorted SmO8 hexagonal bipyramids that share edges with two equivalent Sm(1)O8 hexagonal bipyramids, edges with two equivalent In(1)O6 octahedra, and edges with four equivalent Nb(1)O6 octahedra. In the second Sm site, Sm(2) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(3), and four equivalent O(4) atoms. Nb(1) is bonded to two equivalent O(2) and four equivalent O(4) atoms to form NbO6 octahedra that share corners with two equivalent Nb(1)O6 octahedra, corners with four equivalent In(1)O6 octahedra, and edges with four equivalent Sm(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 38-53°. In(1) is bonded to two equivalent O(3) and four equivalent O(4) atoms to form InO6 octahedra that share corners with two equivalent In(1)O6 octahedra, corners with four equivalent Nb(1)O6 octahedra, and edges with two equivalent Sm(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 53-62°. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sm(1) and two equivalent Sm(2) atoms to form OSm4 tetrahedra that share corners with two equivalent O(3)Sm2In2 tetrahedra, corners with four equivalent O(1)Sm4 tetrahedra, corners with eight equivalent O(4)Sm2NbIn tetrahedra,  an edgeedge with one O(3)Sm2In2 tetrahedra, and edges with four equivalent O(4)Sm2NbIn tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Sm(1) and two equivalent Nb(1) atoms. In the third O site, O(3) is bonded to two equivalent Sm(2) and two equivalent In(1) atoms to form OSm2In2 tetrahedra that share corners with two equivalent O(1)Sm4 tetrahedra, corners with four equivalent O(3)Sm2In2 tetrahedra, corners with eight equivalent O(4)Sm2NbIn tetrahedra,  an edgeedge with one O(1)Sm4 tetrahedra, and edges with four equivalent O(4)Sm2NbIn tetrahedra. In the fourth O site, O(4) is bonded to one Sm(1), one Sm(2), one Nb(1), and one In(1) atom to form distorted OSm2NbIn tetrahedra that share corners with two equivalent O(3)Sm2In2 tetrahedra, corners with two equivalent O(1)Sm4 tetrahedra, corners with eight equivalent O(4)Sm2NbIn tetrahedra,  an edgeedge with one O(3)Sm2In2 tetrahedra,  an edgeedge with one O(1)Sm4 tetrahedra, and edges with two equivalent O(4)Sm2NbIn tetrahedra. is represented by the CIF file [CIF]
data_Sm2NbInO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.535
_cell_length_b   7.535
_cell_length_c   7.535
_cell_angle_alpha   120.967
_cell_angle_beta   119.012
_cell_angle_gamma   90.027
_symmetry_Int_Tables_number   1
_cell_volume   302.419
_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  0.500  0.500  1.0
  Sm  Sm1  1  0.500  0.000  0.000  1.0
  Sm  Sm2  1  0.500  0.500  0.000  1.0
  Sm  Sm3  1  0.000  0.500  0.500  1.0
  Nb  Nb4  1  0.000  0.000  0.000  1.0
  Nb  Nb5  1  0.500  0.000  0.500  1.0
  In  In6  1  0.000  0.000  0.500  1.0
  In  In7  1  0.000  0.500  0.000  1.0
  O  O8  1  0.379  0.629  0.750  1.0
  O  O9  1  0.621  0.371  0.250  1.0
  O  O10  1  0.312  0.062  0.250  1.0
  O  O11  1  0.896  0.646  0.250  1.0
  O  O12  1  0.349  0.675  0.274  1.0
  O  O13  1  0.901  0.076  0.226  1.0
  O  O14  1  0.349  0.076  0.674  1.0
  O  O15  1  0.901  0.675  0.826  1.0
  O  O16  1  0.688  0.938  0.750  1.0
  O  O17  1  0.104  0.354  0.750  1.0
  O  O18  1  0.651  0.325  0.726  1.0
  O  O19  1  0.099  0.924  0.774  1.0
  O  O20  1  0.651  0.924  0.326  1.0
  O  O21  1  0.099  0.325  0.174  1.0
[/CIF]
.
The crystal structure described by Sm2InNbO7 crystallizes in the orthorhombic Imma space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to two equivalent O(1), two equivalent O(2), and four equivalent O(4) atoms to form distorted SmO8 hexagonal bipyramids that share edges with two equivalent Sm(1)O8 hexagonal bipyramids, edges with two equivalent In(1)O6 octahedra, and edges with four equivalent Nb(1)O6 octahedra. In the second Sm site, Sm(2) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(3), and four equivalent O(4) atoms. Nb(1) is bonded to two equivalent O(2) and four equivalent O(4) atoms to form NbO6 octahedra that share corners with two equivalent Nb(1)O6 octahedra, corners with four equivalent In(1)O6 octahedra, and edges with four equivalent Sm(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 38-53°. In(1) is bonded to two equivalent O(3) and four equivalent O(4) atoms to form InO6 octahedra that share corners with two equivalent In(1)O6 octahedra, corners with four equivalent Nb(1)O6 octahedra, and edges with two equivalent Sm(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 53-62°. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sm(1) and two equivalent Sm(2) atoms to form OSm4 tetrahedra that share corners with two equivalent O(3)Sm2In2 tetrahedra, corners with four equivalent O(1)Sm4 tetrahedra, corners with eight equivalent O(4)Sm2NbIn tetrahedra,  an edgeedge with one O(3)Sm2In2 tetrahedra, and edges with four equivalent O(4)Sm2NbIn tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Sm(1) and two equivalent Nb(1) atoms. In the third O site, O(3) is bonded to two equivalent Sm(2) and two equivalent In(1) atoms to form OSm2In2 tetrahedra that share corners with two equivalent O(1)Sm4 tetrahedra, corners with four equivalent O(3)Sm2In2 tetrahedra, corners with eight equivalent O(4)Sm2NbIn tetrahedra,  an edgeedge with one O(1)Sm4 tetrahedra, and edges with four equivalent O(4)Sm2NbIn tetrahedra. In the fourth O site, O(4) is bonded to one Sm(1), one Sm(2), one Nb(1), and one In(1) atom to form distorted OSm2NbIn tetrahedra that share corners with two equivalent O(3)Sm2In2 tetrahedra, corners with two equivalent O(1)Sm4 tetrahedra, corners with eight equivalent O(4)Sm2NbIn tetrahedra,  an edgeedge with one O(3)Sm2In2 tetrahedra,  an edgeedge with one O(1)Sm4 tetrahedra, and edges with two equivalent O(4)Sm2NbIn tetrahedra. is represented by the CIF file [CIF]
data_Sm2NbInO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.535
_cell_length_b   7.535
_cell_length_c   7.535
_cell_angle_alpha   120.967
_cell_angle_beta   119.012
_cell_angle_gamma   90.027
_symmetry_Int_Tables_number   1
_cell_volume   302.419
_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  0.500  0.500  1.0
  Sm  Sm1  1  0.500  0.000  0.000  1.0
  Sm  Sm2  1  0.500  0.500  0.000  1.0
  Sm  Sm3  1  0.000  0.500  0.500  1.0
  Nb  Nb4  1  0.000  0.000  0.000  1.0
  Nb  Nb5  1  0.500  0.000  0.500  1.0
  In  In6  1  0.000  0.000  0.500  1.0
  In  In7  1  0.000  0.500  0.000  1.0
  O  O8  1  0.379  0.629  0.750  1.0
  O  O9  1  0.621  0.371  0.250  1.0
  O  O10  1  0.312  0.062  0.250  1.0
  O  O11  1  0.896  0.646  0.250  1.0
  O  O12  1  0.349  0.675  0.274  1.0
  O  O13  1  0.901  0.076  0.226  1.0
  O  O14  1  0.349  0.076  0.674  1.0
  O  O15  1  0.901  0.675  0.826  1.0
  O  O16  1  0.688  0.938  0.750  1.0
  O  O17  1  0.104  0.354  0.750  1.0
  O  O18  1  0.651  0.325  0.726  1.0
  O  O19  1  0.099  0.924  0.774  1.0
  O  O20  1  0.651  0.924  0.326  1.0
  O  O21  1  0.099  0.325  0.174  1.0
[/CIF]
.