The material structure described by Mg2Nb2SbO8 crystallizes in the triclinic P1 space group. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 6-coordinate geometry to one O(12), one O(13), one O(14), one O(15), one O(16), and one O(9) atom. In the second Mg site, Mg(2) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(13), one O(14), one O(15), and one O(16) atom. In the third Mg site, Mg(3) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(12), one O(14), one O(16), and one O(9) atom. In the fourth Mg site, Mg(4) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(12), one O(13), one O(15), and one O(9) atom. There are four inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(1), one O(14), one O(15), one O(4), one O(5), and one O(9) atom to form distorted NbO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra, corners with two equivalent Sb(2)O6 octahedra, and edges with two equivalent Nb(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 39-63°. In the second Nb site, Nb(2) is bonded to one O(10), one O(13), one O(16), one O(2), one O(3), and one O(6) atom to form distorted NbO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra, corners with two equivalent Sb(2)O6 octahedra, and edges with two equivalent Nb(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 39-63°. In the third Nb site, Nb(3) is bonded to one O(10), one O(12), one O(16), one O(2), one O(3), and one O(7) atom to form distorted NbO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra, corners with two equivalent Sb(2)O6 octahedra, and edges with two equivalent Nb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 39-64°. In the fourth Nb site, Nb(4) is bonded to one O(1), one O(11), one O(15), one O(4), one O(8), and one O(9) atom to form distorted NbO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra, corners with two equivalent Sb(2)O6 octahedra, and edges with two equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-64°. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form distorted SbO6 octahedra that share corners with two equivalent Nb(1)O6 octahedra, corners with two equivalent Nb(2)O6 octahedra, corners with two equivalent Nb(3)O6 octahedra, corners with two equivalent Nb(4)O6 octahedra, and edges with two equivalent Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 39-64°. In the second Sb site, Sb(2) is bonded to one O(1), one O(2), one O(5), one O(6), one O(7), and one O(8) atom to form distorted SbO6 octahedra that share corners with two equivalent Nb(1)O6 octahedra, corners with two equivalent Nb(2)O6 octahedra, corners with two equivalent Nb(3)O6 octahedra, corners with two equivalent Nb(4)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 39-64°. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Nb(1), one Nb(4), and one Sb(2) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Nb(2), one Nb(3), and one Sb(2) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Nb(2), one Nb(3), and one Sb(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Nb(1), one Nb(4), and one Sb(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Nb(1), one Sb(1), and one Sb(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Nb(2), one Sb(1), and one Sb(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Nb(3), one Sb(1), and one Sb(2) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Nb(4), one Sb(1), and one Sb(2) atom. In the ninth O site, O(9) is bonded in a 5-coordinate geometry to one Mg(1), one Mg(3), one Mg(4), one Nb(1), and one Nb(4) atom. In the tenth O site, O(10) is bonded in a 5-coordinate geometry to one Mg(2), one Mg(3), one Mg(4), one Nb(2), and one Nb(3) atom. In the eleventh O site, O(11) is bonded to one Mg(2), one Mg(3), one Mg(4), and one Nb(4) atom to form a mixture of edge and corner-sharing OMg3Nb trigonal pyramids. In the twelfth O site, O(12) is bonded to one Mg(1), one Mg(3), one Mg(4), and one Nb(3) atom to form a mixture of edge and corner-sharing OMg3Nb trigonal pyramids. In the thirteenth O site, O(13) is bonded to one Mg(1), one Mg(2), one Mg(4), and one Nb(2) atom to form a mixture of edge and corner-sharing OMg3Nb trigonal pyramids. In the fourteenth O site, O(14) is bonded to one Mg(1), one Mg(2), one Mg(3), and one Nb(1) atom to form a mixture of edge and corner-sharing OMg3Nb trigonal pyramids. In the fifteenth O site, O(15) is bonded in a 5-coordinate geometry to one Mg(1), one Mg(2), one Mg(4), one Nb(1), and one Nb(4) atom. In the sixteenth O site, O(16) is bonded in a 5-coordinate geometry to one Mg(1), one Mg(2), one Mg(3), one Nb(2), and one Nb(3) atom. is represented by the CIF card [CIF]
data_Mg2Nb2SbO8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.373
_cell_length_b   5.985
_cell_length_c   10.656
_cell_angle_alpha   106.349
_cell_angle_beta   94.108
_cell_angle_gamma   89.797
_symmetry_Int_Tables_number   1
_cell_volume   327.929
_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
  Mg  Mg0  1  0.761  0.420  0.542  1.0
  Mg  Mg1  1  0.739  0.878  0.455  1.0
  Mg  Mg2  1  0.240  0.576  0.456  1.0
  Mg  Mg3  1  0.260  0.119  0.543  1.0
  Nb  Nb4  1  0.732  0.288  0.247  1.0
  Nb  Nb5  1  0.770  0.044  0.752  1.0
  Nb  Nb6  1  0.268  0.711  0.750  1.0
  Nb  Nb7  1  0.234  0.960  0.247  1.0
  Sb  Sb8  1  0.750  0.676  1.000  1.0
  Sb  Sb9  1  0.254  0.332  0.999  1.0
  O  O10  1  0.028  0.165  0.156  1.0
  O  O11  1  0.474  0.009  0.841  1.0
  O  O12  1  0.971  0.834  0.843  1.0
  O  O13  1  0.533  0.983  0.155  1.0
  O  O14  1  0.611  0.456  0.115  1.0
  O  O15  1  0.889  0.339  0.878  1.0
  O  O16  1  0.390  0.542  0.883  1.0
  O  O17  1  0.111  0.658  0.117  1.0
  O  O18  1  0.439  0.290  0.371  1.0
  O  O19  1  0.058  0.916  0.624  1.0
  O  O20  1  0.368  0.835  0.392  1.0
  O  O21  1  0.131  0.441  0.606  1.0
  O  O22  1  0.629  0.162  0.605  1.0
  O  O23  1  0.868  0.556  0.392  1.0
  O  O24  1  0.939  0.082  0.373  1.0
  O  O25  1  0.557  0.704  0.624  1.0
[/CIF]
.
The material structure described by Mg2Nb2SbO8 crystallizes in the triclinic P1 space group. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 6-coordinate geometry to one O(12), one O(13), one O(14), one O(15), one O(16), and one O(9) atom. In the second Mg site, Mg(2) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(13), one O(14), one O(15), and one O(16) atom. In the third Mg site, Mg(3) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(12), one O(14), one O(16), and one O(9) atom. In the fourth Mg site, Mg(4) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(12), one O(13), one O(15), and one O(9) atom. There are four inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(1), one O(14), one O(15), one O(4), one O(5), and one O(9) atom to form distorted NbO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra, corners with two equivalent Sb(2)O6 octahedra, and edges with two equivalent Nb(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 39-63°. In the second Nb site, Nb(2) is bonded to one O(10), one O(13), one O(16), one O(2), one O(3), and one O(6) atom to form distorted NbO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra, corners with two equivalent Sb(2)O6 octahedra, and edges with two equivalent Nb(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 39-63°. In the third Nb site, Nb(3) is bonded to one O(10), one O(12), one O(16), one O(2), one O(3), and one O(7) atom to form distorted NbO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra, corners with two equivalent Sb(2)O6 octahedra, and edges with two equivalent Nb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 39-64°. In the fourth Nb site, Nb(4) is bonded to one O(1), one O(11), one O(15), one O(4), one O(8), and one O(9) atom to form distorted NbO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra, corners with two equivalent Sb(2)O6 octahedra, and edges with two equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-64°. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form distorted SbO6 octahedra that share corners with two equivalent Nb(1)O6 octahedra, corners with two equivalent Nb(2)O6 octahedra, corners with two equivalent Nb(3)O6 octahedra, corners with two equivalent Nb(4)O6 octahedra, and edges with two equivalent Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 39-64°. In the second Sb site, Sb(2) is bonded to one O(1), one O(2), one O(5), one O(6), one O(7), and one O(8) atom to form distorted SbO6 octahedra that share corners with two equivalent Nb(1)O6 octahedra, corners with two equivalent Nb(2)O6 octahedra, corners with two equivalent Nb(3)O6 octahedra, corners with two equivalent Nb(4)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 39-64°. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Nb(1), one Nb(4), and one Sb(2) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Nb(2), one Nb(3), and one Sb(2) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Nb(2), one Nb(3), and one Sb(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Nb(1), one Nb(4), and one Sb(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Nb(1), one Sb(1), and one Sb(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Nb(2), one Sb(1), and one Sb(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Nb(3), one Sb(1), and one Sb(2) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Nb(4), one Sb(1), and one Sb(2) atom. In the ninth O site, O(9) is bonded in a 5-coordinate geometry to one Mg(1), one Mg(3), one Mg(4), one Nb(1), and one Nb(4) atom. In the tenth O site, O(10) is bonded in a 5-coordinate geometry to one Mg(2), one Mg(3), one Mg(4), one Nb(2), and one Nb(3) atom. In the eleventh O site, O(11) is bonded to one Mg(2), one Mg(3), one Mg(4), and one Nb(4) atom to form a mixture of edge and corner-sharing OMg3Nb trigonal pyramids. In the twelfth O site, O(12) is bonded to one Mg(1), one Mg(3), one Mg(4), and one Nb(3) atom to form a mixture of edge and corner-sharing OMg3Nb trigonal pyramids. In the thirteenth O site, O(13) is bonded to one Mg(1), one Mg(2), one Mg(4), and one Nb(2) atom to form a mixture of edge and corner-sharing OMg3Nb trigonal pyramids. In the fourteenth O site, O(14) is bonded to one Mg(1), one Mg(2), one Mg(3), and one Nb(1) atom to form a mixture of edge and corner-sharing OMg3Nb trigonal pyramids. In the fifteenth O site, O(15) is bonded in a 5-coordinate geometry to one Mg(1), one Mg(2), one Mg(4), one Nb(1), and one Nb(4) atom. In the sixteenth O site, O(16) is bonded in a 5-coordinate geometry to one Mg(1), one Mg(2), one Mg(3), one Nb(2), and one Nb(3) atom. is represented by the CIF card [CIF]
data_Mg2Nb2SbO8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.373
_cell_length_b   5.985
_cell_length_c   10.656
_cell_angle_alpha   106.349
_cell_angle_beta   94.108
_cell_angle_gamma   89.797
_symmetry_Int_Tables_number   1
_cell_volume   327.929
_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
  Mg  Mg0  1  0.761  0.420  0.542  1.0
  Mg  Mg1  1  0.739  0.878  0.455  1.0
  Mg  Mg2  1  0.240  0.576  0.456  1.0
  Mg  Mg3  1  0.260  0.119  0.543  1.0
  Nb  Nb4  1  0.732  0.288  0.247  1.0
  Nb  Nb5  1  0.770  0.044  0.752  1.0
  Nb  Nb6  1  0.268  0.711  0.750  1.0
  Nb  Nb7  1  0.234  0.960  0.247  1.0
  Sb  Sb8  1  0.750  0.676  1.000  1.0
  Sb  Sb9  1  0.254  0.332  0.999  1.0
  O  O10  1  0.028  0.165  0.156  1.0
  O  O11  1  0.474  0.009  0.841  1.0
  O  O12  1  0.971  0.834  0.843  1.0
  O  O13  1  0.533  0.983  0.155  1.0
  O  O14  1  0.611  0.456  0.115  1.0
  O  O15  1  0.889  0.339  0.878  1.0
  O  O16  1  0.390  0.542  0.883  1.0
  O  O17  1  0.111  0.658  0.117  1.0
  O  O18  1  0.439  0.290  0.371  1.0
  O  O19  1  0.058  0.916  0.624  1.0
  O  O20  1  0.368  0.835  0.392  1.0
  O  O21  1  0.131  0.441  0.606  1.0
  O  O22  1  0.629  0.162  0.605  1.0
  O  O23  1  0.868  0.556  0.392  1.0
  O  O24  1  0.939  0.082  0.373  1.0
  O  O25  1  0.557  0.704  0.624  1.0
[/CIF]
.