The structure described by Mg2Nb2SnO8 crystallizes in the monoclinic C2/c space group. Mg(1) is bonded in a 6-coordinate geometry to three equivalent O(3) and three equivalent O(4) atoms. Nb(1) is bonded in a 6-coordinate geometry to one O(2), one O(4), two equivalent O(1), and two equivalent O(3) atoms. Sn(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form distorted edge-sharing SnO6 octahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to two equivalent Nb(1) and one Sn(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Nb(1) and two equivalent Sn(1) atoms. In the third O site, O(3) is bonded in a 5-coordinate geometry to three equivalent Mg(1) and two equivalent Nb(1) atoms. In the fourth O site, O(4) is bonded to three equivalent Mg(1) and one Nb(1) atom to form a mixture of corner and edge-sharing OMg3Nb trigonal pyramids. is represented by the CIF card [CIF]
data_Mg2Nb2SnO8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.881
_cell_length_b   10.881
_cell_length_c   5.308
_cell_angle_alpha   88.983
_cell_angle_beta   88.983
_cell_angle_gamma   32.676
_symmetry_Int_Tables_number   1
_cell_volume   339.262
_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  0.871  0.589  0.256  1.0
  Mg  Mg1  1  0.411  0.129  0.244  1.0
  Mg  Mg2  1  0.129  0.411  0.744  1.0
  Mg  Mg3  1  0.589  0.871  0.756  1.0
  Nb  Nb4  1  0.045  0.701  0.234  1.0
  Nb  Nb5  1  0.299  0.955  0.266  1.0
  Nb  Nb6  1  0.955  0.299  0.766  1.0
  Nb  Nb7  1  0.701  0.045  0.734  1.0
  Sn  Sn8  1  0.694  0.306  0.250  1.0
  Sn  Sn9  1  0.306  0.694  0.750  1.0
  O  O10  1  0.004  0.828  0.544  1.0
  O  O11  1  0.172  0.996  0.956  1.0
  O  O12  1  0.996  0.172  0.456  1.0
  O  O13  1  0.828  0.004  0.044  1.0
  O  O14  1  0.309  0.553  0.116  1.0
  O  O15  1  0.447  0.691  0.384  1.0
  O  O16  1  0.691  0.447  0.884  1.0
  O  O17  1  0.553  0.309  0.616  1.0
  O  O18  1  0.920  0.696  0.953  1.0
  O  O19  1  0.304  0.080  0.547  1.0
  O  O20  1  0.450  0.157  0.882  1.0
  O  O21  1  0.843  0.550  0.618  1.0
  O  O22  1  0.550  0.843  0.118  1.0
  O  O23  1  0.157  0.450  0.382  1.0
  O  O24  1  0.696  0.920  0.453  1.0
  O  O25  1  0.080  0.304  0.047  1.0
[/CIF]
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The structure described by Mg2Nb2SnO8 crystallizes in the monoclinic C2/c space group. Mg(1) is bonded in a 6-coordinate geometry to three equivalent O(3) and three equivalent O(4) atoms. Nb(1) is bonded in a 6-coordinate geometry to one O(2), one O(4), two equivalent O(1), and two equivalent O(3) atoms. Sn(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form distorted edge-sharing SnO6 octahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to two equivalent Nb(1) and one Sn(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Nb(1) and two equivalent Sn(1) atoms. In the third O site, O(3) is bonded in a 5-coordinate geometry to three equivalent Mg(1) and two equivalent Nb(1) atoms. In the fourth O site, O(4) is bonded to three equivalent Mg(1) and one Nb(1) atom to form a mixture of corner and edge-sharing OMg3Nb trigonal pyramids. is represented by the CIF card [CIF]
data_Mg2Nb2SnO8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.881
_cell_length_b   10.881
_cell_length_c   5.308
_cell_angle_alpha   88.983
_cell_angle_beta   88.983
_cell_angle_gamma   32.676
_symmetry_Int_Tables_number   1
_cell_volume   339.262
_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  0.871  0.589  0.256  1.0
  Mg  Mg1  1  0.411  0.129  0.244  1.0
  Mg  Mg2  1  0.129  0.411  0.744  1.0
  Mg  Mg3  1  0.589  0.871  0.756  1.0
  Nb  Nb4  1  0.045  0.701  0.234  1.0
  Nb  Nb5  1  0.299  0.955  0.266  1.0
  Nb  Nb6  1  0.955  0.299  0.766  1.0
  Nb  Nb7  1  0.701  0.045  0.734  1.0
  Sn  Sn8  1  0.694  0.306  0.250  1.0
  Sn  Sn9  1  0.306  0.694  0.750  1.0
  O  O10  1  0.004  0.828  0.544  1.0
  O  O11  1  0.172  0.996  0.956  1.0
  O  O12  1  0.996  0.172  0.456  1.0
  O  O13  1  0.828  0.004  0.044  1.0
  O  O14  1  0.309  0.553  0.116  1.0
  O  O15  1  0.447  0.691  0.384  1.0
  O  O16  1  0.691  0.447  0.884  1.0
  O  O17  1  0.553  0.309  0.616  1.0
  O  O18  1  0.920  0.696  0.953  1.0
  O  O19  1  0.304  0.080  0.547  1.0
  O  O20  1  0.450  0.157  0.882  1.0
  O  O21  1  0.843  0.550  0.618  1.0
  O  O22  1  0.550  0.843  0.118  1.0
  O  O23  1  0.157  0.450  0.382  1.0
  O  O24  1  0.696  0.920  0.453  1.0
  O  O25  1  0.080  0.304  0.047  1.0
[/CIF]
.