The crystal structure described by Na7MgNbO6 crystallizes in the triclinic P1 space group. There are seven inequivalent Na sites. In the first Na site, Na(1) is bonded in a 3-coordinate geometry to one O(2), one O(3), and one O(4) atom. In the second Na site, Na(2) is bonded in a 3-coordinate geometry to one O(1), one O(3), and one O(6) atom. In the third Na site, Na(3) is bonded in a 3-coordinate geometry to one O(1), one O(3), and one O(6) atom. In the fourth Na site, Na(4) is bonded in a 3-coordinate geometry to one O(4), one O(5), and one O(6) atom. In the fifth Na site, Na(5) is bonded in a 4-coordinate geometry to one O(2), one O(3), one O(5), and one O(6) atom. In the sixth Na site, Na(6) is bonded in a 3-coordinate geometry to one O(1), one O(3), and one O(4) atom. In the seventh Na site, Na(7) is bonded to one O(2), one O(4), one O(5), and one O(6) atom to form distorted NaO4 tetrahedra that share corners with three equivalent Nb(1)O5 trigonal bipyramids. Mg(1) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(4), and one O(5) atom. Nb(1) is bonded to one O(1), one O(2), one O(3), one O(5), and one O(6) atom to form NbO5 trigonal bipyramids that share corners with three equivalent Na(7)O4 tetrahedra. There are six inequivalent O sites. In the first O site, O(1) is bonded to one Na(2), one Na(3), one Na(6), one Mg(1), and one Nb(1) atom to form distorted ONa3MgNb trigonal bipyramids that share  a cornercorner with one O(3)Na5Nb octahedra, corners with two equivalent O(5)Na3MgNb trigonal bipyramids,  an edgeedge with one O(4)Na4Mg square pyramid, and  a faceface with one O(3)Na5Nb octahedra. The corner-sharing octahedral tilt angles are 43°. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Na(1), one Na(5), one Na(7), and one Nb(1) atom. In the third O site, O(3) is bonded to one Na(1), one Na(2), one Na(3), one Na(5), one Na(6), and one Nb(1) atom to form distorted ONa5Nb octahedra that share corners with two equivalent O(4)Na4Mg square pyramids,  a cornercorner with one O(1)Na3MgNb trigonal bipyramid,  an edgeedge with one O(5)Na3MgNb trigonal bipyramid, and  a faceface with one O(1)Na3MgNb trigonal bipyramid. In the fourth O site, O(4) is bonded to one Na(1), one Na(4), one Na(6), one Na(7), and one Mg(1) atom to form ONa4Mg square pyramids that share corners with two equivalent O(3)Na5Nb octahedra, corners with three equivalent O(5)Na3MgNb trigonal bipyramids, and  an edgeedge with one O(1)Na3MgNb trigonal bipyramid. The corner-sharing octahedral tilt angles range from 44-48°. In the fifth O site, O(5) is bonded to one Na(4), one Na(5), one Na(7), one Mg(1), and one Nb(1) atom to form distorted ONa3MgNb trigonal bipyramids that share corners with three equivalent O(4)Na4Mg square pyramids, corners with two equivalent O(1)Na3MgNb trigonal bipyramids, and  an edgeedge with one O(3)Na5Nb octahedra. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Na(2), one Na(3), one Na(4), one Na(5), one Na(7), and one Nb(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na7MgNbO6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.364
_cell_length_b   7.497
_cell_length_c   17.799
_cell_angle_alpha   79.291
_cell_angle_beta   145.607
_cell_angle_gamma   131.299
_symmetry_Int_Tables_number   1
_cell_volume   252.944
_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
  Na  Na0  1  0.858  0.680  0.387  1.0
  Na  Na1  1  0.536  0.183  0.441  1.0
  Na  Na2  1  0.326  0.405  0.946  1.0
  Na  Na3  1  0.697  0.145  0.104  1.0
  Na  Na4  1  0.717  0.893  0.593  1.0
  Na  Na5  1  0.120  0.686  0.768  1.0
  Na  Na6  1  0.660  0.973  0.372  1.0
  Mg  Mg7  1  0.029  0.467  0.985  1.0
  Nb  Nb8  1  0.027  0.947  0.001  1.0
  O  O9  1  0.722  0.025  0.857  1.0
  O  O10  1  0.593  0.231  0.284  1.0
  O  O11  1  0.123  0.397  0.753  1.0
  O  O12  1  0.996  0.394  0.084  1.0
  O  O13  1  0.728  0.564  0.852  1.0
  O  O14  1  0.836  0.476  0.205  1.0
[/CIF]
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The crystal structure described by Na7MgNbO6 crystallizes in the triclinic P1 space group. There are seven inequivalent Na sites. In the first Na site, Na(1) is bonded in a 3-coordinate geometry to one O(2), one O(3), and one O(4) atom. In the second Na site, Na(2) is bonded in a 3-coordinate geometry to one O(1), one O(3), and one O(6) atom. In the third Na site, Na(3) is bonded in a 3-coordinate geometry to one O(1), one O(3), and one O(6) atom. In the fourth Na site, Na(4) is bonded in a 3-coordinate geometry to one O(4), one O(5), and one O(6) atom. In the fifth Na site, Na(5) is bonded in a 4-coordinate geometry to one O(2), one O(3), one O(5), and one O(6) atom. In the sixth Na site, Na(6) is bonded in a 3-coordinate geometry to one O(1), one O(3), and one O(4) atom. In the seventh Na site, Na(7) is bonded to one O(2), one O(4), one O(5), and one O(6) atom to form distorted NaO4 tetrahedra that share corners with three equivalent Nb(1)O5 trigonal bipyramids. Mg(1) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(4), and one O(5) atom. Nb(1) is bonded to one O(1), one O(2), one O(3), one O(5), and one O(6) atom to form NbO5 trigonal bipyramids that share corners with three equivalent Na(7)O4 tetrahedra. There are six inequivalent O sites. In the first O site, O(1) is bonded to one Na(2), one Na(3), one Na(6), one Mg(1), and one Nb(1) atom to form distorted ONa3MgNb trigonal bipyramids that share  a cornercorner with one O(3)Na5Nb octahedra, corners with two equivalent O(5)Na3MgNb trigonal bipyramids,  an edgeedge with one O(4)Na4Mg square pyramid, and  a faceface with one O(3)Na5Nb octahedra. The corner-sharing octahedral tilt angles are 43°. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Na(1), one Na(5), one Na(7), and one Nb(1) atom. In the third O site, O(3) is bonded to one Na(1), one Na(2), one Na(3), one Na(5), one Na(6), and one Nb(1) atom to form distorted ONa5Nb octahedra that share corners with two equivalent O(4)Na4Mg square pyramids,  a cornercorner with one O(1)Na3MgNb trigonal bipyramid,  an edgeedge with one O(5)Na3MgNb trigonal bipyramid, and  a faceface with one O(1)Na3MgNb trigonal bipyramid. In the fourth O site, O(4) is bonded to one Na(1), one Na(4), one Na(6), one Na(7), and one Mg(1) atom to form ONa4Mg square pyramids that share corners with two equivalent O(3)Na5Nb octahedra, corners with three equivalent O(5)Na3MgNb trigonal bipyramids, and  an edgeedge with one O(1)Na3MgNb trigonal bipyramid. The corner-sharing octahedral tilt angles range from 44-48°. In the fifth O site, O(5) is bonded to one Na(4), one Na(5), one Na(7), one Mg(1), and one Nb(1) atom to form distorted ONa3MgNb trigonal bipyramids that share corners with three equivalent O(4)Na4Mg square pyramids, corners with two equivalent O(1)Na3MgNb trigonal bipyramids, and  an edgeedge with one O(3)Na5Nb octahedra. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Na(2), one Na(3), one Na(4), one Na(5), one Na(7), and one Nb(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na7MgNbO6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.364
_cell_length_b   7.497
_cell_length_c   17.799
_cell_angle_alpha   79.291
_cell_angle_beta   145.607
_cell_angle_gamma   131.299
_symmetry_Int_Tables_number   1
_cell_volume   252.944
_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
  Na  Na0  1  0.858  0.680  0.387  1.0
  Na  Na1  1  0.536  0.183  0.441  1.0
  Na  Na2  1  0.326  0.405  0.946  1.0
  Na  Na3  1  0.697  0.145  0.104  1.0
  Na  Na4  1  0.717  0.893  0.593  1.0
  Na  Na5  1  0.120  0.686  0.768  1.0
  Na  Na6  1  0.660  0.973  0.372  1.0
  Mg  Mg7  1  0.029  0.467  0.985  1.0
  Nb  Nb8  1  0.027  0.947  0.001  1.0
  O  O9  1  0.722  0.025  0.857  1.0
  O  O10  1  0.593  0.231  0.284  1.0
  O  O11  1  0.123  0.397  0.753  1.0
  O  O12  1  0.996  0.394  0.084  1.0
  O  O13  1  0.728  0.564  0.852  1.0
  O  O14  1  0.836  0.476  0.205  1.0
[/CIF]
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