The material structure described by Na2Mg(BiO3)2 crystallizes in the triclinic P1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(3), and one O(5) atom. In the second Na site, Na(2) is bonded to one O(2), one O(4), one O(5), and one O(6) atom to form NaO4 trigonal pyramids that share corners with two equivalent Bi(1)O6 octahedra, corners with three equivalent Mg(1)O4 trigonal pyramids, and  an edgeedge with one Bi(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 13-47°. Mg(1) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form distorted MgO4 trigonal pyramids that share corners with two equivalent Bi(1)O6 octahedra, corners with three equivalent Na(2)O4 trigonal pyramids, and  an edgeedge with one Bi(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 23-62°. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form BiO6 octahedra that share corners with two equivalent Na(2)O4 trigonal pyramids, corners with two equivalent Mg(1)O4 trigonal pyramids,  an edgeedge with one Na(2)O4 trigonal pyramid, and  an edgeedge with one Mg(1)O4 trigonal pyramid. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a trigonal non-coplanar geometry to one Na(1), one Bi(1), and one Bi(2) atom. In the second O site, O(2) is bonded in a distorted trigonal pyramidal geometry to one Na(1), one Na(2), one Bi(1), and one Bi(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Na(1), one Mg(1), one Bi(1), and one Bi(2) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Na(2), one Mg(1), one Bi(1), and one Bi(2) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Mg(1), one Bi(1), and one Bi(2) atom. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to one Na(2), one Mg(1), one Bi(1), and one Bi(2) atom. is represented by the CIF file [CIF]
data_Na2Mg(BiO3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.364
_cell_length_b   7.251
_cell_length_c   6.259
_cell_angle_alpha   55.295
_cell_angle_beta   53.457
_cell_angle_gamma   53.046
_symmetry_Int_Tables_number   1
_cell_volume   175.070
_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  0.104  0.067  0.176  1.0
  Na  Na1  1  0.840  0.662  0.079  1.0
  Mg  Mg2  1  0.590  0.246  0.785  1.0
  Bi  Bi3  1  0.347  0.346  0.326  1.0
  Bi  Bi4  1  0.656  0.698  0.659  1.0
  O  O5  1  0.107  0.665  0.439  1.0
  O  O6  1  0.715  0.436  0.069  1.0
  O  O7  1  0.478  0.114  0.681  1.0
  O  O8  1  0.908  0.363  0.514  1.0
  O  O9  1  0.540  0.035  0.196  1.0
  O  O10  1  0.309  0.533  0.921  1.0
[/CIF]
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The material structure described by Na2Mg(BiO3)2 crystallizes in the triclinic P1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(3), and one O(5) atom. In the second Na site, Na(2) is bonded to one O(2), one O(4), one O(5), and one O(6) atom to form NaO4 trigonal pyramids that share corners with two equivalent Bi(1)O6 octahedra, corners with three equivalent Mg(1)O4 trigonal pyramids, and  an edgeedge with one Bi(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 13-47°. Mg(1) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form distorted MgO4 trigonal pyramids that share corners with two equivalent Bi(1)O6 octahedra, corners with three equivalent Na(2)O4 trigonal pyramids, and  an edgeedge with one Bi(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 23-62°. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form BiO6 octahedra that share corners with two equivalent Na(2)O4 trigonal pyramids, corners with two equivalent Mg(1)O4 trigonal pyramids,  an edgeedge with one Na(2)O4 trigonal pyramid, and  an edgeedge with one Mg(1)O4 trigonal pyramid. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a trigonal non-coplanar geometry to one Na(1), one Bi(1), and one Bi(2) atom. In the second O site, O(2) is bonded in a distorted trigonal pyramidal geometry to one Na(1), one Na(2), one Bi(1), and one Bi(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Na(1), one Mg(1), one Bi(1), and one Bi(2) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Na(2), one Mg(1), one Bi(1), and one Bi(2) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Mg(1), one Bi(1), and one Bi(2) atom. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to one Na(2), one Mg(1), one Bi(1), and one Bi(2) atom. is represented by the CIF file [CIF]
data_Na2Mg(BiO3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.364
_cell_length_b   7.251
_cell_length_c   6.259
_cell_angle_alpha   55.295
_cell_angle_beta   53.457
_cell_angle_gamma   53.046
_symmetry_Int_Tables_number   1
_cell_volume   175.070
_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  0.104  0.067  0.176  1.0
  Na  Na1  1  0.840  0.662  0.079  1.0
  Mg  Mg2  1  0.590  0.246  0.785  1.0
  Bi  Bi3  1  0.347  0.346  0.326  1.0
  Bi  Bi4  1  0.656  0.698  0.659  1.0
  O  O5  1  0.107  0.665  0.439  1.0
  O  O6  1  0.715  0.436  0.069  1.0
  O  O7  1  0.478  0.114  0.681  1.0
  O  O8  1  0.908  0.363  0.514  1.0
  O  O9  1  0.540  0.035  0.196  1.0
  O  O10  1  0.309  0.533  0.921  1.0
[/CIF]
.