The crystal structure described by Na8MgV2O8 crystallizes in the triclinic P1 space group. There are eight 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), one O(4), and one O(7) atom. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(3), one O(4), and one O(7) atom. In the third Na site, Na(3) is bonded in a 4-coordinate geometry to one O(3), one O(4), one O(5), and one O(6) atom. In the fourth Na site, Na(4) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(4), and one O(5) atom. In the fifth Na site, Na(5) is bonded in a distorted trigonal non-coplanar geometry to one O(4), one O(5), and one O(8) atom. In the sixth Na site, Na(6) is bonded in a 4-coordinate geometry to one O(5), one O(6), one O(7), and one O(8) atom. In the seventh Na site, Na(7) is bonded in a 4-coordinate geometry to one O(5), one O(6), one O(7), and one O(8) atom. In the eighth Na site, Na(8) is bonded in a 4-coordinate geometry to one O(1), one O(6), one O(7), and one O(8) atom. Mg(1) is bonded to one O(1), one O(2), one O(3), and one O(7) atom to form MgO4 tetrahedra that share  a cornercorner with one V(1)O4 tetrahedra and corners with three equivalent V(2)O4 tetrahedra. There are two inequivalent V sites. In the first V site, V(1) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form VO4 tetrahedra that share  a cornercorner with one Mg(1)O4 tetrahedra. In the second V site, V(2) is bonded to one O(1), one O(2), one O(7), and one O(8) atom to form VO4 tetrahedra that share corners with three equivalent Mg(1)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Na(1), one Na(2), one Na(4), one Na(8), one Mg(1), and one V(2) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Na(4), one Mg(1), and one V(2) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Na(3), one Na(4), one Mg(1), and one V(1) atom. In the fourth O site, O(4) is bonded to one Na(1), one Na(2), one Na(3), one Na(4), one Na(5), and one V(1) atom to form corner-sharing ONa5V octahedra. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one Na(3), one Na(4), one Na(5), one Na(6), one Na(7), and one V(1) atom. In the sixth O site, O(6) is bonded to one Na(3), one Na(6), one Na(7), one Na(8), and one V(1) atom to form corner-sharing ONa4V trigonal bipyramids. The corner-sharing octahedral tilt angles range from 43-65°. In the seventh O site, O(7) is bonded in a 7-coordinate geometry to one Na(1), one Na(2), one Na(6), one Na(7), one Na(8), one Mg(1), and one V(2) atom. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Na(5), one Na(6), one Na(7), one Na(8), and one V(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na8MgV2O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.318
_cell_length_b   5.877
_cell_length_c   5.825
_cell_angle_alpha   68.863
_cell_angle_beta   111.008
_cell_angle_gamma   94.981
_symmetry_Int_Tables_number   1
_cell_volume   277.433
_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  0.209  0.088  0.654  1.0
  Na  Na1  1  0.155  0.526  0.213  1.0
  Na  Na2  1  0.453  0.494  0.795  1.0
  Na  Na3  1  0.336  0.027  0.256  1.0
  Na  Na4  1  0.573  0.001  0.752  1.0
  Na  Na5  1  0.774  0.552  0.938  1.0
  Na  Na6  1  0.750  0.033  0.351  1.0
  Na  Na7  1  0.831  0.471  0.572  1.0
  Mg  Mg8  1  0.129  0.641  0.714  1.0
  V  V9  1  0.490  0.555  0.293  1.0
  V  V10  1  0.989  0.010  0.987  1.0
  O  O11  1  0.101  0.288  0.824  1.0
  O  O12  1  0.117  0.831  0.352  1.0
  O  O13  1  0.329  0.717  0.949  1.0
  O  O14  1  0.382  0.303  0.486  1.0
  O  O15  1  0.572  0.757  0.505  1.0
  O  O16  1  0.645  0.435  0.214  1.0
  O  O17  1  0.969  0.779  0.797  1.0
  O  O18  1  0.802  0.144  0.949  1.0
[/CIF]
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The crystal structure described by Na8MgV2O8 crystallizes in the triclinic P1 space group. There are eight 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), one O(4), and one O(7) atom. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(3), one O(4), and one O(7) atom. In the third Na site, Na(3) is bonded in a 4-coordinate geometry to one O(3), one O(4), one O(5), and one O(6) atom. In the fourth Na site, Na(4) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(4), and one O(5) atom. In the fifth Na site, Na(5) is bonded in a distorted trigonal non-coplanar geometry to one O(4), one O(5), and one O(8) atom. In the sixth Na site, Na(6) is bonded in a 4-coordinate geometry to one O(5), one O(6), one O(7), and one O(8) atom. In the seventh Na site, Na(7) is bonded in a 4-coordinate geometry to one O(5), one O(6), one O(7), and one O(8) atom. In the eighth Na site, Na(8) is bonded in a 4-coordinate geometry to one O(1), one O(6), one O(7), and one O(8) atom. Mg(1) is bonded to one O(1), one O(2), one O(3), and one O(7) atom to form MgO4 tetrahedra that share  a cornercorner with one V(1)O4 tetrahedra and corners with three equivalent V(2)O4 tetrahedra. There are two inequivalent V sites. In the first V site, V(1) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form VO4 tetrahedra that share  a cornercorner with one Mg(1)O4 tetrahedra. In the second V site, V(2) is bonded to one O(1), one O(2), one O(7), and one O(8) atom to form VO4 tetrahedra that share corners with three equivalent Mg(1)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Na(1), one Na(2), one Na(4), one Na(8), one Mg(1), and one V(2) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Na(4), one Mg(1), and one V(2) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Na(3), one Na(4), one Mg(1), and one V(1) atom. In the fourth O site, O(4) is bonded to one Na(1), one Na(2), one Na(3), one Na(4), one Na(5), and one V(1) atom to form corner-sharing ONa5V octahedra. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one Na(3), one Na(4), one Na(5), one Na(6), one Na(7), and one V(1) atom. In the sixth O site, O(6) is bonded to one Na(3), one Na(6), one Na(7), one Na(8), and one V(1) atom to form corner-sharing ONa4V trigonal bipyramids. The corner-sharing octahedral tilt angles range from 43-65°. In the seventh O site, O(7) is bonded in a 7-coordinate geometry to one Na(1), one Na(2), one Na(6), one Na(7), one Na(8), one Mg(1), and one V(2) atom. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Na(5), one Na(6), one Na(7), one Na(8), and one V(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na8MgV2O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.318
_cell_length_b   5.877
_cell_length_c   5.825
_cell_angle_alpha   68.863
_cell_angle_beta   111.008
_cell_angle_gamma   94.981
_symmetry_Int_Tables_number   1
_cell_volume   277.433
_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  0.209  0.088  0.654  1.0
  Na  Na1  1  0.155  0.526  0.213  1.0
  Na  Na2  1  0.453  0.494  0.795  1.0
  Na  Na3  1  0.336  0.027  0.256  1.0
  Na  Na4  1  0.573  0.001  0.752  1.0
  Na  Na5  1  0.774  0.552  0.938  1.0
  Na  Na6  1  0.750  0.033  0.351  1.0
  Na  Na7  1  0.831  0.471  0.572  1.0
  Mg  Mg8  1  0.129  0.641  0.714  1.0
  V  V9  1  0.490  0.555  0.293  1.0
  V  V10  1  0.989  0.010  0.987  1.0
  O  O11  1  0.101  0.288  0.824  1.0
  O  O12  1  0.117  0.831  0.352  1.0
  O  O13  1  0.329  0.717  0.949  1.0
  O  O14  1  0.382  0.303  0.486  1.0
  O  O15  1  0.572  0.757  0.505  1.0
  O  O16  1  0.645  0.435  0.214  1.0
  O  O17  1  0.969  0.779  0.797  1.0
  O  O18  1  0.802  0.144  0.949  1.0
[/CIF]
.