The compound described by Na4MgV4O10 crystallizes in the triclinic P1 space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(7), and one O(9) atom. In the second Na site, Na(2) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(2), one O(3), one O(4), one O(8), and two equivalent O(6) atoms. In the third Na site, Na(3) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(2), one O(3), one O(4), one O(5), and two equivalent O(7) atoms. In the fourth Na site, Na(4) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(6), one O(8), and one O(9) atom. Mg(1) is bonded to one O(5), one O(6), one O(7), one O(8), and one O(9) atom to form distorted MgO5 square pyramids that share corners with two equivalent V(1)O6 octahedra, corners with two equivalent V(2)O6 octahedra,  a cornercorner with one V(3)O4 tetrahedra,  a cornercorner with one V(4)O4 tetrahedra,  an edgeedge with one V(3)O4 tetrahedra, and  an edgeedge with one V(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 33-37°. There are four inequivalent V sites. In the first V site, V(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 VO6 octahedra that share corners with four equivalent V(2)O6 octahedra, corners with two equivalent Mg(1)O5 square pyramids,  a cornercorner with one V(3)O4 tetrahedra, and  a cornercorner with one V(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 4-20°. In the second V site, V(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom to form VO6 octahedra that share corners with four equivalent V(1)O6 octahedra, corners with two equivalent Mg(1)O5 square pyramids,  a cornercorner with one V(3)O4 tetrahedra, and  a cornercorner with one V(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 4-20°. In the third V site, V(3) is bonded to one O(10), one O(5), one O(8), and one O(9) atom to form VO4 tetrahedra that share  a cornercorner with one V(1)O6 octahedra,  a cornercorner with one V(2)O6 octahedra,  a cornercorner with one Mg(1)O5 square pyramid, corners with two equivalent V(4)O4 tetrahedra, and  an edgeedge with one Mg(1)O5 square pyramid. The corner-sharing octahedral tilt angles range from 56-57°. In the fourth V site, V(4) is bonded to one O(10), one O(6), one O(7), and one O(9) atom to form distorted VO4 tetrahedra that share  a cornercorner with one V(1)O6 octahedra,  a cornercorner with one V(2)O6 octahedra,  a cornercorner with one Mg(1)O5 square pyramid, corners with two equivalent V(3)O4 tetrahedra, and  an edgeedge with one Mg(1)O5 square pyramid. The corner-sharing octahedral tilt angles range from 50-51°. There are ten 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(3), one Na(4), one V(1), and one V(2) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Na(1), one Na(2), one Na(3), one Na(4), one V(1), and one V(2) atom. In the third O site, O(3) is bonded to one Na(1), one Na(2), one Na(3), one Na(4), one V(1), and one V(2) atom to form distorted ONa4V2 octahedra that share corners with two equivalent O(10)Na2V2 tetrahedra and corners with two equivalent O(9)Na2MgV2 trigonal bipyramids. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Na(1), one Na(2), one Na(3), one Na(4), one V(1), and one V(2) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Na(1), one Na(3), one Mg(1), one V(1), and one V(3) atom. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Na(4), two equivalent Na(2), one Mg(1), one V(1), and one V(4) atom. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to one Na(1), two equivalent Na(3), one Mg(1), one V(2), and one V(4) atom. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Na(2), one Na(4), one Mg(1), one V(2), and one V(3) atom. In the ninth O site, O(9) is bonded to one Na(1), one Na(4), one Mg(1), one V(3), and one V(4) atom to form distorted ONa2MgV2 trigonal bipyramids that share corners with two equivalent O(3)Na4V2 octahedra and corners with two equivalent O(10)Na2V2 tetrahedra. The corner-sharing octahedral tilt angles range from 56-65°. In the tenth O site, O(10) is bonded to one Na(2), one Na(3), one V(3), and one V(4) atom to form ONa2V2 tetrahedra that share corners with two equivalent O(3)Na4V2 octahedra and corners with two equivalent O(9)Na2MgV2 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 26-83°. is represented by the CIF card [CIF]
data_Na4MgV4O10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.530
_cell_length_b   5.739
_cell_length_c   8.055
_cell_angle_alpha   110.922
_cell_angle_beta   109.977
_cell_angle_gamma   90.175
_symmetry_Int_Tables_number   1
_cell_volume   222.107
_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  0.602  0.104  0.173  1.0
  Na  Na1  1  0.391  0.842  0.783  1.0
  Na  Na2  1  0.109  0.560  0.215  1.0
  Na  Na3  1  0.931  0.434  0.827  1.0
  Mg  Mg4  1  0.579  0.448  0.501  1.0
  V  V5  1  0.016  0.995  0.996  1.0
  V  V6  1  0.520  0.488  0.002  1.0
  V  V7  1  0.176  0.155  0.497  1.0
  V  V8  1  0.669  0.890  0.499  1.0
  O  O9  1  0.241  0.206  0.954  1.0
  O  O10  1  0.298  0.728  0.009  1.0
  O  O11  1  0.759  0.250  0.990  1.0
  O  O12  1  0.822  0.788  0.050  1.0
  O  O13  1  0.239  0.211  0.297  1.0
  O  O14  1  0.838  0.782  0.705  1.0
  O  O15  1  0.636  0.575  0.297  1.0
  O  O16  1  0.439  0.411  0.704  1.0
  O  O17  1  0.828  0.191  0.501  1.0
  O  O18  1  0.323  0.858  0.500  1.0
[/CIF]
.
The compound described by Na4MgV4O10 crystallizes in the triclinic P1 space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(7), and one O(9) atom. In the second Na site, Na(2) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(2), one O(3), one O(4), one O(8), and two equivalent O(6) atoms. In the third Na site, Na(3) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(2), one O(3), one O(4), one O(5), and two equivalent O(7) atoms. In the fourth Na site, Na(4) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(6), one O(8), and one O(9) atom. Mg(1) is bonded to one O(5), one O(6), one O(7), one O(8), and one O(9) atom to form distorted MgO5 square pyramids that share corners with two equivalent V(1)O6 octahedra, corners with two equivalent V(2)O6 octahedra,  a cornercorner with one V(3)O4 tetrahedra,  a cornercorner with one V(4)O4 tetrahedra,  an edgeedge with one V(3)O4 tetrahedra, and  an edgeedge with one V(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 33-37°. There are four inequivalent V sites. In the first V site, V(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 VO6 octahedra that share corners with four equivalent V(2)O6 octahedra, corners with two equivalent Mg(1)O5 square pyramids,  a cornercorner with one V(3)O4 tetrahedra, and  a cornercorner with one V(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 4-20°. In the second V site, V(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom to form VO6 octahedra that share corners with four equivalent V(1)O6 octahedra, corners with two equivalent Mg(1)O5 square pyramids,  a cornercorner with one V(3)O4 tetrahedra, and  a cornercorner with one V(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 4-20°. In the third V site, V(3) is bonded to one O(10), one O(5), one O(8), and one O(9) atom to form VO4 tetrahedra that share  a cornercorner with one V(1)O6 octahedra,  a cornercorner with one V(2)O6 octahedra,  a cornercorner with one Mg(1)O5 square pyramid, corners with two equivalent V(4)O4 tetrahedra, and  an edgeedge with one Mg(1)O5 square pyramid. The corner-sharing octahedral tilt angles range from 56-57°. In the fourth V site, V(4) is bonded to one O(10), one O(6), one O(7), and one O(9) atom to form distorted VO4 tetrahedra that share  a cornercorner with one V(1)O6 octahedra,  a cornercorner with one V(2)O6 octahedra,  a cornercorner with one Mg(1)O5 square pyramid, corners with two equivalent V(3)O4 tetrahedra, and  an edgeedge with one Mg(1)O5 square pyramid. The corner-sharing octahedral tilt angles range from 50-51°. There are ten 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(3), one Na(4), one V(1), and one V(2) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Na(1), one Na(2), one Na(3), one Na(4), one V(1), and one V(2) atom. In the third O site, O(3) is bonded to one Na(1), one Na(2), one Na(3), one Na(4), one V(1), and one V(2) atom to form distorted ONa4V2 octahedra that share corners with two equivalent O(10)Na2V2 tetrahedra and corners with two equivalent O(9)Na2MgV2 trigonal bipyramids. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Na(1), one Na(2), one Na(3), one Na(4), one V(1), and one V(2) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Na(1), one Na(3), one Mg(1), one V(1), and one V(3) atom. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Na(4), two equivalent Na(2), one Mg(1), one V(1), and one V(4) atom. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to one Na(1), two equivalent Na(3), one Mg(1), one V(2), and one V(4) atom. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Na(2), one Na(4), one Mg(1), one V(2), and one V(3) atom. In the ninth O site, O(9) is bonded to one Na(1), one Na(4), one Mg(1), one V(3), and one V(4) atom to form distorted ONa2MgV2 trigonal bipyramids that share corners with two equivalent O(3)Na4V2 octahedra and corners with two equivalent O(10)Na2V2 tetrahedra. The corner-sharing octahedral tilt angles range from 56-65°. In the tenth O site, O(10) is bonded to one Na(2), one Na(3), one V(3), and one V(4) atom to form ONa2V2 tetrahedra that share corners with two equivalent O(3)Na4V2 octahedra and corners with two equivalent O(9)Na2MgV2 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 26-83°. is represented by the CIF card [CIF]
data_Na4MgV4O10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.530
_cell_length_b   5.739
_cell_length_c   8.055
_cell_angle_alpha   110.922
_cell_angle_beta   109.977
_cell_angle_gamma   90.175
_symmetry_Int_Tables_number   1
_cell_volume   222.107
_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  0.602  0.104  0.173  1.0
  Na  Na1  1  0.391  0.842  0.783  1.0
  Na  Na2  1  0.109  0.560  0.215  1.0
  Na  Na3  1  0.931  0.434  0.827  1.0
  Mg  Mg4  1  0.579  0.448  0.501  1.0
  V  V5  1  0.016  0.995  0.996  1.0
  V  V6  1  0.520  0.488  0.002  1.0
  V  V7  1  0.176  0.155  0.497  1.0
  V  V8  1  0.669  0.890  0.499  1.0
  O  O9  1  0.241  0.206  0.954  1.0
  O  O10  1  0.298  0.728  0.009  1.0
  O  O11  1  0.759  0.250  0.990  1.0
  O  O12  1  0.822  0.788  0.050  1.0
  O  O13  1  0.239  0.211  0.297  1.0
  O  O14  1  0.838  0.782  0.705  1.0
  O  O15  1  0.636  0.575  0.297  1.0
  O  O16  1  0.439  0.411  0.704  1.0
  O  O17  1  0.828  0.191  0.501  1.0
  O  O18  1  0.323  0.858  0.500  1.0
[/CIF]
.