The material structure described by Na2Mo2O5 crystallizes in the monoclinic Cm space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 7-coordinate geometry to one O(3), one O(4), one O(5), two equivalent O(1), and two equivalent O(2) atoms. In the second Na site, Na(2) is bonded in a 7-coordinate geometry to one O(3), one O(4), one O(6), two equivalent O(1), and two equivalent O(2) atoms. There are three inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form MoO6 octahedra that share corners with four equivalent Mo(1)O6 octahedra,  a cornercorner with one Mo(3)O4 tetrahedra, and  a cornercorner with one Mo(2)O4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 4-22°. In the second Mo site, Mo(2) is bonded to one O(5), one O(6), and two equivalent O(3) atoms to form distorted MoO4 trigonal pyramids that share corners with two equivalent Mo(1)O6 octahedra and corners with two equivalent Mo(3)O4 tetrahedra. The corner-sharing octahedral tilt angles are 29°. In the third Mo site, Mo(3) is bonded to one O(5), one O(6), and two equivalent O(4) atoms to form distorted MoO4 tetrahedra that share corners with two equivalent Mo(1)O6 octahedra and corners with two equivalent Mo(2)O4 trigonal pyramids. The corner-sharing octahedral tilt angles are 42°. There are six inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Na(1), two equivalent Na(2), and two equivalent Mo(1) atoms to form distorted ONa4Mo2 octahedra that share corners with two equivalent O(1)Na4Mo2 octahedra, corners with two equivalent O(6)Na2Mo2 tetrahedra, corners with two equivalent O(5)Na2Mo2 trigonal pyramids, and edges with two equivalent O(1)Na4Mo2 octahedra. The corner-sharing octahedral tilt angles are 2°. In the second O site, O(2) is bonded in a 6-coordinate geometry to two equivalent Na(1), two equivalent Na(2), and two equivalent Mo(1) atoms. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(2), one Mo(1), and one Mo(2) atom. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Na(1), one Na(2), one Mo(1), and one Mo(3) atom. In the fifth O site, O(5) is bonded to two equivalent Na(1), one Mo(2), and one Mo(3) atom to form ONa2Mo2 trigonal pyramids that share corners with four equivalent O(1)Na4Mo2 octahedra and corners with two equivalent O(6)Na2Mo2 tetrahedra. The corner-sharing octahedral tilt angles range from 39-68°. In the sixth O site, O(6) is bonded to two equivalent Na(2), one Mo(2), and one Mo(3) atom to form distorted ONa2Mo2 tetrahedra that share corners with four equivalent O(1)Na4Mo2 octahedra and corners with two equivalent O(5)Na2Mo2 trigonal pyramids. The corner-sharing octahedral tilt angles range from 55-65°. is represented by the CIF file [CIF]
data_Na2Mo2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.545
_cell_length_b   8.545
_cell_length_c   5.642
_cell_angle_alpha   71.022
_cell_angle_beta   71.022
_cell_angle_gamma   124.150
_symmetry_Int_Tables_number   1
_cell_volume   245.352
_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
  Na  Na0  1  0.138  0.435  0.466  1.0
  Na  Na1  1  0.846  0.569  0.546  1.0
  Na  Na2  1  0.569  0.846  0.546  1.0
  Na  Na3  1  0.435  0.138  0.466  1.0
  Mo  Mo4  1  0.991  0.495  0.013  1.0
  Mo  Mo5  1  0.495  0.991  0.013  1.0
  Mo  Mo6  1  0.152  0.152  0.004  1.0
  Mo  Mo7  1  0.855  0.855  0.901  1.0
  O  O8  1  0.248  0.740  0.009  1.0
  O  O9  1  0.768  0.217  0.513  1.0
  O  O10  1  0.217  0.768  0.513  1.0
  O  O11  1  0.740  0.248  0.009  1.0
  O  O12  1  0.166  0.391  0.924  1.0
  O  O13  1  0.801  0.585  0.124  1.0
  O  O14  1  0.585  0.801  0.124  1.0
  O  O15  1  0.391  0.166  0.924  1.0
  O  O16  1  0.197  0.197  0.596  1.0
  O  O17  1  0.908  0.908  0.495  1.0
[/CIF]
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The material structure described by Na2Mo2O5 crystallizes in the monoclinic Cm space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 7-coordinate geometry to one O(3), one O(4), one O(5), two equivalent O(1), and two equivalent O(2) atoms. In the second Na site, Na(2) is bonded in a 7-coordinate geometry to one O(3), one O(4), one O(6), two equivalent O(1), and two equivalent O(2) atoms. There are three inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form MoO6 octahedra that share corners with four equivalent Mo(1)O6 octahedra,  a cornercorner with one Mo(3)O4 tetrahedra, and  a cornercorner with one Mo(2)O4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 4-22°. In the second Mo site, Mo(2) is bonded to one O(5), one O(6), and two equivalent O(3) atoms to form distorted MoO4 trigonal pyramids that share corners with two equivalent Mo(1)O6 octahedra and corners with two equivalent Mo(3)O4 tetrahedra. The corner-sharing octahedral tilt angles are 29°. In the third Mo site, Mo(3) is bonded to one O(5), one O(6), and two equivalent O(4) atoms to form distorted MoO4 tetrahedra that share corners with two equivalent Mo(1)O6 octahedra and corners with two equivalent Mo(2)O4 trigonal pyramids. The corner-sharing octahedral tilt angles are 42°. There are six inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Na(1), two equivalent Na(2), and two equivalent Mo(1) atoms to form distorted ONa4Mo2 octahedra that share corners with two equivalent O(1)Na4Mo2 octahedra, corners with two equivalent O(6)Na2Mo2 tetrahedra, corners with two equivalent O(5)Na2Mo2 trigonal pyramids, and edges with two equivalent O(1)Na4Mo2 octahedra. The corner-sharing octahedral tilt angles are 2°. In the second O site, O(2) is bonded in a 6-coordinate geometry to two equivalent Na(1), two equivalent Na(2), and two equivalent Mo(1) atoms. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(2), one Mo(1), and one Mo(2) atom. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Na(1), one Na(2), one Mo(1), and one Mo(3) atom. In the fifth O site, O(5) is bonded to two equivalent Na(1), one Mo(2), and one Mo(3) atom to form ONa2Mo2 trigonal pyramids that share corners with four equivalent O(1)Na4Mo2 octahedra and corners with two equivalent O(6)Na2Mo2 tetrahedra. The corner-sharing octahedral tilt angles range from 39-68°. In the sixth O site, O(6) is bonded to two equivalent Na(2), one Mo(2), and one Mo(3) atom to form distorted ONa2Mo2 tetrahedra that share corners with four equivalent O(1)Na4Mo2 octahedra and corners with two equivalent O(5)Na2Mo2 trigonal pyramids. The corner-sharing octahedral tilt angles range from 55-65°. is represented by the CIF file [CIF]
data_Na2Mo2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.545
_cell_length_b   8.545
_cell_length_c   5.642
_cell_angle_alpha   71.022
_cell_angle_beta   71.022
_cell_angle_gamma   124.150
_symmetry_Int_Tables_number   1
_cell_volume   245.352
_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
  Na  Na0  1  0.138  0.435  0.466  1.0
  Na  Na1  1  0.846  0.569  0.546  1.0
  Na  Na2  1  0.569  0.846  0.546  1.0
  Na  Na3  1  0.435  0.138  0.466  1.0
  Mo  Mo4  1  0.991  0.495  0.013  1.0
  Mo  Mo5  1  0.495  0.991  0.013  1.0
  Mo  Mo6  1  0.152  0.152  0.004  1.0
  Mo  Mo7  1  0.855  0.855  0.901  1.0
  O  O8  1  0.248  0.740  0.009  1.0
  O  O9  1  0.768  0.217  0.513  1.0
  O  O10  1  0.217  0.768  0.513  1.0
  O  O11  1  0.740  0.248  0.009  1.0
  O  O12  1  0.166  0.391  0.924  1.0
  O  O13  1  0.801  0.585  0.124  1.0
  O  O14  1  0.585  0.801  0.124  1.0
  O  O15  1  0.391  0.166  0.924  1.0
  O  O16  1  0.197  0.197  0.596  1.0
  O  O17  1  0.908  0.908  0.495  1.0
[/CIF]
.