The material structure described by Na5AgGe2Se7 crystallizes in the monoclinic C2/c space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded to two equivalent Se(1), two equivalent Se(3), and two equivalent Se(4) atoms to form NaSe6 octahedra that share corners with two equivalent Na(2)Se6 octahedra, corners with two equivalent Ge(1)Se4 tetrahedra, edges with four equivalent Na(2)Se6 octahedra, and edges with two equivalent Ge(1)Se4 tetrahedra. The corner-sharing octahedral tilt angles are 9°. In the second Na site, Na(2) is bonded to one Se(1), one Se(2), two equivalent Se(3), and two equivalent Se(4) atoms to form distorted NaSe6 octahedra that share  a cornercorner with one Na(1)Se6 octahedra,  a cornercorner with one Na(2)Se6 octahedra,  a cornercorner with one Ge(1)Se4 tetrahedra, edges with two equivalent Na(1)Se6 octahedra, edges with two equivalent Na(2)Se6 octahedra, and edges with three equivalent Ge(1)Se4 tetrahedra. The corner-sharing octahedral tilt angles range from 9-37°. In the third Na site, Na(3) is bonded in a 4-coordinate geometry to one Se(1), one Se(3), and two equivalent Se(4) atoms. Ag(1) is bonded in a 4-coordinate geometry to two equivalent Se(1) and two equivalent Se(3) atoms. Ge(1) is bonded to one Se(1), one Se(2), one Se(3), and one Se(4) atom to form GeSe4 tetrahedra that share  a cornercorner with one Na(1)Se6 octahedra,  a cornercorner with one Na(2)Se6 octahedra,  a cornercorner with one Ge(1)Se4 tetrahedra,  an edgeedge with one Na(1)Se6 octahedra, and edges with three equivalent Na(2)Se6 octahedra. The corner-sharing octahedral tilt angles range from 16-66°. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded to one Na(1), one Na(2), one Na(3), one Ag(1), and one Ge(1) atom to form distorted SeNa3AgGe trigonal bipyramids that share corners with two equivalent Se(3)Na4AgGe octahedra, corners with five equivalent Se(4)Na5Ge octahedra, corners with two equivalent Se(1)Na3AgGe trigonal bipyramids,  an edgeedge with one Se(4)Na5Ge octahedra, and edges with three equivalent Se(3)Na4AgGe octahedra. The corner-sharing octahedral tilt angles range from 20-77°. In the second Se site, Se(2) is bonded in a 4-coordinate geometry to two equivalent Na(2) and two equivalent Ge(1) atoms. In the third Se site, Se(3) is bonded to one Na(1), one Na(3), two equivalent Na(2), one Ag(1), and one Ge(1) atom to form SeNa4AgGe octahedra that share  a cornercorner with one Se(4)Na5Ge octahedra, corners with two equivalent Se(3)Na4AgGe octahedra, corners with two equivalent Se(1)Na3AgGe trigonal bipyramids,  an edgeedge with one Se(3)Na4AgGe octahedra, edges with four equivalent Se(4)Na5Ge octahedra, and edges with three equivalent Se(1)Na3AgGe trigonal bipyramids. The corner-sharing octahedral tilt angles range from 0-70°. In the fourth Se site, Se(4) is bonded to one Na(1), two equivalent Na(2), two equivalent Na(3), and one Ge(1) atom to form SeNa5Ge octahedra that share  a cornercorner with one Se(3)Na4AgGe octahedra,  a cornercorner with one Se(4)Na5Ge octahedra, corners with five equivalent Se(1)Na3AgGe trigonal bipyramids, edges with two equivalent Se(4)Na5Ge octahedra, edges with four equivalent Se(3)Na4AgGe octahedra, and  an edgeedge with one Se(1)Na3AgGe trigonal bipyramid. The corner-sharing octahedral tilt angles range from 0-12°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na5AgGe2Se7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.333
_cell_length_b   7.333
_cell_length_c   15.468
_cell_angle_alpha   81.616
_cell_angle_beta   81.616
_cell_angle_gamma   94.415
_symmetry_Int_Tables_number   1
_cell_volume   809.962
_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  0.000  0.000  0.500  1.0
  Na  Na1  1  0.000  0.000  0.000  1.0
  Na  Na2  1  0.478  0.759  0.915  1.0
  Na  Na3  1  0.522  0.241  0.085  1.0
  Na  Na4  1  0.241  0.522  0.585  1.0
  Na  Na5  1  0.759  0.478  0.415  1.0
  Na  Na6  1  0.514  0.035  0.644  1.0
  Na  Na7  1  0.486  0.965  0.356  1.0
  Na  Na8  1  0.965  0.486  0.856  1.0
  Na  Na9  1  0.035  0.514  0.144  1.0
  Ag  Ag10  1  0.913  0.087  0.750  1.0
  Ag  Ag11  1  0.087  0.913  0.250  1.0
  Ge  Ge12  1  0.415  0.262  0.857  1.0
  Ge  Ge13  1  0.585  0.738  0.143  1.0
  Ge  Ge14  1  0.738  0.585  0.643  1.0
  Ge  Ge15  1  0.262  0.415  0.357  1.0
  Se  Se16  1  0.249  0.021  0.807  1.0
  Se  Se17  1  0.751  0.979  0.193  1.0
  Se  Se18  1  0.979  0.751  0.693  1.0
  Se  Se19  1  0.021  0.249  0.307  1.0
  Se  Se20  1  0.453  0.547  0.750  1.0
  Se  Se21  1  0.547  0.453  0.250  1.0
  Se  Se22  1  0.696  0.159  0.896  1.0
  Se  Se23  1  0.304  0.841  0.104  1.0
  Se  Se24  1  0.841  0.304  0.604  1.0
  Se  Se25  1  0.159  0.696  0.396  1.0
  Se  Se26  1  0.629  0.771  0.526  1.0
  Se  Se27  1  0.371  0.229  0.474  1.0
  Se  Se28  1  0.229  0.371  0.974  1.0
  Se  Se29  1  0.771  0.629  0.026  1.0
[/CIF]
.
The material structure described by Na5AgGe2Se7 crystallizes in the monoclinic C2/c space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded to two equivalent Se(1), two equivalent Se(3), and two equivalent Se(4) atoms to form NaSe6 octahedra that share corners with two equivalent Na(2)Se6 octahedra, corners with two equivalent Ge(1)Se4 tetrahedra, edges with four equivalent Na(2)Se6 octahedra, and edges with two equivalent Ge(1)Se4 tetrahedra. The corner-sharing octahedral tilt angles are 9°. In the second Na site, Na(2) is bonded to one Se(1), one Se(2), two equivalent Se(3), and two equivalent Se(4) atoms to form distorted NaSe6 octahedra that share  a cornercorner with one Na(1)Se6 octahedra,  a cornercorner with one Na(2)Se6 octahedra,  a cornercorner with one Ge(1)Se4 tetrahedra, edges with two equivalent Na(1)Se6 octahedra, edges with two equivalent Na(2)Se6 octahedra, and edges with three equivalent Ge(1)Se4 tetrahedra. The corner-sharing octahedral tilt angles range from 9-37°. In the third Na site, Na(3) is bonded in a 4-coordinate geometry to one Se(1), one Se(3), and two equivalent Se(4) atoms. Ag(1) is bonded in a 4-coordinate geometry to two equivalent Se(1) and two equivalent Se(3) atoms. Ge(1) is bonded to one Se(1), one Se(2), one Se(3), and one Se(4) atom to form GeSe4 tetrahedra that share  a cornercorner with one Na(1)Se6 octahedra,  a cornercorner with one Na(2)Se6 octahedra,  a cornercorner with one Ge(1)Se4 tetrahedra,  an edgeedge with one Na(1)Se6 octahedra, and edges with three equivalent Na(2)Se6 octahedra. The corner-sharing octahedral tilt angles range from 16-66°. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded to one Na(1), one Na(2), one Na(3), one Ag(1), and one Ge(1) atom to form distorted SeNa3AgGe trigonal bipyramids that share corners with two equivalent Se(3)Na4AgGe octahedra, corners with five equivalent Se(4)Na5Ge octahedra, corners with two equivalent Se(1)Na3AgGe trigonal bipyramids,  an edgeedge with one Se(4)Na5Ge octahedra, and edges with three equivalent Se(3)Na4AgGe octahedra. The corner-sharing octahedral tilt angles range from 20-77°. In the second Se site, Se(2) is bonded in a 4-coordinate geometry to two equivalent Na(2) and two equivalent Ge(1) atoms. In the third Se site, Se(3) is bonded to one Na(1), one Na(3), two equivalent Na(2), one Ag(1), and one Ge(1) atom to form SeNa4AgGe octahedra that share  a cornercorner with one Se(4)Na5Ge octahedra, corners with two equivalent Se(3)Na4AgGe octahedra, corners with two equivalent Se(1)Na3AgGe trigonal bipyramids,  an edgeedge with one Se(3)Na4AgGe octahedra, edges with four equivalent Se(4)Na5Ge octahedra, and edges with three equivalent Se(1)Na3AgGe trigonal bipyramids. The corner-sharing octahedral tilt angles range from 0-70°. In the fourth Se site, Se(4) is bonded to one Na(1), two equivalent Na(2), two equivalent Na(3), and one Ge(1) atom to form SeNa5Ge octahedra that share  a cornercorner with one Se(3)Na4AgGe octahedra,  a cornercorner with one Se(4)Na5Ge octahedra, corners with five equivalent Se(1)Na3AgGe trigonal bipyramids, edges with two equivalent Se(4)Na5Ge octahedra, edges with four equivalent Se(3)Na4AgGe octahedra, and  an edgeedge with one Se(1)Na3AgGe trigonal bipyramid. The corner-sharing octahedral tilt angles range from 0-12°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na5AgGe2Se7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.333
_cell_length_b   7.333
_cell_length_c   15.468
_cell_angle_alpha   81.616
_cell_angle_beta   81.616
_cell_angle_gamma   94.415
_symmetry_Int_Tables_number   1
_cell_volume   809.962
_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  0.000  0.000  0.500  1.0
  Na  Na1  1  0.000  0.000  0.000  1.0
  Na  Na2  1  0.478  0.759  0.915  1.0
  Na  Na3  1  0.522  0.241  0.085  1.0
  Na  Na4  1  0.241  0.522  0.585  1.0
  Na  Na5  1  0.759  0.478  0.415  1.0
  Na  Na6  1  0.514  0.035  0.644  1.0
  Na  Na7  1  0.486  0.965  0.356  1.0
  Na  Na8  1  0.965  0.486  0.856  1.0
  Na  Na9  1  0.035  0.514  0.144  1.0
  Ag  Ag10  1  0.913  0.087  0.750  1.0
  Ag  Ag11  1  0.087  0.913  0.250  1.0
  Ge  Ge12  1  0.415  0.262  0.857  1.0
  Ge  Ge13  1  0.585  0.738  0.143  1.0
  Ge  Ge14  1  0.738  0.585  0.643  1.0
  Ge  Ge15  1  0.262  0.415  0.357  1.0
  Se  Se16  1  0.249  0.021  0.807  1.0
  Se  Se17  1  0.751  0.979  0.193  1.0
  Se  Se18  1  0.979  0.751  0.693  1.0
  Se  Se19  1  0.021  0.249  0.307  1.0
  Se  Se20  1  0.453  0.547  0.750  1.0
  Se  Se21  1  0.547  0.453  0.250  1.0
  Se  Se22  1  0.696  0.159  0.896  1.0
  Se  Se23  1  0.304  0.841  0.104  1.0
  Se  Se24  1  0.841  0.304  0.604  1.0
  Se  Se25  1  0.159  0.696  0.396  1.0
  Se  Se26  1  0.629  0.771  0.526  1.0
  Se  Se27  1  0.371  0.229  0.474  1.0
  Se  Se28  1  0.229  0.371  0.974  1.0
  Se  Se29  1  0.771  0.629  0.026  1.0
[/CIF]
.