The crystal structure described by Na4SrGe6O15 crystallizes in the hexagonal P6_3/m space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms. In the second Na site, Na(2) is bonded to six equivalent O(2) atoms to form NaO6 octahedra that share corners with six equivalent Ge(1)O4 tetrahedra and faces with two equivalent Na(2)O6 octahedra. Sr(1) is bonded in a 9-coordinate geometry to three equivalent O(1) and six equivalent O(3) atoms. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(2), one O(4), and two equivalent O(3) atoms to form GeO4 tetrahedra that share corners with two equivalent Na(2)O6 octahedra and corners with four equivalent Ge(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-63°. In the second Ge site, Ge(2) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form GeO6 octahedra that share corners with four equivalent Ge(1)O4 tetrahedra and edges with two equivalent Ge(2)O6 octahedra. There are four inequivalent O sites. In the first O site, O(3) is bonded to one Na(1), one Sr(1), one Ge(1), and one Ge(2) atom to form a mixture of distorted corner and edge-sharing ONaSrGe2 tetrahedra. In the second O site, O(4) is bonded in a 3-coordinate geometry to one Na(1), one Ge(1), and two equivalent Ge(2) atoms. In the third O site, O(1) is bonded to one Na(1), one Sr(1), and two equivalent Ge(2) atoms to form a mixture of distorted corner and edge-sharing ONaSrGe2 trigonal pyramids. In the fourth O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Na(1), two equivalent Na(2), and one Ge(1) atom. is represented by the CIF file [CIF]
data_Na4Sr(Ge2O5)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.101
_cell_length_b   11.101
_cell_length_c   5.995
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   639.828
_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  0.162  0.286  0.750  1.0
  Na  Na1  1  0.838  0.714  0.250  1.0
  Na  Na2  1  0.714  0.876  0.750  1.0
  Na  Na3  1  0.286  0.124  0.250  1.0
  Na  Na4  1  0.124  0.838  0.750  1.0
  Na  Na5  1  0.876  0.162  0.250  1.0
  Na  Na6  1  0.000  0.000  0.500  1.0
  Na  Na7  1  0.000  0.000  0.000  1.0
  Sr  Sr8  1  0.333  0.667  0.750  1.0
  Sr  Sr9  1  0.667  0.333  0.250  1.0
  Ge  Ge10  1  0.388  0.174  0.750  1.0
  Ge  Ge11  1  0.612  0.826  0.250  1.0
  Ge  Ge12  1  0.826  0.214  0.750  1.0
  Ge  Ge13  1  0.174  0.786  0.250  1.0
  Ge  Ge14  1  0.786  0.612  0.750  1.0
  Ge  Ge15  1  0.214  0.388  0.250  1.0
  Ge  Ge16  1  0.500  0.000  0.500  1.0
  Ge  Ge17  1  0.000  0.500  0.500  1.0
  Ge  Ge18  1  0.500  0.000  0.000  1.0
  Ge  Ge19  1  0.500  0.500  0.500  1.0
  Ge  Ge20  1  0.000  0.500  0.000  1.0
  Ge  Ge21  1  0.500  0.500  0.000  1.0
  O  O22  1  0.079  0.461  0.750  1.0
  O  O23  1  0.921  0.539  0.250  1.0
  O  O24  1  0.539  0.618  0.750  1.0
  O  O25  1  0.461  0.382  0.250  1.0
  O  O26  1  0.382  0.921  0.750  1.0
  O  O27  1  0.618  0.079  0.250  1.0
  O  O28  1  0.206  0.085  0.750  1.0
  O  O29  1  0.794  0.915  0.250  1.0
  O  O30  1  0.915  0.121  0.750  1.0
  O  O31  1  0.085  0.879  0.250  1.0
  O  O32  1  0.879  0.794  0.750  1.0
  O  O33  1  0.121  0.206  0.250  1.0
  O  O34  1  0.467  0.153  0.504  1.0
  O  O35  1  0.533  0.847  0.496  1.0
  O  O36  1  0.847  0.314  0.504  1.0
  O  O37  1  0.533  0.847  0.004  1.0
  O  O38  1  0.153  0.686  0.496  1.0
  O  O39  1  0.467  0.153  0.996  1.0
  O  O40  1  0.686  0.533  0.504  1.0
  O  O41  1  0.153  0.686  0.004  1.0
  O  O42  1  0.314  0.467  0.496  1.0
  O  O43  1  0.847  0.314  0.996  1.0
  O  O44  1  0.314  0.467  0.004  1.0
  O  O45  1  0.686  0.533  0.996  1.0
  O  O46  1  0.446  0.359  0.750  1.0
  O  O47  1  0.554  0.641  0.250  1.0
  O  O48  1  0.641  0.087  0.750  1.0
  O  O49  1  0.359  0.913  0.250  1.0
  O  O50  1  0.913  0.554  0.750  1.0
  O  O51  1  0.087  0.446  0.250  1.0
[/CIF]
.
The crystal structure described by Na4SrGe6O15 crystallizes in the hexagonal P6_3/m space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms. In the second Na site, Na(2) is bonded to six equivalent O(2) atoms to form NaO6 octahedra that share corners with six equivalent Ge(1)O4 tetrahedra and faces with two equivalent Na(2)O6 octahedra. Sr(1) is bonded in a 9-coordinate geometry to three equivalent O(1) and six equivalent O(3) atoms. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(2), one O(4), and two equivalent O(3) atoms to form GeO4 tetrahedra that share corners with two equivalent Na(2)O6 octahedra and corners with four equivalent Ge(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-63°. In the second Ge site, Ge(2) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form GeO6 octahedra that share corners with four equivalent Ge(1)O4 tetrahedra and edges with two equivalent Ge(2)O6 octahedra. There are four inequivalent O sites. In the first O site, O(3) is bonded to one Na(1), one Sr(1), one Ge(1), and one Ge(2) atom to form a mixture of distorted corner and edge-sharing ONaSrGe2 tetrahedra. In the second O site, O(4) is bonded in a 3-coordinate geometry to one Na(1), one Ge(1), and two equivalent Ge(2) atoms. In the third O site, O(1) is bonded to one Na(1), one Sr(1), and two equivalent Ge(2) atoms to form a mixture of distorted corner and edge-sharing ONaSrGe2 trigonal pyramids. In the fourth O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Na(1), two equivalent Na(2), and one Ge(1) atom. is represented by the CIF file [CIF]
data_Na4Sr(Ge2O5)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.101
_cell_length_b   11.101
_cell_length_c   5.995
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   639.828
_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  0.162  0.286  0.750  1.0
  Na  Na1  1  0.838  0.714  0.250  1.0
  Na  Na2  1  0.714  0.876  0.750  1.0
  Na  Na3  1  0.286  0.124  0.250  1.0
  Na  Na4  1  0.124  0.838  0.750  1.0
  Na  Na5  1  0.876  0.162  0.250  1.0
  Na  Na6  1  0.000  0.000  0.500  1.0
  Na  Na7  1  0.000  0.000  0.000  1.0
  Sr  Sr8  1  0.333  0.667  0.750  1.0
  Sr  Sr9  1  0.667  0.333  0.250  1.0
  Ge  Ge10  1  0.388  0.174  0.750  1.0
  Ge  Ge11  1  0.612  0.826  0.250  1.0
  Ge  Ge12  1  0.826  0.214  0.750  1.0
  Ge  Ge13  1  0.174  0.786  0.250  1.0
  Ge  Ge14  1  0.786  0.612  0.750  1.0
  Ge  Ge15  1  0.214  0.388  0.250  1.0
  Ge  Ge16  1  0.500  0.000  0.500  1.0
  Ge  Ge17  1  0.000  0.500  0.500  1.0
  Ge  Ge18  1  0.500  0.000  0.000  1.0
  Ge  Ge19  1  0.500  0.500  0.500  1.0
  Ge  Ge20  1  0.000  0.500  0.000  1.0
  Ge  Ge21  1  0.500  0.500  0.000  1.0
  O  O22  1  0.079  0.461  0.750  1.0
  O  O23  1  0.921  0.539  0.250  1.0
  O  O24  1  0.539  0.618  0.750  1.0
  O  O25  1  0.461  0.382  0.250  1.0
  O  O26  1  0.382  0.921  0.750  1.0
  O  O27  1  0.618  0.079  0.250  1.0
  O  O28  1  0.206  0.085  0.750  1.0
  O  O29  1  0.794  0.915  0.250  1.0
  O  O30  1  0.915  0.121  0.750  1.0
  O  O31  1  0.085  0.879  0.250  1.0
  O  O32  1  0.879  0.794  0.750  1.0
  O  O33  1  0.121  0.206  0.250  1.0
  O  O34  1  0.467  0.153  0.504  1.0
  O  O35  1  0.533  0.847  0.496  1.0
  O  O36  1  0.847  0.314  0.504  1.0
  O  O37  1  0.533  0.847  0.004  1.0
  O  O38  1  0.153  0.686  0.496  1.0
  O  O39  1  0.467  0.153  0.996  1.0
  O  O40  1  0.686  0.533  0.504  1.0
  O  O41  1  0.153  0.686  0.004  1.0
  O  O42  1  0.314  0.467  0.496  1.0
  O  O43  1  0.847  0.314  0.996  1.0
  O  O44  1  0.314  0.467  0.004  1.0
  O  O45  1  0.686  0.533  0.996  1.0
  O  O46  1  0.446  0.359  0.750  1.0
  O  O47  1  0.554  0.641  0.250  1.0
  O  O48  1  0.641  0.087  0.750  1.0
  O  O49  1  0.359  0.913  0.250  1.0
  O  O50  1  0.913  0.554  0.750  1.0
  O  O51  1  0.087  0.446  0.250  1.0
[/CIF]
.