The structure described by Na4MgTi2(GeO5)2 crystallizes in the monoclinic Cm space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one O(5), two equivalent O(2), and two equivalent O(3) atoms. In the second Na site, Na(2) is bonded to one O(1), one O(2), one O(3), one O(4), and one O(6) atom to form distorted NaO5 square pyramids that share  a cornercorner with one Na(2)O5 square pyramid, corners with two equivalent Na(3)O5 square pyramids, corners with four equivalent Ge(1)O4 tetrahedra, and corners with three equivalent Mg(1)O5 trigonal bipyramids. In the third Na site, Na(3) is bonded to one O(5), two equivalent O(1), and two equivalent O(4) atoms to form distorted NaO5 square pyramids that share corners with four equivalent Na(2)O5 square pyramids and corners with four equivalent Ge(1)O4 tetrahedra. Mg(1) is bonded to one O(6), two equivalent O(2), and two equivalent O(3) atoms to form distorted MgO5 trigonal bipyramids that share corners with six equivalent Na(2)O5 square pyramids and edges with two equivalent Ge(1)O4 tetrahedra. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded in a 5-coordinate geometry to one O(6), two equivalent O(1), and two equivalent O(2) atoms. In the second Ti site, Ti(2) is bonded in a 5-coordinate geometry to one O(5), two equivalent O(3), and two equivalent O(4) atoms. Ge(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form GeO4 tetrahedra that share corners with two equivalent Na(3)O5 square pyramids, corners with four equivalent Na(2)O5 square pyramids, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Na(2), one Na(3), one Ti(1), and one Ge(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Mg(1), one Ti(1), and one Ge(1) atom. In the third O site, O(3) is bonded to one Na(1), one Na(2), one Mg(1), one Ti(2), and one Ge(1) atom to form distorted ONa2MgTiGe square pyramids that share corners with two equivalent O(4)Na2TiGe tetrahedra,  an edgeedge with one O(4)Na2TiGe tetrahedra, and  a faceface with one O(3)Na2MgTiGe square pyramid. In the fourth O site, O(4) is bonded to one Na(2), one Na(3), one Ti(2), and one Ge(1) atom to form distorted ONa2TiGe tetrahedra that share corners with two equivalent O(3)Na2MgTiGe square pyramids,  an edgeedge with one O(3)Na2MgTiGe square pyramid, and  an edgeedge with one O(4)Na2TiGe tetrahedra. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Na(1), one Na(3), and one Ti(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to two equivalent Na(2), one Mg(1), and one Ti(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na4MgTi2(GeO5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.347
_cell_length_b   7.014
_cell_length_c   7.013
_cell_angle_alpha   91.290
_cell_angle_beta   91.546
_cell_angle_gamma   91.545
_symmetry_Int_Tables_number   1
_cell_volume   262.743
_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  0.917  0.049  0.049  1.0
  Na  Na1  1  0.023  0.524  0.985  1.0
  Na  Na2  1  0.991  0.479  0.478  1.0
  Na  Na3  1  0.024  0.985  0.523  1.0
  Mg  Mg4  1  0.396  0.959  0.958  1.0
  Ti  Ti5  1  0.591  0.720  0.720  1.0
  Ti  Ti6  1  0.430  0.259  0.258  1.0
  Ge  Ge7  1  0.499  0.256  0.735  1.0
  Ge  Ge8  1  0.499  0.736  0.256  1.0
  O  O9  1  0.710  0.746  0.457  1.0
  O  O10  1  0.668  0.764  0.037  1.0
  O  O11  1  0.710  0.458  0.746  1.0
  O  O12  1  0.668  0.037  0.763  1.0
  O  O13  1  0.308  0.951  0.233  1.0
  O  O14  1  0.308  0.234  0.950  1.0
  O  O15  1  0.300  0.248  0.530  1.0
  O  O16  1  0.300  0.530  0.248  1.0
  O  O17  1  0.757  0.260  0.260  1.0
  O  O18  1  0.261  0.765  0.764  1.0
[/CIF]
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The structure described by Na4MgTi2(GeO5)2 crystallizes in the monoclinic Cm space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one O(5), two equivalent O(2), and two equivalent O(3) atoms. In the second Na site, Na(2) is bonded to one O(1), one O(2), one O(3), one O(4), and one O(6) atom to form distorted NaO5 square pyramids that share  a cornercorner with one Na(2)O5 square pyramid, corners with two equivalent Na(3)O5 square pyramids, corners with four equivalent Ge(1)O4 tetrahedra, and corners with three equivalent Mg(1)O5 trigonal bipyramids. In the third Na site, Na(3) is bonded to one O(5), two equivalent O(1), and two equivalent O(4) atoms to form distorted NaO5 square pyramids that share corners with four equivalent Na(2)O5 square pyramids and corners with four equivalent Ge(1)O4 tetrahedra. Mg(1) is bonded to one O(6), two equivalent O(2), and two equivalent O(3) atoms to form distorted MgO5 trigonal bipyramids that share corners with six equivalent Na(2)O5 square pyramids and edges with two equivalent Ge(1)O4 tetrahedra. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded in a 5-coordinate geometry to one O(6), two equivalent O(1), and two equivalent O(2) atoms. In the second Ti site, Ti(2) is bonded in a 5-coordinate geometry to one O(5), two equivalent O(3), and two equivalent O(4) atoms. Ge(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form GeO4 tetrahedra that share corners with two equivalent Na(3)O5 square pyramids, corners with four equivalent Na(2)O5 square pyramids, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Na(2), one Na(3), one Ti(1), and one Ge(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Mg(1), one Ti(1), and one Ge(1) atom. In the third O site, O(3) is bonded to one Na(1), one Na(2), one Mg(1), one Ti(2), and one Ge(1) atom to form distorted ONa2MgTiGe square pyramids that share corners with two equivalent O(4)Na2TiGe tetrahedra,  an edgeedge with one O(4)Na2TiGe tetrahedra, and  a faceface with one O(3)Na2MgTiGe square pyramid. In the fourth O site, O(4) is bonded to one Na(2), one Na(3), one Ti(2), and one Ge(1) atom to form distorted ONa2TiGe tetrahedra that share corners with two equivalent O(3)Na2MgTiGe square pyramids,  an edgeedge with one O(3)Na2MgTiGe square pyramid, and  an edgeedge with one O(4)Na2TiGe tetrahedra. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Na(1), one Na(3), and one Ti(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to two equivalent Na(2), one Mg(1), and one Ti(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na4MgTi2(GeO5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.347
_cell_length_b   7.014
_cell_length_c   7.013
_cell_angle_alpha   91.290
_cell_angle_beta   91.546
_cell_angle_gamma   91.545
_symmetry_Int_Tables_number   1
_cell_volume   262.743
_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  0.917  0.049  0.049  1.0
  Na  Na1  1  0.023  0.524  0.985  1.0
  Na  Na2  1  0.991  0.479  0.478  1.0
  Na  Na3  1  0.024  0.985  0.523  1.0
  Mg  Mg4  1  0.396  0.959  0.958  1.0
  Ti  Ti5  1  0.591  0.720  0.720  1.0
  Ti  Ti6  1  0.430  0.259  0.258  1.0
  Ge  Ge7  1  0.499  0.256  0.735  1.0
  Ge  Ge8  1  0.499  0.736  0.256  1.0
  O  O9  1  0.710  0.746  0.457  1.0
  O  O10  1  0.668  0.764  0.037  1.0
  O  O11  1  0.710  0.458  0.746  1.0
  O  O12  1  0.668  0.037  0.763  1.0
  O  O13  1  0.308  0.951  0.233  1.0
  O  O14  1  0.308  0.234  0.950  1.0
  O  O15  1  0.300  0.248  0.530  1.0
  O  O16  1  0.300  0.530  0.248  1.0
  O  O17  1  0.757  0.260  0.260  1.0
  O  O18  1  0.261  0.765  0.764  1.0
[/CIF]
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