The crystal structure described by NaSr2Nb5O15 crystallizes in the orthorhombic Cmm2 space group. Na(1) is bonded in a 3-coordinate geometry to one O(1) and two equivalent O(6) atoms. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 11-coordinate geometry to one O(10), two equivalent O(2), two equivalent O(3), two equivalent O(7), and four equivalent O(5) atoms. In the second Sr site, Sr(2) is bonded to two equivalent O(3), two equivalent O(4), four equivalent O(7), and four equivalent O(8) atoms to form SrO12 cuboctahedra that share faces with two equivalent Sr(2)O12 cuboctahedra, faces with four equivalent Nb(1)O6 octahedra, and faces with four equivalent Nb(2)O6 octahedra. There are four inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(2), one O(6), one O(7), one O(8), and two equivalent O(3) atoms to form distorted NbO6 octahedra that share  a cornercorner with one Nb(3)O6 octahedra, corners with two equivalent Nb(2)O6 octahedra, corners with three equivalent Nb(1)O6 octahedra, and faces with two equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 10-47°. In the second Nb site, Nb(2) is bonded to one O(1), one O(5), one O(7), one O(8), and two equivalent O(4) atoms to form NbO6 octahedra that share  a cornercorner with one Nb(4)O6 octahedra, corners with two equivalent Nb(1)O6 octahedra, corners with three equivalent Nb(2)O6 octahedra, and faces with two equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 7-39°. In the third Nb site, Nb(3) is bonded to two equivalent O(9) and four equivalent O(6) atoms to form distorted corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 0-34°. In the fourth Nb site, Nb(4) is bonded to two equivalent O(10) and four equivalent O(5) atoms to form distorted corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 0-38°. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Na(1) and two equivalent Nb(2) atoms. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Sr(1) and two equivalent Nb(1) atoms. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), and two equivalent Nb(1) atoms. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Sr(2) and two equivalent Nb(2) atoms. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to two equivalent Sr(1), one Nb(2), and one Nb(4) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Na(1), one Nb(1), and one Nb(3) atom. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to one Sr(1), two equivalent Sr(2), one Nb(1), and one Nb(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to two equivalent Sr(2), one Nb(1), and one Nb(2) atom. In the ninth O site, O(9) is bonded in a distorted linear geometry to two equivalent Nb(3) atoms. In the tenth O site, O(10) is bonded in a distorted linear geometry to two equivalent Sr(1) and two equivalent Nb(4) atoms. is represented by the CIF file [CIF]
data_NaSr2Nb5O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.623
_cell_length_b   12.623
_cell_length_c   4.079
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.053
_symmetry_Int_Tables_number   1
_cell_volume   649.864
_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  0.329  0.329  0.992  1.0
  Na  Na1  1  0.671  0.671  0.992  1.0
  Sr  Sr2  1  0.827  0.173  0.002  1.0
  Sr  Sr3  1  0.173  0.827  0.002  1.0
  Sr  Sr4  1  0.500  0.000  0.045  1.0
  Sr  Sr5  1  0.000  0.500  0.045  1.0
  Nb  Nb6  1  0.424  0.788  0.538  1.0
  Nb  Nb7  1  0.576  0.212  0.538  1.0
  Nb  Nb8  1  0.922  0.711  0.538  1.0
  Nb  Nb9  1  0.078  0.289  0.538  1.0
  Nb  Nb10  1  0.711  0.922  0.538  1.0
  Nb  Nb11  1  0.289  0.078  0.538  1.0
  Nb  Nb12  1  0.788  0.424  0.538  1.0
  Nb  Nb13  1  0.212  0.576  0.538  1.0
  Nb  Nb14  1  0.500  0.500  0.523  1.0
  Nb  Nb15  1  0.000  0.000  0.526  1.0
  O  O16  1  0.219  0.219  0.592  1.0
  O  O17  1  0.781  0.781  0.592  1.0
  O  O18  1  0.727  0.273  0.582  1.0
  O  O19  1  0.273  0.727  0.582  1.0
  O  O20  1  0.415  0.800  0.081  1.0
  O  O21  1  0.585  0.200  0.081  1.0
  O  O22  1  0.923  0.701  0.082  1.0
  O  O23  1  0.077  0.299  0.082  1.0
  O  O24  1  0.701  0.923  0.082  1.0
  O  O25  1  0.299  0.077  0.082  1.0
  O  O26  1  0.800  0.415  0.081  1.0
  O  O27  1  0.200  0.585  0.081  1.0
  O  O28  1  0.157  0.992  0.589  1.0
  O  O29  1  0.843  0.008  0.589  1.0
  O  O30  1  0.658  0.502  0.587  1.0
  O  O31  1  0.342  0.498  0.587  1.0
  O  O32  1  0.502  0.658  0.587  1.0
  O  O33  1  0.498  0.342  0.587  1.0
  O  O34  1  0.992  0.157  0.589  1.0
  O  O35  1  0.008  0.843  0.589  1.0
  O  O36  1  0.361  0.936  0.594  1.0
  O  O37  1  0.639  0.064  0.594  1.0
  O  O38  1  0.866  0.562  0.586  1.0
  O  O39  1  0.134  0.438  0.586  1.0
  O  O40  1  0.562  0.866  0.586  1.0
  O  O41  1  0.438  0.134  0.586  1.0
  O  O42  1  0.936  0.361  0.594  1.0
  O  O43  1  0.064  0.639  0.594  1.0
  O  O44  1  0.500  0.500  0.076  1.0
  O  O45  1  0.000  0.000  0.074  1.0
[/CIF]
.
The crystal structure described by NaSr2Nb5O15 crystallizes in the orthorhombic Cmm2 space group. Na(1) is bonded in a 3-coordinate geometry to one O(1) and two equivalent O(6) atoms. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 11-coordinate geometry to one O(10), two equivalent O(2), two equivalent O(3), two equivalent O(7), and four equivalent O(5) atoms. In the second Sr site, Sr(2) is bonded to two equivalent O(3), two equivalent O(4), four equivalent O(7), and four equivalent O(8) atoms to form SrO12 cuboctahedra that share faces with two equivalent Sr(2)O12 cuboctahedra, faces with four equivalent Nb(1)O6 octahedra, and faces with four equivalent Nb(2)O6 octahedra. There are four inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(2), one O(6), one O(7), one O(8), and two equivalent O(3) atoms to form distorted NbO6 octahedra that share  a cornercorner with one Nb(3)O6 octahedra, corners with two equivalent Nb(2)O6 octahedra, corners with three equivalent Nb(1)O6 octahedra, and faces with two equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 10-47°. In the second Nb site, Nb(2) is bonded to one O(1), one O(5), one O(7), one O(8), and two equivalent O(4) atoms to form NbO6 octahedra that share  a cornercorner with one Nb(4)O6 octahedra, corners with two equivalent Nb(1)O6 octahedra, corners with three equivalent Nb(2)O6 octahedra, and faces with two equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 7-39°. In the third Nb site, Nb(3) is bonded to two equivalent O(9) and four equivalent O(6) atoms to form distorted corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 0-34°. In the fourth Nb site, Nb(4) is bonded to two equivalent O(10) and four equivalent O(5) atoms to form distorted corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 0-38°. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Na(1) and two equivalent Nb(2) atoms. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Sr(1) and two equivalent Nb(1) atoms. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), and two equivalent Nb(1) atoms. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Sr(2) and two equivalent Nb(2) atoms. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to two equivalent Sr(1), one Nb(2), and one Nb(4) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Na(1), one Nb(1), and one Nb(3) atom. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to one Sr(1), two equivalent Sr(2), one Nb(1), and one Nb(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to two equivalent Sr(2), one Nb(1), and one Nb(2) atom. In the ninth O site, O(9) is bonded in a distorted linear geometry to two equivalent Nb(3) atoms. In the tenth O site, O(10) is bonded in a distorted linear geometry to two equivalent Sr(1) and two equivalent Nb(4) atoms. is represented by the CIF file [CIF]
data_NaSr2Nb5O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.623
_cell_length_b   12.623
_cell_length_c   4.079
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.053
_symmetry_Int_Tables_number   1
_cell_volume   649.864
_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  0.329  0.329  0.992  1.0
  Na  Na1  1  0.671  0.671  0.992  1.0
  Sr  Sr2  1  0.827  0.173  0.002  1.0
  Sr  Sr3  1  0.173  0.827  0.002  1.0
  Sr  Sr4  1  0.500  0.000  0.045  1.0
  Sr  Sr5  1  0.000  0.500  0.045  1.0
  Nb  Nb6  1  0.424  0.788  0.538  1.0
  Nb  Nb7  1  0.576  0.212  0.538  1.0
  Nb  Nb8  1  0.922  0.711  0.538  1.0
  Nb  Nb9  1  0.078  0.289  0.538  1.0
  Nb  Nb10  1  0.711  0.922  0.538  1.0
  Nb  Nb11  1  0.289  0.078  0.538  1.0
  Nb  Nb12  1  0.788  0.424  0.538  1.0
  Nb  Nb13  1  0.212  0.576  0.538  1.0
  Nb  Nb14  1  0.500  0.500  0.523  1.0
  Nb  Nb15  1  0.000  0.000  0.526  1.0
  O  O16  1  0.219  0.219  0.592  1.0
  O  O17  1  0.781  0.781  0.592  1.0
  O  O18  1  0.727  0.273  0.582  1.0
  O  O19  1  0.273  0.727  0.582  1.0
  O  O20  1  0.415  0.800  0.081  1.0
  O  O21  1  0.585  0.200  0.081  1.0
  O  O22  1  0.923  0.701  0.082  1.0
  O  O23  1  0.077  0.299  0.082  1.0
  O  O24  1  0.701  0.923  0.082  1.0
  O  O25  1  0.299  0.077  0.082  1.0
  O  O26  1  0.800  0.415  0.081  1.0
  O  O27  1  0.200  0.585  0.081  1.0
  O  O28  1  0.157  0.992  0.589  1.0
  O  O29  1  0.843  0.008  0.589  1.0
  O  O30  1  0.658  0.502  0.587  1.0
  O  O31  1  0.342  0.498  0.587  1.0
  O  O32  1  0.502  0.658  0.587  1.0
  O  O33  1  0.498  0.342  0.587  1.0
  O  O34  1  0.992  0.157  0.589  1.0
  O  O35  1  0.008  0.843  0.589  1.0
  O  O36  1  0.361  0.936  0.594  1.0
  O  O37  1  0.639  0.064  0.594  1.0
  O  O38  1  0.866  0.562  0.586  1.0
  O  O39  1  0.134  0.438  0.586  1.0
  O  O40  1  0.562  0.866  0.586  1.0
  O  O41  1  0.438  0.134  0.586  1.0
  O  O42  1  0.936  0.361  0.594  1.0
  O  O43  1  0.064  0.639  0.594  1.0
  O  O44  1  0.500  0.500  0.076  1.0
  O  O45  1  0.000  0.000  0.074  1.0
[/CIF]
.