The material described by Ba2Sr3Nb10O30 crystallizes in the monoclinic P2 space group. Ba(1) is bonded in a 12-coordinate geometry to one O(1), one O(10), one O(13), one O(16), two equivalent O(11), two equivalent O(4), two equivalent O(6), and two equivalent O(7) atoms. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 10-coordinate geometry to one O(14), one O(15), one O(2), one O(9), two equivalent O(12), two equivalent O(5), and two equivalent O(8) atoms. In the second Sr site, Sr(2) is bonded to two equivalent O(13), two equivalent O(15), four equivalent O(1), and four equivalent O(3) 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(3)O6 octahedra. There are six inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(1), one O(11), one O(3), one O(5), and two equivalent O(13) atoms to form NbO6 octahedra that share  a cornercorner with one Nb(4)O6 octahedra,  a cornercorner with one Nb(5)O6 octahedra, corners with two equivalent Nb(1)O6 octahedra, corners with two equivalent Nb(3)O6 octahedra, and faces with two equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 8-39°. In the second Nb site, Nb(2) is bonded to one O(12), one O(2), one O(4), one O(6), and two equivalent O(14) atoms to form corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 13-45°. In the third Nb site, Nb(3) is bonded to one O(1), one O(12), one O(3), one O(7), and two equivalent O(15) atoms to form NbO6 octahedra that share  a cornercorner with one Nb(2)O6 octahedra,  a cornercorner with one Nb(6)O6 octahedra, corners with two equivalent Nb(1)O6 octahedra, corners with two equivalent Nb(3)O6 octahedra, and faces with two equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 8-45°. In the fourth Nb site, Nb(4) is bonded to one O(11), one O(2), one O(4), one O(8), and two equivalent O(16) atoms to form corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 10-39°. In the fifth Nb site, Nb(5) is bonded to two equivalent O(5), two equivalent O(8), and two equivalent O(9) atoms to form corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 0-39°. In the sixth Nb site, Nb(6) is bonded to two equivalent O(10), two equivalent O(6), and two equivalent O(7) atoms to form corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 0-37°. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Ba(1), two equivalent Sr(2), one Nb(1), and one Nb(3) atom. In the second O site, O(2) is bonded in a linear geometry to one Sr(1), one Nb(2), and one Nb(4) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to two equivalent Sr(2), one Nb(1), and one Nb(3) atom. In the fourth O site, O(4) is bonded in a distorted linear geometry to two equivalent Ba(1), one Nb(2), and one Nb(4) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to two equivalent Sr(1), one Nb(1), and one Nb(5) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to two equivalent Ba(1), one Nb(2), and one Nb(6) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to two equivalent Ba(1), one Nb(3), and one Nb(6) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Nb(4), and one Nb(5) atom. In the ninth O site, O(9) is bonded in a distorted linear geometry to two equivalent Sr(1) and two equivalent Nb(5) atoms. In the tenth O site, O(10) is bonded in a distorted linear geometry to two equivalent Ba(1) and two equivalent Nb(6) atoms. In the eleventh O site, O(11) is bonded to two equivalent Ba(1), one Nb(1), and one Nb(4) atom to form distorted corner-sharing OBa2Nb2 trigonal pyramids. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Nb(2), and one Nb(3) atom. In the thirteenth O site, O(13) is bonded in a 2-coordinate geometry to one Ba(1), one Sr(2), and two equivalent Nb(1) atoms. In the fourteenth O site, O(14) is bonded in a 2-coordinate geometry to one Sr(1) and two equivalent Nb(2) atoms. In the fifteenth O site, O(15) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(2), and two equivalent Nb(3) atoms. In the sixteenth O site, O(16) is bonded in a 2-coordinate geometry to one Ba(1) and two equivalent Nb(4) atoms. is represented by the CIF file [CIF]
data_Ba2Sr3Nb10O30
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.064
_cell_length_b   12.661
_cell_length_c   12.664
_cell_angle_alpha   89.656
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   651.588
_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
  Ba  Ba0  1  0.513  0.831  0.323  1.0
  Ba  Ba1  1  0.513  0.169  0.677  1.0
  Sr  Sr2  1  0.494  0.321  0.168  1.0
  Sr  Sr3  1  0.494  0.679  0.832  1.0
  Sr  Sr4  1  0.512  0.500  0.500  1.0
  Nb  Nb5  1  0.005  0.420  0.711  1.0
  Nb  Nb6  1  0.005  0.580  0.289  1.0
  Nb  Nb7  1  0.996  0.927  0.796  1.0
  Nb  Nb8  1  0.996  0.073  0.204  1.0
  Nb  Nb9  1  0.004  0.711  0.583  1.0
  Nb  Nb10  1  0.004  0.289  0.417  1.0
  Nb  Nb11  1  0.997  0.794  0.072  1.0
  Nb  Nb12  1  0.997  0.206  0.928  1.0
  Nb  Nb13  1  0.996  0.500  0.000  1.0
  Nb  Nb14  1  0.996  0.000  0.500  1.0
  O  O15  1  0.044  0.362  0.565  1.0
  O  O16  1  0.044  0.638  0.435  1.0
  O  O17  1  0.050  0.855  0.932  1.0
  O  O18  1  0.050  0.145  0.068  1.0
  O  O19  1  0.047  0.563  0.635  1.0
  O  O20  1  0.047  0.437  0.365  1.0
  O  O21  1  0.042  0.931  0.148  1.0
  O  O22  1  0.042  0.069  0.852  1.0
  O  O23  1  0.046  0.509  0.841  1.0
  O  O24  1  0.046  0.491  0.159  1.0
  O  O25  1  0.044  0.002  0.656  1.0
  O  O26  1  0.044  0.998  0.344  1.0
  O  O27  1  0.041  0.841  0.495  1.0
  O  O28  1  0.041  0.159  0.505  1.0
  O  O29  1  0.048  0.657  0.994  1.0
  O  O30  1  0.048  0.343  0.006  1.0
  O  O31  1  0.539  0.500  0.000  1.0
  O  O32  1  0.536  0.000  0.500  1.0
  O  O33  1  0.041  0.280  0.778  1.0
  O  O34  1  0.041  0.720  0.222  1.0
  O  O35  1  0.039  0.769  0.728  1.0
  O  O36  1  0.039  0.231  0.272  1.0
  O  O37  1  0.540  0.419  0.700  1.0
  O  O38  1  0.540  0.581  0.300  1.0
  O  O39  1  0.541  0.910  0.790  1.0
  O  O40  1  0.541  0.090  0.210  1.0
  O  O41  1  0.539  0.701  0.584  1.0
  O  O42  1  0.539  0.299  0.416  1.0
  O  O43  1  0.541  0.791  0.086  1.0
  O  O44  1  0.541  0.209  0.914  1.0
[/CIF]
.
The material described by Ba2Sr3Nb10O30 crystallizes in the monoclinic P2 space group. Ba(1) is bonded in a 12-coordinate geometry to one O(1), one O(10), one O(13), one O(16), two equivalent O(11), two equivalent O(4), two equivalent O(6), and two equivalent O(7) atoms. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 10-coordinate geometry to one O(14), one O(15), one O(2), one O(9), two equivalent O(12), two equivalent O(5), and two equivalent O(8) atoms. In the second Sr site, Sr(2) is bonded to two equivalent O(13), two equivalent O(15), four equivalent O(1), and four equivalent O(3) 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(3)O6 octahedra. There are six inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(1), one O(11), one O(3), one O(5), and two equivalent O(13) atoms to form NbO6 octahedra that share  a cornercorner with one Nb(4)O6 octahedra,  a cornercorner with one Nb(5)O6 octahedra, corners with two equivalent Nb(1)O6 octahedra, corners with two equivalent Nb(3)O6 octahedra, and faces with two equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 8-39°. In the second Nb site, Nb(2) is bonded to one O(12), one O(2), one O(4), one O(6), and two equivalent O(14) atoms to form corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 13-45°. In the third Nb site, Nb(3) is bonded to one O(1), one O(12), one O(3), one O(7), and two equivalent O(15) atoms to form NbO6 octahedra that share  a cornercorner with one Nb(2)O6 octahedra,  a cornercorner with one Nb(6)O6 octahedra, corners with two equivalent Nb(1)O6 octahedra, corners with two equivalent Nb(3)O6 octahedra, and faces with two equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 8-45°. In the fourth Nb site, Nb(4) is bonded to one O(11), one O(2), one O(4), one O(8), and two equivalent O(16) atoms to form corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 10-39°. In the fifth Nb site, Nb(5) is bonded to two equivalent O(5), two equivalent O(8), and two equivalent O(9) atoms to form corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 0-39°. In the sixth Nb site, Nb(6) is bonded to two equivalent O(10), two equivalent O(6), and two equivalent O(7) atoms to form corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 0-37°. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Ba(1), two equivalent Sr(2), one Nb(1), and one Nb(3) atom. In the second O site, O(2) is bonded in a linear geometry to one Sr(1), one Nb(2), and one Nb(4) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to two equivalent Sr(2), one Nb(1), and one Nb(3) atom. In the fourth O site, O(4) is bonded in a distorted linear geometry to two equivalent Ba(1), one Nb(2), and one Nb(4) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to two equivalent Sr(1), one Nb(1), and one Nb(5) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to two equivalent Ba(1), one Nb(2), and one Nb(6) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to two equivalent Ba(1), one Nb(3), and one Nb(6) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Nb(4), and one Nb(5) atom. In the ninth O site, O(9) is bonded in a distorted linear geometry to two equivalent Sr(1) and two equivalent Nb(5) atoms. In the tenth O site, O(10) is bonded in a distorted linear geometry to two equivalent Ba(1) and two equivalent Nb(6) atoms. In the eleventh O site, O(11) is bonded to two equivalent Ba(1), one Nb(1), and one Nb(4) atom to form distorted corner-sharing OBa2Nb2 trigonal pyramids. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Nb(2), and one Nb(3) atom. In the thirteenth O site, O(13) is bonded in a 2-coordinate geometry to one Ba(1), one Sr(2), and two equivalent Nb(1) atoms. In the fourteenth O site, O(14) is bonded in a 2-coordinate geometry to one Sr(1) and two equivalent Nb(2) atoms. In the fifteenth O site, O(15) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(2), and two equivalent Nb(3) atoms. In the sixteenth O site, O(16) is bonded in a 2-coordinate geometry to one Ba(1) and two equivalent Nb(4) atoms. is represented by the CIF file [CIF]
data_Ba2Sr3Nb10O30
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.064
_cell_length_b   12.661
_cell_length_c   12.664
_cell_angle_alpha   89.656
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   651.588
_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
  Ba  Ba0  1  0.513  0.831  0.323  1.0
  Ba  Ba1  1  0.513  0.169  0.677  1.0
  Sr  Sr2  1  0.494  0.321  0.168  1.0
  Sr  Sr3  1  0.494  0.679  0.832  1.0
  Sr  Sr4  1  0.512  0.500  0.500  1.0
  Nb  Nb5  1  0.005  0.420  0.711  1.0
  Nb  Nb6  1  0.005  0.580  0.289  1.0
  Nb  Nb7  1  0.996  0.927  0.796  1.0
  Nb  Nb8  1  0.996  0.073  0.204  1.0
  Nb  Nb9  1  0.004  0.711  0.583  1.0
  Nb  Nb10  1  0.004  0.289  0.417  1.0
  Nb  Nb11  1  0.997  0.794  0.072  1.0
  Nb  Nb12  1  0.997  0.206  0.928  1.0
  Nb  Nb13  1  0.996  0.500  0.000  1.0
  Nb  Nb14  1  0.996  0.000  0.500  1.0
  O  O15  1  0.044  0.362  0.565  1.0
  O  O16  1  0.044  0.638  0.435  1.0
  O  O17  1  0.050  0.855  0.932  1.0
  O  O18  1  0.050  0.145  0.068  1.0
  O  O19  1  0.047  0.563  0.635  1.0
  O  O20  1  0.047  0.437  0.365  1.0
  O  O21  1  0.042  0.931  0.148  1.0
  O  O22  1  0.042  0.069  0.852  1.0
  O  O23  1  0.046  0.509  0.841  1.0
  O  O24  1  0.046  0.491  0.159  1.0
  O  O25  1  0.044  0.002  0.656  1.0
  O  O26  1  0.044  0.998  0.344  1.0
  O  O27  1  0.041  0.841  0.495  1.0
  O  O28  1  0.041  0.159  0.505  1.0
  O  O29  1  0.048  0.657  0.994  1.0
  O  O30  1  0.048  0.343  0.006  1.0
  O  O31  1  0.539  0.500  0.000  1.0
  O  O32  1  0.536  0.000  0.500  1.0
  O  O33  1  0.041  0.280  0.778  1.0
  O  O34  1  0.041  0.720  0.222  1.0
  O  O35  1  0.039  0.769  0.728  1.0
  O  O36  1  0.039  0.231  0.272  1.0
  O  O37  1  0.540  0.419  0.700  1.0
  O  O38  1  0.540  0.581  0.300  1.0
  O  O39  1  0.541  0.910  0.790  1.0
  O  O40  1  0.541  0.090  0.210  1.0
  O  O41  1  0.539  0.701  0.584  1.0
  O  O42  1  0.539  0.299  0.416  1.0
  O  O43  1  0.541  0.791  0.086  1.0
  O  O44  1  0.541  0.209  0.914  1.0
[/CIF]
.