The material described by Na4SrTa5O15 crystallizes in the triclinic P-1 space group. There are five inequivalent Na sites. In the first Na site, Na(1) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(13), one O(14), one O(15), one O(7), one O(8), and one O(9) atom. In the second Na site, Na(2) is bonded in a 8-coordinate geometry to one O(12), one O(13), one O(15), one O(16), one O(8), one O(9), and two equivalent O(6) atoms. In the third Na site, Na(3) is bonded in a distorted body-centered cubic geometry to two equivalent O(10), two equivalent O(12), two equivalent O(14), and two equivalent O(7) atoms. In the fourth Na site, Na(4) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(12), one O(14), one O(15), one O(5), and two equivalent O(4) atoms. In the fifth Na site, Na(5) is bonded in a 8-coordinate geometry to two equivalent O(13), two equivalent O(15), two equivalent O(2), and two equivalent O(3) atoms. Sr(1) is bonded to one O(1), one O(12), one O(13), one O(14), one O(16), one O(2), one O(3), one O(5), one O(6), one O(7), one O(8), and one O(9) atom to form distorted SrO12 cuboctahedra that share  a cornercorner with one Sr(1)O12 cuboctahedra,  a faceface with one Ta(2)O6 octahedra,  a faceface with one Ta(3)O6 octahedra,  a faceface with one Ta(4)O6 octahedra,  a faceface with one Ta(6)O6 octahedra, faces with two equivalent Ta(1)O6 octahedra, and faces with two equivalent Ta(5)O6 octahedra. There are six inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one O(1), one O(12), one O(13), one O(2), one O(6), and one O(7) atom to form TaO6 octahedra that share  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra,  a cornercorner with one Ta(4)O6 octahedra,  a cornercorner with one Ta(6)O6 octahedra, corners with two equivalent Ta(5)O6 octahedra, and faces with two equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 2-18°. In the second Ta site, Ta(2) is bonded to two equivalent O(13), two equivalent O(3), and two equivalent O(8) atoms to form TaO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Ta(5)O6 octahedra, corners with two equivalent Ta(6)O6 octahedra, and faces with two equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 2-18°. In the third Ta site, Ta(3) is bonded to one O(10), one O(11), one O(12), one O(4), one O(5), and one O(9) atom to form TaO6 octahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra,  a cornercorner with one Ta(4)O6 octahedra,  a cornercorner with one Ta(5)O6 octahedra, corners with two equivalent Ta(6)O6 octahedra, and  a faceface with one Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-18°. In the fourth Ta site, Ta(4) is bonded to two equivalent O(14), two equivalent O(5), and two equivalent O(7) atoms to form TaO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Ta(3)O6 octahedra, corners with two equivalent Ta(6)O6 octahedra, and faces with two equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 2-18°. In the fifth Ta site, Ta(5) is bonded to one O(1), one O(15), one O(16), one O(3), one O(6), and one O(9) atom to form TaO6 octahedra that share  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra,  a cornercorner with one Ta(5)O6 octahedra,  a cornercorner with one Ta(6)O6 octahedra, corners with two equivalent Ta(1)O6 octahedra, and faces with two equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-18°. In the sixth Ta site, Ta(6) is bonded to one O(10), one O(14), one O(15), one O(2), one O(4), and one O(8) atom to form TaO6 octahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Ta(4)O6 octahedra,  a cornercorner with one Ta(5)O6 octahedra, corners with two equivalent Ta(3)O6 octahedra, and  a faceface with one Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 1-18°. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Na(4), one Sr(1), one Ta(1), and one Ta(5) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Na(5), one Sr(1), one Ta(1), and one Ta(6) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Na(5), one Sr(1), one Ta(2), and one Ta(5) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Na(4), one Ta(3), and one Ta(6) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Na(4), one Sr(1), one Ta(3), and one Ta(4) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to two equivalent Na(2), one Sr(1), one Ta(1), and one Ta(5) atom. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to one Na(1), one Na(3), one Sr(1), one Ta(1), and one Ta(4) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one Na(1), one Na(2), one Sr(1), one Ta(2), and one Ta(6) atom. In the ninth O site, O(9) is bonded in a 2-coordinate geometry to one Na(1), one Na(2), one Sr(1), one Ta(3), and one Ta(5) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Na(1), one Na(3), one Ta(3), and one Ta(6) atom. In the eleventh O site, O(11) is bonded in a distorted linear geometry to two equivalent Na(1), two equivalent Na(4), and two equivalent Ta(3) atoms. In the twelfth O site, O(12) is bonded in a distorted linear geometry to one Na(2), one Na(3), one Na(4), one Sr(1), one Ta(1), and one Ta(3) atom. In the thirteenth O site, O(13) is bonded in a distorted linear geometry to one Na(1), one Na(2), one Na(5), one Sr(1), one Ta(1), and one Ta(2) atom. In the fourteenth O site, O(14) is bonded in a distorted linear geometry to one Na(1), one Na(3), one Na(4), one Sr(1), one Ta(4), and one Ta(6) atom. In the fifteenth O site, O(15) is bonded in a distorted linear geometry to one Na(1), one Na(2), one Na(4), one Na(5), one Ta(5), and one Ta(6) atom. In the sixteenth O site, O(16) is bonded in a distorted octahedral geometry to two equivalent Na(2), two equivalent Sr(1), and two equivalent Ta(5) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na4SrTa5O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.897
_cell_length_b   8.884
_cell_length_c   11.285
_cell_angle_alpha   108.704
_cell_angle_beta   90.478
_cell_angle_gamma   104.532
_symmetry_Int_Tables_number   1
_cell_volume   631.006
_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  0.400  0.701  0.800  1.0
  Na  Na1  1  0.801  0.900  0.601  1.0
  Na  Na2  1  0.199  0.100  0.399  1.0
  Na  Na3  1  0.600  0.299  0.200  1.0
  Na  Na4  1  0.000  0.500  0.000  1.0
  Na  Na5  1  0.800  0.900  0.100  1.0
  Na  Na6  1  0.200  0.100  0.900  1.0
  Na  Na7  1  0.000  0.500  0.500  1.0
  Sr  Sr8  1  0.600  0.300  0.700  1.0
  Sr  Sr9  1  0.400  0.700  0.300  1.0
  Ta  Ta10  1  0.901  0.700  0.300  1.0
  Ta  Ta11  1  0.099  0.300  0.700  1.0
  Ta  Ta12  1  0.500  0.500  0.500  1.0
  Ta  Ta13  1  0.299  0.902  0.098  1.0
  Ta  Ta14  1  0.701  0.098  0.902  1.0
  Ta  Ta15  1  0.500  0.500  0.000  1.0
  Ta  Ta16  1  0.702  0.101  0.398  1.0
  Ta  Ta17  1  0.098  0.297  0.199  1.0
  Ta  Ta18  1  0.902  0.703  0.801  1.0
  Ta  Ta19  1  0.298  0.899  0.602  1.0
  O  O20  1  0.770  0.885  0.327  1.0
  O  O21  1  0.969  0.485  0.727  1.0
  O  O22  1  0.370  0.685  0.527  1.0
  O  O23  1  0.170  0.085  0.128  1.0
  O  O24  1  0.570  0.285  0.927  1.0
  O  O25  1  0.031  0.515  0.273  1.0
  O  O26  1  0.230  0.115  0.673  1.0
  O  O27  1  0.630  0.315  0.473  1.0
  O  O28  1  0.430  0.715  0.073  1.0
  O  O29  1  0.830  0.915  0.872  1.0
  O  O30  1  0.088  0.829  0.456  1.0
  O  O31  1  0.288  0.428  0.856  1.0
  O  O32  1  0.685  0.627  0.658  1.0
  O  O33  1  0.484  0.027  0.258  1.0
  O  O34  1  0.885  0.230  0.058  1.0
  O  O35  1  0.115  0.770  0.942  1.0
  O  O36  1  0.315  0.373  0.342  1.0
  O  O37  1  0.712  0.572  0.144  1.0
  O  O38  1  0.516  0.973  0.742  1.0
  O  O39  1  0.912  0.171  0.544  1.0
  O  O40  1  0.500  0.000  0.000  1.0
  O  O41  1  0.897  0.201  0.799  1.0
  O  O42  1  0.303  0.399  0.601  1.0
  O  O43  1  0.697  0.601  0.399  1.0
  O  O44  1  0.103  0.799  0.201  1.0
  O  O45  1  0.699  0.597  0.898  1.0
  O  O46  1  0.100  0.800  0.700  1.0
  O  O47  1  0.500  0.000  0.500  1.0
  O  O48  1  0.900  0.200  0.300  1.0
  O  O49  1  0.301  0.403  0.102  1.0
[/CIF]
.
The material described by Na4SrTa5O15 crystallizes in the triclinic P-1 space group. There are five inequivalent Na sites. In the first Na site, Na(1) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(13), one O(14), one O(15), one O(7), one O(8), and one O(9) atom. In the second Na site, Na(2) is bonded in a 8-coordinate geometry to one O(12), one O(13), one O(15), one O(16), one O(8), one O(9), and two equivalent O(6) atoms. In the third Na site, Na(3) is bonded in a distorted body-centered cubic geometry to two equivalent O(10), two equivalent O(12), two equivalent O(14), and two equivalent O(7) atoms. In the fourth Na site, Na(4) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(12), one O(14), one O(15), one O(5), and two equivalent O(4) atoms. In the fifth Na site, Na(5) is bonded in a 8-coordinate geometry to two equivalent O(13), two equivalent O(15), two equivalent O(2), and two equivalent O(3) atoms. Sr(1) is bonded to one O(1), one O(12), one O(13), one O(14), one O(16), one O(2), one O(3), one O(5), one O(6), one O(7), one O(8), and one O(9) atom to form distorted SrO12 cuboctahedra that share  a cornercorner with one Sr(1)O12 cuboctahedra,  a faceface with one Ta(2)O6 octahedra,  a faceface with one Ta(3)O6 octahedra,  a faceface with one Ta(4)O6 octahedra,  a faceface with one Ta(6)O6 octahedra, faces with two equivalent Ta(1)O6 octahedra, and faces with two equivalent Ta(5)O6 octahedra. There are six inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one O(1), one O(12), one O(13), one O(2), one O(6), and one O(7) atom to form TaO6 octahedra that share  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra,  a cornercorner with one Ta(4)O6 octahedra,  a cornercorner with one Ta(6)O6 octahedra, corners with two equivalent Ta(5)O6 octahedra, and faces with two equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 2-18°. In the second Ta site, Ta(2) is bonded to two equivalent O(13), two equivalent O(3), and two equivalent O(8) atoms to form TaO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Ta(5)O6 octahedra, corners with two equivalent Ta(6)O6 octahedra, and faces with two equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 2-18°. In the third Ta site, Ta(3) is bonded to one O(10), one O(11), one O(12), one O(4), one O(5), and one O(9) atom to form TaO6 octahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra,  a cornercorner with one Ta(4)O6 octahedra,  a cornercorner with one Ta(5)O6 octahedra, corners with two equivalent Ta(6)O6 octahedra, and  a faceface with one Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-18°. In the fourth Ta site, Ta(4) is bonded to two equivalent O(14), two equivalent O(5), and two equivalent O(7) atoms to form TaO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Ta(3)O6 octahedra, corners with two equivalent Ta(6)O6 octahedra, and faces with two equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 2-18°. In the fifth Ta site, Ta(5) is bonded to one O(1), one O(15), one O(16), one O(3), one O(6), and one O(9) atom to form TaO6 octahedra that share  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra,  a cornercorner with one Ta(5)O6 octahedra,  a cornercorner with one Ta(6)O6 octahedra, corners with two equivalent Ta(1)O6 octahedra, and faces with two equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-18°. In the sixth Ta site, Ta(6) is bonded to one O(10), one O(14), one O(15), one O(2), one O(4), and one O(8) atom to form TaO6 octahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Ta(4)O6 octahedra,  a cornercorner with one Ta(5)O6 octahedra, corners with two equivalent Ta(3)O6 octahedra, and  a faceface with one Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 1-18°. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Na(4), one Sr(1), one Ta(1), and one Ta(5) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Na(5), one Sr(1), one Ta(1), and one Ta(6) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Na(5), one Sr(1), one Ta(2), and one Ta(5) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Na(4), one Ta(3), and one Ta(6) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Na(4), one Sr(1), one Ta(3), and one Ta(4) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to two equivalent Na(2), one Sr(1), one Ta(1), and one Ta(5) atom. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to one Na(1), one Na(3), one Sr(1), one Ta(1), and one Ta(4) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one Na(1), one Na(2), one Sr(1), one Ta(2), and one Ta(6) atom. In the ninth O site, O(9) is bonded in a 2-coordinate geometry to one Na(1), one Na(2), one Sr(1), one Ta(3), and one Ta(5) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Na(1), one Na(3), one Ta(3), and one Ta(6) atom. In the eleventh O site, O(11) is bonded in a distorted linear geometry to two equivalent Na(1), two equivalent Na(4), and two equivalent Ta(3) atoms. In the twelfth O site, O(12) is bonded in a distorted linear geometry to one Na(2), one Na(3), one Na(4), one Sr(1), one Ta(1), and one Ta(3) atom. In the thirteenth O site, O(13) is bonded in a distorted linear geometry to one Na(1), one Na(2), one Na(5), one Sr(1), one Ta(1), and one Ta(2) atom. In the fourteenth O site, O(14) is bonded in a distorted linear geometry to one Na(1), one Na(3), one Na(4), one Sr(1), one Ta(4), and one Ta(6) atom. In the fifteenth O site, O(15) is bonded in a distorted linear geometry to one Na(1), one Na(2), one Na(4), one Na(5), one Ta(5), and one Ta(6) atom. In the sixteenth O site, O(16) is bonded in a distorted octahedral geometry to two equivalent Na(2), two equivalent Sr(1), and two equivalent Ta(5) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na4SrTa5O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.897
_cell_length_b   8.884
_cell_length_c   11.285
_cell_angle_alpha   108.704
_cell_angle_beta   90.478
_cell_angle_gamma   104.532
_symmetry_Int_Tables_number   1
_cell_volume   631.006
_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  0.400  0.701  0.800  1.0
  Na  Na1  1  0.801  0.900  0.601  1.0
  Na  Na2  1  0.199  0.100  0.399  1.0
  Na  Na3  1  0.600  0.299  0.200  1.0
  Na  Na4  1  0.000  0.500  0.000  1.0
  Na  Na5  1  0.800  0.900  0.100  1.0
  Na  Na6  1  0.200  0.100  0.900  1.0
  Na  Na7  1  0.000  0.500  0.500  1.0
  Sr  Sr8  1  0.600  0.300  0.700  1.0
  Sr  Sr9  1  0.400  0.700  0.300  1.0
  Ta  Ta10  1  0.901  0.700  0.300  1.0
  Ta  Ta11  1  0.099  0.300  0.700  1.0
  Ta  Ta12  1  0.500  0.500  0.500  1.0
  Ta  Ta13  1  0.299  0.902  0.098  1.0
  Ta  Ta14  1  0.701  0.098  0.902  1.0
  Ta  Ta15  1  0.500  0.500  0.000  1.0
  Ta  Ta16  1  0.702  0.101  0.398  1.0
  Ta  Ta17  1  0.098  0.297  0.199  1.0
  Ta  Ta18  1  0.902  0.703  0.801  1.0
  Ta  Ta19  1  0.298  0.899  0.602  1.0
  O  O20  1  0.770  0.885  0.327  1.0
  O  O21  1  0.969  0.485  0.727  1.0
  O  O22  1  0.370  0.685  0.527  1.0
  O  O23  1  0.170  0.085  0.128  1.0
  O  O24  1  0.570  0.285  0.927  1.0
  O  O25  1  0.031  0.515  0.273  1.0
  O  O26  1  0.230  0.115  0.673  1.0
  O  O27  1  0.630  0.315  0.473  1.0
  O  O28  1  0.430  0.715  0.073  1.0
  O  O29  1  0.830  0.915  0.872  1.0
  O  O30  1  0.088  0.829  0.456  1.0
  O  O31  1  0.288  0.428  0.856  1.0
  O  O32  1  0.685  0.627  0.658  1.0
  O  O33  1  0.484  0.027  0.258  1.0
  O  O34  1  0.885  0.230  0.058  1.0
  O  O35  1  0.115  0.770  0.942  1.0
  O  O36  1  0.315  0.373  0.342  1.0
  O  O37  1  0.712  0.572  0.144  1.0
  O  O38  1  0.516  0.973  0.742  1.0
  O  O39  1  0.912  0.171  0.544  1.0
  O  O40  1  0.500  0.000  0.000  1.0
  O  O41  1  0.897  0.201  0.799  1.0
  O  O42  1  0.303  0.399  0.601  1.0
  O  O43  1  0.697  0.601  0.399  1.0
  O  O44  1  0.103  0.799  0.201  1.0
  O  O45  1  0.699  0.597  0.898  1.0
  O  O46  1  0.100  0.800  0.700  1.0
  O  O47  1  0.500  0.000  0.500  1.0
  O  O48  1  0.900  0.200  0.300  1.0
  O  O49  1  0.301  0.403  0.102  1.0
[/CIF]
.