The material described by Sr14Nb6O29 crystallizes in the triclinic P1 space group. There are fourteen inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(26), one O(3), one O(4), one O(6), and one O(8) atom. In the second Sr site, Sr(2) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(3), one O(5), one O(7), and one O(8) atom. In the third Sr site, Sr(3) is bonded to one O(2), one O(26), one O(3), one O(4), one O(6), and one O(8) atom to form distorted SrO6 square pyramids that share  a cornercorner with one Sr(13)O6 octahedra, corners with three equivalent Nb(3)O6 octahedra,  a cornercorner with one Nb(1)O5 trigonal bipyramid, and  an edgeedge with one Nb(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 18-39°. In the fourth Sr site, Sr(4) is bonded in a 6-coordinate geometry to one O(11), one O(2), one O(3), one O(6), one O(7), and one O(8) atom. In the fifth Sr site, Sr(5) is bonded in a 6-coordinate geometry to one O(13), one O(14), one O(15), one O(16), one O(18), and one O(9) atom. In the sixth Sr site, Sr(6) is bonded to one O(10), one O(11), one O(12), one O(5), one O(7), and one O(9) atom to form SrO6 octahedra that share corners with three equivalent Nb(3)O6 octahedra and corners with three equivalent Nb(5)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 16-39°. In the seventh Sr site, Sr(7) is bonded in a 6-coordinate geometry to one O(10), one O(12), one O(16), one O(5), one O(7), and one O(9) atom. In the eighth Sr site, Sr(8) is bonded in a 6-coordinate geometry to one O(19), one O(20), one O(21), one O(22), one O(23), and one O(24) atom. In the ninth Sr site, Sr(9) is bonded in a 7-coordinate geometry to one O(20), one O(21), one O(23), one O(25), one O(27), one O(28), and one O(29) atom. In the tenth Sr site, Sr(10) is bonded to one O(19), one O(20), one O(21), one O(22), one O(23), and one O(24) atom to form SrO6 octahedra that share corners with three equivalent Nb(6)O6 octahedra and corners with three equivalent Nb(4)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 21-29°. In the eleventh Sr site, Sr(11) is bonded in a 6-coordinate geometry to one O(13), one O(14), one O(15), one O(17), one O(18), and one O(22) atom. In the twelfth Sr site, Sr(12) is bonded in a 7-coordinate geometry to one O(20), one O(21), one O(23), one O(24), one O(25), one O(28), and one O(29) atom. In the thirteenth Sr site, Sr(13) is bonded to one O(1), one O(25), one O(26), one O(27), one O(28), and one O(29) atom to form SrO6 octahedra that share corners with three equivalent Nb(6)O6 octahedra,  a cornercorner with one Sr(3)O6 square pyramid, and corners with three equivalent Nb(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 22-28°. In the fourteenth Sr site, Sr(14) is bonded in a 7-coordinate geometry to one O(1), one O(25), one O(26), one O(27), one O(28), one O(29), and one O(4) atom. There are six inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(1), one O(26), one O(27), one O(4), and one O(6) atom to form distorted NbO5 trigonal bipyramids that share corners with three equivalent Sr(13)O6 octahedra,  a cornercorner with one Sr(3)O6 square pyramid, and  an edgeedge with one Sr(3)O6 square pyramid. The corner-sharing octahedral tilt angles range from 44-59°. In the second Nb site, Nb(2) is bonded in a 6-coordinate geometry to one O(13), one O(14), one O(15), one O(16), one O(17), and one O(18) atom. In the third Nb site, Nb(3) is bonded to one O(11), one O(2), one O(3), one O(5), one O(7), and one O(8) atom to form NbO6 octahedra that share corners with three equivalent Sr(6)O6 octahedra and corners with three equivalent Sr(3)O6 square pyramids. The corner-sharing octahedral tilt angles range from 16-39°. In the fourth Nb site, Nb(4) is bonded to one O(15), one O(17), one O(19), one O(22), and one O(24) atom to form distorted NbO5 trigonal bipyramids that share corners with three equivalent Sr(10)O6 octahedra. The corner-sharing octahedral tilt angles range from 52-56°. In the fifth Nb site, Nb(5) is bonded to one O(10), one O(12), one O(16), one O(18), and one O(9) atom to form distorted NbO5 trigonal bipyramids that share corners with three equivalent Sr(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-54°. In the sixth Nb site, Nb(6) is bonded to one O(20), one O(21), one O(23), one O(25), one O(28), and one O(29) atom to form NbO6 octahedra that share corners with three equivalent Sr(10)O6 octahedra and corners with three equivalent Sr(13)O6 octahedra. The corner-sharing octahedral tilt angles range from 21-29°. There are twenty-nine inequivalent O sites. In the first O site, O(1) is bonded to one Sr(1), one Sr(13), one Sr(14), and one Nb(1) atom to form distorted OSr3Nb tetrahedra that share  a cornercorner with one O(3)Sr4Nb square pyramid, corners with three equivalent O(27)Sr3Nb tetrahedra,  a cornercorner with one O(4)Sr3Nb trigonal pyramid,  an edgeedge with one O(25)Sr4Nb square pyramid, and  an edgeedge with one O(4)Sr3Nb trigonal pyramid. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(3), one Sr(4), and one Nb(3) atom. In the third O site, O(3) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), and one Nb(3) atom to form distorted OSr4Nb square pyramids that share  a cornercorner with one O(7)Sr4Nb square pyramid,  a cornercorner with one O(1)Sr3Nb tetrahedra,  a cornercorner with one O(11)Sr3Nb tetrahedra,  a cornercorner with one O(10)Sr3Nb trigonal pyramid,  an edgeedge with one O(7)Sr4Nb square pyramid,  an edgeedge with one O(11)Sr3Nb tetrahedra, and  an edgeedge with one O(4)Sr3Nb trigonal pyramid. In the fourth O site, O(4) is bonded to one Sr(1), one Sr(14), one Sr(3), and one Nb(1) atom to form distorted OSr3Nb trigonal pyramids that share  a cornercorner with one O(25)Sr4Nb square pyramid,  a cornercorner with one O(1)Sr3Nb tetrahedra,  an edgeedge with one O(3)Sr4Nb square pyramid,  an edgeedge with one O(1)Sr3Nb tetrahedra, and  an edgeedge with one O(27)Sr3Nb tetrahedra. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(6), one Sr(7), and one Nb(3) atom. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to one Sr(1), one Sr(3), one Sr(4), and one Nb(1) atom. In the seventh O site, O(7) is bonded to one Sr(2), one Sr(4), one Sr(6), one Sr(7), and one Nb(3) atom to form distorted OSr4Nb square pyramids that share  a cornercorner with one O(3)Sr4Nb square pyramid,  a cornercorner with one O(16)Sr2Nb2 tetrahedra, corners with two equivalent O(11)Sr3Nb tetrahedra, corners with two equivalent O(9)Sr3Nb tetrahedra,  a cornercorner with one O(10)Sr3Nb trigonal pyramid,  an edgeedge with one O(3)Sr4Nb square pyramid,  an edgeedge with one O(11)Sr3Nb tetrahedra, and  an edgeedge with one O(10)Sr3Nb trigonal pyramid. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Sr(4), and one Nb(3) atom. In the ninth O site, O(9) is bonded to one Sr(5), one Sr(6), one Sr(7), and one Nb(5) atom to form distorted OSr3Nb tetrahedra that share corners with two equivalent O(7)Sr4Nb square pyramids,  a cornercorner with one O(15)Sr2Nb2 tetrahedra,  a cornercorner with one O(11)Sr3Nb tetrahedra, corners with three equivalent O(16)Sr2Nb2 tetrahedra, corners with three equivalent O(10)Sr3Nb trigonal pyramids, and  an edgeedge with one O(18)Sr2Nb2 trigonal pyramid. In the tenth O site, O(10) is bonded to one Sr(2), one Sr(6), one Sr(7), and one Nb(5) atom to form distorted OSr3Nb trigonal pyramids that share  a cornercorner with one O(3)Sr4Nb square pyramid,  a cornercorner with one O(7)Sr4Nb square pyramid, corners with three equivalent O(9)Sr3Nb tetrahedra,  a cornercorner with one O(18)Sr2Nb2 trigonal pyramid,  an edgeedge with one O(7)Sr4Nb square pyramid,  an edgeedge with one O(16)Sr2Nb2 tetrahedra, and  an edgeedge with one O(11)Sr3Nb tetrahedra. In the eleventh O site, O(11) is bonded to one Sr(2), one Sr(4), one Sr(6), and one Nb(3) atom to form distorted OSr3Nb tetrahedra that share  a cornercorner with one O(3)Sr4Nb square pyramid, corners with two equivalent O(7)Sr4Nb square pyramids,  a cornercorner with one O(9)Sr3Nb tetrahedra,  an edgeedge with one O(3)Sr4Nb square pyramid,  an edgeedge with one O(7)Sr4Nb square pyramid, and  an edgeedge with one O(10)Sr3Nb trigonal pyramid. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Sr(6), one Sr(7), and one Nb(5) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal non-coplanar geometry to one Sr(11), one Sr(5), and one Nb(2) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to one Sr(11), one Sr(5), and one Nb(2) atom. In the fifteenth O site, O(15) is bonded to one Sr(11), one Sr(5), one Nb(2), and one Nb(4) atom to form OSr2Nb2 tetrahedra that share  a cornercorner with one O(9)Sr3Nb tetrahedra, corners with two equivalent O(16)Sr2Nb2 tetrahedra,  a cornercorner with one O(18)Sr2Nb2 trigonal pyramid,  an edgeedge with one O(22)Sr3Nb tetrahedra, and  an edgeedge with one O(18)Sr2Nb2 trigonal pyramid. In the sixteenth O site, O(16) is bonded to one Sr(5), one Sr(7), one Nb(2), and one Nb(5) atom to form distorted OSr2Nb2 tetrahedra that share  a cornercorner with one O(7)Sr4Nb square pyramid, corners with two equivalent O(15)Sr2Nb2 tetrahedra, corners with three equivalent O(9)Sr3Nb tetrahedra,  a cornercorner with one O(18)Sr2Nb2 trigonal pyramid,  an edgeedge with one O(18)Sr2Nb2 trigonal pyramid, and  an edgeedge with one O(10)Sr3Nb trigonal pyramid. In the seventeenth O site, O(17) is bonded in a trigonal non-coplanar geometry to one Sr(11), one Nb(2), and one Nb(4) atom. In the eighteenth O site, O(18) is bonded to one Sr(11), one Sr(5), one Nb(2), and one Nb(5) atom to form distorted OSr2Nb2 trigonal pyramids that share  a cornercorner with one O(15)Sr2Nb2 tetrahedra,  a cornercorner with one O(16)Sr2Nb2 tetrahedra,  a cornercorner with one O(22)Sr3Nb tetrahedra,  a cornercorner with one O(10)Sr3Nb trigonal pyramid,  an edgeedge with one O(15)Sr2Nb2 tetrahedra,  an edgeedge with one O(16)Sr2Nb2 tetrahedra, and  an edgeedge with one O(9)Sr3Nb tetrahedra. In the nineteenth O site, O(19) is bonded in a 3-coordinate geometry to one Sr(10), one Sr(8), and one Nb(4) atom. In the twentieth O site, O(20) is bonded to one Sr(10), one Sr(12), one Sr(8), one Sr(9), and one Nb(6) atom to form distorted OSr4Nb square pyramids that share  a cornercorner with one O(25)Sr4Nb square pyramid,  a cornercorner with one O(27)Sr3Nb tetrahedra, corners with two equivalent O(22)Sr3Nb tetrahedra,  a cornercorner with one O(23)Sr4Nb trigonal bipyramid,  an edgeedge with one O(25)Sr4Nb square pyramid, and edges with two equivalent O(23)Sr4Nb trigonal bipyramids. In the twenty-first O site, O(21) is bonded in a 5-coordinate geometry to one Sr(10), one Sr(12), one Sr(8), one Sr(9), and one Nb(6) atom. In the twenty-second O site, O(22) is bonded to one Sr(10), one Sr(11), one Sr(8), and one Nb(4) atom to form OSr3Nb tetrahedra that share corners with two equivalent O(20)Sr4Nb square pyramids, corners with two equivalent O(23)Sr4Nb trigonal bipyramids,  a cornercorner with one O(18)Sr2Nb2 trigonal pyramid, and  an edgeedge with one O(15)Sr2Nb2 tetrahedra. In the twenty-third O site, O(23) is bonded to one Sr(10), one Sr(12), one Sr(8), one Sr(9), and one Nb(6) atom to form distorted OSr4Nb trigonal bipyramids that share  a cornercorner with one O(20)Sr4Nb square pyramid,  a cornercorner with one O(25)Sr4Nb square pyramid,  a cornercorner with one O(27)Sr3Nb tetrahedra, corners with two equivalent O(22)Sr3Nb tetrahedra,  an edgeedge with one O(25)Sr4Nb square pyramid, and edges with two equivalent O(20)Sr4Nb square pyramids. In the twenty-fourth O site, O(24) is bonded in a 4-coordinate geometry to one Sr(10), one Sr(12), one Sr(8), and one Nb(4) atom. In the twenty-fifth O site, O(25) is bonded to one Sr(12), one Sr(13), one Sr(14), one Sr(9), and one Nb(6) atom to form distorted OSr4Nb square pyramids that share  a cornercorner with one O(20)Sr4Nb square pyramid,  a cornercorner with one O(27)Sr3Nb tetrahedra,  a cornercorner with one O(23)Sr4Nb trigonal bipyramid,  a cornercorner with one O(4)Sr3Nb trigonal pyramid,  an edgeedge with one O(20)Sr4Nb square pyramid,  an edgeedge with one O(1)Sr3Nb tetrahedra,  an edgeedge with one O(27)Sr3Nb tetrahedra, and  an edgeedge with one O(23)Sr4Nb trigonal bipyramid. In the twenty-sixth O site, O(26) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(13), one Sr(14), one Sr(3), and one Nb(1) atom. In the twenty-seventh O site, O(27) is bonded to one Sr(13), one Sr(14), one Sr(9), and one Nb(1) atom to form distorted OSr3Nb tetrahedra that share  a cornercorner with one O(20)Sr4Nb square pyramid,  a cornercorner with one O(25)Sr4Nb square pyramid, corners with three equivalent O(1)Sr3Nb tetrahedra,  a cornercorner with one O(23)Sr4Nb trigonal bipyramid,  an edgeedge with one O(25)Sr4Nb square pyramid, and  an edgeedge with one O(4)Sr3Nb trigonal pyramid. In the twenty-eighth O site, O(28) is bonded in a 5-coordinate geometry to one Sr(12), one Sr(13), one Sr(14), one Sr(9), and one Nb(6) atom. In the twenty-ninth O site, O(29) is bonded in a 5-coordinate geometry to one Sr(12), one Sr(13), one Sr(14), one Sr(9), and one Nb(6) atom. is represented by the CIF card [CIF]
data_Sr14Nb6O29
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.049
_cell_length_b   6.072
_cell_length_c   24.903
_cell_angle_alpha   86.912
_cell_angle_beta   84.926
_cell_angle_gamma   61.360
_symmetry_Int_Tables_number   1
_cell_volume   799.502
_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
  Sr  Sr0  1  0.073  0.427  0.070  1.0
  Sr  Sr1  1  0.432  0.716  0.238  1.0
  Sr  Sr2  1  0.424  0.790  0.100  1.0
  Sr  Sr3  1  0.778  0.088  0.165  1.0
  Sr  Sr4  1  0.757  0.164  0.466  1.0
  Sr  Sr5  1  0.773  0.046  0.307  1.0
  Sr  Sr6  1  0.102  0.411  0.346  1.0
  Sr  Sr7  1  0.746  0.669  0.681  1.0
  Sr  Sr8  1  0.958  0.040  0.843  1.0
  Sr  Sr9  1  0.056  0.009  0.701  1.0
  Sr  Sr10  1  0.367  0.915  0.547  1.0
  Sr  Sr11  1  0.329  0.369  0.777  1.0
  Sr  Sr12  1  0.305  0.347  0.916  1.0
  Sr  Sr13  1  0.649  0.688  0.941  1.0
  Nb  Nb14  1  0.943  0.987  0.001  1.0
  Nb  Nb15  1  0.123  0.550  0.503  1.0
  Nb  Nb16  1  0.103  0.403  0.205  1.0
  Nb  Nb17  1  0.408  0.355  0.621  1.0
  Nb  Nb18  1  0.400  0.715  0.394  1.0
  Nb  Nb19  1  0.656  0.695  0.810  1.0
  O  O20  1  0.997  0.281  0.978  1.0
  O  O21  1  0.341  0.162  0.145  1.0
  O  O22  1  0.793  0.520  0.158  1.0
  O  O23  1  0.734  0.832  0.034  1.0
  O  O24  1  0.868  0.644  0.264  1.0
  O  O25  1  0.976  0.076  0.074  1.0
  O  O26  1  0.405  0.294  0.251  1.0
  O  O27  1  0.178  0.664  0.167  1.0
  O  O28  1  0.693  0.403  0.375  1.0
  O  O29  1  0.224  0.757  0.331  1.0
  O  O30  1  0.030  0.131  0.236  1.0
  O  O31  1  0.454  0.996  0.383  1.0
  O  O32  1  0.075  0.273  0.489  1.0
  O  O33  1  0.796  0.792  0.521  1.0
  O  O34  1  0.439  0.272  0.542  1.0
  O  O35  1  0.067  0.704  0.425  1.0
  O  O36  1  0.156  0.670  0.583  1.0
  O  O37  1  0.421  0.631  0.474  1.0
  O  O38  1  0.722  0.327  0.635  1.0
  O  O39  1  0.905  0.380  0.764  1.0
  O  O40  1  0.393  0.760  0.759  1.0
  O  O41  1  0.398  0.045  0.639  1.0
  O  O42  1  0.751  0.931  0.762  1.0
  O  O43  1  0.204  0.534  0.683  1.0
  O  O44  1  0.954  0.615  0.856  1.0
  O  O45  1  0.256  0.685  0.990  1.0
  O  O46  1  0.747  0.050  0.939  1.0
  O  O47  1  0.562  0.469  0.856  1.0
  O  O48  1  0.408  0.987  0.857  1.0
[/CIF]
.
The material described by Sr14Nb6O29 crystallizes in the triclinic P1 space group. There are fourteen inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(26), one O(3), one O(4), one O(6), and one O(8) atom. In the second Sr site, Sr(2) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(3), one O(5), one O(7), and one O(8) atom. In the third Sr site, Sr(3) is bonded to one O(2), one O(26), one O(3), one O(4), one O(6), and one O(8) atom to form distorted SrO6 square pyramids that share  a cornercorner with one Sr(13)O6 octahedra, corners with three equivalent Nb(3)O6 octahedra,  a cornercorner with one Nb(1)O5 trigonal bipyramid, and  an edgeedge with one Nb(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 18-39°. In the fourth Sr site, Sr(4) is bonded in a 6-coordinate geometry to one O(11), one O(2), one O(3), one O(6), one O(7), and one O(8) atom. In the fifth Sr site, Sr(5) is bonded in a 6-coordinate geometry to one O(13), one O(14), one O(15), one O(16), one O(18), and one O(9) atom. In the sixth Sr site, Sr(6) is bonded to one O(10), one O(11), one O(12), one O(5), one O(7), and one O(9) atom to form SrO6 octahedra that share corners with three equivalent Nb(3)O6 octahedra and corners with three equivalent Nb(5)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 16-39°. In the seventh Sr site, Sr(7) is bonded in a 6-coordinate geometry to one O(10), one O(12), one O(16), one O(5), one O(7), and one O(9) atom. In the eighth Sr site, Sr(8) is bonded in a 6-coordinate geometry to one O(19), one O(20), one O(21), one O(22), one O(23), and one O(24) atom. In the ninth Sr site, Sr(9) is bonded in a 7-coordinate geometry to one O(20), one O(21), one O(23), one O(25), one O(27), one O(28), and one O(29) atom. In the tenth Sr site, Sr(10) is bonded to one O(19), one O(20), one O(21), one O(22), one O(23), and one O(24) atom to form SrO6 octahedra that share corners with three equivalent Nb(6)O6 octahedra and corners with three equivalent Nb(4)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 21-29°. In the eleventh Sr site, Sr(11) is bonded in a 6-coordinate geometry to one O(13), one O(14), one O(15), one O(17), one O(18), and one O(22) atom. In the twelfth Sr site, Sr(12) is bonded in a 7-coordinate geometry to one O(20), one O(21), one O(23), one O(24), one O(25), one O(28), and one O(29) atom. In the thirteenth Sr site, Sr(13) is bonded to one O(1), one O(25), one O(26), one O(27), one O(28), and one O(29) atom to form SrO6 octahedra that share corners with three equivalent Nb(6)O6 octahedra,  a cornercorner with one Sr(3)O6 square pyramid, and corners with three equivalent Nb(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 22-28°. In the fourteenth Sr site, Sr(14) is bonded in a 7-coordinate geometry to one O(1), one O(25), one O(26), one O(27), one O(28), one O(29), and one O(4) atom. There are six inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(1), one O(26), one O(27), one O(4), and one O(6) atom to form distorted NbO5 trigonal bipyramids that share corners with three equivalent Sr(13)O6 octahedra,  a cornercorner with one Sr(3)O6 square pyramid, and  an edgeedge with one Sr(3)O6 square pyramid. The corner-sharing octahedral tilt angles range from 44-59°. In the second Nb site, Nb(2) is bonded in a 6-coordinate geometry to one O(13), one O(14), one O(15), one O(16), one O(17), and one O(18) atom. In the third Nb site, Nb(3) is bonded to one O(11), one O(2), one O(3), one O(5), one O(7), and one O(8) atom to form NbO6 octahedra that share corners with three equivalent Sr(6)O6 octahedra and corners with three equivalent Sr(3)O6 square pyramids. The corner-sharing octahedral tilt angles range from 16-39°. In the fourth Nb site, Nb(4) is bonded to one O(15), one O(17), one O(19), one O(22), and one O(24) atom to form distorted NbO5 trigonal bipyramids that share corners with three equivalent Sr(10)O6 octahedra. The corner-sharing octahedral tilt angles range from 52-56°. In the fifth Nb site, Nb(5) is bonded to one O(10), one O(12), one O(16), one O(18), and one O(9) atom to form distorted NbO5 trigonal bipyramids that share corners with three equivalent Sr(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-54°. In the sixth Nb site, Nb(6) is bonded to one O(20), one O(21), one O(23), one O(25), one O(28), and one O(29) atom to form NbO6 octahedra that share corners with three equivalent Sr(10)O6 octahedra and corners with three equivalent Sr(13)O6 octahedra. The corner-sharing octahedral tilt angles range from 21-29°. There are twenty-nine inequivalent O sites. In the first O site, O(1) is bonded to one Sr(1), one Sr(13), one Sr(14), and one Nb(1) atom to form distorted OSr3Nb tetrahedra that share  a cornercorner with one O(3)Sr4Nb square pyramid, corners with three equivalent O(27)Sr3Nb tetrahedra,  a cornercorner with one O(4)Sr3Nb trigonal pyramid,  an edgeedge with one O(25)Sr4Nb square pyramid, and  an edgeedge with one O(4)Sr3Nb trigonal pyramid. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(3), one Sr(4), and one Nb(3) atom. In the third O site, O(3) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), and one Nb(3) atom to form distorted OSr4Nb square pyramids that share  a cornercorner with one O(7)Sr4Nb square pyramid,  a cornercorner with one O(1)Sr3Nb tetrahedra,  a cornercorner with one O(11)Sr3Nb tetrahedra,  a cornercorner with one O(10)Sr3Nb trigonal pyramid,  an edgeedge with one O(7)Sr4Nb square pyramid,  an edgeedge with one O(11)Sr3Nb tetrahedra, and  an edgeedge with one O(4)Sr3Nb trigonal pyramid. In the fourth O site, O(4) is bonded to one Sr(1), one Sr(14), one Sr(3), and one Nb(1) atom to form distorted OSr3Nb trigonal pyramids that share  a cornercorner with one O(25)Sr4Nb square pyramid,  a cornercorner with one O(1)Sr3Nb tetrahedra,  an edgeedge with one O(3)Sr4Nb square pyramid,  an edgeedge with one O(1)Sr3Nb tetrahedra, and  an edgeedge with one O(27)Sr3Nb tetrahedra. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(6), one Sr(7), and one Nb(3) atom. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to one Sr(1), one Sr(3), one Sr(4), and one Nb(1) atom. In the seventh O site, O(7) is bonded to one Sr(2), one Sr(4), one Sr(6), one Sr(7), and one Nb(3) atom to form distorted OSr4Nb square pyramids that share  a cornercorner with one O(3)Sr4Nb square pyramid,  a cornercorner with one O(16)Sr2Nb2 tetrahedra, corners with two equivalent O(11)Sr3Nb tetrahedra, corners with two equivalent O(9)Sr3Nb tetrahedra,  a cornercorner with one O(10)Sr3Nb trigonal pyramid,  an edgeedge with one O(3)Sr4Nb square pyramid,  an edgeedge with one O(11)Sr3Nb tetrahedra, and  an edgeedge with one O(10)Sr3Nb trigonal pyramid. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Sr(4), and one Nb(3) atom. In the ninth O site, O(9) is bonded to one Sr(5), one Sr(6), one Sr(7), and one Nb(5) atom to form distorted OSr3Nb tetrahedra that share corners with two equivalent O(7)Sr4Nb square pyramids,  a cornercorner with one O(15)Sr2Nb2 tetrahedra,  a cornercorner with one O(11)Sr3Nb tetrahedra, corners with three equivalent O(16)Sr2Nb2 tetrahedra, corners with three equivalent O(10)Sr3Nb trigonal pyramids, and  an edgeedge with one O(18)Sr2Nb2 trigonal pyramid. In the tenth O site, O(10) is bonded to one Sr(2), one Sr(6), one Sr(7), and one Nb(5) atom to form distorted OSr3Nb trigonal pyramids that share  a cornercorner with one O(3)Sr4Nb square pyramid,  a cornercorner with one O(7)Sr4Nb square pyramid, corners with three equivalent O(9)Sr3Nb tetrahedra,  a cornercorner with one O(18)Sr2Nb2 trigonal pyramid,  an edgeedge with one O(7)Sr4Nb square pyramid,  an edgeedge with one O(16)Sr2Nb2 tetrahedra, and  an edgeedge with one O(11)Sr3Nb tetrahedra. In the eleventh O site, O(11) is bonded to one Sr(2), one Sr(4), one Sr(6), and one Nb(3) atom to form distorted OSr3Nb tetrahedra that share  a cornercorner with one O(3)Sr4Nb square pyramid, corners with two equivalent O(7)Sr4Nb square pyramids,  a cornercorner with one O(9)Sr3Nb tetrahedra,  an edgeedge with one O(3)Sr4Nb square pyramid,  an edgeedge with one O(7)Sr4Nb square pyramid, and  an edgeedge with one O(10)Sr3Nb trigonal pyramid. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Sr(6), one Sr(7), and one Nb(5) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal non-coplanar geometry to one Sr(11), one Sr(5), and one Nb(2) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to one Sr(11), one Sr(5), and one Nb(2) atom. In the fifteenth O site, O(15) is bonded to one Sr(11), one Sr(5), one Nb(2), and one Nb(4) atom to form OSr2Nb2 tetrahedra that share  a cornercorner with one O(9)Sr3Nb tetrahedra, corners with two equivalent O(16)Sr2Nb2 tetrahedra,  a cornercorner with one O(18)Sr2Nb2 trigonal pyramid,  an edgeedge with one O(22)Sr3Nb tetrahedra, and  an edgeedge with one O(18)Sr2Nb2 trigonal pyramid. In the sixteenth O site, O(16) is bonded to one Sr(5), one Sr(7), one Nb(2), and one Nb(5) atom to form distorted OSr2Nb2 tetrahedra that share  a cornercorner with one O(7)Sr4Nb square pyramid, corners with two equivalent O(15)Sr2Nb2 tetrahedra, corners with three equivalent O(9)Sr3Nb tetrahedra,  a cornercorner with one O(18)Sr2Nb2 trigonal pyramid,  an edgeedge with one O(18)Sr2Nb2 trigonal pyramid, and  an edgeedge with one O(10)Sr3Nb trigonal pyramid. In the seventeenth O site, O(17) is bonded in a trigonal non-coplanar geometry to one Sr(11), one Nb(2), and one Nb(4) atom. In the eighteenth O site, O(18) is bonded to one Sr(11), one Sr(5), one Nb(2), and one Nb(5) atom to form distorted OSr2Nb2 trigonal pyramids that share  a cornercorner with one O(15)Sr2Nb2 tetrahedra,  a cornercorner with one O(16)Sr2Nb2 tetrahedra,  a cornercorner with one O(22)Sr3Nb tetrahedra,  a cornercorner with one O(10)Sr3Nb trigonal pyramid,  an edgeedge with one O(15)Sr2Nb2 tetrahedra,  an edgeedge with one O(16)Sr2Nb2 tetrahedra, and  an edgeedge with one O(9)Sr3Nb tetrahedra. In the nineteenth O site, O(19) is bonded in a 3-coordinate geometry to one Sr(10), one Sr(8), and one Nb(4) atom. In the twentieth O site, O(20) is bonded to one Sr(10), one Sr(12), one Sr(8), one Sr(9), and one Nb(6) atom to form distorted OSr4Nb square pyramids that share  a cornercorner with one O(25)Sr4Nb square pyramid,  a cornercorner with one O(27)Sr3Nb tetrahedra, corners with two equivalent O(22)Sr3Nb tetrahedra,  a cornercorner with one O(23)Sr4Nb trigonal bipyramid,  an edgeedge with one O(25)Sr4Nb square pyramid, and edges with two equivalent O(23)Sr4Nb trigonal bipyramids. In the twenty-first O site, O(21) is bonded in a 5-coordinate geometry to one Sr(10), one Sr(12), one Sr(8), one Sr(9), and one Nb(6) atom. In the twenty-second O site, O(22) is bonded to one Sr(10), one Sr(11), one Sr(8), and one Nb(4) atom to form OSr3Nb tetrahedra that share corners with two equivalent O(20)Sr4Nb square pyramids, corners with two equivalent O(23)Sr4Nb trigonal bipyramids,  a cornercorner with one O(18)Sr2Nb2 trigonal pyramid, and  an edgeedge with one O(15)Sr2Nb2 tetrahedra. In the twenty-third O site, O(23) is bonded to one Sr(10), one Sr(12), one Sr(8), one Sr(9), and one Nb(6) atom to form distorted OSr4Nb trigonal bipyramids that share  a cornercorner with one O(20)Sr4Nb square pyramid,  a cornercorner with one O(25)Sr4Nb square pyramid,  a cornercorner with one O(27)Sr3Nb tetrahedra, corners with two equivalent O(22)Sr3Nb tetrahedra,  an edgeedge with one O(25)Sr4Nb square pyramid, and edges with two equivalent O(20)Sr4Nb square pyramids. In the twenty-fourth O site, O(24) is bonded in a 4-coordinate geometry to one Sr(10), one Sr(12), one Sr(8), and one Nb(4) atom. In the twenty-fifth O site, O(25) is bonded to one Sr(12), one Sr(13), one Sr(14), one Sr(9), and one Nb(6) atom to form distorted OSr4Nb square pyramids that share  a cornercorner with one O(20)Sr4Nb square pyramid,  a cornercorner with one O(27)Sr3Nb tetrahedra,  a cornercorner with one O(23)Sr4Nb trigonal bipyramid,  a cornercorner with one O(4)Sr3Nb trigonal pyramid,  an edgeedge with one O(20)Sr4Nb square pyramid,  an edgeedge with one O(1)Sr3Nb tetrahedra,  an edgeedge with one O(27)Sr3Nb tetrahedra, and  an edgeedge with one O(23)Sr4Nb trigonal bipyramid. In the twenty-sixth O site, O(26) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(13), one Sr(14), one Sr(3), and one Nb(1) atom. In the twenty-seventh O site, O(27) is bonded to one Sr(13), one Sr(14), one Sr(9), and one Nb(1) atom to form distorted OSr3Nb tetrahedra that share  a cornercorner with one O(20)Sr4Nb square pyramid,  a cornercorner with one O(25)Sr4Nb square pyramid, corners with three equivalent O(1)Sr3Nb tetrahedra,  a cornercorner with one O(23)Sr4Nb trigonal bipyramid,  an edgeedge with one O(25)Sr4Nb square pyramid, and  an edgeedge with one O(4)Sr3Nb trigonal pyramid. In the twenty-eighth O site, O(28) is bonded in a 5-coordinate geometry to one Sr(12), one Sr(13), one Sr(14), one Sr(9), and one Nb(6) atom. In the twenty-ninth O site, O(29) is bonded in a 5-coordinate geometry to one Sr(12), one Sr(13), one Sr(14), one Sr(9), and one Nb(6) atom. is represented by the CIF card [CIF]
data_Sr14Nb6O29
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.049
_cell_length_b   6.072
_cell_length_c   24.903
_cell_angle_alpha   86.912
_cell_angle_beta   84.926
_cell_angle_gamma   61.360
_symmetry_Int_Tables_number   1
_cell_volume   799.502
_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
  Sr  Sr0  1  0.073  0.427  0.070  1.0
  Sr  Sr1  1  0.432  0.716  0.238  1.0
  Sr  Sr2  1  0.424  0.790  0.100  1.0
  Sr  Sr3  1  0.778  0.088  0.165  1.0
  Sr  Sr4  1  0.757  0.164  0.466  1.0
  Sr  Sr5  1  0.773  0.046  0.307  1.0
  Sr  Sr6  1  0.102  0.411  0.346  1.0
  Sr  Sr7  1  0.746  0.669  0.681  1.0
  Sr  Sr8  1  0.958  0.040  0.843  1.0
  Sr  Sr9  1  0.056  0.009  0.701  1.0
  Sr  Sr10  1  0.367  0.915  0.547  1.0
  Sr  Sr11  1  0.329  0.369  0.777  1.0
  Sr  Sr12  1  0.305  0.347  0.916  1.0
  Sr  Sr13  1  0.649  0.688  0.941  1.0
  Nb  Nb14  1  0.943  0.987  0.001  1.0
  Nb  Nb15  1  0.123  0.550  0.503  1.0
  Nb  Nb16  1  0.103  0.403  0.205  1.0
  Nb  Nb17  1  0.408  0.355  0.621  1.0
  Nb  Nb18  1  0.400  0.715  0.394  1.0
  Nb  Nb19  1  0.656  0.695  0.810  1.0
  O  O20  1  0.997  0.281  0.978  1.0
  O  O21  1  0.341  0.162  0.145  1.0
  O  O22  1  0.793  0.520  0.158  1.0
  O  O23  1  0.734  0.832  0.034  1.0
  O  O24  1  0.868  0.644  0.264  1.0
  O  O25  1  0.976  0.076  0.074  1.0
  O  O26  1  0.405  0.294  0.251  1.0
  O  O27  1  0.178  0.664  0.167  1.0
  O  O28  1  0.693  0.403  0.375  1.0
  O  O29  1  0.224  0.757  0.331  1.0
  O  O30  1  0.030  0.131  0.236  1.0
  O  O31  1  0.454  0.996  0.383  1.0
  O  O32  1  0.075  0.273  0.489  1.0
  O  O33  1  0.796  0.792  0.521  1.0
  O  O34  1  0.439  0.272  0.542  1.0
  O  O35  1  0.067  0.704  0.425  1.0
  O  O36  1  0.156  0.670  0.583  1.0
  O  O37  1  0.421  0.631  0.474  1.0
  O  O38  1  0.722  0.327  0.635  1.0
  O  O39  1  0.905  0.380  0.764  1.0
  O  O40  1  0.393  0.760  0.759  1.0
  O  O41  1  0.398  0.045  0.639  1.0
  O  O42  1  0.751  0.931  0.762  1.0
  O  O43  1  0.204  0.534  0.683  1.0
  O  O44  1  0.954  0.615  0.856  1.0
  O  O45  1  0.256  0.685  0.990  1.0
  O  O46  1  0.747  0.050  0.939  1.0
  O  O47  1  0.562  0.469  0.856  1.0
  O  O48  1  0.408  0.987  0.857  1.0
[/CIF]
.