The material structure described by Sr2TaCu2AlO7 crystallizes in the triclinic P1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 4-coordinate geometry to one O(1), one O(11), one O(3), one O(7), and two equivalent O(13) atoms. In the second Sr site, Sr(2) is bonded in a 6-coordinate geometry to one O(12), one O(2), one O(4), one O(8), and two equivalent O(14) atoms. In the third Sr site, Sr(3) is bonded in a 6-coordinate geometry to one O(13), one O(2), one O(5), one O(9), and two equivalent O(11) atoms. In the fourth Sr site, Sr(4) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(4), one O(6), one O(8), two equivalent O(12), and two equivalent O(14) atoms. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one O(1), one O(11), one O(14), and one O(2) atom to form distorted corner-sharing TaO4 trigonal pyramids. In the second Ta site, Ta(2) is bonded to one O(1), one O(12), one O(13), and one O(2) atom to form corner-sharing TaO4 trigonal pyramids. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a rectangular see-saw-like geometry to one O(3), one O(5), one O(7), and one O(9) atom. In the second Cu site, Cu(2) is bonded in a rectangular see-saw-like geometry to one O(10), one O(4), one O(6), and one O(8) atom. In the third Cu site, Cu(3) is bonded in a rectangular see-saw-like geometry to one O(3), one O(5), one O(7), and one O(9) atom. In the fourth Cu site, Cu(4) is bonded in a rectangular see-saw-like geometry to one O(10), one O(4), one O(6), and one O(8) atom. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a distorted tetrahedral geometry to one O(10), one O(5), one O(6), and one O(9) atom. In the second Al site, Al(2) is bonded in a distorted tetrahedral geometry to one O(3), one O(4), one O(7), and one O(8) atom. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Sr(1), one Sr(4), one Ta(1), and one Ta(2) atom. In the second O site, O(2) is bonded to one Sr(2), one Sr(3), one Ta(1), and one Ta(2) atom to form distorted corner-sharing OSr2Ta2 trigonal pyramids. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Sr(1), one Cu(1), one Cu(3), and one Al(2) atom. In the fourth O site, O(4) is bonded to one Sr(2), one Sr(4), one Cu(2), one Cu(4), and one Al(2) atom to form distorted corner-sharing OSr2AlCu2 trigonal pyramids. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Sr(3), one Cu(1), one Cu(3), and one Al(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(4), one Cu(2), one Cu(4), and one Al(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Sr(1), one Cu(1), one Cu(3), and one Al(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(4), one Cu(2), one Cu(4), and one Al(2) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Sr(3), one Cu(1), one Cu(3), and one Al(1) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Sr(4), one Cu(2), one Cu(4), and one Al(1) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Sr(1), two equivalent Sr(3), and one Ta(1) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(4), and one Ta(2) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one Sr(3), two equivalent Sr(1), and one Ta(2) atom. In the fourteenth O site, O(14) is bonded in a 1-coordinate geometry to two equivalent Sr(2), two equivalent Sr(4), and one Ta(1) atom. is represented by the CIF card [CIF]
data_Sr2TaAlCu2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.480
_cell_length_b   5.644
_cell_length_c   12.333
_cell_angle_alpha   102.281
_cell_angle_beta   102.057
_cell_angle_gamma   92.477
_symmetry_Int_Tables_number   1
_cell_volume   362.943
_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
  Sr  Sr0  1  0.654  0.616  0.275  1.0
  Sr  Sr1  1  0.369  0.382  0.729  1.0
  Sr  Sr2  1  0.152  0.163  0.271  1.0
  Sr  Sr3  1  0.872  0.840  0.725  1.0
  Ta  Ta4  1  0.690  0.165  0.500  1.0
  Ta  Ta5  1  0.275  0.831  0.500  1.0
  Al  Al6  1  0.017  0.011  0.997  1.0
  Al  Al7  1  0.496  0.482  0.003  1.0
  Cu  Cu8  1  0.063  0.570  0.107  1.0
  Cu  Cu9  1  0.946  0.443  0.893  1.0
  Cu  Cu10  1  0.574  0.044  0.107  1.0
  Cu  Cu11  1  0.457  0.938  0.893  1.0
  O  O12  1  0.924  0.905  0.502  1.0
  O  O13  1  0.327  0.191  0.499  1.0
  O  O14  1  0.749  0.382  0.106  1.0
  O  O15  1  0.630  0.610  0.899  1.0
  O  O16  1  0.261  0.232  0.101  1.0
  O  O17  1  0.131  0.774  0.895  1.0
  O  O18  1  0.399  0.719  0.111  1.0
  O  O19  1  0.264  0.266  0.890  1.0
  O  O20  1  0.900  0.895  0.108  1.0
  O  O21  1  0.777  0.106  0.889  1.0
  O  O22  1  0.682  0.215  0.353  1.0
  O  O23  1  0.374  0.754  0.642  1.0
  O  O24  1  0.238  0.617  0.359  1.0
  O  O25  1  0.823  0.360  0.647  1.0
[/CIF]
.
The material structure described by Sr2TaCu2AlO7 crystallizes in the triclinic P1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 4-coordinate geometry to one O(1), one O(11), one O(3), one O(7), and two equivalent O(13) atoms. In the second Sr site, Sr(2) is bonded in a 6-coordinate geometry to one O(12), one O(2), one O(4), one O(8), and two equivalent O(14) atoms. In the third Sr site, Sr(3) is bonded in a 6-coordinate geometry to one O(13), one O(2), one O(5), one O(9), and two equivalent O(11) atoms. In the fourth Sr site, Sr(4) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(4), one O(6), one O(8), two equivalent O(12), and two equivalent O(14) atoms. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one O(1), one O(11), one O(14), and one O(2) atom to form distorted corner-sharing TaO4 trigonal pyramids. In the second Ta site, Ta(2) is bonded to one O(1), one O(12), one O(13), and one O(2) atom to form corner-sharing TaO4 trigonal pyramids. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a rectangular see-saw-like geometry to one O(3), one O(5), one O(7), and one O(9) atom. In the second Cu site, Cu(2) is bonded in a rectangular see-saw-like geometry to one O(10), one O(4), one O(6), and one O(8) atom. In the third Cu site, Cu(3) is bonded in a rectangular see-saw-like geometry to one O(3), one O(5), one O(7), and one O(9) atom. In the fourth Cu site, Cu(4) is bonded in a rectangular see-saw-like geometry to one O(10), one O(4), one O(6), and one O(8) atom. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a distorted tetrahedral geometry to one O(10), one O(5), one O(6), and one O(9) atom. In the second Al site, Al(2) is bonded in a distorted tetrahedral geometry to one O(3), one O(4), one O(7), and one O(8) atom. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Sr(1), one Sr(4), one Ta(1), and one Ta(2) atom. In the second O site, O(2) is bonded to one Sr(2), one Sr(3), one Ta(1), and one Ta(2) atom to form distorted corner-sharing OSr2Ta2 trigonal pyramids. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Sr(1), one Cu(1), one Cu(3), and one Al(2) atom. In the fourth O site, O(4) is bonded to one Sr(2), one Sr(4), one Cu(2), one Cu(4), and one Al(2) atom to form distorted corner-sharing OSr2AlCu2 trigonal pyramids. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Sr(3), one Cu(1), one Cu(3), and one Al(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(4), one Cu(2), one Cu(4), and one Al(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Sr(1), one Cu(1), one Cu(3), and one Al(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(4), one Cu(2), one Cu(4), and one Al(2) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Sr(3), one Cu(1), one Cu(3), and one Al(1) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Sr(4), one Cu(2), one Cu(4), and one Al(1) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Sr(1), two equivalent Sr(3), and one Ta(1) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(4), and one Ta(2) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one Sr(3), two equivalent Sr(1), and one Ta(2) atom. In the fourteenth O site, O(14) is bonded in a 1-coordinate geometry to two equivalent Sr(2), two equivalent Sr(4), and one Ta(1) atom. is represented by the CIF card [CIF]
data_Sr2TaAlCu2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.480
_cell_length_b   5.644
_cell_length_c   12.333
_cell_angle_alpha   102.281
_cell_angle_beta   102.057
_cell_angle_gamma   92.477
_symmetry_Int_Tables_number   1
_cell_volume   362.943
_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
  Sr  Sr0  1  0.654  0.616  0.275  1.0
  Sr  Sr1  1  0.369  0.382  0.729  1.0
  Sr  Sr2  1  0.152  0.163  0.271  1.0
  Sr  Sr3  1  0.872  0.840  0.725  1.0
  Ta  Ta4  1  0.690  0.165  0.500  1.0
  Ta  Ta5  1  0.275  0.831  0.500  1.0
  Al  Al6  1  0.017  0.011  0.997  1.0
  Al  Al7  1  0.496  0.482  0.003  1.0
  Cu  Cu8  1  0.063  0.570  0.107  1.0
  Cu  Cu9  1  0.946  0.443  0.893  1.0
  Cu  Cu10  1  0.574  0.044  0.107  1.0
  Cu  Cu11  1  0.457  0.938  0.893  1.0
  O  O12  1  0.924  0.905  0.502  1.0
  O  O13  1  0.327  0.191  0.499  1.0
  O  O14  1  0.749  0.382  0.106  1.0
  O  O15  1  0.630  0.610  0.899  1.0
  O  O16  1  0.261  0.232  0.101  1.0
  O  O17  1  0.131  0.774  0.895  1.0
  O  O18  1  0.399  0.719  0.111  1.0
  O  O19  1  0.264  0.266  0.890  1.0
  O  O20  1  0.900  0.895  0.108  1.0
  O  O21  1  0.777  0.106  0.889  1.0
  O  O22  1  0.682  0.215  0.353  1.0
  O  O23  1  0.374  0.754  0.642  1.0
  O  O24  1  0.238  0.617  0.359  1.0
  O  O25  1  0.823  0.360  0.647  1.0
[/CIF]
.