The compound described by Sr2La6FeCu7O20 crystallizes in the monoclinic Pm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 10-coordinate geometry to one O(11), one O(12), one O(14), one O(7), two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms. In the second Sr site, Sr(2) is bonded in a 10-coordinate geometry to one O(10), one O(13), one O(8), one O(9), two equivalent O(1), two equivalent O(19), and two equivalent O(2) atoms. There are six inequivalent La sites. In the first La site, La(1) is bonded in a distorted body-centered cubic geometry to one O(11), one O(7), one O(8), one O(9), two equivalent O(15), and two equivalent O(20) atoms. In the second La site, La(2) is bonded in a 10-coordinate geometry to one O(12), one O(13), one O(7), one O(8), two equivalent O(16), two equivalent O(17), and two equivalent O(3) atoms. In the third La site, La(3) is bonded in a 8-coordinate geometry to one O(13), one O(14), one O(7), one O(9), two equivalent O(2), and two equivalent O(6) atoms. In the fourth La site, La(4) is bonded in a 10-coordinate geometry to one O(10), one O(11), one O(12), one O(8), two equivalent O(1), two equivalent O(15), and two equivalent O(4) atoms. In the fifth La site, La(5) is bonded in a 10-coordinate geometry to one O(10), one O(11), one O(14), one O(9), two equivalent O(18), two equivalent O(19), and two equivalent O(5) atoms. In the sixth La site, La(6) is bonded in a 10-coordinate geometry to one O(10), one O(12), one O(13), one O(14), two equivalent O(17), two equivalent O(18), and two equivalent O(4) atoms. Fe(1) is bonded to one O(16), one O(20), one O(3), one O(6), and two equivalent O(7) atoms to form FeO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra,  a cornercorner with one Cu(3)O5 square pyramid,  a cornercorner with one Cu(4)O5 square pyramid,  a cornercorner with one Cu(5)O5 square pyramid, and  a cornercorner with one Cu(6)O5 square pyramid. The corner-sharing octahedral tilt angles are 8°. There are seven inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a square co-planar geometry to one O(15), one O(5), and two equivalent O(11) atoms. In the second Cu site, Cu(2) is bonded in a square co-planar geometry to one O(17), one O(2), and two equivalent O(13) atoms. In the third Cu site, Cu(3) is bonded to one O(19), one O(2), one O(20), and two equivalent O(9) atoms to form CuO5 square pyramids that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Cu(7)O6 octahedra, and corners with two equivalent Cu(3)O5 square pyramids. The corner-sharing octahedral tilt angles range from 20-24°. In the fourth Cu site, Cu(4) is bonded to one O(18), one O(5), one O(6), and two equivalent O(14) atoms to form CuO5 square pyramids that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Cu(7)O6 octahedra, and corners with two equivalent Cu(4)O5 square pyramids. The corner-sharing octahedral tilt angles range from 20-24°. In the fifth Cu site, Cu(5) is bonded to one O(17), one O(3), one O(4), and two equivalent O(12) atoms to form CuO5 square pyramids that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Cu(7)O6 octahedra, and corners with two equivalent Cu(5)O5 square pyramids. The corner-sharing octahedral tilt angles range from 15-20°. In the sixth Cu site, Cu(6) is bonded to one O(1), one O(15), one O(16), and two equivalent O(8) atoms to form CuO5 square pyramids that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Cu(7)O6 octahedra, and corners with two equivalent Cu(6)O5 square pyramids. The corner-sharing octahedral tilt angles range from 9-26°. In the seventh Cu site, Cu(7) is bonded to one O(1), one O(18), one O(19), one O(4), and two equivalent O(10) atoms to form CuO6 octahedra that share corners with two equivalent Cu(7)O6 octahedra,  a cornercorner with one Cu(3)O5 square pyramid,  a cornercorner with one Cu(4)O5 square pyramid,  a cornercorner with one Cu(5)O5 square pyramid, and  a cornercorner with one Cu(6)O5 square pyramid. The corner-sharing octahedral tilt angles are 3°. There are twenty inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(2), two equivalent La(4), one Cu(6), and one Cu(7) atom to form distorted OSr2La2Cu2 octahedra that share corners with two equivalent O(15)La4Cu2 octahedra, corners with two equivalent O(2)Sr2La2Cu2 octahedra, corners with two equivalent O(11)SrLa3Cu2 octahedra, corners with two equivalent O(12)SrLa3Cu2 octahedra, corners with two equivalent O(13)SrLa3Cu2 octahedra, corners with two equivalent O(9)SrLa3Cu2 octahedra,  an edgeedge with one O(2)Sr2La2Cu2 octahedra, edges with two equivalent O(1)Sr2La2Cu2 octahedra,  a faceface with one O(15)La4Cu2 octahedra, faces with two equivalent O(10)SrLa3Cu2 octahedra, and faces with two equivalent O(8)SrLa3Cu2 octahedra. The corner-sharing octahedral tilt angles range from 13-71°. In the second O site, O(2) is bonded to two equivalent Sr(2), two equivalent La(3), one Cu(2), and one Cu(3) atom to form distorted OSr2La2Cu2 octahedra that share  a cornercorner with one O(17)La4Cu2 octahedra, corners with two equivalent O(1)Sr2La2Cu2 octahedra, corners with two equivalent O(10)SrLa3Cu2 octahedra, corners with two equivalent O(14)SrLa3Cu2 octahedra, corners with two equivalent O(8)SrLa3Cu2 octahedra, corners with two equivalent O(7)SrLa3Fe2 octahedra,  an edgeedge with one O(1)Sr2La2Cu2 octahedra, edges with two equivalent O(2)Sr2La2Cu2 octahedra, faces with two equivalent O(13)SrLa3Cu2 octahedra, and faces with two equivalent O(9)SrLa3Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-71°. In the third O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent La(2), one Fe(1), and one Cu(5) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent La(4), two equivalent La(6), one Cu(5), and one Cu(7) atom. In the fifth O site, O(5) is bonded to two equivalent Sr(1), two equivalent La(5), one Cu(1), and one Cu(4) atom to form distorted OSr2La2Cu2 octahedra that share  a cornercorner with one O(15)La4Cu2 octahedra, corners with two equivalent O(10)SrLa3Cu2 octahedra, corners with two equivalent O(12)SrLa3Cu2 octahedra, corners with two equivalent O(9)SrLa3Cu2 octahedra, corners with two equivalent O(7)SrLa3Fe2 octahedra, edges with two equivalent O(5)Sr2La2Cu2 octahedra, faces with two equivalent O(11)SrLa3Cu2 octahedra, and faces with two equivalent O(14)SrLa3Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-72°. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to two equivalent Sr(1), two equivalent La(3), one Fe(1), and one Cu(4) atom. In the seventh O site, O(7) is bonded to one Sr(1), one La(1), one La(2), one La(3), and two equivalent Fe(1) atoms to form distorted OSrLa3Fe2 octahedra that share corners with two equivalent O(15)La4Cu2 octahedra, corners with two equivalent O(17)La4Cu2 octahedra, corners with two equivalent O(2)Sr2La2Cu2 octahedra, corners with two equivalent O(5)Sr2La2Cu2 octahedra, corners with two equivalent O(11)SrLa3Cu2 octahedra, corners with two equivalent O(13)SrLa3Cu2 octahedra, corners with two equivalent O(7)SrLa3Fe2 octahedra,  an edgeedge with one O(12)SrLa3Cu2 octahedra,  an edgeedge with one O(14)SrLa3Cu2 octahedra,  an edgeedge with one O(8)SrLa3Cu2 octahedra, and  an edgeedge with one O(9)SrLa3Cu2 octahedra. The corner-sharing octahedral tilt angles range from 8-59°. In the eighth O site, O(8) is bonded to one Sr(2), one La(1), one La(2), one La(4), and two equivalent Cu(6) atoms to form distorted OSrLa3Cu2 octahedra that share corners with two equivalent O(17)La4Cu2 octahedra, corners with two equivalent O(2)Sr2La2Cu2 octahedra, corners with two equivalent O(12)SrLa3Cu2 octahedra, corners with two equivalent O(8)SrLa3Cu2 octahedra, corners with two equivalent O(9)SrLa3Cu2 octahedra,  an edgeedge with one O(10)SrLa3Cu2 octahedra,  an edgeedge with one O(11)SrLa3Cu2 octahedra,  an edgeedge with one O(13)SrLa3Cu2 octahedra,  an edgeedge with one O(7)SrLa3Fe2 octahedra, faces with two equivalent O(15)La4Cu2 octahedra, and faces with two equivalent O(1)Sr2La2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-71°. In the ninth O site, O(9) is bonded to one Sr(2), one La(1), one La(3), one La(5), and two equivalent Cu(3) atoms to form distorted OSrLa3Cu2 octahedra that share corners with two equivalent O(15)La4Cu2 octahedra, corners with two equivalent O(1)Sr2La2Cu2 octahedra, corners with two equivalent O(5)Sr2La2Cu2 octahedra, corners with two equivalent O(14)SrLa3Cu2 octahedra, corners with two equivalent O(8)SrLa3Cu2 octahedra, corners with two equivalent O(9)SrLa3Cu2 octahedra,  an edgeedge with one O(10)SrLa3Cu2 octahedra,  an edgeedge with one O(11)SrLa3Cu2 octahedra,  an edgeedge with one O(13)SrLa3Cu2 octahedra,  an edgeedge with one O(7)SrLa3Fe2 octahedra, and faces with two equivalent O(2)Sr2La2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-72°. In the tenth O site, O(10) is bonded to one Sr(2), one La(4), one La(5), one La(6), and two equivalent Cu(7) atoms to form OSrLa3Cu2 octahedra that share corners with two equivalent O(15)La4Cu2 octahedra, corners with two equivalent O(17)La4Cu2 octahedra, corners with two equivalent O(2)Sr2La2Cu2 octahedra, corners with two equivalent O(5)Sr2La2Cu2 octahedra, corners with two equivalent O(10)SrLa3Cu2 octahedra, corners with two equivalent O(11)SrLa3Cu2 octahedra, corners with two equivalent O(13)SrLa3Cu2 octahedra,  an edgeedge with one O(12)SrLa3Cu2 octahedra,  an edgeedge with one O(14)SrLa3Cu2 octahedra,  an edgeedge with one O(8)SrLa3Cu2 octahedra,  an edgeedge with one O(9)SrLa3Cu2 octahedra, and faces with two equivalent O(1)Sr2La2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 3-57°. In the eleventh O site, O(11) is bonded to one Sr(1), one La(1), one La(4), one La(5), and two equivalent Cu(1) atoms to form distorted OSrLa3Cu2 octahedra that share corners with two equivalent O(1)Sr2La2Cu2 octahedra, corners with two equivalent O(10)SrLa3Cu2 octahedra, corners with two equivalent O(11)SrLa3Cu2 octahedra, corners with two equivalent O(7)SrLa3Fe2 octahedra,  an edgeedge with one O(12)SrLa3Cu2 octahedra,  an edgeedge with one O(14)SrLa3Cu2 octahedra,  an edgeedge with one O(8)SrLa3Cu2 octahedra,  an edgeedge with one O(9)SrLa3Cu2 octahedra, faces with two equivalent O(15)La4Cu2 octahedra, and faces with two equivalent O(5)Sr2La2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 2-57°. In the twelfth O site, O(12) is bonded to one Sr(1), one La(2), one La(4), one La(6), and two equivalent Cu(5) atoms to form distorted OSrLa3Cu2 octahedra that share corners with two equivalent O(15)La4Cu2 octahedra, corners with two equivalent O(1)Sr2La2Cu2 octahedra, corners with two equivalent O(5)Sr2La2Cu2 octahedra, corners with two equivalent O(12)SrLa3Cu2 octahedra, corners with two equivalent O(14)SrLa3Cu2 octahedra, corners with two equivalent O(8)SrLa3Cu2 octahedra,  an edgeedge with one O(10)SrLa3Cu2 octahedra,  an edgeedge with one O(11)SrLa3Cu2 octahedra,  an edgeedge with one O(13)SrLa3Cu2 octahedra,  an edgeedge with one O(7)SrLa3Fe2 octahedra, and faces with two equivalent O(17)La4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 2-73°. In the thirteenth O site, O(13) is bonded to one Sr(2), one La(2), one La(3), one La(6), and two equivalent Cu(2) atoms to form distorted OSrLa3Cu2 octahedra that share corners with two equivalent O(1)Sr2La2Cu2 octahedra, corners with two equivalent O(10)SrLa3Cu2 octahedra, corners with two equivalent O(13)SrLa3Cu2 octahedra, corners with two equivalent O(7)SrLa3Fe2 octahedra,  an edgeedge with one O(12)SrLa3Cu2 octahedra,  an edgeedge with one O(14)SrLa3Cu2 octahedra,  an edgeedge with one O(8)SrLa3Cu2 octahedra,  an edgeedge with one O(9)SrLa3Cu2 octahedra, faces with two equivalent O(17)La4Cu2 octahedra, and faces with two equivalent O(2)Sr2La2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 3-71°. In the fourteenth O site, O(14) is bonded to one Sr(1), one La(3), one La(5), one La(6), and two equivalent Cu(4) atoms to form distorted OSrLa3Cu2 octahedra that share corners with two equivalent O(17)La4Cu2 octahedra, corners with two equivalent O(2)Sr2La2Cu2 octahedra, corners with two equivalent O(12)SrLa3Cu2 octahedra, corners with two equivalent O(14)SrLa3Cu2 octahedra, corners with two equivalent O(9)SrLa3Cu2 octahedra,  an edgeedge with one O(10)SrLa3Cu2 octahedra,  an edgeedge with one O(11)SrLa3Cu2 octahedra,  an edgeedge with one O(13)SrLa3Cu2 octahedra,  an edgeedge with one O(7)SrLa3Fe2 octahedra, and faces with two equivalent O(5)Sr2La2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-72°. In the fifteenth O site, O(15) is bonded to two equivalent La(1), two equivalent La(4), one Cu(1), and one Cu(6) atom to form distorted OLa4Cu2 octahedra that share  a cornercorner with one O(5)Sr2La2Cu2 octahedra, corners with two equivalent O(1)Sr2La2Cu2 octahedra, corners with two equivalent O(10)SrLa3Cu2 octahedra, corners with two equivalent O(12)SrLa3Cu2 octahedra, corners with two equivalent O(9)SrLa3Cu2 octahedra, corners with two equivalent O(7)SrLa3Fe2 octahedra, edges with two equivalent O(15)La4Cu2 octahedra,  a faceface with one O(1)Sr2La2Cu2 octahedra, faces with two equivalent O(11)SrLa3Cu2 octahedra, and faces with two equivalent O(8)SrLa3Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-73°. In the sixteenth O site, O(16) is bonded in a 4-coordinate geometry to two equivalent La(2), one Fe(1), and one Cu(6) atom. In the seventeenth O site, O(17) is bonded to two equivalent La(2), two equivalent La(6), one Cu(2), and one Cu(5) atom to form distorted OLa4Cu2 octahedra that share  a cornercorner with one O(2)Sr2La2Cu2 octahedra, corners with two equivalent O(10)SrLa3Cu2 octahedra, corners with two equivalent O(14)SrLa3Cu2 octahedra, corners with two equivalent O(8)SrLa3Cu2 octahedra, corners with two equivalent O(7)SrLa3Fe2 octahedra, edges with two equivalent O(17)La4Cu2 octahedra, faces with two equivalent O(12)SrLa3Cu2 octahedra, and faces with two equivalent O(13)SrLa3Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-72°. In the eighteenth O site, O(18) is bonded in a 4-coordinate geometry to two equivalent La(5), two equivalent La(6), one Cu(4), and one Cu(7) atom. In the nineteenth O site, O(19) is bonded in a 6-coordinate geometry to two equivalent Sr(2), two equivalent La(5), one Cu(3), and one Cu(7) atom. In the twentieth O site, O(20) is bonded in a 4-coordinate geometry to two equivalent La(1), one Fe(1), and one Cu(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2La6FeCu7O20
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.980
_cell_length_b   10.736
_cell_length_c   10.767
_cell_angle_alpha   90.017
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   460.092
_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  0.500  0.977  0.748  1.0
  Sr  Sr1  1  0.500  0.525  0.259  1.0
  La  La2  1  0.500  0.021  0.251  1.0
  La  La3  1  0.500  0.244  0.972  1.0
  La  La4  1  0.500  0.748  0.024  1.0
  La  La5  1  0.500  0.266  0.469  1.0
  La  La6  1  0.500  0.743  0.524  1.0
  La  La7  1  0.500  0.477  0.742  1.0
  Fe  Fe8  1  0.000  1.000  0.998  1.0
  Cu  Cu9  1  0.000  0.996  0.497  1.0
  Cu  Cu10  1  0.000  0.502  0.997  1.0
  Cu  Cu11  1  0.000  0.777  0.277  1.0
  Cu  Cu12  1  0.000  0.725  0.778  1.0
  Cu  Cu13  1  0.000  0.225  0.725  1.0
  Cu  Cu14  1  0.000  0.274  0.224  1.0
  Cu  Cu15  1  0.000  0.501  0.501  1.0
  O  O16  1  0.000  0.395  0.349  1.0
  O  O17  1  0.000  0.631  0.116  1.0
  O  O18  1  0.000  0.096  0.844  1.0
  O  O19  1  0.000  0.338  0.592  1.0
  O  O20  1  0.000  0.868  0.616  1.0
  O  O21  1  0.000  0.836  0.915  1.0
  O  O22  1  0.500  0.000  0.011  1.0
  O  O23  1  0.500  0.268  0.223  1.0
  O  O24  1  0.500  0.780  0.278  1.0
  O  O25  1  0.500  0.501  0.506  1.0
  O  O26  1  0.500  0.997  0.493  1.0
  O  O27  1  0.500  0.231  0.725  1.0
  O  O28  1  0.500  0.501  0.993  1.0
  O  O29  1  0.500  0.719  0.780  1.0
  O  O30  1  0.000  0.123  0.375  1.0
  O  O31  1  0.000  0.168  0.084  1.0
  O  O32  1  0.000  0.377  0.875  1.0
  O  O33  1  0.000  0.592  0.665  1.0
  O  O34  1  0.000  0.663  0.410  1.0
  O  O35  1  0.000  0.915  0.166  1.0
[/CIF]
.
The compound described by Sr2La6FeCu7O20 crystallizes in the monoclinic Pm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 10-coordinate geometry to one O(11), one O(12), one O(14), one O(7), two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms. In the second Sr site, Sr(2) is bonded in a 10-coordinate geometry to one O(10), one O(13), one O(8), one O(9), two equivalent O(1), two equivalent O(19), and two equivalent O(2) atoms. There are six inequivalent La sites. In the first La site, La(1) is bonded in a distorted body-centered cubic geometry to one O(11), one O(7), one O(8), one O(9), two equivalent O(15), and two equivalent O(20) atoms. In the second La site, La(2) is bonded in a 10-coordinate geometry to one O(12), one O(13), one O(7), one O(8), two equivalent O(16), two equivalent O(17), and two equivalent O(3) atoms. In the third La site, La(3) is bonded in a 8-coordinate geometry to one O(13), one O(14), one O(7), one O(9), two equivalent O(2), and two equivalent O(6) atoms. In the fourth La site, La(4) is bonded in a 10-coordinate geometry to one O(10), one O(11), one O(12), one O(8), two equivalent O(1), two equivalent O(15), and two equivalent O(4) atoms. In the fifth La site, La(5) is bonded in a 10-coordinate geometry to one O(10), one O(11), one O(14), one O(9), two equivalent O(18), two equivalent O(19), and two equivalent O(5) atoms. In the sixth La site, La(6) is bonded in a 10-coordinate geometry to one O(10), one O(12), one O(13), one O(14), two equivalent O(17), two equivalent O(18), and two equivalent O(4) atoms. Fe(1) is bonded to one O(16), one O(20), one O(3), one O(6), and two equivalent O(7) atoms to form FeO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra,  a cornercorner with one Cu(3)O5 square pyramid,  a cornercorner with one Cu(4)O5 square pyramid,  a cornercorner with one Cu(5)O5 square pyramid, and  a cornercorner with one Cu(6)O5 square pyramid. The corner-sharing octahedral tilt angles are 8°. There are seven inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a square co-planar geometry to one O(15), one O(5), and two equivalent O(11) atoms. In the second Cu site, Cu(2) is bonded in a square co-planar geometry to one O(17), one O(2), and two equivalent O(13) atoms. In the third Cu site, Cu(3) is bonded to one O(19), one O(2), one O(20), and two equivalent O(9) atoms to form CuO5 square pyramids that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Cu(7)O6 octahedra, and corners with two equivalent Cu(3)O5 square pyramids. The corner-sharing octahedral tilt angles range from 20-24°. In the fourth Cu site, Cu(4) is bonded to one O(18), one O(5), one O(6), and two equivalent O(14) atoms to form CuO5 square pyramids that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Cu(7)O6 octahedra, and corners with two equivalent Cu(4)O5 square pyramids. The corner-sharing octahedral tilt angles range from 20-24°. In the fifth Cu site, Cu(5) is bonded to one O(17), one O(3), one O(4), and two equivalent O(12) atoms to form CuO5 square pyramids that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Cu(7)O6 octahedra, and corners with two equivalent Cu(5)O5 square pyramids. The corner-sharing octahedral tilt angles range from 15-20°. In the sixth Cu site, Cu(6) is bonded to one O(1), one O(15), one O(16), and two equivalent O(8) atoms to form CuO5 square pyramids that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Cu(7)O6 octahedra, and corners with two equivalent Cu(6)O5 square pyramids. The corner-sharing octahedral tilt angles range from 9-26°. In the seventh Cu site, Cu(7) is bonded to one O(1), one O(18), one O(19), one O(4), and two equivalent O(10) atoms to form CuO6 octahedra that share corners with two equivalent Cu(7)O6 octahedra,  a cornercorner with one Cu(3)O5 square pyramid,  a cornercorner with one Cu(4)O5 square pyramid,  a cornercorner with one Cu(5)O5 square pyramid, and  a cornercorner with one Cu(6)O5 square pyramid. The corner-sharing octahedral tilt angles are 3°. There are twenty inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(2), two equivalent La(4), one Cu(6), and one Cu(7) atom to form distorted OSr2La2Cu2 octahedra that share corners with two equivalent O(15)La4Cu2 octahedra, corners with two equivalent O(2)Sr2La2Cu2 octahedra, corners with two equivalent O(11)SrLa3Cu2 octahedra, corners with two equivalent O(12)SrLa3Cu2 octahedra, corners with two equivalent O(13)SrLa3Cu2 octahedra, corners with two equivalent O(9)SrLa3Cu2 octahedra,  an edgeedge with one O(2)Sr2La2Cu2 octahedra, edges with two equivalent O(1)Sr2La2Cu2 octahedra,  a faceface with one O(15)La4Cu2 octahedra, faces with two equivalent O(10)SrLa3Cu2 octahedra, and faces with two equivalent O(8)SrLa3Cu2 octahedra. The corner-sharing octahedral tilt angles range from 13-71°. In the second O site, O(2) is bonded to two equivalent Sr(2), two equivalent La(3), one Cu(2), and one Cu(3) atom to form distorted OSr2La2Cu2 octahedra that share  a cornercorner with one O(17)La4Cu2 octahedra, corners with two equivalent O(1)Sr2La2Cu2 octahedra, corners with two equivalent O(10)SrLa3Cu2 octahedra, corners with two equivalent O(14)SrLa3Cu2 octahedra, corners with two equivalent O(8)SrLa3Cu2 octahedra, corners with two equivalent O(7)SrLa3Fe2 octahedra,  an edgeedge with one O(1)Sr2La2Cu2 octahedra, edges with two equivalent O(2)Sr2La2Cu2 octahedra, faces with two equivalent O(13)SrLa3Cu2 octahedra, and faces with two equivalent O(9)SrLa3Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-71°. In the third O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent La(2), one Fe(1), and one Cu(5) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent La(4), two equivalent La(6), one Cu(5), and one Cu(7) atom. In the fifth O site, O(5) is bonded to two equivalent Sr(1), two equivalent La(5), one Cu(1), and one Cu(4) atom to form distorted OSr2La2Cu2 octahedra that share  a cornercorner with one O(15)La4Cu2 octahedra, corners with two equivalent O(10)SrLa3Cu2 octahedra, corners with two equivalent O(12)SrLa3Cu2 octahedra, corners with two equivalent O(9)SrLa3Cu2 octahedra, corners with two equivalent O(7)SrLa3Fe2 octahedra, edges with two equivalent O(5)Sr2La2Cu2 octahedra, faces with two equivalent O(11)SrLa3Cu2 octahedra, and faces with two equivalent O(14)SrLa3Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-72°. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to two equivalent Sr(1), two equivalent La(3), one Fe(1), and one Cu(4) atom. In the seventh O site, O(7) is bonded to one Sr(1), one La(1), one La(2), one La(3), and two equivalent Fe(1) atoms to form distorted OSrLa3Fe2 octahedra that share corners with two equivalent O(15)La4Cu2 octahedra, corners with two equivalent O(17)La4Cu2 octahedra, corners with two equivalent O(2)Sr2La2Cu2 octahedra, corners with two equivalent O(5)Sr2La2Cu2 octahedra, corners with two equivalent O(11)SrLa3Cu2 octahedra, corners with two equivalent O(13)SrLa3Cu2 octahedra, corners with two equivalent O(7)SrLa3Fe2 octahedra,  an edgeedge with one O(12)SrLa3Cu2 octahedra,  an edgeedge with one O(14)SrLa3Cu2 octahedra,  an edgeedge with one O(8)SrLa3Cu2 octahedra, and  an edgeedge with one O(9)SrLa3Cu2 octahedra. The corner-sharing octahedral tilt angles range from 8-59°. In the eighth O site, O(8) is bonded to one Sr(2), one La(1), one La(2), one La(4), and two equivalent Cu(6) atoms to form distorted OSrLa3Cu2 octahedra that share corners with two equivalent O(17)La4Cu2 octahedra, corners with two equivalent O(2)Sr2La2Cu2 octahedra, corners with two equivalent O(12)SrLa3Cu2 octahedra, corners with two equivalent O(8)SrLa3Cu2 octahedra, corners with two equivalent O(9)SrLa3Cu2 octahedra,  an edgeedge with one O(10)SrLa3Cu2 octahedra,  an edgeedge with one O(11)SrLa3Cu2 octahedra,  an edgeedge with one O(13)SrLa3Cu2 octahedra,  an edgeedge with one O(7)SrLa3Fe2 octahedra, faces with two equivalent O(15)La4Cu2 octahedra, and faces with two equivalent O(1)Sr2La2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-71°. In the ninth O site, O(9) is bonded to one Sr(2), one La(1), one La(3), one La(5), and two equivalent Cu(3) atoms to form distorted OSrLa3Cu2 octahedra that share corners with two equivalent O(15)La4Cu2 octahedra, corners with two equivalent O(1)Sr2La2Cu2 octahedra, corners with two equivalent O(5)Sr2La2Cu2 octahedra, corners with two equivalent O(14)SrLa3Cu2 octahedra, corners with two equivalent O(8)SrLa3Cu2 octahedra, corners with two equivalent O(9)SrLa3Cu2 octahedra,  an edgeedge with one O(10)SrLa3Cu2 octahedra,  an edgeedge with one O(11)SrLa3Cu2 octahedra,  an edgeedge with one O(13)SrLa3Cu2 octahedra,  an edgeedge with one O(7)SrLa3Fe2 octahedra, and faces with two equivalent O(2)Sr2La2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-72°. In the tenth O site, O(10) is bonded to one Sr(2), one La(4), one La(5), one La(6), and two equivalent Cu(7) atoms to form OSrLa3Cu2 octahedra that share corners with two equivalent O(15)La4Cu2 octahedra, corners with two equivalent O(17)La4Cu2 octahedra, corners with two equivalent O(2)Sr2La2Cu2 octahedra, corners with two equivalent O(5)Sr2La2Cu2 octahedra, corners with two equivalent O(10)SrLa3Cu2 octahedra, corners with two equivalent O(11)SrLa3Cu2 octahedra, corners with two equivalent O(13)SrLa3Cu2 octahedra,  an edgeedge with one O(12)SrLa3Cu2 octahedra,  an edgeedge with one O(14)SrLa3Cu2 octahedra,  an edgeedge with one O(8)SrLa3Cu2 octahedra,  an edgeedge with one O(9)SrLa3Cu2 octahedra, and faces with two equivalent O(1)Sr2La2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 3-57°. In the eleventh O site, O(11) is bonded to one Sr(1), one La(1), one La(4), one La(5), and two equivalent Cu(1) atoms to form distorted OSrLa3Cu2 octahedra that share corners with two equivalent O(1)Sr2La2Cu2 octahedra, corners with two equivalent O(10)SrLa3Cu2 octahedra, corners with two equivalent O(11)SrLa3Cu2 octahedra, corners with two equivalent O(7)SrLa3Fe2 octahedra,  an edgeedge with one O(12)SrLa3Cu2 octahedra,  an edgeedge with one O(14)SrLa3Cu2 octahedra,  an edgeedge with one O(8)SrLa3Cu2 octahedra,  an edgeedge with one O(9)SrLa3Cu2 octahedra, faces with two equivalent O(15)La4Cu2 octahedra, and faces with two equivalent O(5)Sr2La2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 2-57°. In the twelfth O site, O(12) is bonded to one Sr(1), one La(2), one La(4), one La(6), and two equivalent Cu(5) atoms to form distorted OSrLa3Cu2 octahedra that share corners with two equivalent O(15)La4Cu2 octahedra, corners with two equivalent O(1)Sr2La2Cu2 octahedra, corners with two equivalent O(5)Sr2La2Cu2 octahedra, corners with two equivalent O(12)SrLa3Cu2 octahedra, corners with two equivalent O(14)SrLa3Cu2 octahedra, corners with two equivalent O(8)SrLa3Cu2 octahedra,  an edgeedge with one O(10)SrLa3Cu2 octahedra,  an edgeedge with one O(11)SrLa3Cu2 octahedra,  an edgeedge with one O(13)SrLa3Cu2 octahedra,  an edgeedge with one O(7)SrLa3Fe2 octahedra, and faces with two equivalent O(17)La4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 2-73°. In the thirteenth O site, O(13) is bonded to one Sr(2), one La(2), one La(3), one La(6), and two equivalent Cu(2) atoms to form distorted OSrLa3Cu2 octahedra that share corners with two equivalent O(1)Sr2La2Cu2 octahedra, corners with two equivalent O(10)SrLa3Cu2 octahedra, corners with two equivalent O(13)SrLa3Cu2 octahedra, corners with two equivalent O(7)SrLa3Fe2 octahedra,  an edgeedge with one O(12)SrLa3Cu2 octahedra,  an edgeedge with one O(14)SrLa3Cu2 octahedra,  an edgeedge with one O(8)SrLa3Cu2 octahedra,  an edgeedge with one O(9)SrLa3Cu2 octahedra, faces with two equivalent O(17)La4Cu2 octahedra, and faces with two equivalent O(2)Sr2La2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 3-71°. In the fourteenth O site, O(14) is bonded to one Sr(1), one La(3), one La(5), one La(6), and two equivalent Cu(4) atoms to form distorted OSrLa3Cu2 octahedra that share corners with two equivalent O(17)La4Cu2 octahedra, corners with two equivalent O(2)Sr2La2Cu2 octahedra, corners with two equivalent O(12)SrLa3Cu2 octahedra, corners with two equivalent O(14)SrLa3Cu2 octahedra, corners with two equivalent O(9)SrLa3Cu2 octahedra,  an edgeedge with one O(10)SrLa3Cu2 octahedra,  an edgeedge with one O(11)SrLa3Cu2 octahedra,  an edgeedge with one O(13)SrLa3Cu2 octahedra,  an edgeedge with one O(7)SrLa3Fe2 octahedra, and faces with two equivalent O(5)Sr2La2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-72°. In the fifteenth O site, O(15) is bonded to two equivalent La(1), two equivalent La(4), one Cu(1), and one Cu(6) atom to form distorted OLa4Cu2 octahedra that share  a cornercorner with one O(5)Sr2La2Cu2 octahedra, corners with two equivalent O(1)Sr2La2Cu2 octahedra, corners with two equivalent O(10)SrLa3Cu2 octahedra, corners with two equivalent O(12)SrLa3Cu2 octahedra, corners with two equivalent O(9)SrLa3Cu2 octahedra, corners with two equivalent O(7)SrLa3Fe2 octahedra, edges with two equivalent O(15)La4Cu2 octahedra,  a faceface with one O(1)Sr2La2Cu2 octahedra, faces with two equivalent O(11)SrLa3Cu2 octahedra, and faces with two equivalent O(8)SrLa3Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-73°. In the sixteenth O site, O(16) is bonded in a 4-coordinate geometry to two equivalent La(2), one Fe(1), and one Cu(6) atom. In the seventeenth O site, O(17) is bonded to two equivalent La(2), two equivalent La(6), one Cu(2), and one Cu(5) atom to form distorted OLa4Cu2 octahedra that share  a cornercorner with one O(2)Sr2La2Cu2 octahedra, corners with two equivalent O(10)SrLa3Cu2 octahedra, corners with two equivalent O(14)SrLa3Cu2 octahedra, corners with two equivalent O(8)SrLa3Cu2 octahedra, corners with two equivalent O(7)SrLa3Fe2 octahedra, edges with two equivalent O(17)La4Cu2 octahedra, faces with two equivalent O(12)SrLa3Cu2 octahedra, and faces with two equivalent O(13)SrLa3Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-72°. In the eighteenth O site, O(18) is bonded in a 4-coordinate geometry to two equivalent La(5), two equivalent La(6), one Cu(4), and one Cu(7) atom. In the nineteenth O site, O(19) is bonded in a 6-coordinate geometry to two equivalent Sr(2), two equivalent La(5), one Cu(3), and one Cu(7) atom. In the twentieth O site, O(20) is bonded in a 4-coordinate geometry to two equivalent La(1), one Fe(1), and one Cu(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2La6FeCu7O20
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.980
_cell_length_b   10.736
_cell_length_c   10.767
_cell_angle_alpha   90.017
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   460.092
_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  0.500  0.977  0.748  1.0
  Sr  Sr1  1  0.500  0.525  0.259  1.0
  La  La2  1  0.500  0.021  0.251  1.0
  La  La3  1  0.500  0.244  0.972  1.0
  La  La4  1  0.500  0.748  0.024  1.0
  La  La5  1  0.500  0.266  0.469  1.0
  La  La6  1  0.500  0.743  0.524  1.0
  La  La7  1  0.500  0.477  0.742  1.0
  Fe  Fe8  1  0.000  1.000  0.998  1.0
  Cu  Cu9  1  0.000  0.996  0.497  1.0
  Cu  Cu10  1  0.000  0.502  0.997  1.0
  Cu  Cu11  1  0.000  0.777  0.277  1.0
  Cu  Cu12  1  0.000  0.725  0.778  1.0
  Cu  Cu13  1  0.000  0.225  0.725  1.0
  Cu  Cu14  1  0.000  0.274  0.224  1.0
  Cu  Cu15  1  0.000  0.501  0.501  1.0
  O  O16  1  0.000  0.395  0.349  1.0
  O  O17  1  0.000  0.631  0.116  1.0
  O  O18  1  0.000  0.096  0.844  1.0
  O  O19  1  0.000  0.338  0.592  1.0
  O  O20  1  0.000  0.868  0.616  1.0
  O  O21  1  0.000  0.836  0.915  1.0
  O  O22  1  0.500  0.000  0.011  1.0
  O  O23  1  0.500  0.268  0.223  1.0
  O  O24  1  0.500  0.780  0.278  1.0
  O  O25  1  0.500  0.501  0.506  1.0
  O  O26  1  0.500  0.997  0.493  1.0
  O  O27  1  0.500  0.231  0.725  1.0
  O  O28  1  0.500  0.501  0.993  1.0
  O  O29  1  0.500  0.719  0.780  1.0
  O  O30  1  0.000  0.123  0.375  1.0
  O  O31  1  0.000  0.168  0.084  1.0
  O  O32  1  0.000  0.377  0.875  1.0
  O  O33  1  0.000  0.592  0.665  1.0
  O  O34  1  0.000  0.663  0.410  1.0
  O  O35  1  0.000  0.915  0.166  1.0
[/CIF]
.