The material described by GaSr2NdCu2O7 crystallizes in the triclinic P1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(3), one O(4), one O(7), one O(8), and two equivalent O(12) atoms. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(10), one O(11), one O(2), one O(5), one O(6), two equivalent O(13), and two equivalent O(9) atoms. In the third Sr site, Sr(3) is bonded in a 9-coordinate geometry to one O(1), one O(14), one O(3), one O(4), one O(7), two equivalent O(12), and two equivalent O(8) atoms. In the fourth Sr site, Sr(4) is bonded in a 8-coordinate geometry to one O(11), one O(13), one O(14), one O(2), one O(5), one O(6), and two equivalent O(9) atoms. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a body-centered cubic geometry to one O(1), one O(11), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom. In the second Nd site, Nd(2) is bonded in a body-centered cubic geometry to one O(1), one O(11), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one O(1), one O(3), one O(4), one O(7), and one O(8) atom to form distorted CuO5 square pyramids that share corners with four equivalent Cu(3)O5 square pyramids and  a cornercorner with one Ga(1)O4 tetrahedra. In the second Cu site, Cu(2) is bonded to one O(11), one O(13), one O(2), one O(5), and one O(6) atom to form distorted CuO5 square pyramids that share corners with four equivalent Cu(4)O5 square pyramids and  a cornercorner with one Ga(2)O4 tetrahedra. In the third Cu site, Cu(3) is bonded to one O(1), one O(12), one O(3), one O(4), and one O(7) atom to form CuO5 square pyramids that share corners with four equivalent Cu(1)O5 square pyramids and  a cornercorner with one Ga(2)O4 tetrahedra. In the fourth Cu site, Cu(4) is bonded to one O(11), one O(2), one O(5), one O(6), and one O(9) atom to form CuO5 square pyramids that share corners with four equivalent Cu(2)O5 square pyramids and  a cornercorner with one Ga(1)O4 tetrahedra. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(10), one O(14), one O(8), and one O(9) atom to form GaO4 tetrahedra that share  a cornercorner with one Cu(1)O5 square pyramid,  a cornercorner with one Cu(4)O5 square pyramid, and corners with two equivalent Ga(2)O4 tetrahedra. In the second Ga site, Ga(2) is bonded to one O(10), one O(12), one O(13), and one O(14) atom to form GaO4 tetrahedra that share  a cornercorner with one Cu(2)O5 square pyramid,  a cornercorner with one Cu(3)O5 square pyramid, and corners with two equivalent Ga(1)O4 tetrahedra. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded to one Sr(1), one Sr(3), one Nd(1), one Nd(2), one Cu(1), and one Cu(3) atom to form distorted OSr2Nd2Cu2 octahedra that share corners with two equivalent O(2)Sr2Nd2Cu2 octahedra, corners with two equivalent O(4)Sr2Nd2Cu2 octahedra, corners with two equivalent O(5)Sr2Nd2Cu2 octahedra, corners with two equivalent O(6)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(10)Sr2Ga2 tetrahedra,  a cornercorner with one O(14)Sr2Ga2 tetrahedra, edges with two equivalent O(4)Sr2Nd2Cu2 octahedra, faces with two equivalent O(3)Sr2Nd2Cu2 octahedra, and faces with two equivalent O(7)Sr2Nd2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-70°. In the second O site, O(2) is bonded to one Sr(2), one Sr(4), one Nd(1), one Nd(2), one Cu(2), and one Cu(4) atom to form distorted OSr2Nd2Cu2 octahedra that share corners with two equivalent O(1)Sr2Nd2Cu2 octahedra, corners with two equivalent O(3)Sr2Nd2Cu2 octahedra, corners with two equivalent O(4)Sr2Nd2Cu2 octahedra, corners with two equivalent O(6)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(10)Sr2Ga2 tetrahedra,  a cornercorner with one O(14)Sr2Ga2 tetrahedra,  an edgeedge with one O(7)Sr2Nd2Cu2 octahedra, edges with two equivalent O(6)Sr2Nd2Cu2 octahedra, and faces with two equivalent O(5)Sr2Nd2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-69°. In the third O site, O(3) is bonded to one Sr(1), one Sr(3), one Nd(1), one Nd(2), one Cu(1), and one Cu(3) atom to form distorted OSr2Nd2Cu2 octahedra that share corners with two equivalent O(2)Sr2Nd2Cu2 octahedra, corners with two equivalent O(5)Sr2Nd2Cu2 octahedra, corners with two equivalent O(7)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(10)Sr2Ga2 tetrahedra,  a cornercorner with one O(14)Sr2Ga2 tetrahedra,  an edgeedge with one O(6)Sr2Nd2Cu2 octahedra, edges with two equivalent O(7)Sr2Nd2Cu2 octahedra, faces with two equivalent O(1)Sr2Nd2Cu2 octahedra, and faces with two equivalent O(4)Sr2Nd2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-69°. In the fourth O site, O(4) is bonded to one Sr(1), one Sr(3), one Nd(1), one Nd(2), one Cu(1), and one Cu(3) atom to form distorted OSr2Nd2Cu2 octahedra that share corners with two equivalent O(1)Sr2Nd2Cu2 octahedra, corners with two equivalent O(2)Sr2Nd2Cu2 octahedra, corners with two equivalent O(6)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(10)Sr2Ga2 tetrahedra,  a cornercorner with one O(14)Sr2Ga2 tetrahedra,  an edgeedge with one O(5)Sr2Nd2Cu2 octahedra, edges with two equivalent O(1)Sr2Nd2Cu2 octahedra, faces with two equivalent O(3)Sr2Nd2Cu2 octahedra, and faces with two equivalent O(7)Sr2Nd2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 11-69°. In the fifth O site, O(5) is bonded to one Sr(2), one Sr(4), one Nd(1), one Nd(2), one Cu(2), and one Cu(4) atom to form distorted OSr2Nd2Cu2 octahedra that share corners with two equivalent O(1)Sr2Nd2Cu2 octahedra, corners with two equivalent O(3)Sr2Nd2Cu2 octahedra, corners with two equivalent O(7)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(10)Sr2Ga2 tetrahedra,  a cornercorner with one O(14)Sr2Ga2 tetrahedra,  an edgeedge with one O(4)Sr2Nd2Cu2 octahedra, faces with two equivalent O(2)Sr2Nd2Cu2 octahedra, and faces with two equivalent O(6)Sr2Nd2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-69°. In the sixth O site, O(6) is bonded to one Sr(2), one Sr(4), one Nd(1), one Nd(2), one Cu(2), and one Cu(4) atom to form distorted OSr2Nd2Cu2 octahedra that share corners with two equivalent O(1)Sr2Nd2Cu2 octahedra, corners with two equivalent O(2)Sr2Nd2Cu2 octahedra, corners with two equivalent O(4)Sr2Nd2Cu2 octahedra, corners with two equivalent O(7)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(10)Sr2Ga2 tetrahedra,  a cornercorner with one O(14)Sr2Ga2 tetrahedra,  an edgeedge with one O(3)Sr2Nd2Cu2 octahedra, edges with two equivalent O(2)Sr2Nd2Cu2 octahedra, and faces with two equivalent O(5)Sr2Nd2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-70°. In the seventh O site, O(7) is bonded to one Sr(1), one Sr(3), one Nd(1), one Nd(2), one Cu(1), and one Cu(3) atom to form distorted OSr2Nd2Cu2 octahedra that share corners with two equivalent O(3)Sr2Nd2Cu2 octahedra, corners with two equivalent O(5)Sr2Nd2Cu2 octahedra, corners with two equivalent O(6)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(10)Sr2Ga2 tetrahedra,  a cornercorner with one O(14)Sr2Ga2 tetrahedra,  an edgeedge with one O(2)Sr2Nd2Cu2 octahedra, edges with two equivalent O(3)Sr2Nd2Cu2 octahedra, faces with two equivalent O(1)Sr2Nd2Cu2 octahedra, and faces with two equivalent O(4)Sr2Nd2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-69°. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(1), two equivalent Sr(3), one Cu(1), and one Ga(1) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to two equivalent Sr(2), two equivalent Sr(4), one Cu(4), and one Ga(1) atom. In the tenth O site, O(10) is bonded to one Sr(1), one Sr(2), one Ga(1), and one Ga(2) atom to form distorted OSr2Ga2 tetrahedra that share  a cornercorner with one O(1)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(2)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(3)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(4)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(5)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(6)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(7)Sr2Nd2Cu2 octahedra, and corners with two equivalent O(14)Sr2Ga2 tetrahedra. The corner-sharing octahedral tilt angles range from 15-73°. In the eleventh O site, O(11) is bonded in a 6-coordinate geometry to one Sr(2), one Sr(4), one Nd(1), one Nd(2), one Cu(2), and one Cu(4) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to two equivalent Sr(1), two equivalent Sr(3), one Cu(3), and one Ga(2) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one Sr(4), two equivalent Sr(2), one Cu(2), and one Ga(2) atom. In the fourteenth O site, O(14) is bonded to one Sr(3), one Sr(4), one Ga(1), and one Ga(2) atom to form distorted OSr2Ga2 tetrahedra that share  a cornercorner with one O(1)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(2)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(3)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(4)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(5)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(6)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(7)Sr2Nd2Cu2 octahedra, and corners with two equivalent O(10)Sr2Ga2 tetrahedra. The corner-sharing octahedral tilt angles range from 18-73°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2NdGaCu2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.484
_cell_length_b   5.608
_cell_length_c   12.223
_cell_angle_alpha   103.100
_cell_angle_beta   102.941
_cell_angle_gamma   90.053
_symmetry_Int_Tables_number   1
_cell_volume   356.284
_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  0.152  0.176  0.305  1.0
  Sr  Sr1  1  0.332  0.370  0.693  1.0
  Sr  Sr2  1  0.651  0.637  0.306  1.0
  Sr  Sr3  1  0.837  0.830  0.694  1.0
  Nd  Nd4  1  0.497  0.495  0.000  1.0
  Nd  Nd5  1  0.998  0.996  0.001  1.0
  Ga  Ga6  1  0.219  0.824  0.501  1.0
  Ga  Ga7  1  0.717  0.184  0.496  1.0
  Cu  Cu8  1  0.077  0.576  0.150  1.0
  Cu  Cu9  1  0.921  0.419  0.853  1.0
  Cu  Cu10  1  0.581  0.077  0.157  1.0
  Cu  Cu11  1  0.417  0.919  0.846  1.0
  O  O12  1  0.814  0.324  0.132  1.0
  O  O13  1  0.675  0.670  0.868  1.0
  O  O14  1  0.307  0.308  0.131  1.0
  O  O15  1  0.325  0.811  0.137  1.0
  O  O16  1  0.173  0.683  0.871  1.0
  O  O17  1  0.182  0.184  0.864  1.0
  O  O18  1  0.826  0.819  0.137  1.0
  O  O19  1  0.217  0.626  0.359  1.0
  O  O20  1  0.355  0.779  0.648  1.0
  O  O21  1  0.376  0.128  0.500  1.0
  O  O22  1  0.686  0.173  0.867  1.0
  O  O23  1  0.704  0.225  0.349  1.0
  O  O24  1  0.863  0.388  0.635  1.0
  O  O25  1  0.873  0.881  0.500  1.0
[/CIF]
.
The material described by GaSr2NdCu2O7 crystallizes in the triclinic P1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(3), one O(4), one O(7), one O(8), and two equivalent O(12) atoms. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(10), one O(11), one O(2), one O(5), one O(6), two equivalent O(13), and two equivalent O(9) atoms. In the third Sr site, Sr(3) is bonded in a 9-coordinate geometry to one O(1), one O(14), one O(3), one O(4), one O(7), two equivalent O(12), and two equivalent O(8) atoms. In the fourth Sr site, Sr(4) is bonded in a 8-coordinate geometry to one O(11), one O(13), one O(14), one O(2), one O(5), one O(6), and two equivalent O(9) atoms. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a body-centered cubic geometry to one O(1), one O(11), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom. In the second Nd site, Nd(2) is bonded in a body-centered cubic geometry to one O(1), one O(11), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one O(1), one O(3), one O(4), one O(7), and one O(8) atom to form distorted CuO5 square pyramids that share corners with four equivalent Cu(3)O5 square pyramids and  a cornercorner with one Ga(1)O4 tetrahedra. In the second Cu site, Cu(2) is bonded to one O(11), one O(13), one O(2), one O(5), and one O(6) atom to form distorted CuO5 square pyramids that share corners with four equivalent Cu(4)O5 square pyramids and  a cornercorner with one Ga(2)O4 tetrahedra. In the third Cu site, Cu(3) is bonded to one O(1), one O(12), one O(3), one O(4), and one O(7) atom to form CuO5 square pyramids that share corners with four equivalent Cu(1)O5 square pyramids and  a cornercorner with one Ga(2)O4 tetrahedra. In the fourth Cu site, Cu(4) is bonded to one O(11), one O(2), one O(5), one O(6), and one O(9) atom to form CuO5 square pyramids that share corners with four equivalent Cu(2)O5 square pyramids and  a cornercorner with one Ga(1)O4 tetrahedra. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(10), one O(14), one O(8), and one O(9) atom to form GaO4 tetrahedra that share  a cornercorner with one Cu(1)O5 square pyramid,  a cornercorner with one Cu(4)O5 square pyramid, and corners with two equivalent Ga(2)O4 tetrahedra. In the second Ga site, Ga(2) is bonded to one O(10), one O(12), one O(13), and one O(14) atom to form GaO4 tetrahedra that share  a cornercorner with one Cu(2)O5 square pyramid,  a cornercorner with one Cu(3)O5 square pyramid, and corners with two equivalent Ga(1)O4 tetrahedra. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded to one Sr(1), one Sr(3), one Nd(1), one Nd(2), one Cu(1), and one Cu(3) atom to form distorted OSr2Nd2Cu2 octahedra that share corners with two equivalent O(2)Sr2Nd2Cu2 octahedra, corners with two equivalent O(4)Sr2Nd2Cu2 octahedra, corners with two equivalent O(5)Sr2Nd2Cu2 octahedra, corners with two equivalent O(6)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(10)Sr2Ga2 tetrahedra,  a cornercorner with one O(14)Sr2Ga2 tetrahedra, edges with two equivalent O(4)Sr2Nd2Cu2 octahedra, faces with two equivalent O(3)Sr2Nd2Cu2 octahedra, and faces with two equivalent O(7)Sr2Nd2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-70°. In the second O site, O(2) is bonded to one Sr(2), one Sr(4), one Nd(1), one Nd(2), one Cu(2), and one Cu(4) atom to form distorted OSr2Nd2Cu2 octahedra that share corners with two equivalent O(1)Sr2Nd2Cu2 octahedra, corners with two equivalent O(3)Sr2Nd2Cu2 octahedra, corners with two equivalent O(4)Sr2Nd2Cu2 octahedra, corners with two equivalent O(6)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(10)Sr2Ga2 tetrahedra,  a cornercorner with one O(14)Sr2Ga2 tetrahedra,  an edgeedge with one O(7)Sr2Nd2Cu2 octahedra, edges with two equivalent O(6)Sr2Nd2Cu2 octahedra, and faces with two equivalent O(5)Sr2Nd2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-69°. In the third O site, O(3) is bonded to one Sr(1), one Sr(3), one Nd(1), one Nd(2), one Cu(1), and one Cu(3) atom to form distorted OSr2Nd2Cu2 octahedra that share corners with two equivalent O(2)Sr2Nd2Cu2 octahedra, corners with two equivalent O(5)Sr2Nd2Cu2 octahedra, corners with two equivalent O(7)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(10)Sr2Ga2 tetrahedra,  a cornercorner with one O(14)Sr2Ga2 tetrahedra,  an edgeedge with one O(6)Sr2Nd2Cu2 octahedra, edges with two equivalent O(7)Sr2Nd2Cu2 octahedra, faces with two equivalent O(1)Sr2Nd2Cu2 octahedra, and faces with two equivalent O(4)Sr2Nd2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-69°. In the fourth O site, O(4) is bonded to one Sr(1), one Sr(3), one Nd(1), one Nd(2), one Cu(1), and one Cu(3) atom to form distorted OSr2Nd2Cu2 octahedra that share corners with two equivalent O(1)Sr2Nd2Cu2 octahedra, corners with two equivalent O(2)Sr2Nd2Cu2 octahedra, corners with two equivalent O(6)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(10)Sr2Ga2 tetrahedra,  a cornercorner with one O(14)Sr2Ga2 tetrahedra,  an edgeedge with one O(5)Sr2Nd2Cu2 octahedra, edges with two equivalent O(1)Sr2Nd2Cu2 octahedra, faces with two equivalent O(3)Sr2Nd2Cu2 octahedra, and faces with two equivalent O(7)Sr2Nd2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 11-69°. In the fifth O site, O(5) is bonded to one Sr(2), one Sr(4), one Nd(1), one Nd(2), one Cu(2), and one Cu(4) atom to form distorted OSr2Nd2Cu2 octahedra that share corners with two equivalent O(1)Sr2Nd2Cu2 octahedra, corners with two equivalent O(3)Sr2Nd2Cu2 octahedra, corners with two equivalent O(7)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(10)Sr2Ga2 tetrahedra,  a cornercorner with one O(14)Sr2Ga2 tetrahedra,  an edgeedge with one O(4)Sr2Nd2Cu2 octahedra, faces with two equivalent O(2)Sr2Nd2Cu2 octahedra, and faces with two equivalent O(6)Sr2Nd2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-69°. In the sixth O site, O(6) is bonded to one Sr(2), one Sr(4), one Nd(1), one Nd(2), one Cu(2), and one Cu(4) atom to form distorted OSr2Nd2Cu2 octahedra that share corners with two equivalent O(1)Sr2Nd2Cu2 octahedra, corners with two equivalent O(2)Sr2Nd2Cu2 octahedra, corners with two equivalent O(4)Sr2Nd2Cu2 octahedra, corners with two equivalent O(7)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(10)Sr2Ga2 tetrahedra,  a cornercorner with one O(14)Sr2Ga2 tetrahedra,  an edgeedge with one O(3)Sr2Nd2Cu2 octahedra, edges with two equivalent O(2)Sr2Nd2Cu2 octahedra, and faces with two equivalent O(5)Sr2Nd2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-70°. In the seventh O site, O(7) is bonded to one Sr(1), one Sr(3), one Nd(1), one Nd(2), one Cu(1), and one Cu(3) atom to form distorted OSr2Nd2Cu2 octahedra that share corners with two equivalent O(3)Sr2Nd2Cu2 octahedra, corners with two equivalent O(5)Sr2Nd2Cu2 octahedra, corners with two equivalent O(6)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(10)Sr2Ga2 tetrahedra,  a cornercorner with one O(14)Sr2Ga2 tetrahedra,  an edgeedge with one O(2)Sr2Nd2Cu2 octahedra, edges with two equivalent O(3)Sr2Nd2Cu2 octahedra, faces with two equivalent O(1)Sr2Nd2Cu2 octahedra, and faces with two equivalent O(4)Sr2Nd2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-69°. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(1), two equivalent Sr(3), one Cu(1), and one Ga(1) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to two equivalent Sr(2), two equivalent Sr(4), one Cu(4), and one Ga(1) atom. In the tenth O site, O(10) is bonded to one Sr(1), one Sr(2), one Ga(1), and one Ga(2) atom to form distorted OSr2Ga2 tetrahedra that share  a cornercorner with one O(1)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(2)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(3)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(4)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(5)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(6)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(7)Sr2Nd2Cu2 octahedra, and corners with two equivalent O(14)Sr2Ga2 tetrahedra. The corner-sharing octahedral tilt angles range from 15-73°. In the eleventh O site, O(11) is bonded in a 6-coordinate geometry to one Sr(2), one Sr(4), one Nd(1), one Nd(2), one Cu(2), and one Cu(4) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to two equivalent Sr(1), two equivalent Sr(3), one Cu(3), and one Ga(2) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one Sr(4), two equivalent Sr(2), one Cu(2), and one Ga(2) atom. In the fourteenth O site, O(14) is bonded to one Sr(3), one Sr(4), one Ga(1), and one Ga(2) atom to form distorted OSr2Ga2 tetrahedra that share  a cornercorner with one O(1)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(2)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(3)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(4)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(5)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(6)Sr2Nd2Cu2 octahedra,  a cornercorner with one O(7)Sr2Nd2Cu2 octahedra, and corners with two equivalent O(10)Sr2Ga2 tetrahedra. The corner-sharing octahedral tilt angles range from 18-73°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2NdGaCu2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.484
_cell_length_b   5.608
_cell_length_c   12.223
_cell_angle_alpha   103.100
_cell_angle_beta   102.941
_cell_angle_gamma   90.053
_symmetry_Int_Tables_number   1
_cell_volume   356.284
_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  0.152  0.176  0.305  1.0
  Sr  Sr1  1  0.332  0.370  0.693  1.0
  Sr  Sr2  1  0.651  0.637  0.306  1.0
  Sr  Sr3  1  0.837  0.830  0.694  1.0
  Nd  Nd4  1  0.497  0.495  0.000  1.0
  Nd  Nd5  1  0.998  0.996  0.001  1.0
  Ga  Ga6  1  0.219  0.824  0.501  1.0
  Ga  Ga7  1  0.717  0.184  0.496  1.0
  Cu  Cu8  1  0.077  0.576  0.150  1.0
  Cu  Cu9  1  0.921  0.419  0.853  1.0
  Cu  Cu10  1  0.581  0.077  0.157  1.0
  Cu  Cu11  1  0.417  0.919  0.846  1.0
  O  O12  1  0.814  0.324  0.132  1.0
  O  O13  1  0.675  0.670  0.868  1.0
  O  O14  1  0.307  0.308  0.131  1.0
  O  O15  1  0.325  0.811  0.137  1.0
  O  O16  1  0.173  0.683  0.871  1.0
  O  O17  1  0.182  0.184  0.864  1.0
  O  O18  1  0.826  0.819  0.137  1.0
  O  O19  1  0.217  0.626  0.359  1.0
  O  O20  1  0.355  0.779  0.648  1.0
  O  O21  1  0.376  0.128  0.500  1.0
  O  O22  1  0.686  0.173  0.867  1.0
  O  O23  1  0.704  0.225  0.349  1.0
  O  O24  1  0.863  0.388  0.635  1.0
  O  O25  1  0.873  0.881  0.500  1.0
[/CIF]
.