The material described by Sr2YGaSn2O7 crystallizes in the triclinic P1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 3-coordinate geometry to one O(11), one O(12), one O(13), and one O(7) atom. In the second Sr site, Sr(2) is bonded in a 6-coordinate geometry to one O(2), one O(4), one O(5), one O(8), and two equivalent O(10) atoms. In the third Sr site, Sr(3) is bonded in a distorted trigonal non-coplanar geometry to one O(11), one O(12), and one O(2) atom. In the fourth Sr site, Sr(4) is bonded in a 5-coordinate geometry to one O(10), one O(4), one O(6), one O(7), and one O(9) atom. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 6-coordinate geometry to one O(1), one O(13), one O(14), one O(3), one O(6), and one O(9) atom. In the second Y site, Y(2) is bonded in a 5-coordinate geometry to one O(1), one O(13), one O(3), one O(5), and one O(8) atom. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(10), one O(11), one O(2), and one O(7) atom to form GaO4 tetrahedra that share  a cornercorner with one Sn(1)O5 square pyramid. In the second Ga site, Ga(2) is bonded in a distorted trigonal non-coplanar geometry to one O(2), one O(4), and one O(7) atom. There are four inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(10), one O(5), one O(6), one O(8), and one O(9) atom to form SnO5 square pyramids that share corners with four equivalent Sn(3)O5 square pyramids and  a cornercorner with one Ga(1)O4 tetrahedra. In the second Sn site, Sn(2) is bonded in a 4-coordinate geometry to one O(1), one O(13), one O(14), and one O(3) atom. In the third Sn site, Sn(3) is bonded to one O(4), one O(5), one O(6), one O(8), and one O(9) atom to form corner-sharing SnO5 square pyramids. In the fourth Sn site, Sn(4) is bonded in a square pyramidal geometry to one O(1), one O(12), one O(13), one O(14), and one O(3) atom. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded to one Y(1), one Y(2), one Sn(2), and one Sn(4) atom to form distorted corner-sharing OY2Sn2 trigonal pyramids. In the second O site, O(2) is bonded to one Sr(2), one Sr(3), one Ga(1), and one Ga(2) atom to form distorted OSr2Ga2 tetrahedra that share  a cornercorner with one O(5)SrYSn2 tetrahedra,  a cornercorner with one O(10)Sr3GaSn trigonal bipyramid, corners with two equivalent O(7)Sr2Ga2 trigonal pyramids, and  an edgeedge with one O(10)Sr3GaSn trigonal bipyramid. In the third O site, O(3) is bonded in a distorted see-saw-like geometry to one Y(1), one Y(2), one Sn(2), and one Sn(4) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(4), one Ga(2), and one Sn(3) atom. In the fifth O site, O(5) is bonded to one Sr(2), one Y(2), one Sn(1), and one Sn(3) atom to form OSrYSn2 tetrahedra that share  a cornercorner with one O(2)Sr2Ga2 tetrahedra, corners with two equivalent O(6)SrYSn2 tetrahedra,  a cornercorner with one O(10)Sr3GaSn trigonal bipyramid,  a cornercorner with one O(1)Y2Sn2 trigonal pyramid, and  an edgeedge with one O(10)Sr3GaSn trigonal bipyramid. In the sixth O site, O(6) is bonded to one Sr(4), one Y(1), one Sn(1), and one Sn(3) atom to form distorted OSrYSn2 tetrahedra that share corners with two equivalent O(5)SrYSn2 tetrahedra, corners with two equivalent O(10)Sr3GaSn trigonal bipyramids,  a cornercorner with one O(7)Sr2Ga2 trigonal pyramid, and  a cornercorner with one O(1)Y2Sn2 trigonal pyramid. In the seventh O site, O(7) is bonded to one Sr(1), one Sr(4), one Ga(1), and one Ga(2) atom to form distorted OSr2Ga2 trigonal pyramids that share  a cornercorner with one O(6)SrYSn2 tetrahedra, corners with two equivalent O(2)Sr2Ga2 tetrahedra, and corners with two equivalent O(10)Sr3GaSn trigonal bipyramids. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(2), one Y(2), one Sn(1), and one Sn(3) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Sr(4), one Y(1), one Sn(1), and one Sn(3) atom. In the tenth O site, O(10) is bonded to one Sr(4), two equivalent Sr(2), one Ga(1), and one Sn(1) atom to form distorted OSr3GaSn trigonal bipyramids that share  a cornercorner with one O(2)Sr2Ga2 tetrahedra,  a cornercorner with one O(5)SrYSn2 tetrahedra, corners with two equivalent O(6)SrYSn2 tetrahedra, corners with two equivalent O(10)Sr3GaSn trigonal bipyramids, corners with two equivalent O(7)Sr2Ga2 trigonal pyramids,  an edgeedge with one O(2)Sr2Ga2 tetrahedra, and  an edgeedge with one O(5)SrYSn2 tetrahedra. In the eleventh O site, O(11) is bonded in a distorted trigonal non-coplanar geometry to one Sr(1), one Sr(3), and one Ga(1) atom. In the twelfth O site, O(12) is bonded in a trigonal non-coplanar geometry to one Sr(1), one Sr(3), and one Sn(4) atom. In the thirteenth O site, O(13) is bonded in a 5-coordinate geometry to one Sr(1), one Y(1), one Y(2), one Sn(2), and one Sn(4) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to one Y(1), one Sn(2), and one Sn(4) atom. is represented by the CIF file [CIF]
data_Sr2YGaSn2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.889
_cell_length_b   6.113
_cell_length_c   12.795
_cell_angle_alpha   105.104
_cell_angle_beta   103.396
_cell_angle_gamma   91.855
_symmetry_Int_Tables_number   1
_cell_volume   430.517
_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  0.113  0.180  0.346  1.0
  Sr  Sr1  1  0.841  0.800  0.682  1.0
  Sr  Sr2  1  0.614  0.612  0.351  1.0
  Sr  Sr3  1  0.353  0.373  0.677  1.0
  Y  Y4  1  0.474  0.524  0.998  1.0
  Y  Y5  1  0.980  0.023  0.996  1.0
  Ga  Ga6  1  0.237  0.813  0.523  1.0
  Ga  Ga7  1  0.749  0.204  0.518  1.0
  Sn  Sn8  1  0.423  0.939  0.847  1.0
  Sn  Sn9  1  0.061  0.609  0.175  1.0
  Sn  Sn10  1  0.919  0.430  0.857  1.0
  Sn  Sn11  1  0.550  0.078  0.116  1.0
  O  O12  1  0.775  0.359  0.074  1.0
  O  O13  1  0.918  0.874  0.506  1.0
  O  O14  1  0.258  0.303  0.106  1.0
  O  O15  1  0.808  0.377  0.684  1.0
  O  O16  1  0.744  0.076  0.839  1.0
  O  O17  1  0.280  0.243  0.840  1.0
  O  O18  1  0.408  0.064  0.505  1.0
  O  O19  1  0.117  0.786  0.861  1.0
  O  O20  1  0.591  0.640  0.862  1.0
  O  O21  1  0.329  0.787  0.673  1.0
  O  O22  1  0.318  0.544  0.444  1.0
  O  O23  1  0.687  0.220  0.279  1.0
  O  O24  1  0.849  0.849  0.107  1.0
  O  O25  1  0.338  0.778  0.124  1.0
[/CIF]
.
The material described by Sr2YGaSn2O7 crystallizes in the triclinic P1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 3-coordinate geometry to one O(11), one O(12), one O(13), and one O(7) atom. In the second Sr site, Sr(2) is bonded in a 6-coordinate geometry to one O(2), one O(4), one O(5), one O(8), and two equivalent O(10) atoms. In the third Sr site, Sr(3) is bonded in a distorted trigonal non-coplanar geometry to one O(11), one O(12), and one O(2) atom. In the fourth Sr site, Sr(4) is bonded in a 5-coordinate geometry to one O(10), one O(4), one O(6), one O(7), and one O(9) atom. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 6-coordinate geometry to one O(1), one O(13), one O(14), one O(3), one O(6), and one O(9) atom. In the second Y site, Y(2) is bonded in a 5-coordinate geometry to one O(1), one O(13), one O(3), one O(5), and one O(8) atom. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(10), one O(11), one O(2), and one O(7) atom to form GaO4 tetrahedra that share  a cornercorner with one Sn(1)O5 square pyramid. In the second Ga site, Ga(2) is bonded in a distorted trigonal non-coplanar geometry to one O(2), one O(4), and one O(7) atom. There are four inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(10), one O(5), one O(6), one O(8), and one O(9) atom to form SnO5 square pyramids that share corners with four equivalent Sn(3)O5 square pyramids and  a cornercorner with one Ga(1)O4 tetrahedra. In the second Sn site, Sn(2) is bonded in a 4-coordinate geometry to one O(1), one O(13), one O(14), and one O(3) atom. In the third Sn site, Sn(3) is bonded to one O(4), one O(5), one O(6), one O(8), and one O(9) atom to form corner-sharing SnO5 square pyramids. In the fourth Sn site, Sn(4) is bonded in a square pyramidal geometry to one O(1), one O(12), one O(13), one O(14), and one O(3) atom. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded to one Y(1), one Y(2), one Sn(2), and one Sn(4) atom to form distorted corner-sharing OY2Sn2 trigonal pyramids. In the second O site, O(2) is bonded to one Sr(2), one Sr(3), one Ga(1), and one Ga(2) atom to form distorted OSr2Ga2 tetrahedra that share  a cornercorner with one O(5)SrYSn2 tetrahedra,  a cornercorner with one O(10)Sr3GaSn trigonal bipyramid, corners with two equivalent O(7)Sr2Ga2 trigonal pyramids, and  an edgeedge with one O(10)Sr3GaSn trigonal bipyramid. In the third O site, O(3) is bonded in a distorted see-saw-like geometry to one Y(1), one Y(2), one Sn(2), and one Sn(4) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(4), one Ga(2), and one Sn(3) atom. In the fifth O site, O(5) is bonded to one Sr(2), one Y(2), one Sn(1), and one Sn(3) atom to form OSrYSn2 tetrahedra that share  a cornercorner with one O(2)Sr2Ga2 tetrahedra, corners with two equivalent O(6)SrYSn2 tetrahedra,  a cornercorner with one O(10)Sr3GaSn trigonal bipyramid,  a cornercorner with one O(1)Y2Sn2 trigonal pyramid, and  an edgeedge with one O(10)Sr3GaSn trigonal bipyramid. In the sixth O site, O(6) is bonded to one Sr(4), one Y(1), one Sn(1), and one Sn(3) atom to form distorted OSrYSn2 tetrahedra that share corners with two equivalent O(5)SrYSn2 tetrahedra, corners with two equivalent O(10)Sr3GaSn trigonal bipyramids,  a cornercorner with one O(7)Sr2Ga2 trigonal pyramid, and  a cornercorner with one O(1)Y2Sn2 trigonal pyramid. In the seventh O site, O(7) is bonded to one Sr(1), one Sr(4), one Ga(1), and one Ga(2) atom to form distorted OSr2Ga2 trigonal pyramids that share  a cornercorner with one O(6)SrYSn2 tetrahedra, corners with two equivalent O(2)Sr2Ga2 tetrahedra, and corners with two equivalent O(10)Sr3GaSn trigonal bipyramids. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(2), one Y(2), one Sn(1), and one Sn(3) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Sr(4), one Y(1), one Sn(1), and one Sn(3) atom. In the tenth O site, O(10) is bonded to one Sr(4), two equivalent Sr(2), one Ga(1), and one Sn(1) atom to form distorted OSr3GaSn trigonal bipyramids that share  a cornercorner with one O(2)Sr2Ga2 tetrahedra,  a cornercorner with one O(5)SrYSn2 tetrahedra, corners with two equivalent O(6)SrYSn2 tetrahedra, corners with two equivalent O(10)Sr3GaSn trigonal bipyramids, corners with two equivalent O(7)Sr2Ga2 trigonal pyramids,  an edgeedge with one O(2)Sr2Ga2 tetrahedra, and  an edgeedge with one O(5)SrYSn2 tetrahedra. In the eleventh O site, O(11) is bonded in a distorted trigonal non-coplanar geometry to one Sr(1), one Sr(3), and one Ga(1) atom. In the twelfth O site, O(12) is bonded in a trigonal non-coplanar geometry to one Sr(1), one Sr(3), and one Sn(4) atom. In the thirteenth O site, O(13) is bonded in a 5-coordinate geometry to one Sr(1), one Y(1), one Y(2), one Sn(2), and one Sn(4) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to one Y(1), one Sn(2), and one Sn(4) atom. is represented by the CIF file [CIF]
data_Sr2YGaSn2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.889
_cell_length_b   6.113
_cell_length_c   12.795
_cell_angle_alpha   105.104
_cell_angle_beta   103.396
_cell_angle_gamma   91.855
_symmetry_Int_Tables_number   1
_cell_volume   430.517
_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  0.113  0.180  0.346  1.0
  Sr  Sr1  1  0.841  0.800  0.682  1.0
  Sr  Sr2  1  0.614  0.612  0.351  1.0
  Sr  Sr3  1  0.353  0.373  0.677  1.0
  Y  Y4  1  0.474  0.524  0.998  1.0
  Y  Y5  1  0.980  0.023  0.996  1.0
  Ga  Ga6  1  0.237  0.813  0.523  1.0
  Ga  Ga7  1  0.749  0.204  0.518  1.0
  Sn  Sn8  1  0.423  0.939  0.847  1.0
  Sn  Sn9  1  0.061  0.609  0.175  1.0
  Sn  Sn10  1  0.919  0.430  0.857  1.0
  Sn  Sn11  1  0.550  0.078  0.116  1.0
  O  O12  1  0.775  0.359  0.074  1.0
  O  O13  1  0.918  0.874  0.506  1.0
  O  O14  1  0.258  0.303  0.106  1.0
  O  O15  1  0.808  0.377  0.684  1.0
  O  O16  1  0.744  0.076  0.839  1.0
  O  O17  1  0.280  0.243  0.840  1.0
  O  O18  1  0.408  0.064  0.505  1.0
  O  O19  1  0.117  0.786  0.861  1.0
  O  O20  1  0.591  0.640  0.862  1.0
  O  O21  1  0.329  0.787  0.673  1.0
  O  O22  1  0.318  0.544  0.444  1.0
  O  O23  1  0.687  0.220  0.279  1.0
  O  O24  1  0.849  0.849  0.107  1.0
  O  O25  1  0.338  0.778  0.124  1.0
[/CIF]
.