The material structure described by Sr2W2GaAlO7 crystallizes in the triclinic P1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(11), one O(13), one O(14), one O(3), one O(7), and two equivalent O(12) atoms. 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 6-coordinate geometry to one O(1), one O(12), one O(14), one O(2), and two equivalent O(11) atoms. In the fourth Sr site, Sr(4) is bonded in a 6-coordinate geometry to one O(10), one O(6), one O(7), one O(9), and two equivalent O(4) atoms. There are four inequivalent W sites. In the first W site, W(1) is bonded to one O(10), one O(5), one O(6), one O(8), and one O(9) atom to form distorted WO5 square pyramids that share corners with four equivalent W(3)O5 square pyramids,  a cornercorner with one Ga(1)O4 tetrahedra, and corners with two equivalent Al(2)O4 tetrahedra. In the second W site, W(2) is bonded in a 5-coordinate geometry to one O(1), one O(11), one O(13), one O(14), and one O(3) atom. In the third W site, W(3) is bonded to one O(4), one O(5), one O(6), one O(8), and one O(9) atom to form distorted WO5 square pyramids that share corners with four equivalent W(1)O5 square pyramids,  a cornercorner with one Ga(2)O4 tetrahedra, and corners with two equivalent Al(2)O4 tetrahedra. In the fourth W site, W(4) is bonded to one O(1), one O(12), one O(13), one O(14), and one O(3) atom to form distorted WO5 square pyramids that share  a cornercorner with one Ga(2)O4 tetrahedra and corners with two equivalent Al(2)O4 tetrahedra. 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 W(1)O5 square pyramid and corners with two equivalent Ga(2)O4 tetrahedra. In the second Ga site, Ga(2) is bonded to one O(12), one O(2), one O(4), and one O(7) atom to form GaO4 tetrahedra that share  a cornercorner with one W(3)O5 square pyramid,  a cornercorner with one W(4)O5 square pyramid, and corners with two equivalent Ga(1)O4 tetrahedra. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(6), and one O(9) atom. In the second Al site, Al(2) is bonded to one O(13), one O(3), one O(5), and one O(8) atom to form distorted AlO4 tetrahedra that share corners with two equivalent W(1)O5 square pyramids, corners with two equivalent W(3)O5 square pyramids, and corners with two equivalent W(4)O5 square pyramids. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded to one Sr(3), one W(2), one W(4), and one Al(1) atom to form distorted OSrAlW2 tetrahedra that share  a cornercorner with one O(2)Sr2Ga2 tetrahedra,  a cornercorner with one O(11)Sr3GaW trigonal bipyramid,  a cornercorner with one O(9)SrAlW2 trigonal pyramid, corners with two equivalent O(13)SrAlW2 trigonal pyramids, and  an edgeedge with one O(11)Sr3GaW trigonal bipyramid. 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 OSr2Ga2 tetrahedra that share  a cornercorner with one O(1)SrAlW2 tetrahedra,  a cornercorner with one O(5)SrAlW2 tetrahedra,  a cornercorner with one O(8)SrAlW2 tetrahedra, corners with two equivalent O(7)Sr2Ga2 tetrahedra,  a cornercorner with one O(11)Sr3GaW trigonal bipyramid, and  an edgeedge with one O(11)Sr3GaW trigonal bipyramid. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Sr(1), one W(2), one W(4), and one Al(2) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Sr(2), two equivalent Sr(4), one W(3), and one Ga(2) atom. In the fifth O site, O(5) is bonded to one Sr(2), one W(1), one W(3), and one Al(2) atom to form distorted OSrAlW2 tetrahedra that share  a cornercorner with one O(2)Sr2Ga2 tetrahedra, corners with two equivalent O(8)SrAlW2 tetrahedra,  a cornercorner with one O(13)SrAlW2 trigonal pyramid, corners with two equivalent O(9)SrAlW2 trigonal pyramids, and  an edgeedge with one O(8)SrAlW2 tetrahedra. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(4), one W(1), one W(3), and one Al(1) atom. 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 OSr2Ga2 tetrahedra that share corners with two equivalent O(2)Sr2Ga2 tetrahedra, corners with two equivalent O(11)Sr3GaW trigonal bipyramids,  a cornercorner with one O(13)SrAlW2 trigonal pyramid, and  a cornercorner with one O(9)SrAlW2 trigonal pyramid. In the eighth O site, O(8) is bonded to one Sr(2), one W(1), one W(3), and one Al(2) atom to form distorted OSrAlW2 tetrahedra that share  a cornercorner with one O(2)Sr2Ga2 tetrahedra, corners with two equivalent O(5)SrAlW2 tetrahedra,  a cornercorner with one O(13)SrAlW2 trigonal pyramid, corners with two equivalent O(9)SrAlW2 trigonal pyramids, and  an edgeedge with one O(5)SrAlW2 tetrahedra. In the ninth O site, O(9) is bonded to one Sr(4), one W(1), one W(3), and one Al(1) atom to form distorted OSrAlW2 trigonal pyramids that share  a cornercorner with one O(7)Sr2Ga2 tetrahedra,  a cornercorner with one O(1)SrAlW2 tetrahedra, corners with two equivalent O(5)SrAlW2 tetrahedra, and corners with two equivalent O(8)SrAlW2 tetrahedra. In the tenth O site, O(10) is bonded in a 5-coordinate geometry to one Sr(4), two equivalent Sr(2), one W(1), and one Ga(1) atom. In the eleventh O site, O(11) is bonded to one Sr(1), two equivalent Sr(3), one W(2), and one Ga(1) atom to form distorted OSr3GaW trigonal bipyramids that share  a cornercorner with one O(2)Sr2Ga2 tetrahedra,  a cornercorner with one O(1)SrAlW2 tetrahedra, corners with two equivalent O(7)Sr2Ga2 tetrahedra, corners with two equivalent O(11)Sr3GaW trigonal bipyramids, corners with two equivalent O(13)SrAlW2 trigonal pyramids,  an edgeedge with one O(2)Sr2Ga2 tetrahedra, and  an edgeedge with one O(1)SrAlW2 tetrahedra. In the twelfth O site, O(12) is bonded in a 5-coordinate geometry to one Sr(3), two equivalent Sr(1), one W(4), and one Ga(2) atom. In the thirteenth O site, O(13) is bonded to one Sr(1), one W(2), one W(4), and one Al(2) atom to form distorted OSrAlW2 trigonal pyramids that share  a cornercorner with one O(7)Sr2Ga2 tetrahedra,  a cornercorner with one O(5)SrAlW2 tetrahedra,  a cornercorner with one O(8)SrAlW2 tetrahedra, corners with two equivalent O(1)SrAlW2 tetrahedra, and corners with two equivalent O(11)Sr3GaW trigonal bipyramids. In the fourteenth O site, O(14) is bonded in a distorted see-saw-like geometry to one Sr(1), one Sr(3), one W(2), and one W(4) atom. is represented by the CIF file [CIF]
data_Sr2AlGaW2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.505
_cell_length_b   6.127
_cell_length_c   11.832
_cell_angle_alpha   105.093
_cell_angle_beta   103.119
_cell_angle_gamma   90.005
_symmetry_Int_Tables_number   1
_cell_volume   374.527
_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  0.154  0.170  0.306  1.0
  Sr  Sr1  1  0.834  0.811  0.687  1.0
  Sr  Sr2  1  0.659  0.623  0.312  1.0
  Sr  Sr3  1  0.330  0.376  0.680  1.0
  Al  Al4  1  0.456  0.454  0.982  1.0
  Al  Al5  1  0.032  0.997  1.000  1.0
  Ga  Ga6  1  0.222  0.819  0.496  1.0
  Ga  Ga7  1  0.722  0.177  0.499  1.0
  W  W8  1  0.443  0.913  0.871  1.0
  W  W9  1  0.085  0.586  0.133  1.0
  W  W10  1  0.942  0.419  0.867  1.0
  W  W11  1  0.565  0.080  0.134  1.0
  O  O12  1  0.701  0.408  0.103  1.0
  O  O13  1  0.890  0.907  0.503  1.0
  O  O14  1  0.211  0.244  0.121  1.0
  O  O15  1  0.839  0.381  0.652  1.0
  O  O16  1  0.801  0.094  0.885  1.0
  O  O17  1  0.279  0.229  0.850  1.0
  O  O18  1  0.388  0.094  0.499  1.0
  O  O19  1  0.092  0.754  0.873  1.0
  O  O20  1  0.594  0.585  0.885  1.0
  O  O21  1  0.355  0.752  0.642  1.0
  O  O22  1  0.175  0.608  0.347  1.0
  O  O23  1  0.714  0.251  0.356  1.0
  O  O24  1  0.902  0.900  0.110  1.0
  O  O25  1  0.396  0.831  0.194  1.0
[/CIF]
.
The material structure described by Sr2W2GaAlO7 crystallizes in the triclinic P1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(11), one O(13), one O(14), one O(3), one O(7), and two equivalent O(12) atoms. 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 6-coordinate geometry to one O(1), one O(12), one O(14), one O(2), and two equivalent O(11) atoms. In the fourth Sr site, Sr(4) is bonded in a 6-coordinate geometry to one O(10), one O(6), one O(7), one O(9), and two equivalent O(4) atoms. There are four inequivalent W sites. In the first W site, W(1) is bonded to one O(10), one O(5), one O(6), one O(8), and one O(9) atom to form distorted WO5 square pyramids that share corners with four equivalent W(3)O5 square pyramids,  a cornercorner with one Ga(1)O4 tetrahedra, and corners with two equivalent Al(2)O4 tetrahedra. In the second W site, W(2) is bonded in a 5-coordinate geometry to one O(1), one O(11), one O(13), one O(14), and one O(3) atom. In the third W site, W(3) is bonded to one O(4), one O(5), one O(6), one O(8), and one O(9) atom to form distorted WO5 square pyramids that share corners with four equivalent W(1)O5 square pyramids,  a cornercorner with one Ga(2)O4 tetrahedra, and corners with two equivalent Al(2)O4 tetrahedra. In the fourth W site, W(4) is bonded to one O(1), one O(12), one O(13), one O(14), and one O(3) atom to form distorted WO5 square pyramids that share  a cornercorner with one Ga(2)O4 tetrahedra and corners with two equivalent Al(2)O4 tetrahedra. 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 W(1)O5 square pyramid and corners with two equivalent Ga(2)O4 tetrahedra. In the second Ga site, Ga(2) is bonded to one O(12), one O(2), one O(4), and one O(7) atom to form GaO4 tetrahedra that share  a cornercorner with one W(3)O5 square pyramid,  a cornercorner with one W(4)O5 square pyramid, and corners with two equivalent Ga(1)O4 tetrahedra. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(6), and one O(9) atom. In the second Al site, Al(2) is bonded to one O(13), one O(3), one O(5), and one O(8) atom to form distorted AlO4 tetrahedra that share corners with two equivalent W(1)O5 square pyramids, corners with two equivalent W(3)O5 square pyramids, and corners with two equivalent W(4)O5 square pyramids. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded to one Sr(3), one W(2), one W(4), and one Al(1) atom to form distorted OSrAlW2 tetrahedra that share  a cornercorner with one O(2)Sr2Ga2 tetrahedra,  a cornercorner with one O(11)Sr3GaW trigonal bipyramid,  a cornercorner with one O(9)SrAlW2 trigonal pyramid, corners with two equivalent O(13)SrAlW2 trigonal pyramids, and  an edgeedge with one O(11)Sr3GaW trigonal bipyramid. 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 OSr2Ga2 tetrahedra that share  a cornercorner with one O(1)SrAlW2 tetrahedra,  a cornercorner with one O(5)SrAlW2 tetrahedra,  a cornercorner with one O(8)SrAlW2 tetrahedra, corners with two equivalent O(7)Sr2Ga2 tetrahedra,  a cornercorner with one O(11)Sr3GaW trigonal bipyramid, and  an edgeedge with one O(11)Sr3GaW trigonal bipyramid. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Sr(1), one W(2), one W(4), and one Al(2) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Sr(2), two equivalent Sr(4), one W(3), and one Ga(2) atom. In the fifth O site, O(5) is bonded to one Sr(2), one W(1), one W(3), and one Al(2) atom to form distorted OSrAlW2 tetrahedra that share  a cornercorner with one O(2)Sr2Ga2 tetrahedra, corners with two equivalent O(8)SrAlW2 tetrahedra,  a cornercorner with one O(13)SrAlW2 trigonal pyramid, corners with two equivalent O(9)SrAlW2 trigonal pyramids, and  an edgeedge with one O(8)SrAlW2 tetrahedra. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(4), one W(1), one W(3), and one Al(1) atom. 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 OSr2Ga2 tetrahedra that share corners with two equivalent O(2)Sr2Ga2 tetrahedra, corners with two equivalent O(11)Sr3GaW trigonal bipyramids,  a cornercorner with one O(13)SrAlW2 trigonal pyramid, and  a cornercorner with one O(9)SrAlW2 trigonal pyramid. In the eighth O site, O(8) is bonded to one Sr(2), one W(1), one W(3), and one Al(2) atom to form distorted OSrAlW2 tetrahedra that share  a cornercorner with one O(2)Sr2Ga2 tetrahedra, corners with two equivalent O(5)SrAlW2 tetrahedra,  a cornercorner with one O(13)SrAlW2 trigonal pyramid, corners with two equivalent O(9)SrAlW2 trigonal pyramids, and  an edgeedge with one O(5)SrAlW2 tetrahedra. In the ninth O site, O(9) is bonded to one Sr(4), one W(1), one W(3), and one Al(1) atom to form distorted OSrAlW2 trigonal pyramids that share  a cornercorner with one O(7)Sr2Ga2 tetrahedra,  a cornercorner with one O(1)SrAlW2 tetrahedra, corners with two equivalent O(5)SrAlW2 tetrahedra, and corners with two equivalent O(8)SrAlW2 tetrahedra. In the tenth O site, O(10) is bonded in a 5-coordinate geometry to one Sr(4), two equivalent Sr(2), one W(1), and one Ga(1) atom. In the eleventh O site, O(11) is bonded to one Sr(1), two equivalent Sr(3), one W(2), and one Ga(1) atom to form distorted OSr3GaW trigonal bipyramids that share  a cornercorner with one O(2)Sr2Ga2 tetrahedra,  a cornercorner with one O(1)SrAlW2 tetrahedra, corners with two equivalent O(7)Sr2Ga2 tetrahedra, corners with two equivalent O(11)Sr3GaW trigonal bipyramids, corners with two equivalent O(13)SrAlW2 trigonal pyramids,  an edgeedge with one O(2)Sr2Ga2 tetrahedra, and  an edgeedge with one O(1)SrAlW2 tetrahedra. In the twelfth O site, O(12) is bonded in a 5-coordinate geometry to one Sr(3), two equivalent Sr(1), one W(4), and one Ga(2) atom. In the thirteenth O site, O(13) is bonded to one Sr(1), one W(2), one W(4), and one Al(2) atom to form distorted OSrAlW2 trigonal pyramids that share  a cornercorner with one O(7)Sr2Ga2 tetrahedra,  a cornercorner with one O(5)SrAlW2 tetrahedra,  a cornercorner with one O(8)SrAlW2 tetrahedra, corners with two equivalent O(1)SrAlW2 tetrahedra, and corners with two equivalent O(11)Sr3GaW trigonal bipyramids. In the fourteenth O site, O(14) is bonded in a distorted see-saw-like geometry to one Sr(1), one Sr(3), one W(2), and one W(4) atom. is represented by the CIF file [CIF]
data_Sr2AlGaW2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.505
_cell_length_b   6.127
_cell_length_c   11.832
_cell_angle_alpha   105.093
_cell_angle_beta   103.119
_cell_angle_gamma   90.005
_symmetry_Int_Tables_number   1
_cell_volume   374.527
_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  0.154  0.170  0.306  1.0
  Sr  Sr1  1  0.834  0.811  0.687  1.0
  Sr  Sr2  1  0.659  0.623  0.312  1.0
  Sr  Sr3  1  0.330  0.376  0.680  1.0
  Al  Al4  1  0.456  0.454  0.982  1.0
  Al  Al5  1  0.032  0.997  1.000  1.0
  Ga  Ga6  1  0.222  0.819  0.496  1.0
  Ga  Ga7  1  0.722  0.177  0.499  1.0
  W  W8  1  0.443  0.913  0.871  1.0
  W  W9  1  0.085  0.586  0.133  1.0
  W  W10  1  0.942  0.419  0.867  1.0
  W  W11  1  0.565  0.080  0.134  1.0
  O  O12  1  0.701  0.408  0.103  1.0
  O  O13  1  0.890  0.907  0.503  1.0
  O  O14  1  0.211  0.244  0.121  1.0
  O  O15  1  0.839  0.381  0.652  1.0
  O  O16  1  0.801  0.094  0.885  1.0
  O  O17  1  0.279  0.229  0.850  1.0
  O  O18  1  0.388  0.094  0.499  1.0
  O  O19  1  0.092  0.754  0.873  1.0
  O  O20  1  0.594  0.585  0.885  1.0
  O  O21  1  0.355  0.752  0.642  1.0
  O  O22  1  0.175  0.608  0.347  1.0
  O  O23  1  0.714  0.251  0.356  1.0
  O  O24  1  0.902  0.900  0.110  1.0
  O  O25  1  0.396  0.831  0.194  1.0
[/CIF]
.