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 7-coordinate geometry to one O(2), one O(4), one O(5), one O(8), one O(9), and two equivalent O(10) atoms. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to one O(1), one O(12), one O(13), one O(14), one O(2), one O(3), and two equivalent O(11) atoms. 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 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 and  a cornercorner with one Ga(1)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 and  a cornercorner with one Ga(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. 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(3), and one O(6) atom. In the second Al site, Al(2) is bonded in a 3-coordinate geometry to one O(5), one O(8), and one O(9) atom. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Sr(3), one W(2), one W(4), and one Al(1) atom. 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(9)Sr2AlW2 square pyramid, corners with two equivalent O(7)Sr2Ga2 tetrahedra, and  a cornercorner with one O(13)Sr2W2 trigonal pyramid. In the third O site, O(3) is bonded in a 1-coordinate geometry to one Sr(1), one Sr(3), one W(2), one W(4), and one Al(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(4), one W(3), and one Ga(2) atom. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to one Sr(2), one W(1), one W(3), and one Al(2) atom. In the sixth O site, O(6) 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 corners with three equivalent O(9)Sr2AlW2 square pyramids and  a cornercorner with one O(7)Sr2Ga2 tetrahedra. 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  a cornercorner with one O(9)Sr2AlW2 square pyramid, corners with two equivalent O(2)Sr2Ga2 tetrahedra,  a cornercorner with one O(13)Sr2W2 trigonal pyramid, and  a cornercorner with one O(6)SrAlW2 trigonal pyramid. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to one Sr(2), one W(1), one W(3), and one Al(2) atom. In the ninth O site, O(9) is bonded to one Sr(2), one Sr(4), one W(1), one W(3), and one Al(2) atom to form distorted OSr2AlW2 square pyramids that share  a cornercorner with one O(2)Sr2Ga2 tetrahedra,  a cornercorner with one O(7)Sr2Ga2 tetrahedra, and corners with three equivalent O(6)SrAlW2 trigonal pyramids. 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 in a 5-coordinate geometry to one Sr(1), two equivalent Sr(3), one W(2), and one Ga(1) atom. 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 Sr(3), one W(2), and one W(4) atom to form distorted corner-sharing OSr2W2 trigonal pyramids. 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 card [CIF]
data_Sr2AlGaW2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.686
_cell_length_b   6.137
_cell_length_c   11.801
_cell_angle_alpha   104.695
_cell_angle_beta   103.837
_cell_angle_gamma   88.743
_symmetry_Int_Tables_number   1
_cell_volume   386.506
_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  0.880  0.814  0.697  1.0
  Sr  Sr1  1  0.148  0.217  0.330  1.0
  Sr  Sr2  1  0.348  0.363  0.692  1.0
  Sr  Sr3  1  0.654  0.615  0.317  1.0
  Al  Al4  1  0.382  0.599  0.976  1.0
  Al  Al5  1  0.953  0.123  0.053  1.0
  Ga  Ga6  1  0.721  0.168  0.507  1.0
  Ga  Ga7  1  0.229  0.829  0.505  1.0
  W  W8  1  0.583  0.070  0.146  1.0
  W  W9  1  0.923  0.389  0.858  1.0
  W  W10  1  0.093  0.585  0.143  1.0
  W  W11  1  0.452  0.931  0.852  1.0
  O  O12  1  0.609  0.598  0.892  1.0
  O  O13  1  0.392  0.092  0.502  1.0
  O  O14  1  0.155  0.708  0.872  1.0
  O  O15  1  0.217  0.632  0.354  1.0
  O  O16  1  0.940  0.919  0.148  1.0
  O  O17  1  0.431  0.740  0.133  1.0
  O  O18  1  0.892  0.896  0.497  1.0
  O  O19  1  0.254  0.250  0.142  1.0
  O  O20  1  0.817  0.359  0.158  1.0
  O  O21  1  0.691  0.228  0.355  1.0
  O  O22  1  0.841  0.391  0.645  1.0
  O  O23  1  0.339  0.740  0.646  1.0
  O  O24  1  0.666  0.124  0.789  1.0
  O  O25  1  0.181  0.156  0.804  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 7-coordinate geometry to one O(2), one O(4), one O(5), one O(8), one O(9), and two equivalent O(10) atoms. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to one O(1), one O(12), one O(13), one O(14), one O(2), one O(3), and two equivalent O(11) atoms. 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 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 and  a cornercorner with one Ga(1)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 and  a cornercorner with one Ga(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. 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(3), and one O(6) atom. In the second Al site, Al(2) is bonded in a 3-coordinate geometry to one O(5), one O(8), and one O(9) atom. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Sr(3), one W(2), one W(4), and one Al(1) atom. 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(9)Sr2AlW2 square pyramid, corners with two equivalent O(7)Sr2Ga2 tetrahedra, and  a cornercorner with one O(13)Sr2W2 trigonal pyramid. In the third O site, O(3) is bonded in a 1-coordinate geometry to one Sr(1), one Sr(3), one W(2), one W(4), and one Al(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(4), one W(3), and one Ga(2) atom. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to one Sr(2), one W(1), one W(3), and one Al(2) atom. In the sixth O site, O(6) 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 corners with three equivalent O(9)Sr2AlW2 square pyramids and  a cornercorner with one O(7)Sr2Ga2 tetrahedra. 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  a cornercorner with one O(9)Sr2AlW2 square pyramid, corners with two equivalent O(2)Sr2Ga2 tetrahedra,  a cornercorner with one O(13)Sr2W2 trigonal pyramid, and  a cornercorner with one O(6)SrAlW2 trigonal pyramid. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to one Sr(2), one W(1), one W(3), and one Al(2) atom. In the ninth O site, O(9) is bonded to one Sr(2), one Sr(4), one W(1), one W(3), and one Al(2) atom to form distorted OSr2AlW2 square pyramids that share  a cornercorner with one O(2)Sr2Ga2 tetrahedra,  a cornercorner with one O(7)Sr2Ga2 tetrahedra, and corners with three equivalent O(6)SrAlW2 trigonal pyramids. 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 in a 5-coordinate geometry to one Sr(1), two equivalent Sr(3), one W(2), and one Ga(1) atom. 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 Sr(3), one W(2), and one W(4) atom to form distorted corner-sharing OSr2W2 trigonal pyramids. 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 card [CIF]
data_Sr2AlGaW2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.686
_cell_length_b   6.137
_cell_length_c   11.801
_cell_angle_alpha   104.695
_cell_angle_beta   103.837
_cell_angle_gamma   88.743
_symmetry_Int_Tables_number   1
_cell_volume   386.506
_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  0.880  0.814  0.697  1.0
  Sr  Sr1  1  0.148  0.217  0.330  1.0
  Sr  Sr2  1  0.348  0.363  0.692  1.0
  Sr  Sr3  1  0.654  0.615  0.317  1.0
  Al  Al4  1  0.382  0.599  0.976  1.0
  Al  Al5  1  0.953  0.123  0.053  1.0
  Ga  Ga6  1  0.721  0.168  0.507  1.0
  Ga  Ga7  1  0.229  0.829  0.505  1.0
  W  W8  1  0.583  0.070  0.146  1.0
  W  W9  1  0.923  0.389  0.858  1.0
  W  W10  1  0.093  0.585  0.143  1.0
  W  W11  1  0.452  0.931  0.852  1.0
  O  O12  1  0.609  0.598  0.892  1.0
  O  O13  1  0.392  0.092  0.502  1.0
  O  O14  1  0.155  0.708  0.872  1.0
  O  O15  1  0.217  0.632  0.354  1.0
  O  O16  1  0.940  0.919  0.148  1.0
  O  O17  1  0.431  0.740  0.133  1.0
  O  O18  1  0.892  0.896  0.497  1.0
  O  O19  1  0.254  0.250  0.142  1.0
  O  O20  1  0.817  0.359  0.158  1.0
  O  O21  1  0.691  0.228  0.355  1.0
  O  O22  1  0.841  0.391  0.645  1.0
  O  O23  1  0.339  0.740  0.646  1.0
  O  O24  1  0.666  0.124  0.789  1.0
  O  O25  1  0.181  0.156  0.804  1.0
[/CIF]
.