The crystal structure described by BaSrGd4O8 crystallizes in the orthorhombic Pmc2_1 space group. Ba(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(4), two equivalent O(6), and two equivalent O(7) atoms. Sr(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(3), two equivalent O(5), and two equivalent O(8) atoms. There are four inequivalent Gd sites. In the first Gd site, Gd(1) is bonded to one O(5), one O(7), two equivalent O(2), and two equivalent O(6) atoms to form a mixture of corner and edge-sharing GdO6 octahedra. The corner-sharing octahedral tilt angles range from 50-62°. In the second Gd site, Gd(2) is bonded to one O(6), one O(8), two equivalent O(1), and two equivalent O(5) atoms to form a mixture of corner and edge-sharing GdO6 octahedra. The corner-sharing octahedral tilt angles range from 51-62°. In the third Gd site, Gd(3) is bonded to one O(1), one O(3), two equivalent O(4), and two equivalent O(8) atoms to form a mixture of corner and edge-sharing GdO6 octahedra. The corner-sharing octahedral tilt angles range from 51-62°. In the fourth Gd site, Gd(4) is bonded to one O(2), one O(4), two equivalent O(3), and two equivalent O(7) atoms to form a mixture of corner and edge-sharing GdO6 octahedra. The corner-sharing octahedral tilt angles range from 50-62°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to two equivalent Sr(1), one Gd(3), and two equivalent Gd(2) atoms. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Ba(1), one Gd(4), and two equivalent Gd(1) atoms. In the third O site, O(3) is bonded to two equivalent Sr(1), one Gd(3), and two equivalent Gd(4) atoms to form OSr2Gd3 square pyramids that share corners with two equivalent O(5)Sr2Gd3 trigonal bipyramids, edges with two equivalent O(4)Ba2Gd3 square pyramids, edges with two equivalent O(3)Sr2Gd3 square pyramids, and  an edgeedge with one O(5)Sr2Gd3 trigonal bipyramid. In the fourth O site, O(4) is bonded to two equivalent Ba(1), one Gd(4), and two equivalent Gd(3) atoms to form OBa2Gd3 square pyramids that share corners with two equivalent O(6)Ba2Gd3 trigonal bipyramids, edges with two equivalent O(4)Ba2Gd3 square pyramids, edges with two equivalent O(3)Sr2Gd3 square pyramids, and  an edgeedge with one O(6)Ba2Gd3 trigonal bipyramid. In the fifth O site, O(5) is bonded to two equivalent Sr(1), one Gd(1), and two equivalent Gd(2) atoms to form distorted OSr2Gd3 trigonal bipyramids that share corners with two equivalent O(3)Sr2Gd3 square pyramids,  an edgeedge with one O(3)Sr2Gd3 square pyramid, edges with two equivalent O(6)Ba2Gd3 trigonal bipyramids, and edges with two equivalent O(5)Sr2Gd3 trigonal bipyramids. In the sixth O site, O(6) is bonded to two equivalent Ba(1), one Gd(2), and two equivalent Gd(1) atoms to form distorted OBa2Gd3 trigonal bipyramids that share corners with two equivalent O(4)Ba2Gd3 square pyramids,  an edgeedge with one O(4)Ba2Gd3 square pyramid, edges with two equivalent O(6)Ba2Gd3 trigonal bipyramids, and edges with two equivalent O(5)Sr2Gd3 trigonal bipyramids. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to two equivalent Ba(1), one Gd(1), and two equivalent Gd(4) atoms. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to two equivalent Sr(1), one Gd(2), and two equivalent Gd(3) atoms. is represented by the CIF file [CIF]
data_BaSrGd4O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.505
_cell_length_b   10.409
_cell_length_c   12.222
_cell_angle_alpha   90.011
_cell_angle_beta   90.000
_cell_angle_gamma   89.998
_symmetry_Int_Tables_number   1
_cell_volume   445.898
_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
  Ba  Ba0  1  0.750  0.748  0.148  1.0
  Ba  Ba1  1  0.750  0.248  0.352  1.0
  Sr  Sr2  1  0.250  0.254  0.853  1.0
  Sr  Sr3  1  0.250  0.754  0.647  1.0
  Gd  Gd4  1  0.750  0.080  0.110  1.0
  Gd  Gd5  1  0.750  0.580  0.390  1.0
  Gd  Gd6  1  0.250  0.923  0.886  1.0
  Gd  Gd7  1  0.250  0.423  0.614  1.0
  Gd  Gd8  1  0.750  0.074  0.613  1.0
  Gd  Gd9  1  0.750  0.574  0.887  1.0
  Gd  Gd10  1  0.250  0.924  0.391  1.0
  Gd  Gd11  1  0.250  0.424  0.109  1.0
  O  O12  1  0.750  0.286  0.673  1.0
  O  O13  1  0.750  0.786  0.827  1.0
  O  O14  1  0.250  0.713  0.333  1.0
  O  O15  1  0.250  0.213  0.167  1.0
  O  O16  1  0.750  0.374  0.979  1.0
  O  O17  1  0.750  0.874  0.521  1.0
  O  O18  1  0.250  0.620  0.015  1.0
  O  O19  1  0.250  0.119  0.485  1.0
  O  O20  1  0.750  0.075  0.919  1.0
  O  O21  1  0.750  0.575  0.581  1.0
  O  O22  1  0.250  0.933  0.076  1.0
  O  O23  1  0.250  0.433  0.424  1.0
  O  O24  1  0.750  0.990  0.285  1.0
  O  O25  1  0.750  0.490  0.215  1.0
  O  O26  1  0.250  0.005  0.714  1.0
  O  O27  1  0.250  0.505  0.786  1.0
[/CIF]
.
The crystal structure described by BaSrGd4O8 crystallizes in the orthorhombic Pmc2_1 space group. Ba(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(4), two equivalent O(6), and two equivalent O(7) atoms. Sr(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(3), two equivalent O(5), and two equivalent O(8) atoms. There are four inequivalent Gd sites. In the first Gd site, Gd(1) is bonded to one O(5), one O(7), two equivalent O(2), and two equivalent O(6) atoms to form a mixture of corner and edge-sharing GdO6 octahedra. The corner-sharing octahedral tilt angles range from 50-62°. In the second Gd site, Gd(2) is bonded to one O(6), one O(8), two equivalent O(1), and two equivalent O(5) atoms to form a mixture of corner and edge-sharing GdO6 octahedra. The corner-sharing octahedral tilt angles range from 51-62°. In the third Gd site, Gd(3) is bonded to one O(1), one O(3), two equivalent O(4), and two equivalent O(8) atoms to form a mixture of corner and edge-sharing GdO6 octahedra. The corner-sharing octahedral tilt angles range from 51-62°. In the fourth Gd site, Gd(4) is bonded to one O(2), one O(4), two equivalent O(3), and two equivalent O(7) atoms to form a mixture of corner and edge-sharing GdO6 octahedra. The corner-sharing octahedral tilt angles range from 50-62°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to two equivalent Sr(1), one Gd(3), and two equivalent Gd(2) atoms. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Ba(1), one Gd(4), and two equivalent Gd(1) atoms. In the third O site, O(3) is bonded to two equivalent Sr(1), one Gd(3), and two equivalent Gd(4) atoms to form OSr2Gd3 square pyramids that share corners with two equivalent O(5)Sr2Gd3 trigonal bipyramids, edges with two equivalent O(4)Ba2Gd3 square pyramids, edges with two equivalent O(3)Sr2Gd3 square pyramids, and  an edgeedge with one O(5)Sr2Gd3 trigonal bipyramid. In the fourth O site, O(4) is bonded to two equivalent Ba(1), one Gd(4), and two equivalent Gd(3) atoms to form OBa2Gd3 square pyramids that share corners with two equivalent O(6)Ba2Gd3 trigonal bipyramids, edges with two equivalent O(4)Ba2Gd3 square pyramids, edges with two equivalent O(3)Sr2Gd3 square pyramids, and  an edgeedge with one O(6)Ba2Gd3 trigonal bipyramid. In the fifth O site, O(5) is bonded to two equivalent Sr(1), one Gd(1), and two equivalent Gd(2) atoms to form distorted OSr2Gd3 trigonal bipyramids that share corners with two equivalent O(3)Sr2Gd3 square pyramids,  an edgeedge with one O(3)Sr2Gd3 square pyramid, edges with two equivalent O(6)Ba2Gd3 trigonal bipyramids, and edges with two equivalent O(5)Sr2Gd3 trigonal bipyramids. In the sixth O site, O(6) is bonded to two equivalent Ba(1), one Gd(2), and two equivalent Gd(1) atoms to form distorted OBa2Gd3 trigonal bipyramids that share corners with two equivalent O(4)Ba2Gd3 square pyramids,  an edgeedge with one O(4)Ba2Gd3 square pyramid, edges with two equivalent O(6)Ba2Gd3 trigonal bipyramids, and edges with two equivalent O(5)Sr2Gd3 trigonal bipyramids. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to two equivalent Ba(1), one Gd(1), and two equivalent Gd(4) atoms. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to two equivalent Sr(1), one Gd(2), and two equivalent Gd(3) atoms. is represented by the CIF file [CIF]
data_BaSrGd4O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.505
_cell_length_b   10.409
_cell_length_c   12.222
_cell_angle_alpha   90.011
_cell_angle_beta   90.000
_cell_angle_gamma   89.998
_symmetry_Int_Tables_number   1
_cell_volume   445.898
_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
  Ba  Ba0  1  0.750  0.748  0.148  1.0
  Ba  Ba1  1  0.750  0.248  0.352  1.0
  Sr  Sr2  1  0.250  0.254  0.853  1.0
  Sr  Sr3  1  0.250  0.754  0.647  1.0
  Gd  Gd4  1  0.750  0.080  0.110  1.0
  Gd  Gd5  1  0.750  0.580  0.390  1.0
  Gd  Gd6  1  0.250  0.923  0.886  1.0
  Gd  Gd7  1  0.250  0.423  0.614  1.0
  Gd  Gd8  1  0.750  0.074  0.613  1.0
  Gd  Gd9  1  0.750  0.574  0.887  1.0
  Gd  Gd10  1  0.250  0.924  0.391  1.0
  Gd  Gd11  1  0.250  0.424  0.109  1.0
  O  O12  1  0.750  0.286  0.673  1.0
  O  O13  1  0.750  0.786  0.827  1.0
  O  O14  1  0.250  0.713  0.333  1.0
  O  O15  1  0.250  0.213  0.167  1.0
  O  O16  1  0.750  0.374  0.979  1.0
  O  O17  1  0.750  0.874  0.521  1.0
  O  O18  1  0.250  0.620  0.015  1.0
  O  O19  1  0.250  0.119  0.485  1.0
  O  O20  1  0.750  0.075  0.919  1.0
  O  O21  1  0.750  0.575  0.581  1.0
  O  O22  1  0.250  0.933  0.076  1.0
  O  O23  1  0.250  0.433  0.424  1.0
  O  O24  1  0.750  0.990  0.285  1.0
  O  O25  1  0.750  0.490  0.215  1.0
  O  O26  1  0.250  0.005  0.714  1.0
  O  O27  1  0.250  0.505  0.786  1.0
[/CIF]
.