The material structure described by BaSrYb4O8 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 Yb sites. In the first Yb site, Yb(1) is bonded to one O(1), one O(7), two equivalent O(2), and two equivalent O(6) atoms to form a mixture of distorted edge and corner-sharing YbO6 octahedra. The corner-sharing octahedral tilt angles range from 48-65°. In the second Yb site, Yb(2) is bonded to one O(2), one O(8), two equivalent O(1), and two equivalent O(5) atoms to form a mixture of distorted edge and corner-sharing YbO6 octahedra. The corner-sharing octahedral tilt angles range from 50-65°. In the third Yb site, Yb(3) is bonded to one O(3), one O(5), two equivalent O(4), and two equivalent O(8) atoms to form a mixture of edge and corner-sharing YbO6 octahedra. The corner-sharing octahedral tilt angles range from 50-65°. In the fourth Yb site, Yb(4) is bonded to one O(4), one O(6), two equivalent O(3), and two equivalent O(7) atoms to form a mixture of edge and corner-sharing YbO6 octahedra. The corner-sharing octahedral tilt angles range from 48-65°. There are eight inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), one Yb(1), and two equivalent Yb(2) atoms to form distorted OSr2Yb3 trigonal bipyramids that share corners with two equivalent O(3)Sr2Yb3 square pyramids,  a cornercorner with one O(7)Ba2Yb3 trigonal bipyramid, corners with two equivalent O(8)Sr2Yb3 trigonal bipyramids, corners with four equivalent O(5)Sr2Yb3 trigonal bipyramids,  an edgeedge with one O(3)Sr2Yb3 square pyramid, edges with two equivalent O(2)Ba2Yb3 trigonal bipyramids, edges with two equivalent O(1)Sr2Yb3 trigonal bipyramids, edges with two equivalent O(5)Sr2Yb3 trigonal bipyramids, and edges with two equivalent O(8)Sr2Yb3 trigonal bipyramids. In the second O site, O(2) is bonded to two equivalent Ba(1), one Yb(2), and two equivalent Yb(1) atoms to form distorted OBa2Yb3 trigonal bipyramids that share corners with two equivalent O(4)Ba2Yb3 square pyramids,  a cornercorner with one O(8)Sr2Yb3 trigonal bipyramid, corners with two equivalent O(7)Ba2Yb3 trigonal bipyramids, corners with two equivalent O(5)Sr2Yb3 trigonal bipyramids,  an edgeedge with one O(4)Ba2Yb3 square pyramid, edges with two equivalent O(2)Ba2Yb3 trigonal bipyramids, edges with two equivalent O(7)Ba2Yb3 trigonal bipyramids, and edges with two equivalent O(1)Sr2Yb3 trigonal bipyramids. In the third O site, O(3) is bonded to two equivalent Sr(1), one Yb(3), and two equivalent Yb(4) atoms to form OSr2Yb3 square pyramids that share corners with two equivalent O(7)Ba2Yb3 trigonal bipyramids, corners with two equivalent O(1)Sr2Yb3 trigonal bipyramids, corners with two equivalent O(8)Sr2Yb3 trigonal bipyramids, corners with three equivalent O(5)Sr2Yb3 trigonal bipyramids, edges with two equivalent O(4)Ba2Yb3 square pyramids, edges with two equivalent O(3)Sr2Yb3 square pyramids,  an edgeedge with one O(7)Ba2Yb3 trigonal bipyramid,  an edgeedge with one O(1)Sr2Yb3 trigonal bipyramid,  an edgeedge with one O(5)Sr2Yb3 trigonal bipyramid, and edges with two equivalent O(8)Sr2Yb3 trigonal bipyramids. In the fourth O site, O(4) is bonded to two equivalent Ba(1), one Yb(4), and two equivalent Yb(3) atoms to form distorted OBa2Yb3 square pyramids that share corners with two equivalent O(2)Ba2Yb3 trigonal bipyramids, corners with two equivalent O(7)Ba2Yb3 trigonal bipyramids, corners with two equivalent O(5)Sr2Yb3 trigonal bipyramids, corners with two equivalent O(8)Sr2Yb3 trigonal bipyramids, edges with two equivalent O(4)Ba2Yb3 square pyramids, edges with two equivalent O(3)Sr2Yb3 square pyramids,  an edgeedge with one O(2)Ba2Yb3 trigonal bipyramid,  an edgeedge with one O(8)Sr2Yb3 trigonal bipyramid, and edges with two equivalent O(7)Ba2Yb3 trigonal bipyramids. In the fifth O site, O(5) is bonded to two equivalent Sr(1), one Yb(3), and two equivalent Yb(2) atoms to form distorted OSr2Yb3 trigonal bipyramids that share corners with two equivalent O(4)Ba2Yb3 square pyramids, corners with three equivalent O(3)Sr2Yb3 square pyramids, corners with two equivalent O(2)Ba2Yb3 trigonal bipyramids, corners with four equivalent O(1)Sr2Yb3 trigonal bipyramids,  an edgeedge with one O(3)Sr2Yb3 square pyramid, edges with two equivalent O(1)Sr2Yb3 trigonal bipyramids, edges with two equivalent O(5)Sr2Yb3 trigonal bipyramids, and edges with four equivalent O(8)Sr2Yb3 trigonal bipyramids. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to two equivalent Ba(1), one Yb(4), and two equivalent Yb(1) atoms. In the seventh O site, O(7) is bonded to two equivalent Ba(1), one Yb(1), and two equivalent Yb(4) atoms to form distorted OBa2Yb3 trigonal bipyramids that share corners with two equivalent O(4)Ba2Yb3 square pyramids, corners with two equivalent O(3)Sr2Yb3 square pyramids,  a cornercorner with one O(1)Sr2Yb3 trigonal bipyramid, corners with two equivalent O(2)Ba2Yb3 trigonal bipyramids, corners with four equivalent O(7)Ba2Yb3 trigonal bipyramids,  an edgeedge with one O(3)Sr2Yb3 square pyramid, edges with two equivalent O(4)Ba2Yb3 square pyramids, and edges with two equivalent O(2)Ba2Yb3 trigonal bipyramids. In the eighth O site, O(8) is bonded to two equivalent Sr(1), one Yb(2), and two equivalent Yb(3) atoms to form distorted OSr2Yb3 trigonal bipyramids that share corners with two equivalent O(4)Ba2Yb3 square pyramids, corners with two equivalent O(3)Sr2Yb3 square pyramids,  a cornercorner with one O(2)Ba2Yb3 trigonal bipyramid, corners with two equivalent O(1)Sr2Yb3 trigonal bipyramids, corners with four equivalent O(8)Sr2Yb3 trigonal bipyramids,  an edgeedge with one O(4)Ba2Yb3 square pyramid, edges with two equivalent O(3)Sr2Yb3 square pyramids, edges with two equivalent O(1)Sr2Yb3 trigonal bipyramids, and edges with four equivalent O(5)Sr2Yb3 trigonal bipyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_BaSrYb4O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.498
_cell_length_b   10.085
_cell_length_c   12.047
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   424.979
_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  0.747  0.155  1.0
  Ba  Ba1  1  0.750  0.247  0.345  1.0
  Sr  Sr2  1  0.250  0.254  0.841  1.0
  Sr  Sr3  1  0.250  0.754  0.659  1.0
  Yb  Yb4  1  0.750  0.081  0.103  1.0
  Yb  Yb5  1  0.750  0.581  0.397  1.0
  Yb  Yb6  1  0.250  0.924  0.890  1.0
  Yb  Yb7  1  0.250  0.424  0.610  1.0
  Yb  Yb8  1  0.750  0.077  0.613  1.0
  Yb  Yb9  1  0.750  0.577  0.887  1.0
  Yb  Yb10  1  0.250  0.919  0.396  1.0
  Yb  Yb11  1  0.250  0.419  0.104  1.0
  O  O12  1  0.750  0.083  0.913  1.0
  O  O13  1  0.750  0.583  0.587  1.0
  O  O14  1  0.250  0.929  0.075  1.0
  O  O15  1  0.250  0.429  0.425  1.0
  O  O16  1  0.750  0.372  0.974  1.0
  O  O17  1  0.750  0.872  0.526  1.0
  O  O18  1  0.250  0.618  0.015  1.0
  O  O19  1  0.250  0.118  0.485  1.0
  O  O20  1  0.750  0.288  0.678  1.0
  O  O21  1  0.750  0.788  0.822  1.0
  O  O22  1  0.250  0.713  0.333  1.0
  O  O23  1  0.250  0.213  0.167  1.0
  O  O24  1  0.750  0.983  0.278  1.0
  O  O25  1  0.750  0.483  0.222  1.0
  O  O26  1  0.250  0.012  0.721  1.0
  O  O27  1  0.250  0.512  0.779  1.0
[/CIF]
.
The material structure described by BaSrYb4O8 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 Yb sites. In the first Yb site, Yb(1) is bonded to one O(1), one O(7), two equivalent O(2), and two equivalent O(6) atoms to form a mixture of distorted edge and corner-sharing YbO6 octahedra. The corner-sharing octahedral tilt angles range from 48-65°. In the second Yb site, Yb(2) is bonded to one O(2), one O(8), two equivalent O(1), and two equivalent O(5) atoms to form a mixture of distorted edge and corner-sharing YbO6 octahedra. The corner-sharing octahedral tilt angles range from 50-65°. In the third Yb site, Yb(3) is bonded to one O(3), one O(5), two equivalent O(4), and two equivalent O(8) atoms to form a mixture of edge and corner-sharing YbO6 octahedra. The corner-sharing octahedral tilt angles range from 50-65°. In the fourth Yb site, Yb(4) is bonded to one O(4), one O(6), two equivalent O(3), and two equivalent O(7) atoms to form a mixture of edge and corner-sharing YbO6 octahedra. The corner-sharing octahedral tilt angles range from 48-65°. There are eight inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), one Yb(1), and two equivalent Yb(2) atoms to form distorted OSr2Yb3 trigonal bipyramids that share corners with two equivalent O(3)Sr2Yb3 square pyramids,  a cornercorner with one O(7)Ba2Yb3 trigonal bipyramid, corners with two equivalent O(8)Sr2Yb3 trigonal bipyramids, corners with four equivalent O(5)Sr2Yb3 trigonal bipyramids,  an edgeedge with one O(3)Sr2Yb3 square pyramid, edges with two equivalent O(2)Ba2Yb3 trigonal bipyramids, edges with two equivalent O(1)Sr2Yb3 trigonal bipyramids, edges with two equivalent O(5)Sr2Yb3 trigonal bipyramids, and edges with two equivalent O(8)Sr2Yb3 trigonal bipyramids. In the second O site, O(2) is bonded to two equivalent Ba(1), one Yb(2), and two equivalent Yb(1) atoms to form distorted OBa2Yb3 trigonal bipyramids that share corners with two equivalent O(4)Ba2Yb3 square pyramids,  a cornercorner with one O(8)Sr2Yb3 trigonal bipyramid, corners with two equivalent O(7)Ba2Yb3 trigonal bipyramids, corners with two equivalent O(5)Sr2Yb3 trigonal bipyramids,  an edgeedge with one O(4)Ba2Yb3 square pyramid, edges with two equivalent O(2)Ba2Yb3 trigonal bipyramids, edges with two equivalent O(7)Ba2Yb3 trigonal bipyramids, and edges with two equivalent O(1)Sr2Yb3 trigonal bipyramids. In the third O site, O(3) is bonded to two equivalent Sr(1), one Yb(3), and two equivalent Yb(4) atoms to form OSr2Yb3 square pyramids that share corners with two equivalent O(7)Ba2Yb3 trigonal bipyramids, corners with two equivalent O(1)Sr2Yb3 trigonal bipyramids, corners with two equivalent O(8)Sr2Yb3 trigonal bipyramids, corners with three equivalent O(5)Sr2Yb3 trigonal bipyramids, edges with two equivalent O(4)Ba2Yb3 square pyramids, edges with two equivalent O(3)Sr2Yb3 square pyramids,  an edgeedge with one O(7)Ba2Yb3 trigonal bipyramid,  an edgeedge with one O(1)Sr2Yb3 trigonal bipyramid,  an edgeedge with one O(5)Sr2Yb3 trigonal bipyramid, and edges with two equivalent O(8)Sr2Yb3 trigonal bipyramids. In the fourth O site, O(4) is bonded to two equivalent Ba(1), one Yb(4), and two equivalent Yb(3) atoms to form distorted OBa2Yb3 square pyramids that share corners with two equivalent O(2)Ba2Yb3 trigonal bipyramids, corners with two equivalent O(7)Ba2Yb3 trigonal bipyramids, corners with two equivalent O(5)Sr2Yb3 trigonal bipyramids, corners with two equivalent O(8)Sr2Yb3 trigonal bipyramids, edges with two equivalent O(4)Ba2Yb3 square pyramids, edges with two equivalent O(3)Sr2Yb3 square pyramids,  an edgeedge with one O(2)Ba2Yb3 trigonal bipyramid,  an edgeedge with one O(8)Sr2Yb3 trigonal bipyramid, and edges with two equivalent O(7)Ba2Yb3 trigonal bipyramids. In the fifth O site, O(5) is bonded to two equivalent Sr(1), one Yb(3), and two equivalent Yb(2) atoms to form distorted OSr2Yb3 trigonal bipyramids that share corners with two equivalent O(4)Ba2Yb3 square pyramids, corners with three equivalent O(3)Sr2Yb3 square pyramids, corners with two equivalent O(2)Ba2Yb3 trigonal bipyramids, corners with four equivalent O(1)Sr2Yb3 trigonal bipyramids,  an edgeedge with one O(3)Sr2Yb3 square pyramid, edges with two equivalent O(1)Sr2Yb3 trigonal bipyramids, edges with two equivalent O(5)Sr2Yb3 trigonal bipyramids, and edges with four equivalent O(8)Sr2Yb3 trigonal bipyramids. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to two equivalent Ba(1), one Yb(4), and two equivalent Yb(1) atoms. In the seventh O site, O(7) is bonded to two equivalent Ba(1), one Yb(1), and two equivalent Yb(4) atoms to form distorted OBa2Yb3 trigonal bipyramids that share corners with two equivalent O(4)Ba2Yb3 square pyramids, corners with two equivalent O(3)Sr2Yb3 square pyramids,  a cornercorner with one O(1)Sr2Yb3 trigonal bipyramid, corners with two equivalent O(2)Ba2Yb3 trigonal bipyramids, corners with four equivalent O(7)Ba2Yb3 trigonal bipyramids,  an edgeedge with one O(3)Sr2Yb3 square pyramid, edges with two equivalent O(4)Ba2Yb3 square pyramids, and edges with two equivalent O(2)Ba2Yb3 trigonal bipyramids. In the eighth O site, O(8) is bonded to two equivalent Sr(1), one Yb(2), and two equivalent Yb(3) atoms to form distorted OSr2Yb3 trigonal bipyramids that share corners with two equivalent O(4)Ba2Yb3 square pyramids, corners with two equivalent O(3)Sr2Yb3 square pyramids,  a cornercorner with one O(2)Ba2Yb3 trigonal bipyramid, corners with two equivalent O(1)Sr2Yb3 trigonal bipyramids, corners with four equivalent O(8)Sr2Yb3 trigonal bipyramids,  an edgeedge with one O(4)Ba2Yb3 square pyramid, edges with two equivalent O(3)Sr2Yb3 square pyramids, edges with two equivalent O(1)Sr2Yb3 trigonal bipyramids, and edges with four equivalent O(5)Sr2Yb3 trigonal bipyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_BaSrYb4O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.498
_cell_length_b   10.085
_cell_length_c   12.047
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   424.979
_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  0.747  0.155  1.0
  Ba  Ba1  1  0.750  0.247  0.345  1.0
  Sr  Sr2  1  0.250  0.254  0.841  1.0
  Sr  Sr3  1  0.250  0.754  0.659  1.0
  Yb  Yb4  1  0.750  0.081  0.103  1.0
  Yb  Yb5  1  0.750  0.581  0.397  1.0
  Yb  Yb6  1  0.250  0.924  0.890  1.0
  Yb  Yb7  1  0.250  0.424  0.610  1.0
  Yb  Yb8  1  0.750  0.077  0.613  1.0
  Yb  Yb9  1  0.750  0.577  0.887  1.0
  Yb  Yb10  1  0.250  0.919  0.396  1.0
  Yb  Yb11  1  0.250  0.419  0.104  1.0
  O  O12  1  0.750  0.083  0.913  1.0
  O  O13  1  0.750  0.583  0.587  1.0
  O  O14  1  0.250  0.929  0.075  1.0
  O  O15  1  0.250  0.429  0.425  1.0
  O  O16  1  0.750  0.372  0.974  1.0
  O  O17  1  0.750  0.872  0.526  1.0
  O  O18  1  0.250  0.618  0.015  1.0
  O  O19  1  0.250  0.118  0.485  1.0
  O  O20  1  0.750  0.288  0.678  1.0
  O  O21  1  0.750  0.788  0.822  1.0
  O  O22  1  0.250  0.713  0.333  1.0
  O  O23  1  0.250  0.213  0.167  1.0
  O  O24  1  0.750  0.983  0.278  1.0
  O  O25  1  0.750  0.483  0.222  1.0
  O  O26  1  0.250  0.012  0.721  1.0
  O  O27  1  0.250  0.512  0.779  1.0
[/CIF]
.