The crystal structure described by BaSrTm4O8 crystallizes in the orthorhombic Pmc2_1 space group. Ba(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(4), two equivalent O(6), and two equivalent O(8) atoms. Sr(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), two equivalent O(5), and two equivalent O(7) atoms. There are four inequivalent Tm sites. In the first Tm site, Tm(1) is bonded to one O(3), one O(7), two equivalent O(2), and two equivalent O(4) atoms to form a mixture of edge and corner-sharing TmO6 octahedra. The corner-sharing octahedral tilt angles range from 51-59°. In the second Tm site, Tm(2) is bonded to one O(4), one O(8), two equivalent O(1), and two equivalent O(3) atoms to form a mixture of edge and corner-sharing TmO6 octahedra. The corner-sharing octahedral tilt angles range from 49-59°. In the third Tm site, Tm(3) is bonded to one O(1), one O(5), two equivalent O(6), and two equivalent O(8) atoms to form a mixture of edge and corner-sharing TmO6 octahedra. The corner-sharing octahedral tilt angles range from 49-59°. In the fourth Tm site, Tm(4) is bonded to one O(2), one O(6), two equivalent O(5), and two equivalent O(7) atoms to form a mixture of edge and corner-sharing TmO6 octahedra. The corner-sharing octahedral tilt angles range from 51-59°. There are eight inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ba(1), one Tm(3), and two equivalent Tm(2) atoms to form distorted OBa2Tm3 trigonal bipyramids that share corners with two equivalent O(4)Ba2Tm3 square pyramids, corners with two equivalent O(3)Sr2Tm3 square pyramids,  a cornercorner with one O(5)Sr2Tm3 trigonal bipyramid, corners with two equivalent O(6)Ba2Tm3 trigonal bipyramids, corners with four equivalent O(1)Ba2Tm3 trigonal bipyramids,  an edgeedge with one O(3)Sr2Tm3 square pyramid, edges with two equivalent O(4)Ba2Tm3 square pyramids, and edges with two equivalent O(6)Ba2Tm3 trigonal bipyramids. In the second O site, O(2) is bonded to two equivalent Sr(1), one Tm(4), and two equivalent Tm(1) atoms to form distorted OSr2Tm3 trigonal bipyramids that share corners with two equivalent O(4)Ba2Tm3 square pyramids, corners with two equivalent O(3)Sr2Tm3 square pyramids,  a cornercorner with one O(6)Ba2Tm3 trigonal bipyramid, corners with two equivalent O(5)Sr2Tm3 trigonal bipyramids, corners with four equivalent O(2)Sr2Tm3 trigonal bipyramids,  an edgeedge with one O(4)Ba2Tm3 square pyramid, edges with two equivalent O(3)Sr2Tm3 square pyramids, and edges with two equivalent O(5)Sr2Tm3 trigonal bipyramids. In the third O site, O(3) is bonded to two equivalent Sr(1), one Tm(1), and two equivalent Tm(2) atoms to form OSr2Tm3 square pyramids that share corners with two equivalent O(1)Ba2Tm3 trigonal bipyramids, corners with two equivalent O(2)Sr2Tm3 trigonal bipyramids, corners with two equivalent O(5)Sr2Tm3 trigonal bipyramids, edges with two equivalent O(4)Ba2Tm3 square pyramids, edges with two equivalent O(3)Sr2Tm3 square pyramids,  an edgeedge with one O(1)Ba2Tm3 trigonal bipyramid,  an edgeedge with one O(5)Sr2Tm3 trigonal bipyramid, and edges with two equivalent O(2)Sr2Tm3 trigonal bipyramids. In the fourth O site, O(4) is bonded to two equivalent Ba(1), one Tm(2), and two equivalent Tm(1) atoms to form distorted OBa2Tm3 square pyramids that share corners with two equivalent O(1)Ba2Tm3 trigonal bipyramids, corners with two equivalent O(6)Ba2Tm3 trigonal bipyramids, corners with two equivalent O(2)Sr2Tm3 trigonal bipyramids, edges with two equivalent O(4)Ba2Tm3 square pyramids, edges with two equivalent O(3)Sr2Tm3 square pyramids,  an edgeedge with one O(6)Ba2Tm3 trigonal bipyramid,  an edgeedge with one O(2)Sr2Tm3 trigonal bipyramid, and edges with two equivalent O(1)Ba2Tm3 trigonal bipyramids. In the fifth O site, O(5) is bonded to two equivalent Sr(1), one Tm(3), and two equivalent Tm(4) atoms to form distorted OSr2Tm3 trigonal bipyramids that share corners with two equivalent O(3)Sr2Tm3 square pyramids,  a cornercorner with one O(1)Ba2Tm3 trigonal bipyramid, corners with two equivalent O(2)Sr2Tm3 trigonal bipyramids,  an edgeedge with one O(3)Sr2Tm3 square pyramid, edges with two equivalent O(6)Ba2Tm3 trigonal bipyramids, edges with two equivalent O(2)Sr2Tm3 trigonal bipyramids, and edges with two equivalent O(5)Sr2Tm3 trigonal bipyramids. In the sixth O site, O(6) is bonded to two equivalent Ba(1), one Tm(4), and two equivalent Tm(3) atoms to form distorted OBa2Tm3 trigonal bipyramids that share corners with two equivalent O(4)Ba2Tm3 square pyramids,  a cornercorner with one O(2)Sr2Tm3 trigonal bipyramid, corners with two equivalent O(1)Ba2Tm3 trigonal bipyramids,  an edgeedge with one O(4)Ba2Tm3 square pyramid, edges with two equivalent O(1)Ba2Tm3 trigonal bipyramids, edges with two equivalent O(6)Ba2Tm3 trigonal bipyramids, and edges with two equivalent O(5)Sr2Tm3 trigonal bipyramids. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to two equivalent Sr(1), one Tm(1), and two equivalent Tm(4) atoms. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to two equivalent Ba(1), one Tm(2), and two equivalent Tm(3) atoms. is represented by the CIF card [CIF]
data_BaSrTm4O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.405
_cell_length_b   10.260
_cell_length_c   11.985
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   418.703
_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  0.149  1.0
  Ba  Ba1  1  0.750  0.247  0.351  1.0
  Sr  Sr2  1  0.250  0.254  0.851  1.0
  Sr  Sr3  1  0.250  0.754  0.649  1.0
  Tm  Tm4  1  0.750  0.076  0.612  1.0
  Tm  Tm5  1  0.750  0.576  0.888  1.0
  Tm  Tm6  1  0.250  0.921  0.394  1.0
  Tm  Tm7  1  0.250  0.421  0.106  1.0
  Tm  Tm8  1  0.750  0.075  0.108  1.0
  Tm  Tm9  1  0.750  0.575  0.392  1.0
  Tm  Tm10  1  0.250  0.928  0.885  1.0
  Tm  Tm11  1  0.250  0.428  0.615  1.0
  O  O12  1  0.750  0.981  0.284  1.0
  O  O13  1  0.750  0.481  0.216  1.0
  O  O14  1  0.250  0.017  0.717  1.0
  O  O15  1  0.250  0.517  0.783  1.0
  O  O16  1  0.750  0.379  0.977  1.0
  O  O17  1  0.750  0.879  0.523  1.0
  O  O18  1  0.250  0.614  0.015  1.0
  O  O19  1  0.250  0.114  0.485  1.0
  O  O20  1  0.750  0.077  0.922  1.0
  O  O21  1  0.750  0.577  0.578  1.0
  O  O22  1  0.250  0.933  0.071  1.0
  O  O23  1  0.250  0.433  0.429  1.0
  O  O24  1  0.750  0.290  0.667  1.0
  O  O25  1  0.750  0.790  0.833  1.0
  O  O26  1  0.250  0.710  0.341  1.0
  O  O27  1  0.250  0.210  0.159  1.0
[/CIF]
.
The crystal structure described by BaSrTm4O8 crystallizes in the orthorhombic Pmc2_1 space group. Ba(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(4), two equivalent O(6), and two equivalent O(8) atoms. Sr(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), two equivalent O(5), and two equivalent O(7) atoms. There are four inequivalent Tm sites. In the first Tm site, Tm(1) is bonded to one O(3), one O(7), two equivalent O(2), and two equivalent O(4) atoms to form a mixture of edge and corner-sharing TmO6 octahedra. The corner-sharing octahedral tilt angles range from 51-59°. In the second Tm site, Tm(2) is bonded to one O(4), one O(8), two equivalent O(1), and two equivalent O(3) atoms to form a mixture of edge and corner-sharing TmO6 octahedra. The corner-sharing octahedral tilt angles range from 49-59°. In the third Tm site, Tm(3) is bonded to one O(1), one O(5), two equivalent O(6), and two equivalent O(8) atoms to form a mixture of edge and corner-sharing TmO6 octahedra. The corner-sharing octahedral tilt angles range from 49-59°. In the fourth Tm site, Tm(4) is bonded to one O(2), one O(6), two equivalent O(5), and two equivalent O(7) atoms to form a mixture of edge and corner-sharing TmO6 octahedra. The corner-sharing octahedral tilt angles range from 51-59°. There are eight inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ba(1), one Tm(3), and two equivalent Tm(2) atoms to form distorted OBa2Tm3 trigonal bipyramids that share corners with two equivalent O(4)Ba2Tm3 square pyramids, corners with two equivalent O(3)Sr2Tm3 square pyramids,  a cornercorner with one O(5)Sr2Tm3 trigonal bipyramid, corners with two equivalent O(6)Ba2Tm3 trigonal bipyramids, corners with four equivalent O(1)Ba2Tm3 trigonal bipyramids,  an edgeedge with one O(3)Sr2Tm3 square pyramid, edges with two equivalent O(4)Ba2Tm3 square pyramids, and edges with two equivalent O(6)Ba2Tm3 trigonal bipyramids. In the second O site, O(2) is bonded to two equivalent Sr(1), one Tm(4), and two equivalent Tm(1) atoms to form distorted OSr2Tm3 trigonal bipyramids that share corners with two equivalent O(4)Ba2Tm3 square pyramids, corners with two equivalent O(3)Sr2Tm3 square pyramids,  a cornercorner with one O(6)Ba2Tm3 trigonal bipyramid, corners with two equivalent O(5)Sr2Tm3 trigonal bipyramids, corners with four equivalent O(2)Sr2Tm3 trigonal bipyramids,  an edgeedge with one O(4)Ba2Tm3 square pyramid, edges with two equivalent O(3)Sr2Tm3 square pyramids, and edges with two equivalent O(5)Sr2Tm3 trigonal bipyramids. In the third O site, O(3) is bonded to two equivalent Sr(1), one Tm(1), and two equivalent Tm(2) atoms to form OSr2Tm3 square pyramids that share corners with two equivalent O(1)Ba2Tm3 trigonal bipyramids, corners with two equivalent O(2)Sr2Tm3 trigonal bipyramids, corners with two equivalent O(5)Sr2Tm3 trigonal bipyramids, edges with two equivalent O(4)Ba2Tm3 square pyramids, edges with two equivalent O(3)Sr2Tm3 square pyramids,  an edgeedge with one O(1)Ba2Tm3 trigonal bipyramid,  an edgeedge with one O(5)Sr2Tm3 trigonal bipyramid, and edges with two equivalent O(2)Sr2Tm3 trigonal bipyramids. In the fourth O site, O(4) is bonded to two equivalent Ba(1), one Tm(2), and two equivalent Tm(1) atoms to form distorted OBa2Tm3 square pyramids that share corners with two equivalent O(1)Ba2Tm3 trigonal bipyramids, corners with two equivalent O(6)Ba2Tm3 trigonal bipyramids, corners with two equivalent O(2)Sr2Tm3 trigonal bipyramids, edges with two equivalent O(4)Ba2Tm3 square pyramids, edges with two equivalent O(3)Sr2Tm3 square pyramids,  an edgeedge with one O(6)Ba2Tm3 trigonal bipyramid,  an edgeedge with one O(2)Sr2Tm3 trigonal bipyramid, and edges with two equivalent O(1)Ba2Tm3 trigonal bipyramids. In the fifth O site, O(5) is bonded to two equivalent Sr(1), one Tm(3), and two equivalent Tm(4) atoms to form distorted OSr2Tm3 trigonal bipyramids that share corners with two equivalent O(3)Sr2Tm3 square pyramids,  a cornercorner with one O(1)Ba2Tm3 trigonal bipyramid, corners with two equivalent O(2)Sr2Tm3 trigonal bipyramids,  an edgeedge with one O(3)Sr2Tm3 square pyramid, edges with two equivalent O(6)Ba2Tm3 trigonal bipyramids, edges with two equivalent O(2)Sr2Tm3 trigonal bipyramids, and edges with two equivalent O(5)Sr2Tm3 trigonal bipyramids. In the sixth O site, O(6) is bonded to two equivalent Ba(1), one Tm(4), and two equivalent Tm(3) atoms to form distorted OBa2Tm3 trigonal bipyramids that share corners with two equivalent O(4)Ba2Tm3 square pyramids,  a cornercorner with one O(2)Sr2Tm3 trigonal bipyramid, corners with two equivalent O(1)Ba2Tm3 trigonal bipyramids,  an edgeedge with one O(4)Ba2Tm3 square pyramid, edges with two equivalent O(1)Ba2Tm3 trigonal bipyramids, edges with two equivalent O(6)Ba2Tm3 trigonal bipyramids, and edges with two equivalent O(5)Sr2Tm3 trigonal bipyramids. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to two equivalent Sr(1), one Tm(1), and two equivalent Tm(4) atoms. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to two equivalent Ba(1), one Tm(2), and two equivalent Tm(3) atoms. is represented by the CIF card [CIF]
data_BaSrTm4O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.405
_cell_length_b   10.260
_cell_length_c   11.985
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   418.703
_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  0.149  1.0
  Ba  Ba1  1  0.750  0.247  0.351  1.0
  Sr  Sr2  1  0.250  0.254  0.851  1.0
  Sr  Sr3  1  0.250  0.754  0.649  1.0
  Tm  Tm4  1  0.750  0.076  0.612  1.0
  Tm  Tm5  1  0.750  0.576  0.888  1.0
  Tm  Tm6  1  0.250  0.921  0.394  1.0
  Tm  Tm7  1  0.250  0.421  0.106  1.0
  Tm  Tm8  1  0.750  0.075  0.108  1.0
  Tm  Tm9  1  0.750  0.575  0.392  1.0
  Tm  Tm10  1  0.250  0.928  0.885  1.0
  Tm  Tm11  1  0.250  0.428  0.615  1.0
  O  O12  1  0.750  0.981  0.284  1.0
  O  O13  1  0.750  0.481  0.216  1.0
  O  O14  1  0.250  0.017  0.717  1.0
  O  O15  1  0.250  0.517  0.783  1.0
  O  O16  1  0.750  0.379  0.977  1.0
  O  O17  1  0.750  0.879  0.523  1.0
  O  O18  1  0.250  0.614  0.015  1.0
  O  O19  1  0.250  0.114  0.485  1.0
  O  O20  1  0.750  0.077  0.922  1.0
  O  O21  1  0.750  0.577  0.578  1.0
  O  O22  1  0.250  0.933  0.071  1.0
  O  O23  1  0.250  0.433  0.429  1.0
  O  O24  1  0.750  0.290  0.667  1.0
  O  O25  1  0.750  0.790  0.833  1.0
  O  O26  1  0.250  0.710  0.341  1.0
  O  O27  1  0.250  0.210  0.159  1.0
[/CIF]
.