The material structure described by BaSrI4 is Hydrophilite-derived structured and crystallizes in the monoclinic P2_1/c space group. Ba(1) is bonded to one I(2), one I(4), two equivalent I(1), and two equivalent I(3) atoms to form distorted BaI6 pentagonal pyramids that share corners with two equivalent Ba(1)I6 pentagonal pyramids, corners with five equivalent Sr(1)I6 pentagonal pyramids,  an edgeedge with one Ba(1)I6 pentagonal pyramid, and  a faceface with one Sr(1)I6 pentagonal pyramid. Sr(1) is bonded to one I(1), one I(3), two equivalent I(2), and two equivalent I(4) atoms to form distorted SrI6 pentagonal pyramids that share corners with two equivalent Sr(1)I6 pentagonal pyramids, corners with five equivalent Ba(1)I6 pentagonal pyramids,  an edgeedge with one Sr(1)I6 pentagonal pyramid, and  a faceface with one Ba(1)I6 pentagonal pyramid. There are four inequivalent I sites. In the first I site, I(1) is bonded in a distorted T-shaped geometry to two equivalent Ba(1) and one Sr(1) atom. In the second I site, I(2) is bonded in a trigonal non-coplanar geometry to one Ba(1) and two equivalent Sr(1) atoms. In the third I site, I(3) is bonded in a distorted trigonal planar geometry to two equivalent Ba(1) and one Sr(1) atom. In the fourth I site, I(4) is bonded in a trigonal planar geometry to one Ba(1) and two equivalent Sr(1) atoms. is represented by the CIF file [CIF]
data_BaSrI4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.424
_cell_length_b   10.377
_cell_length_c   10.877
_cell_angle_alpha   59.613
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1209.636
_cell_formula_units_Z   4
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  0.943  0.519  0.736  1.0
  Ba  Ba1  1  0.443  0.481  0.764  1.0
  Ba  Ba2  1  0.557  0.519  0.236  1.0
  Ba  Ba3  1  0.057  0.481  0.264  1.0
  Sr  Sr4  1  0.318  0.959  0.656  1.0
  Sr  Sr5  1  0.818  0.041  0.844  1.0
  Sr  Sr6  1  0.182  0.959  0.156  1.0
  Sr  Sr7  1  0.682  0.041  0.344  1.0
  I  I8  1  0.002  0.736  0.384  1.0
  I  I9  1  0.453  0.835  0.463  1.0
  I  I10  1  0.696  0.394  0.690  1.0
  I  I11  1  0.810  0.856  0.658  1.0
  I  I12  1  0.310  0.144  0.842  1.0
  I  I13  1  0.196  0.606  0.810  1.0
  I  I14  1  0.953  0.165  0.037  1.0
  I  I15  1  0.502  0.264  0.116  1.0
  I  I16  1  0.498  0.736  0.884  1.0
  I  I17  1  0.047  0.835  0.963  1.0
  I  I18  1  0.804  0.394  0.190  1.0
  I  I19  1  0.690  0.856  0.158  1.0
  I  I20  1  0.190  0.144  0.342  1.0
  I  I21  1  0.304  0.606  0.310  1.0
  I  I22  1  0.547  0.165  0.537  1.0
  I  I23  1  0.998  0.264  0.616  1.0
[/CIF]
.
The material structure described by BaSrI4 is Hydrophilite-derived structured and crystallizes in the monoclinic P2_1/c space group. Ba(1) is bonded to one I(2), one I(4), two equivalent I(1), and two equivalent I(3) atoms to form distorted BaI6 pentagonal pyramids that share corners with two equivalent Ba(1)I6 pentagonal pyramids, corners with five equivalent Sr(1)I6 pentagonal pyramids,  an edgeedge with one Ba(1)I6 pentagonal pyramid, and  a faceface with one Sr(1)I6 pentagonal pyramid. Sr(1) is bonded to one I(1), one I(3), two equivalent I(2), and two equivalent I(4) atoms to form distorted SrI6 pentagonal pyramids that share corners with two equivalent Sr(1)I6 pentagonal pyramids, corners with five equivalent Ba(1)I6 pentagonal pyramids,  an edgeedge with one Sr(1)I6 pentagonal pyramid, and  a faceface with one Ba(1)I6 pentagonal pyramid. There are four inequivalent I sites. In the first I site, I(1) is bonded in a distorted T-shaped geometry to two equivalent Ba(1) and one Sr(1) atom. In the second I site, I(2) is bonded in a trigonal non-coplanar geometry to one Ba(1) and two equivalent Sr(1) atoms. In the third I site, I(3) is bonded in a distorted trigonal planar geometry to two equivalent Ba(1) and one Sr(1) atom. In the fourth I site, I(4) is bonded in a trigonal planar geometry to one Ba(1) and two equivalent Sr(1) atoms. is represented by the CIF file [CIF]
data_BaSrI4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.424
_cell_length_b   10.377
_cell_length_c   10.877
_cell_angle_alpha   59.613
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1209.636
_cell_formula_units_Z   4
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  0.943  0.519  0.736  1.0
  Ba  Ba1  1  0.443  0.481  0.764  1.0
  Ba  Ba2  1  0.557  0.519  0.236  1.0
  Ba  Ba3  1  0.057  0.481  0.264  1.0
  Sr  Sr4  1  0.318  0.959  0.656  1.0
  Sr  Sr5  1  0.818  0.041  0.844  1.0
  Sr  Sr6  1  0.182  0.959  0.156  1.0
  Sr  Sr7  1  0.682  0.041  0.344  1.0
  I  I8  1  0.002  0.736  0.384  1.0
  I  I9  1  0.453  0.835  0.463  1.0
  I  I10  1  0.696  0.394  0.690  1.0
  I  I11  1  0.810  0.856  0.658  1.0
  I  I12  1  0.310  0.144  0.842  1.0
  I  I13  1  0.196  0.606  0.810  1.0
  I  I14  1  0.953  0.165  0.037  1.0
  I  I15  1  0.502  0.264  0.116  1.0
  I  I16  1  0.498  0.736  0.884  1.0
  I  I17  1  0.047  0.835  0.963  1.0
  I  I18  1  0.804  0.394  0.190  1.0
  I  I19  1  0.690  0.856  0.158  1.0
  I  I20  1  0.190  0.144  0.342  1.0
  I  I21  1  0.304  0.606  0.310  1.0
  I  I22  1  0.547  0.165  0.537  1.0
  I  I23  1  0.998  0.264  0.616  1.0
[/CIF]
.