The crystal structure described by TmBr2 is Baddeleyite-like structured and crystallizes in the orthorhombic Pbca space group. Tm(1) is bonded in a 7-coordinate geometry to three equivalent Br(1) and four equivalent Br(2) atoms. There are two inequivalent Br sites. In the first Br site, Br(1) is bonded in a trigonal planar geometry to three equivalent Tm(1) atoms. In the second Br site, Br(2) is bonded to four equivalent Tm(1) atoms to form a mixture of distorted corner and edge-sharing BrTm4 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_TmBr2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.584
_cell_length_b   7.704
_cell_length_c   12.784
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   648.431
_cell_formula_units_Z   8
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
  Tm  Tm0  1  0.169  0.548  0.903  1.0
  Tm  Tm1  1  0.831  0.452  0.097  1.0
  Tm  Tm2  1  0.331  0.048  0.097  1.0
  Tm  Tm3  1  0.831  0.952  0.403  1.0
  Tm  Tm4  1  0.669  0.952  0.903  1.0
  Tm  Tm5  1  0.169  0.048  0.597  1.0
  Tm  Tm6  1  0.669  0.452  0.597  1.0
  Tm  Tm7  1  0.331  0.548  0.403  1.0
  Br  Br8  1  0.296  0.877  0.794  1.0
  Br  Br9  1  0.704  0.123  0.206  1.0
  Br  Br10  1  0.204  0.377  0.206  1.0
  Br  Br11  1  0.704  0.623  0.294  1.0
  Br  Br12  1  0.796  0.623  0.794  1.0
  Br  Br13  1  0.296  0.377  0.706  1.0
  Br  Br14  1  0.796  0.123  0.706  1.0
  Br  Br15  1  0.204  0.877  0.294  1.0
  Br  Br16  1  0.025  0.703  0.543  1.0
  Br  Br17  1  0.975  0.297  0.457  1.0
  Br  Br18  1  0.475  0.203  0.457  1.0
  Br  Br19  1  0.975  0.797  0.043  1.0
  Br  Br20  1  0.525  0.797  0.543  1.0
  Br  Br21  1  0.025  0.203  0.957  1.0
  Br  Br22  1  0.525  0.297  0.957  1.0
  Br  Br23  1  0.475  0.703  0.043  1.0
[/CIF]
.
The crystal structure described by TmBr2 is Baddeleyite-like structured and crystallizes in the orthorhombic Pbca space group. Tm(1) is bonded in a 7-coordinate geometry to three equivalent Br(1) and four equivalent Br(2) atoms. There are two inequivalent Br sites. In the first Br site, Br(1) is bonded in a trigonal planar geometry to three equivalent Tm(1) atoms. In the second Br site, Br(2) is bonded to four equivalent Tm(1) atoms to form a mixture of distorted corner and edge-sharing BrTm4 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_TmBr2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.584
_cell_length_b   7.704
_cell_length_c   12.784
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   648.431
_cell_formula_units_Z   8
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
  Tm  Tm0  1  0.169  0.548  0.903  1.0
  Tm  Tm1  1  0.831  0.452  0.097  1.0
  Tm  Tm2  1  0.331  0.048  0.097  1.0
  Tm  Tm3  1  0.831  0.952  0.403  1.0
  Tm  Tm4  1  0.669  0.952  0.903  1.0
  Tm  Tm5  1  0.169  0.048  0.597  1.0
  Tm  Tm6  1  0.669  0.452  0.597  1.0
  Tm  Tm7  1  0.331  0.548  0.403  1.0
  Br  Br8  1  0.296  0.877  0.794  1.0
  Br  Br9  1  0.704  0.123  0.206  1.0
  Br  Br10  1  0.204  0.377  0.206  1.0
  Br  Br11  1  0.704  0.623  0.294  1.0
  Br  Br12  1  0.796  0.623  0.794  1.0
  Br  Br13  1  0.296  0.377  0.706  1.0
  Br  Br14  1  0.796  0.123  0.706  1.0
  Br  Br15  1  0.204  0.877  0.294  1.0
  Br  Br16  1  0.025  0.703  0.543  1.0
  Br  Br17  1  0.975  0.297  0.457  1.0
  Br  Br18  1  0.475  0.203  0.457  1.0
  Br  Br19  1  0.975  0.797  0.043  1.0
  Br  Br20  1  0.525  0.797  0.543  1.0
  Br  Br21  1  0.025  0.203  0.957  1.0
  Br  Br22  1  0.525  0.297  0.957  1.0
  Br  Br23  1  0.475  0.703  0.043  1.0
[/CIF]
.