The compound described by Eu(BiSe2)2 crystallizes in the orthorhombic Pnma space group. Eu(1) is bonded in a 8-coordinate geometry to two equivalent Se(1), two equivalent Se(2), two equivalent Se(3), and two equivalent Se(4) atoms. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to one Se(2), two equivalent Se(4), and three equivalent Se(1) atoms to form a mixture of corner and edge-sharing BiSe6 octahedra. The corner-sharing octahedral tilt angles range from 48-70°. In the second Bi site, Bi(2) is bonded to one Se(4), two equivalent Se(2), and three equivalent Se(3) atoms to form a mixture of corner and edge-sharing BiSe6 octahedra. The corner-sharing octahedral tilt angles range from 48-70°. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded to two equivalent Eu(1) and three equivalent Bi(1) atoms to form a mixture of corner and edge-sharing SeEu2Bi3 square pyramids. In the second Se site, Se(2) is bonded to two equivalent Eu(1), one Bi(1), and two equivalent Bi(2) atoms to form a mixture of distorted corner and edge-sharing SeEu2Bi3 trigonal bipyramids. In the third Se site, Se(3) is bonded to two equivalent Eu(1) and three equivalent Bi(2) atoms to form a mixture of corner and edge-sharing SeEu2Bi3 trigonal bipyramids. In the fourth Se site, Se(4) is bonded to two equivalent Eu(1), one Bi(2), and two equivalent Bi(1) atoms to form a mixture of distorted corner and edge-sharing SeEu2Bi3 trigonal bipyramids. is represented by the CIF card [CIF]
data_Eu(BiSe2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.250
_cell_length_b   12.513
_cell_length_c   15.451
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   821.609
_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
  Eu  Eu0  1  0.750  0.254  0.162  1.0
  Eu  Eu1  1  0.750  0.754  0.338  1.0
  Eu  Eu2  1  0.250  0.746  0.838  1.0
  Eu  Eu3  1  0.250  0.246  0.662  1.0
  Bi  Bi4  1  0.750  0.429  0.900  1.0
  Bi  Bi5  1  0.750  0.929  0.600  1.0
  Bi  Bi6  1  0.250  0.571  0.100  1.0
  Bi  Bi7  1  0.250  0.071  0.400  1.0
  Bi  Bi8  1  0.750  0.421  0.390  1.0
  Bi  Bi9  1  0.750  0.921  0.110  1.0
  Bi  Bi10  1  0.250  0.579  0.610  1.0
  Bi  Bi11  1  0.250  0.079  0.890  1.0
  Se  Se12  1  0.750  0.147  0.529  1.0
  Se  Se13  1  0.750  0.647  0.971  1.0
  Se  Se14  1  0.250  0.853  0.471  1.0
  Se  Se15  1  0.250  0.353  0.029  1.0
  Se  Se16  1  0.750  0.219  0.814  1.0
  Se  Se17  1  0.750  0.719  0.686  1.0
  Se  Se18  1  0.250  0.781  0.186  1.0
  Se  Se19  1  0.250  0.281  0.314  1.0
  Se  Se20  1  0.750  0.417  0.585  1.0
  Se  Se21  1  0.750  0.917  0.915  1.0
  Se  Se22  1  0.250  0.583  0.415  1.0
  Se  Se23  1  0.250  0.083  0.085  1.0
  Se  Se24  1  0.750  0.506  0.212  1.0
  Se  Se25  1  0.750  0.006  0.288  1.0
  Se  Se26  1  0.250  0.494  0.788  1.0
  Se  Se27  1  0.250  0.994  0.712  1.0
[/CIF]
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The compound described by Eu(BiSe2)2 crystallizes in the orthorhombic Pnma space group. Eu(1) is bonded in a 8-coordinate geometry to two equivalent Se(1), two equivalent Se(2), two equivalent Se(3), and two equivalent Se(4) atoms. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to one Se(2), two equivalent Se(4), and three equivalent Se(1) atoms to form a mixture of corner and edge-sharing BiSe6 octahedra. The corner-sharing octahedral tilt angles range from 48-70°. In the second Bi site, Bi(2) is bonded to one Se(4), two equivalent Se(2), and three equivalent Se(3) atoms to form a mixture of corner and edge-sharing BiSe6 octahedra. The corner-sharing octahedral tilt angles range from 48-70°. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded to two equivalent Eu(1) and three equivalent Bi(1) atoms to form a mixture of corner and edge-sharing SeEu2Bi3 square pyramids. In the second Se site, Se(2) is bonded to two equivalent Eu(1), one Bi(1), and two equivalent Bi(2) atoms to form a mixture of distorted corner and edge-sharing SeEu2Bi3 trigonal bipyramids. In the third Se site, Se(3) is bonded to two equivalent Eu(1) and three equivalent Bi(2) atoms to form a mixture of corner and edge-sharing SeEu2Bi3 trigonal bipyramids. In the fourth Se site, Se(4) is bonded to two equivalent Eu(1), one Bi(2), and two equivalent Bi(1) atoms to form a mixture of distorted corner and edge-sharing SeEu2Bi3 trigonal bipyramids. is represented by the CIF card [CIF]
data_Eu(BiSe2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.250
_cell_length_b   12.513
_cell_length_c   15.451
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   821.609
_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
  Eu  Eu0  1  0.750  0.254  0.162  1.0
  Eu  Eu1  1  0.750  0.754  0.338  1.0
  Eu  Eu2  1  0.250  0.746  0.838  1.0
  Eu  Eu3  1  0.250  0.246  0.662  1.0
  Bi  Bi4  1  0.750  0.429  0.900  1.0
  Bi  Bi5  1  0.750  0.929  0.600  1.0
  Bi  Bi6  1  0.250  0.571  0.100  1.0
  Bi  Bi7  1  0.250  0.071  0.400  1.0
  Bi  Bi8  1  0.750  0.421  0.390  1.0
  Bi  Bi9  1  0.750  0.921  0.110  1.0
  Bi  Bi10  1  0.250  0.579  0.610  1.0
  Bi  Bi11  1  0.250  0.079  0.890  1.0
  Se  Se12  1  0.750  0.147  0.529  1.0
  Se  Se13  1  0.750  0.647  0.971  1.0
  Se  Se14  1  0.250  0.853  0.471  1.0
  Se  Se15  1  0.250  0.353  0.029  1.0
  Se  Se16  1  0.750  0.219  0.814  1.0
  Se  Se17  1  0.750  0.719  0.686  1.0
  Se  Se18  1  0.250  0.781  0.186  1.0
  Se  Se19  1  0.250  0.281  0.314  1.0
  Se  Se20  1  0.750  0.417  0.585  1.0
  Se  Se21  1  0.750  0.917  0.915  1.0
  Se  Se22  1  0.250  0.583  0.415  1.0
  Se  Se23  1  0.250  0.083  0.085  1.0
  Se  Se24  1  0.750  0.506  0.212  1.0
  Se  Se25  1  0.750  0.006  0.288  1.0
  Se  Se26  1  0.250  0.494  0.788  1.0
  Se  Se27  1  0.250  0.994  0.712  1.0
[/CIF]
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