The crystal structure described by Er11(In3Si2)2 crystallizes in the tetragonal I4/mmm space group. There are four inequivalent Er sites. In the first Er site, Er(1) is bonded to four equivalent In(1), one Si(1), one Si(2), and one Si(3) atom to form a mixture of distorted edge, corner, and face-sharing ErIn4Si3 pentagonal bipyramids. In the second Er site, Er(2) is bonded in a 7-coordinate geometry to two equivalent In(1), two equivalent In(2), one Si(3), and two equivalent Si(1) atoms. In the third Er site, Er(3) is bonded in a 7-coordinate geometry to one In(2), two equivalent In(1), two equivalent Si(1), and two equivalent Si(2) atoms. In the fourth Er site, Er(4) is bonded in a 9-coordinate geometry to four equivalent In(1), four equivalent In(2), and one Si(2) atom. There are two inequivalent In sites. In the first In site, In(1) is bonded in a 10-coordinate geometry to one Er(3), one Er(4), two equivalent Er(2), four equivalent Er(1), one In(1), and one In(2) atom. In the second In site, In(2) is bonded in a 11-coordinate geometry to one Er(3), two equivalent Er(4), four equivalent Er(2), two equivalent In(1), and two equivalent In(2) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 8-coordinate geometry to two equivalent Er(1), two equivalent Er(3), and four equivalent Er(2) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to one Er(4), four equivalent Er(1), and four equivalent Er(3) atoms. In the third Si site, Si(3) is bonded in a 8-coordinate geometry to four equivalent Er(1) and four equivalent Er(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Er11(In3Si2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.330
_cell_length_b   11.330
_cell_length_c   11.330
_cell_angle_alpha   120.035
_cell_angle_beta   120.035
_cell_angle_gamma   89.940
_symmetry_Int_Tables_number   1
_cell_volume   1027.881
_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
  Er  Er0  1  0.686  0.937  0.250  1.0
  Er  Er1  1  0.686  0.436  0.750  1.0
  Er  Er2  1  0.937  0.686  0.250  1.0
  Er  Er3  1  0.436  0.686  0.750  1.0
  Er  Er4  1  0.314  0.063  0.750  1.0
  Er  Er5  1  0.314  0.564  0.250  1.0
  Er  Er6  1  0.063  0.314  0.750  1.0
  Er  Er7  1  0.564  0.314  0.250  1.0
  Er  Er8  1  0.899  0.246  0.347  1.0
  Er  Er9  1  0.899  0.552  0.653  1.0
  Er  Er10  1  0.246  0.899  0.347  1.0
  Er  Er11  1  0.552  0.899  0.653  1.0
  Er  Er12  1  0.101  0.754  0.653  1.0
  Er  Er13  1  0.101  0.448  0.347  1.0
  Er  Er14  1  0.754  0.101  0.653  1.0
  Er  Er15  1  0.448  0.101  0.347  1.0
  Er  Er16  1  0.333  0.333  0.665  1.0
  Er  Er17  1  0.667  0.667  0.335  1.0
  Er  Er18  1  0.333  0.667  1.000  1.0
  Er  Er19  1  0.667  0.333  0.000  1.0
  Er  Er20  1  0.830  0.830  0.000  1.0
  Er  Er21  1  0.170  0.170  0.000  1.0
  In  In22  1  0.036  0.036  0.412  1.0
  In  In23  1  0.623  0.623  0.588  1.0
  In  In24  1  0.036  0.623  1.000  1.0
  In  In25  1  0.623  0.036  0.000  1.0
  In  In26  1  0.964  0.964  0.588  1.0
  In  In27  1  0.377  0.377  0.412  1.0
  In  In28  1  0.964  0.377  0.000  1.0
  In  In29  1  0.377  0.964  1.000  1.0
  In  In30  1  0.129  0.129  0.257  1.0
  In  In31  1  0.871  0.871  0.743  1.0
  In  In32  1  0.129  0.871  1.000  1.0
  In  In33  1  0.871  0.129  0.000  1.0
  Si  Si34  1  0.153  0.500  0.653  1.0
  Si  Si35  1  0.847  0.500  0.347  1.0
  Si  Si36  1  0.500  0.847  0.347  1.0
  Si  Si37  1  0.500  0.153  0.653  1.0
  Si  Si38  1  0.622  0.622  0.000  1.0
  Si  Si39  1  0.378  0.378  0.000  1.0
  Si  Si40  1  0.750  0.250  0.500  1.0
  Si  Si41  1  0.250  0.750  0.500  1.0
[/CIF]
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The crystal structure described by Er11(In3Si2)2 crystallizes in the tetragonal I4/mmm space group. There are four inequivalent Er sites. In the first Er site, Er(1) is bonded to four equivalent In(1), one Si(1), one Si(2), and one Si(3) atom to form a mixture of distorted edge, corner, and face-sharing ErIn4Si3 pentagonal bipyramids. In the second Er site, Er(2) is bonded in a 7-coordinate geometry to two equivalent In(1), two equivalent In(2), one Si(3), and two equivalent Si(1) atoms. In the third Er site, Er(3) is bonded in a 7-coordinate geometry to one In(2), two equivalent In(1), two equivalent Si(1), and two equivalent Si(2) atoms. In the fourth Er site, Er(4) is bonded in a 9-coordinate geometry to four equivalent In(1), four equivalent In(2), and one Si(2) atom. There are two inequivalent In sites. In the first In site, In(1) is bonded in a 10-coordinate geometry to one Er(3), one Er(4), two equivalent Er(2), four equivalent Er(1), one In(1), and one In(2) atom. In the second In site, In(2) is bonded in a 11-coordinate geometry to one Er(3), two equivalent Er(4), four equivalent Er(2), two equivalent In(1), and two equivalent In(2) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 8-coordinate geometry to two equivalent Er(1), two equivalent Er(3), and four equivalent Er(2) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to one Er(4), four equivalent Er(1), and four equivalent Er(3) atoms. In the third Si site, Si(3) is bonded in a 8-coordinate geometry to four equivalent Er(1) and four equivalent Er(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Er11(In3Si2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.330
_cell_length_b   11.330
_cell_length_c   11.330
_cell_angle_alpha   120.035
_cell_angle_beta   120.035
_cell_angle_gamma   89.940
_symmetry_Int_Tables_number   1
_cell_volume   1027.881
_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
  Er  Er0  1  0.686  0.937  0.250  1.0
  Er  Er1  1  0.686  0.436  0.750  1.0
  Er  Er2  1  0.937  0.686  0.250  1.0
  Er  Er3  1  0.436  0.686  0.750  1.0
  Er  Er4  1  0.314  0.063  0.750  1.0
  Er  Er5  1  0.314  0.564  0.250  1.0
  Er  Er6  1  0.063  0.314  0.750  1.0
  Er  Er7  1  0.564  0.314  0.250  1.0
  Er  Er8  1  0.899  0.246  0.347  1.0
  Er  Er9  1  0.899  0.552  0.653  1.0
  Er  Er10  1  0.246  0.899  0.347  1.0
  Er  Er11  1  0.552  0.899  0.653  1.0
  Er  Er12  1  0.101  0.754  0.653  1.0
  Er  Er13  1  0.101  0.448  0.347  1.0
  Er  Er14  1  0.754  0.101  0.653  1.0
  Er  Er15  1  0.448  0.101  0.347  1.0
  Er  Er16  1  0.333  0.333  0.665  1.0
  Er  Er17  1  0.667  0.667  0.335  1.0
  Er  Er18  1  0.333  0.667  1.000  1.0
  Er  Er19  1  0.667  0.333  0.000  1.0
  Er  Er20  1  0.830  0.830  0.000  1.0
  Er  Er21  1  0.170  0.170  0.000  1.0
  In  In22  1  0.036  0.036  0.412  1.0
  In  In23  1  0.623  0.623  0.588  1.0
  In  In24  1  0.036  0.623  1.000  1.0
  In  In25  1  0.623  0.036  0.000  1.0
  In  In26  1  0.964  0.964  0.588  1.0
  In  In27  1  0.377  0.377  0.412  1.0
  In  In28  1  0.964  0.377  0.000  1.0
  In  In29  1  0.377  0.964  1.000  1.0
  In  In30  1  0.129  0.129  0.257  1.0
  In  In31  1  0.871  0.871  0.743  1.0
  In  In32  1  0.129  0.871  1.000  1.0
  In  In33  1  0.871  0.129  0.000  1.0
  Si  Si34  1  0.153  0.500  0.653  1.0
  Si  Si35  1  0.847  0.500  0.347  1.0
  Si  Si36  1  0.500  0.847  0.347  1.0
  Si  Si37  1  0.500  0.153  0.653  1.0
  Si  Si38  1  0.622  0.622  0.000  1.0
  Si  Si39  1  0.378  0.378  0.000  1.0
  Si  Si40  1  0.750  0.250  0.500  1.0
  Si  Si41  1  0.250  0.750  0.500  1.0
[/CIF]
.