The crystal structure described by Er11Sn10 crystallizes in the tetragonal I4/mmm space group. There are four inequivalent Er sites. In the first Er site, Er(1) is bonded to one Sn(1), one Sn(2), one Sn(4), and four equivalent Sn(5) atoms to form a mixture of distorted face, corner, and edge-sharing ErSn7 pentagonal bipyramids. In the second Er site, Er(2) is bonded in a 7-coordinate geometry to one Sn(3), two equivalent Sn(1), two equivalent Sn(2), and two equivalent Sn(5) atoms. In the third Er site, Er(3) is bonded in a 9-coordinate geometry to one Sn(2), four equivalent Sn(3), and four equivalent Sn(5) atoms. In the fourth Er site, Er(4) is bonded in a 7-coordinate geometry to one Sn(4), two equivalent Sn(1), two equivalent Sn(3), and two equivalent Sn(5) atoms. There are five inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 8-coordinate geometry to two equivalent Er(1), two equivalent Er(2), and four equivalent Er(4) atoms. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to one Er(3), four equivalent Er(1), and four equivalent Er(2) atoms. In the third Sn site, Sn(3) is bonded in a 11-coordinate geometry to one Er(2), two equivalent Er(3), four equivalent Er(4), two equivalent Sn(3), and two equivalent Sn(5) atoms. In the fourth Sn site, Sn(4) is bonded in a 8-coordinate geometry to four equivalent Er(1) and four equivalent Er(4) atoms. In the fifth Sn site, Sn(5) is bonded in a 10-coordinate geometry to one Er(2), one Er(3), two equivalent Er(4), four equivalent Er(1), one Sn(3), and one Sn(5) atom. is represented by the CIF card [CIF]
data_Er11Sn10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.389
_cell_length_b   11.389
_cell_length_c   11.609
_cell_angle_alpha   119.375
_cell_angle_beta   119.364
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1084.655
_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  0.937  0.189  0.377  1.0
  Er  Er1  1  0.440  0.189  0.377  1.0
  Er  Er2  1  0.189  0.440  0.377  1.0
  Er  Er3  1  0.189  0.937  0.377  1.0
  Er  Er4  1  0.063  0.811  0.623  1.0
  Er  Er5  1  0.560  0.811  0.623  1.0
  Er  Er6  1  0.811  0.560  0.623  1.0
  Er  Er7  1  0.811  0.063  0.623  1.0
  Er  Er8  1  0.826  0.173  1.000  1.0
  Er  Er9  1  0.174  0.827  0.000  1.0
  Er  Er10  1  0.174  0.174  0.000  1.0
  Er  Er11  1  0.826  0.826  1.000  1.0
  Er  Er12  1  0.334  0.334  0.668  1.0
  Er  Er13  1  0.666  0.666  0.332  1.0
  Er  Er14  1  0.066  0.398  0.796  1.0
  Er  Er15  1  0.729  0.398  0.796  1.0
  Er  Er16  1  0.398  0.729  0.796  1.0
  Er  Er17  1  0.398  0.066  0.796  1.0
  Er  Er18  1  0.934  0.602  0.204  1.0
  Er  Er19  1  0.271  0.602  0.204  1.0
  Er  Er20  1  0.602  0.271  0.204  1.0
  Er  Er21  1  0.602  0.934  0.204  1.0
  Sn  Sn22  1  0.000  0.355  0.000  1.0
  Sn  Sn23  1  0.000  0.645  0.000  1.0
  Sn  Sn24  1  0.355  0.000  0.000  1.0
  Sn  Sn25  1  0.645  1.000  1.000  1.0
  Sn  Sn26  1  0.113  0.113  0.226  1.0
  Sn  Sn27  1  0.887  0.887  0.774  1.0
  Sn  Sn28  1  0.630  0.370  0.000  1.0
  Sn  Sn29  1  0.370  0.630  1.000  1.0
  Sn  Sn30  1  0.370  0.370  1.000  1.0
  Sn  Sn31  1  0.630  0.630  0.000  1.0
  Sn  Sn32  1  0.750  0.250  0.500  1.0
  Sn  Sn33  1  0.250  0.750  0.500  1.0
  Sn  Sn34  1  0.118  0.530  0.649  1.0
  Sn  Sn35  1  0.530  0.118  0.649  1.0
  Sn  Sn36  1  0.530  0.530  0.649  1.0
  Sn  Sn37  1  0.118  0.118  0.649  1.0
  Sn  Sn38  1  0.882  0.470  0.351  1.0
  Sn  Sn39  1  0.470  0.882  0.351  1.0
  Sn  Sn40  1  0.470  0.470  0.351  1.0
  Sn  Sn41  1  0.882  0.882  0.351  1.0
[/CIF]
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The crystal structure described by Er11Sn10 crystallizes in the tetragonal I4/mmm space group. There are four inequivalent Er sites. In the first Er site, Er(1) is bonded to one Sn(1), one Sn(2), one Sn(4), and four equivalent Sn(5) atoms to form a mixture of distorted face, corner, and edge-sharing ErSn7 pentagonal bipyramids. In the second Er site, Er(2) is bonded in a 7-coordinate geometry to one Sn(3), two equivalent Sn(1), two equivalent Sn(2), and two equivalent Sn(5) atoms. In the third Er site, Er(3) is bonded in a 9-coordinate geometry to one Sn(2), four equivalent Sn(3), and four equivalent Sn(5) atoms. In the fourth Er site, Er(4) is bonded in a 7-coordinate geometry to one Sn(4), two equivalent Sn(1), two equivalent Sn(3), and two equivalent Sn(5) atoms. There are five inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 8-coordinate geometry to two equivalent Er(1), two equivalent Er(2), and four equivalent Er(4) atoms. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to one Er(3), four equivalent Er(1), and four equivalent Er(2) atoms. In the third Sn site, Sn(3) is bonded in a 11-coordinate geometry to one Er(2), two equivalent Er(3), four equivalent Er(4), two equivalent Sn(3), and two equivalent Sn(5) atoms. In the fourth Sn site, Sn(4) is bonded in a 8-coordinate geometry to four equivalent Er(1) and four equivalent Er(4) atoms. In the fifth Sn site, Sn(5) is bonded in a 10-coordinate geometry to one Er(2), one Er(3), two equivalent Er(4), four equivalent Er(1), one Sn(3), and one Sn(5) atom. is represented by the CIF card [CIF]
data_Er11Sn10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.389
_cell_length_b   11.389
_cell_length_c   11.609
_cell_angle_alpha   119.375
_cell_angle_beta   119.364
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1084.655
_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  0.937  0.189  0.377  1.0
  Er  Er1  1  0.440  0.189  0.377  1.0
  Er  Er2  1  0.189  0.440  0.377  1.0
  Er  Er3  1  0.189  0.937  0.377  1.0
  Er  Er4  1  0.063  0.811  0.623  1.0
  Er  Er5  1  0.560  0.811  0.623  1.0
  Er  Er6  1  0.811  0.560  0.623  1.0
  Er  Er7  1  0.811  0.063  0.623  1.0
  Er  Er8  1  0.826  0.173  1.000  1.0
  Er  Er9  1  0.174  0.827  0.000  1.0
  Er  Er10  1  0.174  0.174  0.000  1.0
  Er  Er11  1  0.826  0.826  1.000  1.0
  Er  Er12  1  0.334  0.334  0.668  1.0
  Er  Er13  1  0.666  0.666  0.332  1.0
  Er  Er14  1  0.066  0.398  0.796  1.0
  Er  Er15  1  0.729  0.398  0.796  1.0
  Er  Er16  1  0.398  0.729  0.796  1.0
  Er  Er17  1  0.398  0.066  0.796  1.0
  Er  Er18  1  0.934  0.602  0.204  1.0
  Er  Er19  1  0.271  0.602  0.204  1.0
  Er  Er20  1  0.602  0.271  0.204  1.0
  Er  Er21  1  0.602  0.934  0.204  1.0
  Sn  Sn22  1  0.000  0.355  0.000  1.0
  Sn  Sn23  1  0.000  0.645  0.000  1.0
  Sn  Sn24  1  0.355  0.000  0.000  1.0
  Sn  Sn25  1  0.645  1.000  1.000  1.0
  Sn  Sn26  1  0.113  0.113  0.226  1.0
  Sn  Sn27  1  0.887  0.887  0.774  1.0
  Sn  Sn28  1  0.630  0.370  0.000  1.0
  Sn  Sn29  1  0.370  0.630  1.000  1.0
  Sn  Sn30  1  0.370  0.370  1.000  1.0
  Sn  Sn31  1  0.630  0.630  0.000  1.0
  Sn  Sn32  1  0.750  0.250  0.500  1.0
  Sn  Sn33  1  0.250  0.750  0.500  1.0
  Sn  Sn34  1  0.118  0.530  0.649  1.0
  Sn  Sn35  1  0.530  0.118  0.649  1.0
  Sn  Sn36  1  0.530  0.530  0.649  1.0
  Sn  Sn37  1  0.118  0.118  0.649  1.0
  Sn  Sn38  1  0.882  0.470  0.351  1.0
  Sn  Sn39  1  0.470  0.882  0.351  1.0
  Sn  Sn40  1  0.470  0.470  0.351  1.0
  Sn  Sn41  1  0.882  0.882  0.351  1.0
[/CIF]
.