The crystal structure described by Er4Y2Fe23 crystallizes in the orthorhombic Imm2 space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 12-coordinate geometry to one Fe(1), one Fe(2), one Fe(5), one Fe(6), two equivalent Fe(3), two equivalent Fe(7), and four equivalent Fe(8) atoms. In the second Er site, Er(2) is bonded in a 12-coordinate geometry to one Fe(10), one Fe(9), two equivalent Fe(2), two equivalent Fe(3), two equivalent Fe(6), two equivalent Fe(7), and two equivalent Fe(8) atoms. Y(1) is bonded in a 12-coordinate geometry to one Fe(10), one Fe(9), two equivalent Fe(1), two equivalent Fe(3), two equivalent Fe(5), two equivalent Fe(7), and two equivalent Fe(8) atoms. There are ten inequivalent Fe sites. In the first Fe site, Fe(10) is bonded to two equivalent Er(2), two equivalent Y(1), two equivalent Fe(1), two equivalent Fe(2), and four equivalent Fe(7) atoms to form FeY2Er2Fe8 cuboctahedra that share corners with four equivalent Fe(9)Y2Er2Fe8 cuboctahedra and faces with eight equivalent Fe(8)YEr3Fe8 cuboctahedra. In the second Fe site, Fe(1) is bonded in a distorted q6 geometry to one Er(1), two equivalent Y(1), one Fe(10), one Fe(2), one Fe(6), two equivalent Fe(3), two equivalent Fe(7), and two equivalent Fe(8) atoms. In the third Fe site, Fe(2) is bonded in a distorted q6 geometry to one Er(1), two equivalent Er(2), one Fe(1), one Fe(10), one Fe(5), two equivalent Fe(3), two equivalent Fe(7), and two equivalent Fe(8) atoms. In the fourth Fe site, Fe(3) is bonded in a distorted q6 geometry to one Er(1), one Er(2), one Y(1), one Fe(1), one Fe(2), one Fe(3), one Fe(5), one Fe(6), one Fe(7), one Fe(9), and two equivalent Fe(8) atoms. In the fifth Fe site, Fe(4) is bonded in a body-centered cubic geometry to two equivalent Fe(5), two equivalent Fe(6), and four equivalent Fe(7) atoms. In the sixth Fe site, Fe(5) is bonded in a 13-coordinate geometry to one Er(1), two equivalent Y(1), one Fe(2), one Fe(4), one Fe(5), one Fe(9), two equivalent Fe(3), two equivalent Fe(7), and two equivalent Fe(8) atoms. In the seventh Fe site, Fe(6) is bonded in a 13-coordinate geometry to one Er(1), two equivalent Er(2), one Fe(1), one Fe(4), one Fe(6), one Fe(9), two equivalent Fe(3), two equivalent Fe(7), and two equivalent Fe(8) atoms. In the eighth Fe site, Fe(7) is bonded in a 13-coordinate geometry to one Er(1), one Er(2), one Y(1), one Fe(1), one Fe(10), one Fe(2), one Fe(3), one Fe(4), one Fe(5), one Fe(6), one Fe(7), and two equivalent Fe(8) atoms. In the ninth Fe site, Fe(8) is bonded to one Er(2), two equivalent Er(1), one Y(1), one Fe(1), one Fe(2), one Fe(5), one Fe(6), two equivalent Fe(3), and two equivalent Fe(7) atoms to form FeYEr3Fe8 cuboctahedra that share corners with four equivalent Fe(8)YEr3Fe8 cuboctahedra, faces with two equivalent Fe(10)Y2Er2Fe8 cuboctahedra, faces with two equivalent Fe(9)Y2Er2Fe8 cuboctahedra, and faces with four equivalent Fe(8)YEr3Fe8 cuboctahedra. In the tenth Fe site, Fe(9) is bonded to two equivalent Er(2), two equivalent Y(1), two equivalent Fe(5), two equivalent Fe(6), and four equivalent Fe(3) atoms to form FeY2Er2Fe8 cuboctahedra that share corners with four equivalent Fe(10)Y2Er2Fe8 cuboctahedra and faces with eight equivalent Fe(8)YEr3Fe8 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Y2Er4Fe23
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.489
_cell_length_b   8.489
_cell_length_c   8.489
_cell_angle_alpha   90.087
_cell_angle_beta   59.949
_cell_angle_gamma   120.049
_symmetry_Int_Tables_number   1
_cell_volume   432.306
_cell_formula_units_Z   1
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
  Y  Y0  1  0.585  0.292  0.707  1.0
  Y  Y1  1  0.000  0.708  0.707  1.0
  Er  Er2  1  0.000  0.291  0.709  1.0
  Er  Er3  1  0.418  0.709  0.291  1.0
  Er  Er4  1  0.000  0.291  0.291  1.0
  Er  Er5  1  0.000  0.709  0.290  1.0
  Fe  Fe6  1  0.649  0.324  0.027  1.0
  Fe  Fe7  1  0.351  0.325  0.325  1.0
  Fe  Fe8  1  0.351  0.026  0.324  1.0
  Fe  Fe9  1  0.649  0.325  0.324  1.0
  Fe  Fe10  1  0.351  0.675  0.974  1.0
  Fe  Fe11  1  0.649  0.676  0.675  1.0
  Fe  Fe12  1  0.649  0.974  0.675  1.0
  Fe  Fe13  1  0.351  0.675  0.675  1.0
  Fe  Fe14  1  1.000  0.000  0.000  1.0
  Fe  Fe15  1  0.243  0.122  0.635  1.0
  Fe  Fe16  1  0.757  0.122  0.121  1.0
  Fe  Fe17  1  0.756  0.635  0.123  1.0
  Fe  Fe18  1  0.242  0.121  0.123  1.0
  Fe  Fe19  1  0.757  0.878  0.365  1.0
  Fe  Fe20  1  0.243  0.878  0.879  1.0
  Fe  Fe21  1  0.242  0.365  0.879  1.0
  Fe  Fe22  1  0.756  0.879  0.879  1.0
  Fe  Fe23  1  0.000  0.001  0.499  1.0
  Fe  Fe24  1  0.500  0.500  0.499  1.0
  Fe  Fe25  1  0.501  0.000  0.499  1.0
  Fe  Fe26  1  0.000  0.499  0.001  1.0
  Fe  Fe27  1  0.500  0.999  0.001  1.0
  Fe  Fe28  1  0.499  0.500  0.001  1.0
[/CIF]
.
The crystal structure described by Er4Y2Fe23 crystallizes in the orthorhombic Imm2 space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 12-coordinate geometry to one Fe(1), one Fe(2), one Fe(5), one Fe(6), two equivalent Fe(3), two equivalent Fe(7), and four equivalent Fe(8) atoms. In the second Er site, Er(2) is bonded in a 12-coordinate geometry to one Fe(10), one Fe(9), two equivalent Fe(2), two equivalent Fe(3), two equivalent Fe(6), two equivalent Fe(7), and two equivalent Fe(8) atoms. Y(1) is bonded in a 12-coordinate geometry to one Fe(10), one Fe(9), two equivalent Fe(1), two equivalent Fe(3), two equivalent Fe(5), two equivalent Fe(7), and two equivalent Fe(8) atoms. There are ten inequivalent Fe sites. In the first Fe site, Fe(10) is bonded to two equivalent Er(2), two equivalent Y(1), two equivalent Fe(1), two equivalent Fe(2), and four equivalent Fe(7) atoms to form FeY2Er2Fe8 cuboctahedra that share corners with four equivalent Fe(9)Y2Er2Fe8 cuboctahedra and faces with eight equivalent Fe(8)YEr3Fe8 cuboctahedra. In the second Fe site, Fe(1) is bonded in a distorted q6 geometry to one Er(1), two equivalent Y(1), one Fe(10), one Fe(2), one Fe(6), two equivalent Fe(3), two equivalent Fe(7), and two equivalent Fe(8) atoms. In the third Fe site, Fe(2) is bonded in a distorted q6 geometry to one Er(1), two equivalent Er(2), one Fe(1), one Fe(10), one Fe(5), two equivalent Fe(3), two equivalent Fe(7), and two equivalent Fe(8) atoms. In the fourth Fe site, Fe(3) is bonded in a distorted q6 geometry to one Er(1), one Er(2), one Y(1), one Fe(1), one Fe(2), one Fe(3), one Fe(5), one Fe(6), one Fe(7), one Fe(9), and two equivalent Fe(8) atoms. In the fifth Fe site, Fe(4) is bonded in a body-centered cubic geometry to two equivalent Fe(5), two equivalent Fe(6), and four equivalent Fe(7) atoms. In the sixth Fe site, Fe(5) is bonded in a 13-coordinate geometry to one Er(1), two equivalent Y(1), one Fe(2), one Fe(4), one Fe(5), one Fe(9), two equivalent Fe(3), two equivalent Fe(7), and two equivalent Fe(8) atoms. In the seventh Fe site, Fe(6) is bonded in a 13-coordinate geometry to one Er(1), two equivalent Er(2), one Fe(1), one Fe(4), one Fe(6), one Fe(9), two equivalent Fe(3), two equivalent Fe(7), and two equivalent Fe(8) atoms. In the eighth Fe site, Fe(7) is bonded in a 13-coordinate geometry to one Er(1), one Er(2), one Y(1), one Fe(1), one Fe(10), one Fe(2), one Fe(3), one Fe(4), one Fe(5), one Fe(6), one Fe(7), and two equivalent Fe(8) atoms. In the ninth Fe site, Fe(8) is bonded to one Er(2), two equivalent Er(1), one Y(1), one Fe(1), one Fe(2), one Fe(5), one Fe(6), two equivalent Fe(3), and two equivalent Fe(7) atoms to form FeYEr3Fe8 cuboctahedra that share corners with four equivalent Fe(8)YEr3Fe8 cuboctahedra, faces with two equivalent Fe(10)Y2Er2Fe8 cuboctahedra, faces with two equivalent Fe(9)Y2Er2Fe8 cuboctahedra, and faces with four equivalent Fe(8)YEr3Fe8 cuboctahedra. In the tenth Fe site, Fe(9) is bonded to two equivalent Er(2), two equivalent Y(1), two equivalent Fe(5), two equivalent Fe(6), and four equivalent Fe(3) atoms to form FeY2Er2Fe8 cuboctahedra that share corners with four equivalent Fe(10)Y2Er2Fe8 cuboctahedra and faces with eight equivalent Fe(8)YEr3Fe8 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Y2Er4Fe23
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.489
_cell_length_b   8.489
_cell_length_c   8.489
_cell_angle_alpha   90.087
_cell_angle_beta   59.949
_cell_angle_gamma   120.049
_symmetry_Int_Tables_number   1
_cell_volume   432.306
_cell_formula_units_Z   1
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
  Y  Y0  1  0.585  0.292  0.707  1.0
  Y  Y1  1  0.000  0.708  0.707  1.0
  Er  Er2  1  0.000  0.291  0.709  1.0
  Er  Er3  1  0.418  0.709  0.291  1.0
  Er  Er4  1  0.000  0.291  0.291  1.0
  Er  Er5  1  0.000  0.709  0.290  1.0
  Fe  Fe6  1  0.649  0.324  0.027  1.0
  Fe  Fe7  1  0.351  0.325  0.325  1.0
  Fe  Fe8  1  0.351  0.026  0.324  1.0
  Fe  Fe9  1  0.649  0.325  0.324  1.0
  Fe  Fe10  1  0.351  0.675  0.974  1.0
  Fe  Fe11  1  0.649  0.676  0.675  1.0
  Fe  Fe12  1  0.649  0.974  0.675  1.0
  Fe  Fe13  1  0.351  0.675  0.675  1.0
  Fe  Fe14  1  1.000  0.000  0.000  1.0
  Fe  Fe15  1  0.243  0.122  0.635  1.0
  Fe  Fe16  1  0.757  0.122  0.121  1.0
  Fe  Fe17  1  0.756  0.635  0.123  1.0
  Fe  Fe18  1  0.242  0.121  0.123  1.0
  Fe  Fe19  1  0.757  0.878  0.365  1.0
  Fe  Fe20  1  0.243  0.878  0.879  1.0
  Fe  Fe21  1  0.242  0.365  0.879  1.0
  Fe  Fe22  1  0.756  0.879  0.879  1.0
  Fe  Fe23  1  0.000  0.001  0.499  1.0
  Fe  Fe24  1  0.500  0.500  0.499  1.0
  Fe  Fe25  1  0.501  0.000  0.499  1.0
  Fe  Fe26  1  0.000  0.499  0.001  1.0
  Fe  Fe27  1  0.500  0.999  0.001  1.0
  Fe  Fe28  1  0.499  0.500  0.001  1.0
[/CIF]
.