The crystal structure described by Er12Co7 crystallizes in the monoclinic P2_1/c space group. There are six inequivalent Er sites. In the first Er site, Er(1) is bonded in a 5-coordinate geometry to one Co(1), one Co(2), one Co(3), and two equivalent Co(4) atoms. In the second Er site, Er(2) is bonded in a 4-coordinate geometry to one Co(2), one Co(4), and two equivalent Co(3) atoms. In the third Er site, Er(3) is bonded in a 4-coordinate geometry to one Co(4), two equivalent Co(2), and two equivalent Co(3) atoms. In the fourth Er site, Er(4) is bonded in a 5-coordinate geometry to one Co(1), one Co(2), one Co(3), and two equivalent Co(4) atoms. In the fifth Er site, Er(5) is bonded to one Co(1), one Co(3), one Co(4), and two equivalent Co(2) atoms to form distorted corner-sharing ErCo5 tetrahedra. In the sixth Er site, Er(6) is bonded in a 5-coordinate geometry to one Co(1), one Co(3), one Co(4), and two equivalent Co(2) atoms. There are four inequivalent Co sites. In the first Co site, Co(4) is bonded in a 9-coordinate geometry to one Er(2), one Er(3), one Er(5), one Er(6), two equivalent Er(1), two equivalent Er(4), and one Co(2) atom. In the second Co site, Co(1) is bonded in a body-centered cubic geometry to two equivalent Er(1), two equivalent Er(4), two equivalent Er(5), and two equivalent Er(6) atoms. In the third Co site, Co(2) is bonded in a 10-coordinate geometry to one Er(1), one Er(2), one Er(4), two equivalent Er(3), two equivalent Er(5), two equivalent Er(6), and one Co(4) atom. In the fourth Co site, Co(3) is bonded in a 8-coordinate geometry to one Er(1), one Er(4), one Er(5), one Er(6), two equivalent Er(2), and two equivalent Er(3) atoms. is represented by the CIF card [CIF]
data_Er12Co7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.076
_cell_length_b   8.203
_cell_length_c   10.931
_cell_angle_alpha   55.043
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   814.048
_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  0.705  0.235  0.537  1.0
  Er  Er1  1  0.205  0.765  0.963  1.0
  Er  Er2  1  0.842  0.502  0.658  1.0
  Er  Er3  1  0.342  0.498  0.842  1.0
  Er  Er4  1  0.158  0.498  0.342  1.0
  Er  Er5  1  0.658  0.502  0.158  1.0
  Er  Er6  1  0.005  0.847  0.355  1.0
  Er  Er7  1  0.505  0.153  0.145  1.0
  Er  Er8  1  0.995  0.153  0.645  1.0
  Er  Er9  1  0.495  0.847  0.855  1.0
  Er  Er10  1  0.795  0.235  0.037  1.0
  Er  Er11  1  0.295  0.765  0.463  1.0
  Er  Er12  1  0.928  0.771  0.087  1.0
  Er  Er13  1  0.428  0.229  0.413  1.0
  Er  Er14  1  0.072  0.229  0.913  1.0
  Er  Er15  1  0.572  0.771  0.587  1.0
  Er  Er16  1  0.301  0.250  0.675  1.0
  Er  Er17  1  0.801  0.750  0.825  1.0
  Er  Er18  1  0.699  0.750  0.325  1.0
  Er  Er19  1  0.199  0.250  0.175  1.0
  Er  Er20  1  0.929  0.269  0.303  1.0
  Er  Er21  1  0.429  0.731  0.197  1.0
  Er  Er22  1  0.071  0.731  0.697  1.0
  Er  Er23  1  0.571  0.269  0.803  1.0
  Co  Co24  1  0.500  0.500  0.500  1.0
  Co  Co25  1  0.000  0.500  0.000  1.0
  Co  Co26  1  0.671  0.910  0.031  1.0
  Co  Co27  1  0.171  0.090  0.469  1.0
  Co  Co28  1  0.329  0.090  0.969  1.0
  Co  Co29  1  0.829  0.910  0.531  1.0
  Co  Co30  1  0.402  0.492  0.100  1.0
  Co  Co31  1  0.902  0.508  0.400  1.0
  Co  Co32  1  0.598  0.508  0.900  1.0
  Co  Co33  1  0.098  0.492  0.600  1.0
  Co  Co34  1  0.811  0.098  0.844  1.0
  Co  Co35  1  0.311  0.902  0.656  1.0
  Co  Co36  1  0.189  0.902  0.156  1.0
  Co  Co37  1  0.689  0.098  0.344  1.0
[/CIF]
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The crystal structure described by Er12Co7 crystallizes in the monoclinic P2_1/c space group. There are six inequivalent Er sites. In the first Er site, Er(1) is bonded in a 5-coordinate geometry to one Co(1), one Co(2), one Co(3), and two equivalent Co(4) atoms. In the second Er site, Er(2) is bonded in a 4-coordinate geometry to one Co(2), one Co(4), and two equivalent Co(3) atoms. In the third Er site, Er(3) is bonded in a 4-coordinate geometry to one Co(4), two equivalent Co(2), and two equivalent Co(3) atoms. In the fourth Er site, Er(4) is bonded in a 5-coordinate geometry to one Co(1), one Co(2), one Co(3), and two equivalent Co(4) atoms. In the fifth Er site, Er(5) is bonded to one Co(1), one Co(3), one Co(4), and two equivalent Co(2) atoms to form distorted corner-sharing ErCo5 tetrahedra. In the sixth Er site, Er(6) is bonded in a 5-coordinate geometry to one Co(1), one Co(3), one Co(4), and two equivalent Co(2) atoms. There are four inequivalent Co sites. In the first Co site, Co(4) is bonded in a 9-coordinate geometry to one Er(2), one Er(3), one Er(5), one Er(6), two equivalent Er(1), two equivalent Er(4), and one Co(2) atom. In the second Co site, Co(1) is bonded in a body-centered cubic geometry to two equivalent Er(1), two equivalent Er(4), two equivalent Er(5), and two equivalent Er(6) atoms. In the third Co site, Co(2) is bonded in a 10-coordinate geometry to one Er(1), one Er(2), one Er(4), two equivalent Er(3), two equivalent Er(5), two equivalent Er(6), and one Co(4) atom. In the fourth Co site, Co(3) is bonded in a 8-coordinate geometry to one Er(1), one Er(4), one Er(5), one Er(6), two equivalent Er(2), and two equivalent Er(3) atoms. is represented by the CIF card [CIF]
data_Er12Co7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.076
_cell_length_b   8.203
_cell_length_c   10.931
_cell_angle_alpha   55.043
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   814.048
_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  0.705  0.235  0.537  1.0
  Er  Er1  1  0.205  0.765  0.963  1.0
  Er  Er2  1  0.842  0.502  0.658  1.0
  Er  Er3  1  0.342  0.498  0.842  1.0
  Er  Er4  1  0.158  0.498  0.342  1.0
  Er  Er5  1  0.658  0.502  0.158  1.0
  Er  Er6  1  0.005  0.847  0.355  1.0
  Er  Er7  1  0.505  0.153  0.145  1.0
  Er  Er8  1  0.995  0.153  0.645  1.0
  Er  Er9  1  0.495  0.847  0.855  1.0
  Er  Er10  1  0.795  0.235  0.037  1.0
  Er  Er11  1  0.295  0.765  0.463  1.0
  Er  Er12  1  0.928  0.771  0.087  1.0
  Er  Er13  1  0.428  0.229  0.413  1.0
  Er  Er14  1  0.072  0.229  0.913  1.0
  Er  Er15  1  0.572  0.771  0.587  1.0
  Er  Er16  1  0.301  0.250  0.675  1.0
  Er  Er17  1  0.801  0.750  0.825  1.0
  Er  Er18  1  0.699  0.750  0.325  1.0
  Er  Er19  1  0.199  0.250  0.175  1.0
  Er  Er20  1  0.929  0.269  0.303  1.0
  Er  Er21  1  0.429  0.731  0.197  1.0
  Er  Er22  1  0.071  0.731  0.697  1.0
  Er  Er23  1  0.571  0.269  0.803  1.0
  Co  Co24  1  0.500  0.500  0.500  1.0
  Co  Co25  1  0.000  0.500  0.000  1.0
  Co  Co26  1  0.671  0.910  0.031  1.0
  Co  Co27  1  0.171  0.090  0.469  1.0
  Co  Co28  1  0.329  0.090  0.969  1.0
  Co  Co29  1  0.829  0.910  0.531  1.0
  Co  Co30  1  0.402  0.492  0.100  1.0
  Co  Co31  1  0.902  0.508  0.400  1.0
  Co  Co32  1  0.598  0.508  0.900  1.0
  Co  Co33  1  0.098  0.492  0.600  1.0
  Co  Co34  1  0.811  0.098  0.844  1.0
  Co  Co35  1  0.311  0.902  0.656  1.0
  Co  Co36  1  0.189  0.902  0.156  1.0
  Co  Co37  1  0.689  0.098  0.344  1.0
[/CIF]
.