The crystal structure described by Er2Fe12P7 crystallizes in the monoclinic Pm space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 18-coordinate geometry to one Fe(1), one Fe(2), one Fe(3), one Fe(4), one Fe(5), one Fe(6), two equivalent Fe(7), two equivalent Fe(8), two equivalent Fe(9), two equivalent P(4), two equivalent P(5), and two equivalent P(6) atoms. In the second Er site, Er(2) is bonded in a 15-coordinate geometry to one Fe(7), one Fe(8), one Fe(9), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(3), two equivalent P(1), two equivalent P(2), and two equivalent P(3) atoms. There are twelve inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one Er(1), two equivalent Er(2), one P(1), one P(3), and two equivalent P(5) atoms to form distorted FeEr3P4 tetrahedra that share corners with two equivalent Fe(7)Er3P4 tetrahedra, corners with two equivalent Fe(8)Er3P4 tetrahedra, corners with two equivalent Fe(4)ErP4 tetrahedra, corners with two equivalent Fe(5)ErP4 tetrahedra, corners with three equivalent Fe(2)Er3P4 tetrahedra, corners with three equivalent Fe(3)Er3P4 tetrahedra,  an edgeedge with one Fe(6)ErP4 tetrahedra, edges with two equivalent Fe(1)Er3P4 tetrahedra, edges with two equivalent Fe(7)Er3P4 tetrahedra, edges with two equivalent Fe(8)Er3P4 tetrahedra,  a faceface with one Fe(2)Er3P4 tetrahedra,  a faceface with one Fe(3)Er3P4 tetrahedra,  a faceface with one Fe(5)ErP4 tetrahedra, and faces with two equivalent Fe(9)Er3P4 tetrahedra. In the second Fe site, Fe(2) is bonded to one Er(1), two equivalent Er(2), one P(1), one P(2), and two equivalent P(6) atoms to form distorted FeEr3P4 tetrahedra that share corners with two equivalent Fe(8)Er3P4 tetrahedra, corners with two equivalent Fe(9)Er3P4 tetrahedra, corners with two equivalent Fe(5)ErP4 tetrahedra, corners with two equivalent Fe(6)ErP4 tetrahedra, corners with three equivalent Fe(1)Er3P4 tetrahedra, corners with three equivalent Fe(3)Er3P4 tetrahedra,  an edgeedge with one Fe(4)ErP4 tetrahedra, edges with two equivalent Fe(2)Er3P4 tetrahedra, edges with two equivalent Fe(8)Er3P4 tetrahedra, edges with two equivalent Fe(9)Er3P4 tetrahedra,  a faceface with one Fe(1)Er3P4 tetrahedra,  a faceface with one Fe(3)Er3P4 tetrahedra,  a faceface with one Fe(6)ErP4 tetrahedra, and faces with two equivalent Fe(7)Er3P4 tetrahedra. In the third Fe site, Fe(3) is bonded to one Er(1), two equivalent Er(2), one P(2), one P(3), and two equivalent P(4) atoms to form distorted FeEr3P4 tetrahedra that share corners with two equivalent Fe(7)Er3P4 tetrahedra, corners with two equivalent Fe(9)Er3P4 tetrahedra, corners with two equivalent Fe(4)ErP4 tetrahedra, corners with two equivalent Fe(6)ErP4 tetrahedra, corners with three equivalent Fe(1)Er3P4 tetrahedra, corners with three equivalent Fe(2)Er3P4 tetrahedra,  an edgeedge with one Fe(5)ErP4 tetrahedra, edges with two equivalent Fe(3)Er3P4 tetrahedra, edges with two equivalent Fe(7)Er3P4 tetrahedra, edges with two equivalent Fe(9)Er3P4 tetrahedra,  a faceface with one Fe(1)Er3P4 tetrahedra,  a faceface with one Fe(2)Er3P4 tetrahedra,  a faceface with one Fe(4)ErP4 tetrahedra, and faces with two equivalent Fe(8)Er3P4 tetrahedra. In the fourth Fe site, Fe(4) is bonded to one Er(1), one P(1), one P(7), and two equivalent P(4) atoms to form distorted FeErP4 tetrahedra that share corners with two equivalent Fe(1)Er3P4 tetrahedra, corners with two equivalent Fe(3)Er3P4 tetrahedra, corners with two equivalent Fe(9)Er3P4 tetrahedra, corners with two equivalent Fe(4)ErP4 tetrahedra, corners with two equivalent Fe(5)ErP4 tetrahedra, corners with two equivalent Fe(6)ErP4 tetrahedra,  an edgeedge with one Fe(2)Er3P4 tetrahedra, edges with two equivalent Fe(8)Er3P4 tetrahedra,  a faceface with one Fe(3)Er3P4 tetrahedra, and faces with two equivalent Fe(7)Er3P4 tetrahedra. In the fifth Fe site, Fe(5) is bonded to one Er(1), one P(2), one P(7), and two equivalent P(5) atoms to form distorted FeErP4 tetrahedra that share corners with two equivalent Fe(1)Er3P4 tetrahedra, corners with two equivalent Fe(2)Er3P4 tetrahedra, corners with two equivalent Fe(7)Er3P4 tetrahedra, corners with two equivalent Fe(4)ErP4 tetrahedra, corners with two equivalent Fe(5)ErP4 tetrahedra, corners with two equivalent Fe(6)ErP4 tetrahedra,  an edgeedge with one Fe(3)Er3P4 tetrahedra, edges with two equivalent Fe(9)Er3P4 tetrahedra,  a faceface with one Fe(1)Er3P4 tetrahedra, and faces with two equivalent Fe(8)Er3P4 tetrahedra. In the sixth Fe site, Fe(6) is bonded to one Er(1), one P(3), one P(7), and two equivalent P(6) atoms to form distorted FeErP4 tetrahedra that share corners with two equivalent Fe(2)Er3P4 tetrahedra, corners with two equivalent Fe(3)Er3P4 tetrahedra, corners with two equivalent Fe(8)Er3P4 tetrahedra, corners with two equivalent Fe(4)ErP4 tetrahedra, corners with two equivalent Fe(5)ErP4 tetrahedra, corners with two equivalent Fe(6)ErP4 tetrahedra,  an edgeedge with one Fe(1)Er3P4 tetrahedra, edges with two equivalent Fe(7)Er3P4 tetrahedra,  a faceface with one Fe(2)Er3P4 tetrahedra, and faces with two equivalent Fe(9)Er3P4 tetrahedra. In the seventh Fe site, Fe(7) is bonded to one Er(2), two equivalent Er(1), one P(4), one P(6), and two equivalent P(1) atoms to form distorted FeEr3P4 tetrahedra that share corners with two equivalent Fe(1)Er3P4 tetrahedra, corners with two equivalent Fe(3)Er3P4 tetrahedra, corners with two equivalent Fe(5)ErP4 tetrahedra, corners with three equivalent Fe(8)Er3P4 tetrahedra, corners with three equivalent Fe(9)Er3P4 tetrahedra, edges with two equivalent Fe(1)Er3P4 tetrahedra, edges with two equivalent Fe(3)Er3P4 tetrahedra, edges with two equivalent Fe(7)Er3P4 tetrahedra, edges with two equivalent Fe(6)ErP4 tetrahedra,  a faceface with one Fe(8)Er3P4 tetrahedra,  a faceface with one Fe(9)Er3P4 tetrahedra, faces with two equivalent Fe(2)Er3P4 tetrahedra, and faces with two equivalent Fe(4)ErP4 tetrahedra. In the eighth Fe site, Fe(8) is bonded to one Er(2), two equivalent Er(1), one P(4), one P(5), and two equivalent P(2) atoms to form distorted FeEr3P4 tetrahedra that share corners with two equivalent Fe(1)Er3P4 tetrahedra, corners with two equivalent Fe(2)Er3P4 tetrahedra, corners with two equivalent Fe(6)ErP4 tetrahedra, corners with three equivalent Fe(7)Er3P4 tetrahedra, corners with three equivalent Fe(9)Er3P4 tetrahedra, edges with two equivalent Fe(1)Er3P4 tetrahedra, edges with two equivalent Fe(2)Er3P4 tetrahedra, edges with two equivalent Fe(8)Er3P4 tetrahedra, edges with two equivalent Fe(4)ErP4 tetrahedra,  a faceface with one Fe(7)Er3P4 tetrahedra,  a faceface with one Fe(9)Er3P4 tetrahedra, faces with two equivalent Fe(3)Er3P4 tetrahedra, and faces with two equivalent Fe(5)ErP4 tetrahedra. In the ninth Fe site, Fe(9) is bonded to one Er(2), two equivalent Er(1), one P(5), one P(6), and two equivalent P(3) atoms to form distorted FeEr3P4 tetrahedra that share corners with two equivalent Fe(2)Er3P4 tetrahedra, corners with two equivalent Fe(3)Er3P4 tetrahedra, corners with two equivalent Fe(4)ErP4 tetrahedra, corners with three equivalent Fe(7)Er3P4 tetrahedra, corners with three equivalent Fe(8)Er3P4 tetrahedra, edges with two equivalent Fe(2)Er3P4 tetrahedra, edges with two equivalent Fe(3)Er3P4 tetrahedra, edges with two equivalent Fe(9)Er3P4 tetrahedra, edges with two equivalent Fe(5)ErP4 tetrahedra,  a faceface with one Fe(7)Er3P4 tetrahedra,  a faceface with one Fe(8)Er3P4 tetrahedra, faces with two equivalent Fe(1)Er3P4 tetrahedra, and faces with two equivalent Fe(6)ErP4 tetrahedra. In the tenth Fe site, Fe(10) is bonded in a 5-coordinate geometry to one P(5), two equivalent P(1), and two equivalent P(7) atoms. In the eleventh Fe site, Fe(11) is bonded in a 5-coordinate geometry to one P(6), two equivalent P(2), and two equivalent P(7) atoms. In the twelfth Fe site, Fe(12) is bonded in a 5-coordinate geometry to one P(4), two equivalent P(3), and two equivalent P(7) atoms. There are seven inequivalent P sites. In the first P site, P(1) is bonded in a 9-coordinate geometry to two equivalent Er(2), one Fe(1), one Fe(2), one Fe(4), two equivalent Fe(10), and two equivalent Fe(7) atoms. In the second P site, P(2) is bonded in a 9-coordinate geometry to two equivalent Er(2), one Fe(2), one Fe(3), one Fe(5), two equivalent Fe(11), and two equivalent Fe(8) atoms. In the third P site, P(3) is bonded in a 9-coordinate geometry to two equivalent Er(2), one Fe(1), one Fe(3), one Fe(6), two equivalent Fe(12), and two equivalent Fe(9) atoms. In the fourth P site, P(4) is bonded in a 9-coordinate geometry to two equivalent Er(1), one Fe(12), one Fe(7), one Fe(8), two equivalent Fe(3), and two equivalent Fe(4) atoms. In the fifth P site, P(5) is bonded in a 9-coordinate geometry to two equivalent Er(1), one Fe(10), one Fe(8), one Fe(9), two equivalent Fe(1), and two equivalent Fe(5) atoms. In the sixth P site, P(6) is bonded in a 9-coordinate geometry to two equivalent Er(1), one Fe(11), one Fe(7), one Fe(9), two equivalent Fe(2), and two equivalent Fe(6) atoms. In the seventh P site, P(7) is bonded in a 9-coordinate geometry to one Fe(4), one Fe(5), one Fe(6), two equivalent Fe(10), two equivalent Fe(11), and two equivalent Fe(12) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Er2Fe12P7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.633
_cell_length_b   8.954
_cell_length_c   8.951
_cell_angle_alpha   120.060
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   252.030
_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
  Er  Er0  1  0.000  0.667  0.334  1.0
  Er  Er1  1  0.500  0.333  0.667  1.0
  Fe  Fe2  1  0.000  0.372  0.944  1.0
  Fe  Fe3  1  0.000  0.056  0.427  1.0
  Fe  Fe4  1  0.000  0.572  0.628  1.0
  Fe  Fe5  1  0.000  0.881  0.725  1.0
  Fe  Fe6  1  0.000  0.276  0.157  1.0
  Fe  Fe7  1  0.000  0.844  0.119  1.0
  Fe  Fe8  1  0.500  0.952  0.568  1.0
  Fe  Fe9  1  0.500  0.432  0.384  1.0
  Fe  Fe10  1  0.500  0.616  0.048  1.0
  Fe  Fe11  1  0.500  0.120  0.904  1.0
  Fe  Fe12  1  0.500  0.095  0.216  1.0
  Fe  Fe13  1  0.500  0.784  0.880  1.0
  P  P14  1  0.000  0.115  0.703  1.0
  P  P15  1  0.000  0.296  0.412  1.0
  P  P16  1  0.000  0.588  0.884  1.0
  P  P17  1  0.500  0.711  0.598  1.0
  P  P18  1  0.500  0.402  0.112  1.0
  P  P19  1  0.500  0.888  0.290  1.0
  P  P20  1  0.000  0.000  0.000  1.0
[/CIF]
.
The crystal structure described by Er2Fe12P7 crystallizes in the monoclinic Pm space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 18-coordinate geometry to one Fe(1), one Fe(2), one Fe(3), one Fe(4), one Fe(5), one Fe(6), two equivalent Fe(7), two equivalent Fe(8), two equivalent Fe(9), two equivalent P(4), two equivalent P(5), and two equivalent P(6) atoms. In the second Er site, Er(2) is bonded in a 15-coordinate geometry to one Fe(7), one Fe(8), one Fe(9), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(3), two equivalent P(1), two equivalent P(2), and two equivalent P(3) atoms. There are twelve inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one Er(1), two equivalent Er(2), one P(1), one P(3), and two equivalent P(5) atoms to form distorted FeEr3P4 tetrahedra that share corners with two equivalent Fe(7)Er3P4 tetrahedra, corners with two equivalent Fe(8)Er3P4 tetrahedra, corners with two equivalent Fe(4)ErP4 tetrahedra, corners with two equivalent Fe(5)ErP4 tetrahedra, corners with three equivalent Fe(2)Er3P4 tetrahedra, corners with three equivalent Fe(3)Er3P4 tetrahedra,  an edgeedge with one Fe(6)ErP4 tetrahedra, edges with two equivalent Fe(1)Er3P4 tetrahedra, edges with two equivalent Fe(7)Er3P4 tetrahedra, edges with two equivalent Fe(8)Er3P4 tetrahedra,  a faceface with one Fe(2)Er3P4 tetrahedra,  a faceface with one Fe(3)Er3P4 tetrahedra,  a faceface with one Fe(5)ErP4 tetrahedra, and faces with two equivalent Fe(9)Er3P4 tetrahedra. In the second Fe site, Fe(2) is bonded to one Er(1), two equivalent Er(2), one P(1), one P(2), and two equivalent P(6) atoms to form distorted FeEr3P4 tetrahedra that share corners with two equivalent Fe(8)Er3P4 tetrahedra, corners with two equivalent Fe(9)Er3P4 tetrahedra, corners with two equivalent Fe(5)ErP4 tetrahedra, corners with two equivalent Fe(6)ErP4 tetrahedra, corners with three equivalent Fe(1)Er3P4 tetrahedra, corners with three equivalent Fe(3)Er3P4 tetrahedra,  an edgeedge with one Fe(4)ErP4 tetrahedra, edges with two equivalent Fe(2)Er3P4 tetrahedra, edges with two equivalent Fe(8)Er3P4 tetrahedra, edges with two equivalent Fe(9)Er3P4 tetrahedra,  a faceface with one Fe(1)Er3P4 tetrahedra,  a faceface with one Fe(3)Er3P4 tetrahedra,  a faceface with one Fe(6)ErP4 tetrahedra, and faces with two equivalent Fe(7)Er3P4 tetrahedra. In the third Fe site, Fe(3) is bonded to one Er(1), two equivalent Er(2), one P(2), one P(3), and two equivalent P(4) atoms to form distorted FeEr3P4 tetrahedra that share corners with two equivalent Fe(7)Er3P4 tetrahedra, corners with two equivalent Fe(9)Er3P4 tetrahedra, corners with two equivalent Fe(4)ErP4 tetrahedra, corners with two equivalent Fe(6)ErP4 tetrahedra, corners with three equivalent Fe(1)Er3P4 tetrahedra, corners with three equivalent Fe(2)Er3P4 tetrahedra,  an edgeedge with one Fe(5)ErP4 tetrahedra, edges with two equivalent Fe(3)Er3P4 tetrahedra, edges with two equivalent Fe(7)Er3P4 tetrahedra, edges with two equivalent Fe(9)Er3P4 tetrahedra,  a faceface with one Fe(1)Er3P4 tetrahedra,  a faceface with one Fe(2)Er3P4 tetrahedra,  a faceface with one Fe(4)ErP4 tetrahedra, and faces with two equivalent Fe(8)Er3P4 tetrahedra. In the fourth Fe site, Fe(4) is bonded to one Er(1), one P(1), one P(7), and two equivalent P(4) atoms to form distorted FeErP4 tetrahedra that share corners with two equivalent Fe(1)Er3P4 tetrahedra, corners with two equivalent Fe(3)Er3P4 tetrahedra, corners with two equivalent Fe(9)Er3P4 tetrahedra, corners with two equivalent Fe(4)ErP4 tetrahedra, corners with two equivalent Fe(5)ErP4 tetrahedra, corners with two equivalent Fe(6)ErP4 tetrahedra,  an edgeedge with one Fe(2)Er3P4 tetrahedra, edges with two equivalent Fe(8)Er3P4 tetrahedra,  a faceface with one Fe(3)Er3P4 tetrahedra, and faces with two equivalent Fe(7)Er3P4 tetrahedra. In the fifth Fe site, Fe(5) is bonded to one Er(1), one P(2), one P(7), and two equivalent P(5) atoms to form distorted FeErP4 tetrahedra that share corners with two equivalent Fe(1)Er3P4 tetrahedra, corners with two equivalent Fe(2)Er3P4 tetrahedra, corners with two equivalent Fe(7)Er3P4 tetrahedra, corners with two equivalent Fe(4)ErP4 tetrahedra, corners with two equivalent Fe(5)ErP4 tetrahedra, corners with two equivalent Fe(6)ErP4 tetrahedra,  an edgeedge with one Fe(3)Er3P4 tetrahedra, edges with two equivalent Fe(9)Er3P4 tetrahedra,  a faceface with one Fe(1)Er3P4 tetrahedra, and faces with two equivalent Fe(8)Er3P4 tetrahedra. In the sixth Fe site, Fe(6) is bonded to one Er(1), one P(3), one P(7), and two equivalent P(6) atoms to form distorted FeErP4 tetrahedra that share corners with two equivalent Fe(2)Er3P4 tetrahedra, corners with two equivalent Fe(3)Er3P4 tetrahedra, corners with two equivalent Fe(8)Er3P4 tetrahedra, corners with two equivalent Fe(4)ErP4 tetrahedra, corners with two equivalent Fe(5)ErP4 tetrahedra, corners with two equivalent Fe(6)ErP4 tetrahedra,  an edgeedge with one Fe(1)Er3P4 tetrahedra, edges with two equivalent Fe(7)Er3P4 tetrahedra,  a faceface with one Fe(2)Er3P4 tetrahedra, and faces with two equivalent Fe(9)Er3P4 tetrahedra. In the seventh Fe site, Fe(7) is bonded to one Er(2), two equivalent Er(1), one P(4), one P(6), and two equivalent P(1) atoms to form distorted FeEr3P4 tetrahedra that share corners with two equivalent Fe(1)Er3P4 tetrahedra, corners with two equivalent Fe(3)Er3P4 tetrahedra, corners with two equivalent Fe(5)ErP4 tetrahedra, corners with three equivalent Fe(8)Er3P4 tetrahedra, corners with three equivalent Fe(9)Er3P4 tetrahedra, edges with two equivalent Fe(1)Er3P4 tetrahedra, edges with two equivalent Fe(3)Er3P4 tetrahedra, edges with two equivalent Fe(7)Er3P4 tetrahedra, edges with two equivalent Fe(6)ErP4 tetrahedra,  a faceface with one Fe(8)Er3P4 tetrahedra,  a faceface with one Fe(9)Er3P4 tetrahedra, faces with two equivalent Fe(2)Er3P4 tetrahedra, and faces with two equivalent Fe(4)ErP4 tetrahedra. In the eighth Fe site, Fe(8) is bonded to one Er(2), two equivalent Er(1), one P(4), one P(5), and two equivalent P(2) atoms to form distorted FeEr3P4 tetrahedra that share corners with two equivalent Fe(1)Er3P4 tetrahedra, corners with two equivalent Fe(2)Er3P4 tetrahedra, corners with two equivalent Fe(6)ErP4 tetrahedra, corners with three equivalent Fe(7)Er3P4 tetrahedra, corners with three equivalent Fe(9)Er3P4 tetrahedra, edges with two equivalent Fe(1)Er3P4 tetrahedra, edges with two equivalent Fe(2)Er3P4 tetrahedra, edges with two equivalent Fe(8)Er3P4 tetrahedra, edges with two equivalent Fe(4)ErP4 tetrahedra,  a faceface with one Fe(7)Er3P4 tetrahedra,  a faceface with one Fe(9)Er3P4 tetrahedra, faces with two equivalent Fe(3)Er3P4 tetrahedra, and faces with two equivalent Fe(5)ErP4 tetrahedra. In the ninth Fe site, Fe(9) is bonded to one Er(2), two equivalent Er(1), one P(5), one P(6), and two equivalent P(3) atoms to form distorted FeEr3P4 tetrahedra that share corners with two equivalent Fe(2)Er3P4 tetrahedra, corners with two equivalent Fe(3)Er3P4 tetrahedra, corners with two equivalent Fe(4)ErP4 tetrahedra, corners with three equivalent Fe(7)Er3P4 tetrahedra, corners with three equivalent Fe(8)Er3P4 tetrahedra, edges with two equivalent Fe(2)Er3P4 tetrahedra, edges with two equivalent Fe(3)Er3P4 tetrahedra, edges with two equivalent Fe(9)Er3P4 tetrahedra, edges with two equivalent Fe(5)ErP4 tetrahedra,  a faceface with one Fe(7)Er3P4 tetrahedra,  a faceface with one Fe(8)Er3P4 tetrahedra, faces with two equivalent Fe(1)Er3P4 tetrahedra, and faces with two equivalent Fe(6)ErP4 tetrahedra. In the tenth Fe site, Fe(10) is bonded in a 5-coordinate geometry to one P(5), two equivalent P(1), and two equivalent P(7) atoms. In the eleventh Fe site, Fe(11) is bonded in a 5-coordinate geometry to one P(6), two equivalent P(2), and two equivalent P(7) atoms. In the twelfth Fe site, Fe(12) is bonded in a 5-coordinate geometry to one P(4), two equivalent P(3), and two equivalent P(7) atoms. There are seven inequivalent P sites. In the first P site, P(1) is bonded in a 9-coordinate geometry to two equivalent Er(2), one Fe(1), one Fe(2), one Fe(4), two equivalent Fe(10), and two equivalent Fe(7) atoms. In the second P site, P(2) is bonded in a 9-coordinate geometry to two equivalent Er(2), one Fe(2), one Fe(3), one Fe(5), two equivalent Fe(11), and two equivalent Fe(8) atoms. In the third P site, P(3) is bonded in a 9-coordinate geometry to two equivalent Er(2), one Fe(1), one Fe(3), one Fe(6), two equivalent Fe(12), and two equivalent Fe(9) atoms. In the fourth P site, P(4) is bonded in a 9-coordinate geometry to two equivalent Er(1), one Fe(12), one Fe(7), one Fe(8), two equivalent Fe(3), and two equivalent Fe(4) atoms. In the fifth P site, P(5) is bonded in a 9-coordinate geometry to two equivalent Er(1), one Fe(10), one Fe(8), one Fe(9), two equivalent Fe(1), and two equivalent Fe(5) atoms. In the sixth P site, P(6) is bonded in a 9-coordinate geometry to two equivalent Er(1), one Fe(11), one Fe(7), one Fe(9), two equivalent Fe(2), and two equivalent Fe(6) atoms. In the seventh P site, P(7) is bonded in a 9-coordinate geometry to one Fe(4), one Fe(5), one Fe(6), two equivalent Fe(10), two equivalent Fe(11), and two equivalent Fe(12) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Er2Fe12P7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.633
_cell_length_b   8.954
_cell_length_c   8.951
_cell_angle_alpha   120.060
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   252.030
_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
  Er  Er0  1  0.000  0.667  0.334  1.0
  Er  Er1  1  0.500  0.333  0.667  1.0
  Fe  Fe2  1  0.000  0.372  0.944  1.0
  Fe  Fe3  1  0.000  0.056  0.427  1.0
  Fe  Fe4  1  0.000  0.572  0.628  1.0
  Fe  Fe5  1  0.000  0.881  0.725  1.0
  Fe  Fe6  1  0.000  0.276  0.157  1.0
  Fe  Fe7  1  0.000  0.844  0.119  1.0
  Fe  Fe8  1  0.500  0.952  0.568  1.0
  Fe  Fe9  1  0.500  0.432  0.384  1.0
  Fe  Fe10  1  0.500  0.616  0.048  1.0
  Fe  Fe11  1  0.500  0.120  0.904  1.0
  Fe  Fe12  1  0.500  0.095  0.216  1.0
  Fe  Fe13  1  0.500  0.784  0.880  1.0
  P  P14  1  0.000  0.115  0.703  1.0
  P  P15  1  0.000  0.296  0.412  1.0
  P  P16  1  0.000  0.588  0.884  1.0
  P  P17  1  0.500  0.711  0.598  1.0
  P  P18  1  0.500  0.402  0.112  1.0
  P  P19  1  0.500  0.888  0.290  1.0
  P  P20  1  0.000  0.000  0.000  1.0
[/CIF]
.