The crystal structure described by ErMnFeO5 crystallizes in the orthorhombic Pbam space group. Er(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(3), and four equivalent O(2) atoms. Mn(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form MnO6 octahedra that share corners with four equivalent Fe(1)O5 square pyramids and edges with two equivalent Mn(1)O6 octahedra. Fe(1) is bonded to one O(4), two equivalent O(1), and two equivalent O(2) atoms to form FeO5 square pyramids that share corners with four equivalent Mn(1)O6 octahedra and  an edgeedge with one Fe(1)O5 square pyramid. The corner-sharing octahedral tilt angles range from 50-56°. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Er(1) and two equivalent Fe(1) atoms to form distorted OEr2Fe2 trigonal pyramids that share corners with eight equivalent O(2)Er2MnFe tetrahedra, corners with four equivalent O(3)Er2Mn2 trigonal pyramids, edges with two equivalent O(2)Er2MnFe tetrahedra, and edges with two equivalent O(1)Er2Fe2 trigonal pyramids. In the second O site, O(2) is bonded to two equivalent Er(1), one Mn(1), and one Fe(1) atom to form distorted OEr2MnFe tetrahedra that share corners with six equivalent O(2)Er2MnFe tetrahedra, corners with two equivalent O(3)Er2Mn2 trigonal pyramids, corners with four equivalent O(1)Er2Fe2 trigonal pyramids,  an edgeedge with one O(2)Er2MnFe tetrahedra,  an edgeedge with one O(1)Er2Fe2 trigonal pyramid, and edges with two equivalent O(3)Er2Mn2 trigonal pyramids. In the third O site, O(3) is bonded to two equivalent Er(1) and two equivalent Mn(1) atoms to form distorted OEr2Mn2 trigonal pyramids that share corners with four equivalent O(2)Er2MnFe tetrahedra, corners with two equivalent O(3)Er2Mn2 trigonal pyramids, corners with four equivalent O(1)Er2Fe2 trigonal pyramids, edges with four equivalent O(2)Er2MnFe tetrahedra, and  an edgeedge with one O(3)Er2Mn2 trigonal pyramid. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Mn(1) and one Fe(1) atom. is represented by the CIF file [CIF]
data_ErMnFeO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.778
_cell_length_b   7.303
_cell_length_c   8.579
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   362.022
_cell_formula_units_Z   4
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  0.500  0.366  0.331  1.0
  Er  Er1  1  0.500  0.634  0.669  1.0
  Er  Er2  1  0.500  0.134  0.831  1.0
  Er  Er3  1  0.500  0.866  0.169  1.0
  Mn  Mn4  1  0.252  0.000  0.500  1.0
  Mn  Mn5  1  0.748  0.000  0.500  1.0
  Mn  Mn6  1  0.748  0.500  0.000  1.0
  Mn  Mn7  1  0.252  0.500  0.000  1.0
  Fe  Fe8  1  0.000  0.107  0.146  1.0
  Fe  Fe9  1  0.000  0.893  0.854  1.0
  Fe  Fe10  1  0.000  0.393  0.646  1.0
  Fe  Fe11  1  0.000  0.607  0.354  1.0
  O  O12  1  0.236  0.000  0.000  1.0
  O  O13  1  0.764  0.000  0.000  1.0
  O  O14  1  0.764  0.500  0.500  1.0
  O  O15  1  0.236  0.500  0.500  1.0
  O  O16  1  0.261  0.108  0.295  1.0
  O  O17  1  0.739  0.892  0.705  1.0
  O  O18  1  0.261  0.892  0.705  1.0
  O  O19  1  0.739  0.392  0.795  1.0
  O  O20  1  0.739  0.108  0.295  1.0
  O  O21  1  0.261  0.608  0.205  1.0
  O  O22  1  0.739  0.608  0.205  1.0
  O  O23  1  0.261  0.392  0.795  1.0
  O  O24  1  0.500  0.337  0.058  1.0
  O  O25  1  0.500  0.663  0.942  1.0
  O  O26  1  0.500  0.163  0.558  1.0
  O  O27  1  0.500  0.837  0.442  1.0
  O  O28  1  0.000  0.350  0.070  1.0
  O  O29  1  0.000  0.650  0.930  1.0
  O  O30  1  0.000  0.150  0.570  1.0
  O  O31  1  0.000  0.850  0.430  1.0
[/CIF]
.
The crystal structure described by ErMnFeO5 crystallizes in the orthorhombic Pbam space group. Er(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(3), and four equivalent O(2) atoms. Mn(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form MnO6 octahedra that share corners with four equivalent Fe(1)O5 square pyramids and edges with two equivalent Mn(1)O6 octahedra. Fe(1) is bonded to one O(4), two equivalent O(1), and two equivalent O(2) atoms to form FeO5 square pyramids that share corners with four equivalent Mn(1)O6 octahedra and  an edgeedge with one Fe(1)O5 square pyramid. The corner-sharing octahedral tilt angles range from 50-56°. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Er(1) and two equivalent Fe(1) atoms to form distorted OEr2Fe2 trigonal pyramids that share corners with eight equivalent O(2)Er2MnFe tetrahedra, corners with four equivalent O(3)Er2Mn2 trigonal pyramids, edges with two equivalent O(2)Er2MnFe tetrahedra, and edges with two equivalent O(1)Er2Fe2 trigonal pyramids. In the second O site, O(2) is bonded to two equivalent Er(1), one Mn(1), and one Fe(1) atom to form distorted OEr2MnFe tetrahedra that share corners with six equivalent O(2)Er2MnFe tetrahedra, corners with two equivalent O(3)Er2Mn2 trigonal pyramids, corners with four equivalent O(1)Er2Fe2 trigonal pyramids,  an edgeedge with one O(2)Er2MnFe tetrahedra,  an edgeedge with one O(1)Er2Fe2 trigonal pyramid, and edges with two equivalent O(3)Er2Mn2 trigonal pyramids. In the third O site, O(3) is bonded to two equivalent Er(1) and two equivalent Mn(1) atoms to form distorted OEr2Mn2 trigonal pyramids that share corners with four equivalent O(2)Er2MnFe tetrahedra, corners with two equivalent O(3)Er2Mn2 trigonal pyramids, corners with four equivalent O(1)Er2Fe2 trigonal pyramids, edges with four equivalent O(2)Er2MnFe tetrahedra, and  an edgeedge with one O(3)Er2Mn2 trigonal pyramid. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Mn(1) and one Fe(1) atom. is represented by the CIF file [CIF]
data_ErMnFeO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.778
_cell_length_b   7.303
_cell_length_c   8.579
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   362.022
_cell_formula_units_Z   4
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  0.500  0.366  0.331  1.0
  Er  Er1  1  0.500  0.634  0.669  1.0
  Er  Er2  1  0.500  0.134  0.831  1.0
  Er  Er3  1  0.500  0.866  0.169  1.0
  Mn  Mn4  1  0.252  0.000  0.500  1.0
  Mn  Mn5  1  0.748  0.000  0.500  1.0
  Mn  Mn6  1  0.748  0.500  0.000  1.0
  Mn  Mn7  1  0.252  0.500  0.000  1.0
  Fe  Fe8  1  0.000  0.107  0.146  1.0
  Fe  Fe9  1  0.000  0.893  0.854  1.0
  Fe  Fe10  1  0.000  0.393  0.646  1.0
  Fe  Fe11  1  0.000  0.607  0.354  1.0
  O  O12  1  0.236  0.000  0.000  1.0
  O  O13  1  0.764  0.000  0.000  1.0
  O  O14  1  0.764  0.500  0.500  1.0
  O  O15  1  0.236  0.500  0.500  1.0
  O  O16  1  0.261  0.108  0.295  1.0
  O  O17  1  0.739  0.892  0.705  1.0
  O  O18  1  0.261  0.892  0.705  1.0
  O  O19  1  0.739  0.392  0.795  1.0
  O  O20  1  0.739  0.108  0.295  1.0
  O  O21  1  0.261  0.608  0.205  1.0
  O  O22  1  0.739  0.608  0.205  1.0
  O  O23  1  0.261  0.392  0.795  1.0
  O  O24  1  0.500  0.337  0.058  1.0
  O  O25  1  0.500  0.663  0.942  1.0
  O  O26  1  0.500  0.163  0.558  1.0
  O  O27  1  0.500  0.837  0.442  1.0
  O  O28  1  0.000  0.350  0.070  1.0
  O  O29  1  0.000  0.650  0.930  1.0
  O  O30  1  0.000  0.150  0.570  1.0
  O  O31  1  0.000  0.850  0.430  1.0
[/CIF]
.