The material structure described by Er2.0Mo4O15 crystallizes in the monoclinic P2_1/c space group. Er(1) is bonded to one O(1), one O(2), one O(3), one O(5), one O(6), one O(7), and one O(8) atom to form ErO7 pentagonal bipyramids that share corners with two equivalent Mo(2)O5 tetrahedra, corners with four equivalent Mo(1)O4 tetrahedra, and  an edgeedge with one Mo(2)O5 tetrahedra. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one O(2), one O(3), one O(5), and one O(8) atom to form MoO4 tetrahedra that share corners with four equivalent Er(1)O7 pentagonal bipyramids and  a cornercorner with one Mo(2)O5 tetrahedra. In the second Mo site, Mo(2) is bonded to one O(1), one O(4), one O(6), one O(7), and one O(8) atom to form distorted MoO5 tetrahedra that share corners with two equivalent Er(1)O7 pentagonal bipyramids,  a cornercorner with one Mo(1)O4 tetrahedra,  a cornercorner with one Mo(2)O5 tetrahedra, and  an edgeedge with one Er(1)O7 pentagonal bipyramid. There are eight inequivalent O sites. In the first O site, O(7) is bonded in a distorted linear geometry to one Er(1) and one Mo(2) atom. In the second O site, O(8) is bonded in a 3-coordinate geometry to one Er(1), one Mo(1), and one Mo(2) atom. In the third O site, O(1) is bonded in a bent 150 degrees geometry to one Er(1) and one Mo(2) atom. In the fourth O site, O(2) is bonded in a linear geometry to one Er(1) and one Mo(1) atom. In the fifth O site, O(3) is bonded in a bent 150 degrees geometry to one Er(1) and one Mo(1) atom. In the sixth O site, O(4) is bonded in a linear geometry to two equivalent Mo(2) atoms. In the seventh O site, O(5) is bonded in a bent 150 degrees geometry to one Er(1) and one Mo(1) atom. In the eighth O site, O(6) is bonded in a bent 120 degrees geometry to one Er(1) and one Mo(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Er2Mo4O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.526
_cell_length_b   6.762
_cell_length_c   10.490
_cell_angle_alpha   74.790
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   652.035
_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  0.523  0.712  0.224  1.0
  Er  Er1  1  0.477  0.288  0.776  1.0
  Er  Er2  1  0.023  0.288  0.276  1.0
  Er  Er3  1  0.977  0.712  0.724  1.0
  Mo  Mo4  1  0.743  0.419  0.011  1.0
  Mo  Mo5  1  0.257  0.581  0.989  1.0
  Mo  Mo6  1  0.243  0.581  0.489  1.0
  Mo  Mo7  1  0.757  0.419  0.511  1.0
  Mo  Mo8  1  0.904  0.880  0.157  1.0
  Mo  Mo9  1  0.096  0.120  0.843  1.0
  Mo  Mo10  1  0.404  0.120  0.343  1.0
  Mo  Mo11  1  0.596  0.880  0.657  1.0
  O  O12  1  0.722  0.888  0.148  1.0
  O  O13  1  0.278  0.112  0.852  1.0
  O  O14  1  0.222  0.112  0.352  1.0
  O  O15  1  0.778  0.888  0.648  1.0
  O  O16  1  0.625  0.523  0.103  1.0
  O  O17  1  0.375  0.477  0.897  1.0
  O  O18  1  0.125  0.477  0.397  1.0
  O  O19  1  0.875  0.523  0.603  1.0
  O  O20  1  0.348  0.720  0.083  1.0
  O  O21  1  0.652  0.280  0.917  1.0
  O  O22  1  0.848  0.280  0.417  1.0
  O  O23  1  0.152  0.720  0.583  1.0
  O  O24  1  0.000  0.000  0.000  1.0
  O  O25  1  0.500  0.000  0.500  1.0
  O  O26  1  0.666  0.620  0.400  1.0
  O  O27  1  0.334  0.380  0.600  1.0
  O  O28  1  0.166  0.380  0.100  1.0
  O  O29  1  0.834  0.620  0.900  1.0
  O  O30  1  0.972  0.948  0.294  1.0
  O  O31  1  0.028  0.052  0.706  1.0
  O  O32  1  0.472  0.052  0.206  1.0
  O  O33  1  0.528  0.948  0.794  1.0
  O  O34  1  0.944  0.621  0.183  1.0
  O  O35  1  0.056  0.379  0.817  1.0
  O  O36  1  0.444  0.379  0.317  1.0
  O  O37  1  0.556  0.621  0.683  1.0
  O  O38  1  0.865  0.255  0.118  1.0
  O  O39  1  0.135  0.745  0.882  1.0
  O  O40  1  0.365  0.745  0.382  1.0
  O  O41  1  0.635  0.255  0.618  1.0
[/CIF]
.
The material structure described by Er2.0Mo4O15 crystallizes in the monoclinic P2_1/c space group. Er(1) is bonded to one O(1), one O(2), one O(3), one O(5), one O(6), one O(7), and one O(8) atom to form ErO7 pentagonal bipyramids that share corners with two equivalent Mo(2)O5 tetrahedra, corners with four equivalent Mo(1)O4 tetrahedra, and  an edgeedge with one Mo(2)O5 tetrahedra. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one O(2), one O(3), one O(5), and one O(8) atom to form MoO4 tetrahedra that share corners with four equivalent Er(1)O7 pentagonal bipyramids and  a cornercorner with one Mo(2)O5 tetrahedra. In the second Mo site, Mo(2) is bonded to one O(1), one O(4), one O(6), one O(7), and one O(8) atom to form distorted MoO5 tetrahedra that share corners with two equivalent Er(1)O7 pentagonal bipyramids,  a cornercorner with one Mo(1)O4 tetrahedra,  a cornercorner with one Mo(2)O5 tetrahedra, and  an edgeedge with one Er(1)O7 pentagonal bipyramid. There are eight inequivalent O sites. In the first O site, O(7) is bonded in a distorted linear geometry to one Er(1) and one Mo(2) atom. In the second O site, O(8) is bonded in a 3-coordinate geometry to one Er(1), one Mo(1), and one Mo(2) atom. In the third O site, O(1) is bonded in a bent 150 degrees geometry to one Er(1) and one Mo(2) atom. In the fourth O site, O(2) is bonded in a linear geometry to one Er(1) and one Mo(1) atom. In the fifth O site, O(3) is bonded in a bent 150 degrees geometry to one Er(1) and one Mo(1) atom. In the sixth O site, O(4) is bonded in a linear geometry to two equivalent Mo(2) atoms. In the seventh O site, O(5) is bonded in a bent 150 degrees geometry to one Er(1) and one Mo(1) atom. In the eighth O site, O(6) is bonded in a bent 120 degrees geometry to one Er(1) and one Mo(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Er2Mo4O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.526
_cell_length_b   6.762
_cell_length_c   10.490
_cell_angle_alpha   74.790
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   652.035
_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  0.523  0.712  0.224  1.0
  Er  Er1  1  0.477  0.288  0.776  1.0
  Er  Er2  1  0.023  0.288  0.276  1.0
  Er  Er3  1  0.977  0.712  0.724  1.0
  Mo  Mo4  1  0.743  0.419  0.011  1.0
  Mo  Mo5  1  0.257  0.581  0.989  1.0
  Mo  Mo6  1  0.243  0.581  0.489  1.0
  Mo  Mo7  1  0.757  0.419  0.511  1.0
  Mo  Mo8  1  0.904  0.880  0.157  1.0
  Mo  Mo9  1  0.096  0.120  0.843  1.0
  Mo  Mo10  1  0.404  0.120  0.343  1.0
  Mo  Mo11  1  0.596  0.880  0.657  1.0
  O  O12  1  0.722  0.888  0.148  1.0
  O  O13  1  0.278  0.112  0.852  1.0
  O  O14  1  0.222  0.112  0.352  1.0
  O  O15  1  0.778  0.888  0.648  1.0
  O  O16  1  0.625  0.523  0.103  1.0
  O  O17  1  0.375  0.477  0.897  1.0
  O  O18  1  0.125  0.477  0.397  1.0
  O  O19  1  0.875  0.523  0.603  1.0
  O  O20  1  0.348  0.720  0.083  1.0
  O  O21  1  0.652  0.280  0.917  1.0
  O  O22  1  0.848  0.280  0.417  1.0
  O  O23  1  0.152  0.720  0.583  1.0
  O  O24  1  0.000  0.000  0.000  1.0
  O  O25  1  0.500  0.000  0.500  1.0
  O  O26  1  0.666  0.620  0.400  1.0
  O  O27  1  0.334  0.380  0.600  1.0
  O  O28  1  0.166  0.380  0.100  1.0
  O  O29  1  0.834  0.620  0.900  1.0
  O  O30  1  0.972  0.948  0.294  1.0
  O  O31  1  0.028  0.052  0.706  1.0
  O  O32  1  0.472  0.052  0.206  1.0
  O  O33  1  0.528  0.948  0.794  1.0
  O  O34  1  0.944  0.621  0.183  1.0
  O  O35  1  0.056  0.379  0.817  1.0
  O  O36  1  0.444  0.379  0.317  1.0
  O  O37  1  0.556  0.621  0.683  1.0
  O  O38  1  0.865  0.255  0.118  1.0
  O  O39  1  0.135  0.745  0.882  1.0
  O  O40  1  0.365  0.745  0.382  1.0
  O  O41  1  0.635  0.255  0.618  1.0
[/CIF]
.