The structure described by Rb8Hf(MoO4)6 crystallizes in the monoclinic C2/m space group. There are three inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 10-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms. In the second Rb site, Rb(2) is bonded in a 8-coordinate geometry to one O(3), two equivalent O(2), two equivalent O(5), and three equivalent O(1) atoms. In the third Rb site, Rb(3) is bonded in a 8-coordinate geometry to one O(6), one O(7), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. Hf(1) is bonded to two equivalent O(7) and four equivalent O(4) atoms to form HfO6 octahedra that share corners with two equivalent Mo(1)O4 tetrahedra and corners with four equivalent Mo(2)O4 tetrahedra. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one O(6), one O(7), and two equivalent O(5) atoms to form MoO4 tetrahedra that share  a cornercorner with one Hf(1)O6 octahedra. The corner-sharing octahedral tilt angles are 39°. In the second Mo site, Mo(2) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form MoO4 tetrahedra that share  a cornercorner with one Hf(1)O6 octahedra. The corner-sharing octahedral tilt angles are 36°. There are seven inequivalent O sites. In the first O site, O(2) is bonded in a 4-coordinate geometry to one Rb(1), two equivalent Rb(2), and one Mo(2) atom. In the second O site, O(3) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(2), one Rb(3), and one Mo(2) atom. In the third O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Rb(3), one Hf(1), and one Mo(2) atom. In the fourth O site, O(5) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(3), two equivalent Rb(2), and one Mo(1) atom. In the fifth O site, O(6) is bonded in a 2-coordinate geometry to one Rb(3), two equivalent Rb(1), and one Mo(1) atom. In the sixth O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Rb(3), one Hf(1), and one Mo(1) atom. In the seventh O site, O(1) is bonded in a distorted single-bond geometry to one Rb(1), three equivalent Rb(2), and one Mo(2) atom. is represented by the CIF card [CIF]
data_Rb8Hf(MoO4)6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.983
_cell_length_b   10.983
_cell_length_c   8.144
_cell_angle_alpha   81.477
_cell_angle_beta   81.477
_cell_angle_gamma   124.111
_symmetry_Int_Tables_number   1
_cell_volume   771.719
_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
  Rb  Rb0  1  0.665  0.335  0.500  1.0
  Rb  Rb1  1  0.335  0.665  0.500  1.0
  Rb  Rb2  1  0.481  0.134  0.110  1.0
  Rb  Rb3  1  0.519  0.866  0.890  1.0
  Rb  Rb4  1  0.866  0.519  0.890  1.0
  Rb  Rb5  1  0.134  0.481  0.110  1.0
  Rb  Rb6  1  0.787  0.787  0.645  1.0
  Rb  Rb7  1  0.213  0.213  0.355  1.0
  Hf  Hf8  1  0.000  0.000  0.000  1.0
  Mo  Mo9  1  0.617  0.617  0.205  1.0
  Mo  Mo10  1  0.383  0.383  0.795  1.0
  Mo  Mo11  1  0.742  0.052  0.285  1.0
  Mo  Mo12  1  0.258  0.948  0.715  1.0
  Mo  Mo13  1  0.948  0.258  0.715  1.0
  Mo  Mo14  1  0.052  0.742  0.285  1.0
  O  O15  1  0.237  0.783  0.227  1.0
  O  O16  1  0.763  0.217  0.773  1.0
  O  O17  1  0.217  0.763  0.773  1.0
  O  O18  1  0.783  0.237  0.227  1.0
  O  O19  1  0.588  0.933  0.202  1.0
  O  O20  1  0.412  0.067  0.798  1.0
  O  O21  1  0.067  0.412  0.798  1.0
  O  O22  1  0.933  0.588  0.202  1.0
  O  O23  1  0.682  0.972  0.514  1.0
  O  O24  1  0.318  0.028  0.486  1.0
  O  O25  1  0.028  0.318  0.486  1.0
  O  O26  1  0.972  0.682  0.514  1.0
  O  O27  1  0.912  0.061  0.188  1.0
  O  O28  1  0.088  0.939  0.812  1.0
  O  O29  1  0.939  0.088  0.812  1.0
  O  O30  1  0.061  0.912  0.188  1.0
  O  O31  1  0.445  0.594  0.190  1.0
  O  O32  1  0.555  0.406  0.810  1.0
  O  O33  1  0.406  0.555  0.810  1.0
  O  O34  1  0.594  0.445  0.190  1.0
  O  O35  1  0.650  0.650  0.405  1.0
  O  O36  1  0.350  0.350  0.595  1.0
  O  O37  1  0.789  0.789  0.032  1.0
  O  O38  1  0.211  0.211  0.968  1.0
[/CIF]
.
The structure described by Rb8Hf(MoO4)6 crystallizes in the monoclinic C2/m space group. There are three inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 10-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms. In the second Rb site, Rb(2) is bonded in a 8-coordinate geometry to one O(3), two equivalent O(2), two equivalent O(5), and three equivalent O(1) atoms. In the third Rb site, Rb(3) is bonded in a 8-coordinate geometry to one O(6), one O(7), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. Hf(1) is bonded to two equivalent O(7) and four equivalent O(4) atoms to form HfO6 octahedra that share corners with two equivalent Mo(1)O4 tetrahedra and corners with four equivalent Mo(2)O4 tetrahedra. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one O(6), one O(7), and two equivalent O(5) atoms to form MoO4 tetrahedra that share  a cornercorner with one Hf(1)O6 octahedra. The corner-sharing octahedral tilt angles are 39°. In the second Mo site, Mo(2) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form MoO4 tetrahedra that share  a cornercorner with one Hf(1)O6 octahedra. The corner-sharing octahedral tilt angles are 36°. There are seven inequivalent O sites. In the first O site, O(2) is bonded in a 4-coordinate geometry to one Rb(1), two equivalent Rb(2), and one Mo(2) atom. In the second O site, O(3) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(2), one Rb(3), and one Mo(2) atom. In the third O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Rb(3), one Hf(1), and one Mo(2) atom. In the fourth O site, O(5) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(3), two equivalent Rb(2), and one Mo(1) atom. In the fifth O site, O(6) is bonded in a 2-coordinate geometry to one Rb(3), two equivalent Rb(1), and one Mo(1) atom. In the sixth O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Rb(3), one Hf(1), and one Mo(1) atom. In the seventh O site, O(1) is bonded in a distorted single-bond geometry to one Rb(1), three equivalent Rb(2), and one Mo(2) atom. is represented by the CIF card [CIF]
data_Rb8Hf(MoO4)6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.983
_cell_length_b   10.983
_cell_length_c   8.144
_cell_angle_alpha   81.477
_cell_angle_beta   81.477
_cell_angle_gamma   124.111
_symmetry_Int_Tables_number   1
_cell_volume   771.719
_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
  Rb  Rb0  1  0.665  0.335  0.500  1.0
  Rb  Rb1  1  0.335  0.665  0.500  1.0
  Rb  Rb2  1  0.481  0.134  0.110  1.0
  Rb  Rb3  1  0.519  0.866  0.890  1.0
  Rb  Rb4  1  0.866  0.519  0.890  1.0
  Rb  Rb5  1  0.134  0.481  0.110  1.0
  Rb  Rb6  1  0.787  0.787  0.645  1.0
  Rb  Rb7  1  0.213  0.213  0.355  1.0
  Hf  Hf8  1  0.000  0.000  0.000  1.0
  Mo  Mo9  1  0.617  0.617  0.205  1.0
  Mo  Mo10  1  0.383  0.383  0.795  1.0
  Mo  Mo11  1  0.742  0.052  0.285  1.0
  Mo  Mo12  1  0.258  0.948  0.715  1.0
  Mo  Mo13  1  0.948  0.258  0.715  1.0
  Mo  Mo14  1  0.052  0.742  0.285  1.0
  O  O15  1  0.237  0.783  0.227  1.0
  O  O16  1  0.763  0.217  0.773  1.0
  O  O17  1  0.217  0.763  0.773  1.0
  O  O18  1  0.783  0.237  0.227  1.0
  O  O19  1  0.588  0.933  0.202  1.0
  O  O20  1  0.412  0.067  0.798  1.0
  O  O21  1  0.067  0.412  0.798  1.0
  O  O22  1  0.933  0.588  0.202  1.0
  O  O23  1  0.682  0.972  0.514  1.0
  O  O24  1  0.318  0.028  0.486  1.0
  O  O25  1  0.028  0.318  0.486  1.0
  O  O26  1  0.972  0.682  0.514  1.0
  O  O27  1  0.912  0.061  0.188  1.0
  O  O28  1  0.088  0.939  0.812  1.0
  O  O29  1  0.939  0.088  0.812  1.0
  O  O30  1  0.061  0.912  0.188  1.0
  O  O31  1  0.445  0.594  0.190  1.0
  O  O32  1  0.555  0.406  0.810  1.0
  O  O33  1  0.406  0.555  0.810  1.0
  O  O34  1  0.594  0.445  0.190  1.0
  O  O35  1  0.650  0.650  0.405  1.0
  O  O36  1  0.350  0.350  0.595  1.0
  O  O37  1  0.789  0.789  0.032  1.0
  O  O38  1  0.211  0.211  0.968  1.0
[/CIF]
.