The crystal structure described by Rb2MgNd2(WO4)4 crystallizes in the monoclinic C2 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 9-coordinate geometry to one Mg(1), two equivalent O(2), two equivalent O(3), two equivalent O(7), and two equivalent O(8) atoms. In the second Rb site, Rb(2) is bonded in a 10-coordinate geometry to two equivalent O(2), two equivalent O(4), two equivalent O(5), two equivalent O(6), and two equivalent O(8) atoms. Mg(1) is bonded in a distorted see-saw-like geometry to one Rb(1), two equivalent O(1), and two equivalent O(5) atoms. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 6-coordinate geometry to two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms. In the second Nd site, Nd(2) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(3), and two equivalent O(7) atoms. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(2), one O(3), one O(5), one O(6), and one O(8) atom to form a mixture of distorted edge and corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 35-41°. In the second W site, W(2) is bonded to one O(1), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form a mixture of distorted edge and corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 35-41°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Nd(2), one W(1), and one W(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Rb(1), one Rb(2), one Nd(1), and one W(1) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Rb(1), one Nd(2), and one W(1) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one Rb(2), one Nd(1), and one W(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Rb(2), one Mg(1), one W(1), and one W(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Rb(2), one Nd(1), one W(1), and one W(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Rb(1), one Nd(2), and one W(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Rb(1), one Rb(2), one W(1), and one W(2) atom. is represented by the CIF file [CIF]
data_Rb2Nd2Mg(WO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.921
_cell_length_b   7.921
_cell_length_c   7.650
_cell_angle_alpha   62.872
_cell_angle_beta   62.872
_cell_angle_gamma   89.753
_symmetry_Int_Tables_number   1
_cell_volume   367.400
_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  0.880  0.120  0.750  1.0
  Rb  Rb1  1  0.197  0.803  0.250  1.0
  Nd  Nd2  1  0.219  0.781  0.750  1.0
  Nd  Nd3  1  0.761  0.239  0.250  1.0
  Mg  Mg4  1  0.621  0.379  0.750  1.0
  W  W5  1  0.678  0.721  0.794  1.0
  W  W6  1  0.691  0.702  0.293  1.0
  W  W7  1  0.298  0.309  0.207  1.0
  W  W8  1  0.279  0.322  0.706  1.0
  O  O9  1  0.595  0.379  0.495  1.0
  O  O10  1  0.224  0.056  0.795  1.0
  O  O11  1  0.047  0.380  0.865  1.0
  O  O12  1  0.346  0.075  0.370  1.0
  O  O13  1  0.755  0.652  0.541  1.0
  O  O14  1  0.348  0.245  0.959  1.0
  O  O15  1  0.620  0.953  0.635  1.0
  O  O16  1  0.407  0.632  0.533  1.0
  O  O17  1  0.036  0.247  0.301  1.0
  O  O18  1  0.753  0.964  0.199  1.0
  O  O19  1  0.368  0.593  0.967  1.0
  O  O20  1  0.925  0.654  0.130  1.0
  O  O21  1  0.257  0.385  0.424  1.0
  O  O22  1  0.615  0.743  0.076  1.0
  O  O23  1  0.944  0.776  0.705  1.0
  O  O24  1  0.621  0.405  0.005  1.0
[/CIF]
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The crystal structure described by Rb2MgNd2(WO4)4 crystallizes in the monoclinic C2 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 9-coordinate geometry to one Mg(1), two equivalent O(2), two equivalent O(3), two equivalent O(7), and two equivalent O(8) atoms. In the second Rb site, Rb(2) is bonded in a 10-coordinate geometry to two equivalent O(2), two equivalent O(4), two equivalent O(5), two equivalent O(6), and two equivalent O(8) atoms. Mg(1) is bonded in a distorted see-saw-like geometry to one Rb(1), two equivalent O(1), and two equivalent O(5) atoms. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 6-coordinate geometry to two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms. In the second Nd site, Nd(2) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(3), and two equivalent O(7) atoms. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(2), one O(3), one O(5), one O(6), and one O(8) atom to form a mixture of distorted edge and corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 35-41°. In the second W site, W(2) is bonded to one O(1), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form a mixture of distorted edge and corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 35-41°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Nd(2), one W(1), and one W(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Rb(1), one Rb(2), one Nd(1), and one W(1) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Rb(1), one Nd(2), and one W(1) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one Rb(2), one Nd(1), and one W(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Rb(2), one Mg(1), one W(1), and one W(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Rb(2), one Nd(1), one W(1), and one W(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Rb(1), one Nd(2), and one W(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Rb(1), one Rb(2), one W(1), and one W(2) atom. is represented by the CIF file [CIF]
data_Rb2Nd2Mg(WO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.921
_cell_length_b   7.921
_cell_length_c   7.650
_cell_angle_alpha   62.872
_cell_angle_beta   62.872
_cell_angle_gamma   89.753
_symmetry_Int_Tables_number   1
_cell_volume   367.400
_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  0.880  0.120  0.750  1.0
  Rb  Rb1  1  0.197  0.803  0.250  1.0
  Nd  Nd2  1  0.219  0.781  0.750  1.0
  Nd  Nd3  1  0.761  0.239  0.250  1.0
  Mg  Mg4  1  0.621  0.379  0.750  1.0
  W  W5  1  0.678  0.721  0.794  1.0
  W  W6  1  0.691  0.702  0.293  1.0
  W  W7  1  0.298  0.309  0.207  1.0
  W  W8  1  0.279  0.322  0.706  1.0
  O  O9  1  0.595  0.379  0.495  1.0
  O  O10  1  0.224  0.056  0.795  1.0
  O  O11  1  0.047  0.380  0.865  1.0
  O  O12  1  0.346  0.075  0.370  1.0
  O  O13  1  0.755  0.652  0.541  1.0
  O  O14  1  0.348  0.245  0.959  1.0
  O  O15  1  0.620  0.953  0.635  1.0
  O  O16  1  0.407  0.632  0.533  1.0
  O  O17  1  0.036  0.247  0.301  1.0
  O  O18  1  0.753  0.964  0.199  1.0
  O  O19  1  0.368  0.593  0.967  1.0
  O  O20  1  0.925  0.654  0.130  1.0
  O  O21  1  0.257  0.385  0.424  1.0
  O  O22  1  0.615  0.743  0.076  1.0
  O  O23  1  0.944  0.776  0.705  1.0
  O  O24  1  0.621  0.405  0.005  1.0
[/CIF]
.