The material described by Rb2MgNd2(WO4)4 is Pb (Zr_0.50 Ti_0.48) O_3-derived structured and crystallizes in the triclinic P1 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(13), one O(16), one O(3), one O(5), one O(6), one O(7), and one O(9) atom. In the second Rb site, Rb(2) is bonded in a 10-coordinate geometry to one O(11), one O(12), one O(13), one O(14), one O(15), one O(2), one O(4), one O(5), one O(6), and one O(8) atom. Mg(1) is bonded to one O(11), one O(12), one O(3), and one O(9) atom to form distorted MgO4 trigonal pyramids that share  a cornercorner with one W(1)O6 octahedra,  a cornercorner with one W(2)O6 octahedra,  a cornercorner with one W(4)O6 octahedra, and  an edgeedge with one W(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 15-74°. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 7-coordinate geometry to one O(11), one O(12), one O(15), one O(2), one O(4), one O(7), and one O(8) atom. In the second Nd site, Nd(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(16), one O(3), one O(4), one O(7), and one O(9) atom. There are four inequivalent W sites. In the first W site, W(1) is bonded to one O(11), one O(14), one O(15), one O(16), one O(5), and one O(7) atom to form WO6 octahedra that share corners with two equivalent W(2)O6 octahedra,  a cornercorner with one Mg(1)O4 trigonal pyramid, and  an edgeedge with one W(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-39°. In the second W site, W(2) is bonded to one O(1), one O(10), one O(12), one O(14), one O(5), and one O(8) atom to form WO6 octahedra that share corners with two equivalent W(1)O6 octahedra,  a cornercorner with one Mg(1)O4 trigonal pyramid, and  an edgeedge with one W(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-39°. In the third W site, W(3) is bonded to one O(11), one O(13), one O(16), one O(4), one O(6), and one O(9) atom to form WO6 octahedra that share corners with two equivalent W(4)O6 octahedra,  an edgeedge with one W(1)O6 octahedra, and  an edgeedge with one Mg(1)O4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 35-40°. In the fourth W site, W(4) is bonded to one O(1), one O(13), one O(2), one O(3), one O(6), and one O(8) atom to form WO6 octahedra that share corners with two equivalent W(3)O6 octahedra,  a cornercorner with one Mg(1)O4 trigonal pyramid, and  an edgeedge with one W(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 35-40°. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Rb(1), one Nd(2), one W(2), and one W(4) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Rb(2), one Nd(1), and one W(4) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Rb(1), one Mg(1), one Nd(2), and one W(4) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Rb(2), one Nd(1), one Nd(2), and one W(3) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Rb(1), one Rb(2), one W(1), and one W(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Rb(1), one Rb(2), one W(3), and one W(4) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Rb(1), one Nd(1), one Nd(2), and one W(1) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Rb(2), one Nd(1), one W(2), and one W(4) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Rb(1), one Mg(1), one Nd(2), and one W(3) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Rb(1), one Nd(2), and one W(2) atom. In the eleventh O site, O(11) is bonded in a 5-coordinate geometry to one Rb(2), one Mg(1), one Nd(1), one W(1), and one W(3) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Rb(2), one Mg(1), one Nd(1), and one W(2) atom. In the thirteenth O site, O(13) is bonded in a 2-coordinate geometry to one Rb(1), one Rb(2), one W(3), and one W(4) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to one Rb(2), one W(1), and one W(2) atom. In the fifteenth O site, O(15) is bonded in a 3-coordinate geometry to one Rb(2), one Nd(1), and one W(1) atom. In the sixteenth O site, O(16) is bonded in a 4-coordinate geometry to one Rb(1), one Nd(2), one W(1), and one W(3) atom. is represented by the CIF file [CIF]
data_Rb2Nd2Mg(WO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.606
_cell_length_b   8.366
_cell_length_c   7.543
_cell_angle_alpha   64.373
_cell_angle_beta   61.227
_cell_angle_gamma   87.710
_symmetry_Int_Tables_number   1
_cell_volume   370.634
_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  0.797  0.206  0.752  1.0
  Rb  Rb1  1  0.210  0.803  0.239  1.0
  Nd  Nd2  1  0.259  0.840  0.702  1.0
  Nd  Nd3  1  0.739  0.162  0.287  1.0
  Mg  Mg4  1  0.077  0.472  0.055  1.0
  W  W5  1  0.687  0.687  0.802  1.0
  W  W6  1  0.690  0.676  0.305  1.0
  W  W7  1  0.334  0.317  0.203  1.0
  W  W8  1  0.314  0.324  0.703  1.0
  O  O9  1  0.609  0.386  0.452  1.0
  O  O10  1  0.262  0.082  0.781  1.0
  O  O11  1  0.044  0.340  0.901  1.0
  O  O12  1  0.400  0.081  0.345  1.0
  O  O13  1  0.746  0.620  0.568  1.0
  O  O14  1  0.386  0.275  0.927  1.0
  O  O15  1  0.610  0.904  0.655  1.0
  O  O16  1  0.382  0.606  0.559  1.0
  O  O17  1  0.034  0.242  0.309  1.0
  O  O18  1  0.754  0.922  0.210  1.0
  O  O19  1  0.354  0.580  0.972  1.0
  O  O20  1  0.972  0.675  0.083  1.0
  O  O21  1  0.248  0.368  0.452  1.0
  O  O22  1  0.611  0.719  0.070  1.0
  O  O23  1  0.960  0.772  0.680  1.0
  O  O24  1  0.641  0.417  0.023  1.0
[/CIF]
.
The material described by Rb2MgNd2(WO4)4 is Pb (Zr_0.50 Ti_0.48) O_3-derived structured and crystallizes in the triclinic P1 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(13), one O(16), one O(3), one O(5), one O(6), one O(7), and one O(9) atom. In the second Rb site, Rb(2) is bonded in a 10-coordinate geometry to one O(11), one O(12), one O(13), one O(14), one O(15), one O(2), one O(4), one O(5), one O(6), and one O(8) atom. Mg(1) is bonded to one O(11), one O(12), one O(3), and one O(9) atom to form distorted MgO4 trigonal pyramids that share  a cornercorner with one W(1)O6 octahedra,  a cornercorner with one W(2)O6 octahedra,  a cornercorner with one W(4)O6 octahedra, and  an edgeedge with one W(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 15-74°. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 7-coordinate geometry to one O(11), one O(12), one O(15), one O(2), one O(4), one O(7), and one O(8) atom. In the second Nd site, Nd(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(16), one O(3), one O(4), one O(7), and one O(9) atom. There are four inequivalent W sites. In the first W site, W(1) is bonded to one O(11), one O(14), one O(15), one O(16), one O(5), and one O(7) atom to form WO6 octahedra that share corners with two equivalent W(2)O6 octahedra,  a cornercorner with one Mg(1)O4 trigonal pyramid, and  an edgeedge with one W(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-39°. In the second W site, W(2) is bonded to one O(1), one O(10), one O(12), one O(14), one O(5), and one O(8) atom to form WO6 octahedra that share corners with two equivalent W(1)O6 octahedra,  a cornercorner with one Mg(1)O4 trigonal pyramid, and  an edgeedge with one W(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-39°. In the third W site, W(3) is bonded to one O(11), one O(13), one O(16), one O(4), one O(6), and one O(9) atom to form WO6 octahedra that share corners with two equivalent W(4)O6 octahedra,  an edgeedge with one W(1)O6 octahedra, and  an edgeedge with one Mg(1)O4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 35-40°. In the fourth W site, W(4) is bonded to one O(1), one O(13), one O(2), one O(3), one O(6), and one O(8) atom to form WO6 octahedra that share corners with two equivalent W(3)O6 octahedra,  a cornercorner with one Mg(1)O4 trigonal pyramid, and  an edgeedge with one W(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 35-40°. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Rb(1), one Nd(2), one W(2), and one W(4) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Rb(2), one Nd(1), and one W(4) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Rb(1), one Mg(1), one Nd(2), and one W(4) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Rb(2), one Nd(1), one Nd(2), and one W(3) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Rb(1), one Rb(2), one W(1), and one W(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Rb(1), one Rb(2), one W(3), and one W(4) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Rb(1), one Nd(1), one Nd(2), and one W(1) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Rb(2), one Nd(1), one W(2), and one W(4) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Rb(1), one Mg(1), one Nd(2), and one W(3) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Rb(1), one Nd(2), and one W(2) atom. In the eleventh O site, O(11) is bonded in a 5-coordinate geometry to one Rb(2), one Mg(1), one Nd(1), one W(1), and one W(3) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Rb(2), one Mg(1), one Nd(1), and one W(2) atom. In the thirteenth O site, O(13) is bonded in a 2-coordinate geometry to one Rb(1), one Rb(2), one W(3), and one W(4) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to one Rb(2), one W(1), and one W(2) atom. In the fifteenth O site, O(15) is bonded in a 3-coordinate geometry to one Rb(2), one Nd(1), and one W(1) atom. In the sixteenth O site, O(16) is bonded in a 4-coordinate geometry to one Rb(1), one Nd(2), one W(1), and one W(3) atom. is represented by the CIF file [CIF]
data_Rb2Nd2Mg(WO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.606
_cell_length_b   8.366
_cell_length_c   7.543
_cell_angle_alpha   64.373
_cell_angle_beta   61.227
_cell_angle_gamma   87.710
_symmetry_Int_Tables_number   1
_cell_volume   370.634
_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  0.797  0.206  0.752  1.0
  Rb  Rb1  1  0.210  0.803  0.239  1.0
  Nd  Nd2  1  0.259  0.840  0.702  1.0
  Nd  Nd3  1  0.739  0.162  0.287  1.0
  Mg  Mg4  1  0.077  0.472  0.055  1.0
  W  W5  1  0.687  0.687  0.802  1.0
  W  W6  1  0.690  0.676  0.305  1.0
  W  W7  1  0.334  0.317  0.203  1.0
  W  W8  1  0.314  0.324  0.703  1.0
  O  O9  1  0.609  0.386  0.452  1.0
  O  O10  1  0.262  0.082  0.781  1.0
  O  O11  1  0.044  0.340  0.901  1.0
  O  O12  1  0.400  0.081  0.345  1.0
  O  O13  1  0.746  0.620  0.568  1.0
  O  O14  1  0.386  0.275  0.927  1.0
  O  O15  1  0.610  0.904  0.655  1.0
  O  O16  1  0.382  0.606  0.559  1.0
  O  O17  1  0.034  0.242  0.309  1.0
  O  O18  1  0.754  0.922  0.210  1.0
  O  O19  1  0.354  0.580  0.972  1.0
  O  O20  1  0.972  0.675  0.083  1.0
  O  O21  1  0.248  0.368  0.452  1.0
  O  O22  1  0.611  0.719  0.070  1.0
  O  O23  1  0.960  0.772  0.680  1.0
  O  O24  1  0.641  0.417  0.023  1.0
[/CIF]
.