The material described by Rb2CaNd2(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 11-coordinate geometry to one Ca(1), two equivalent O(2), two equivalent O(3), two equivalent O(4), 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. Ca(1) is bonded in a 4-coordinate 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 to two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms to form distorted NdO6 pentagonal pyramids that share corners with four equivalent W(1)O6 octahedra and corners with four equivalent W(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 21-58°. In the second Nd site, Nd(2) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(7) atoms to form distorted NdO6 pentagonal pyramids that share corners with four equivalent W(1)O6 octahedra and corners with four equivalent W(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 27-58°. 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 WO6 octahedra that share corners with two equivalent W(2)O6 octahedra, corners with two equivalent Nd(1)O6 pentagonal pyramids, corners with two equivalent Nd(2)O6 pentagonal pyramids, and  an edgeedge with one W(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 35-36°. 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 WO6 octahedra that share corners with two equivalent W(1)O6 octahedra, corners with two equivalent Nd(1)O6 pentagonal pyramids, corners with two equivalent Nd(2)O6 pentagonal pyramids, and  an edgeedge with one W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 35-36°. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Ca(1), one Nd(2), one W(1), and one W(2) atom to form distorted corner-sharing OCaNdW2 trigonal pyramids. 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 3-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 4-coordinate geometry to one Rb(1), one Rb(2), one Nd(1), and one W(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Rb(2), one Ca(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_Rb2CaNd2(WO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.077
_cell_length_b   8.077
_cell_length_c   7.665
_cell_angle_alpha   61.963
_cell_angle_beta   61.963
_cell_angle_gamma   88.851
_symmetry_Int_Tables_number   1
_cell_volume   376.395
_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  0.927  0.073  0.750  1.0
  Rb  Rb1  1  0.198  0.802  0.250  1.0
  Ca  Ca2  1  0.669  0.331  0.750  1.0
  Nd  Nd3  1  0.220  0.780  0.750  1.0
  Nd  Nd4  1  0.766  0.234  0.250  1.0
  W  W5  1  0.677  0.711  0.805  1.0
  W  W6  1  0.677  0.706  0.302  1.0
  W  W7  1  0.294  0.323  0.198  1.0
  W  W8  1  0.289  0.323  0.695  1.0
  O  O9  1  0.605  0.403  0.462  1.0
  O  O10  1  0.278  0.067  0.762  1.0
  O  O11  1  0.028  0.328  0.876  1.0
  O  O12  1  0.284  0.068  0.391  1.0
  O  O13  1  0.731  0.651  0.552  1.0
  O  O14  1  0.349  0.269  0.948  1.0
  O  O15  1  0.672  0.972  0.624  1.0
  O  O16  1  0.384  0.622  0.547  1.0
  O  O17  1  0.037  0.308  0.274  1.0
  O  O18  1  0.692  0.963  0.226  1.0
  O  O19  1  0.378  0.616  0.953  1.0
  O  O20  1  0.932  0.716  0.109  1.0
  O  O21  1  0.256  0.389  0.421  1.0
  O  O22  1  0.611  0.744  0.079  1.0
  O  O23  1  0.933  0.722  0.738  1.0
  O  O24  1  0.597  0.395  0.038  1.0
[/CIF]
.
The material described by Rb2CaNd2(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 11-coordinate geometry to one Ca(1), two equivalent O(2), two equivalent O(3), two equivalent O(4), 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. Ca(1) is bonded in a 4-coordinate 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 to two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms to form distorted NdO6 pentagonal pyramids that share corners with four equivalent W(1)O6 octahedra and corners with four equivalent W(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 21-58°. In the second Nd site, Nd(2) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(7) atoms to form distorted NdO6 pentagonal pyramids that share corners with four equivalent W(1)O6 octahedra and corners with four equivalent W(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 27-58°. 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 WO6 octahedra that share corners with two equivalent W(2)O6 octahedra, corners with two equivalent Nd(1)O6 pentagonal pyramids, corners with two equivalent Nd(2)O6 pentagonal pyramids, and  an edgeedge with one W(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 35-36°. 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 WO6 octahedra that share corners with two equivalent W(1)O6 octahedra, corners with two equivalent Nd(1)O6 pentagonal pyramids, corners with two equivalent Nd(2)O6 pentagonal pyramids, and  an edgeedge with one W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 35-36°. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Ca(1), one Nd(2), one W(1), and one W(2) atom to form distorted corner-sharing OCaNdW2 trigonal pyramids. 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 3-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 4-coordinate geometry to one Rb(1), one Rb(2), one Nd(1), and one W(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Rb(2), one Ca(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_Rb2CaNd2(WO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.077
_cell_length_b   8.077
_cell_length_c   7.665
_cell_angle_alpha   61.963
_cell_angle_beta   61.963
_cell_angle_gamma   88.851
_symmetry_Int_Tables_number   1
_cell_volume   376.395
_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  0.927  0.073  0.750  1.0
  Rb  Rb1  1  0.198  0.802  0.250  1.0
  Ca  Ca2  1  0.669  0.331  0.750  1.0
  Nd  Nd3  1  0.220  0.780  0.750  1.0
  Nd  Nd4  1  0.766  0.234  0.250  1.0
  W  W5  1  0.677  0.711  0.805  1.0
  W  W6  1  0.677  0.706  0.302  1.0
  W  W7  1  0.294  0.323  0.198  1.0
  W  W8  1  0.289  0.323  0.695  1.0
  O  O9  1  0.605  0.403  0.462  1.0
  O  O10  1  0.278  0.067  0.762  1.0
  O  O11  1  0.028  0.328  0.876  1.0
  O  O12  1  0.284  0.068  0.391  1.0
  O  O13  1  0.731  0.651  0.552  1.0
  O  O14  1  0.349  0.269  0.948  1.0
  O  O15  1  0.672  0.972  0.624  1.0
  O  O16  1  0.384  0.622  0.547  1.0
  O  O17  1  0.037  0.308  0.274  1.0
  O  O18  1  0.692  0.963  0.226  1.0
  O  O19  1  0.378  0.616  0.953  1.0
  O  O20  1  0.932  0.716  0.109  1.0
  O  O21  1  0.256  0.389  0.421  1.0
  O  O22  1  0.611  0.744  0.079  1.0
  O  O23  1  0.933  0.722  0.738  1.0
  O  O24  1  0.597  0.395  0.038  1.0
[/CIF]
.