The structure described by MgPr2(BiO3)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a distorted see-saw-like geometry to one O(10), one O(11), one O(2), and one O(6) atom. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 7-coordinate geometry to one O(10), one O(12), one O(2), one O(3), one O(4), one O(5), and one O(7) atom. In the second Pr site, Pr(2) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(11), one O(4), one O(5), one O(6), one O(8), and one O(9) atom. There are four inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to one O(1), one O(10), one O(12), one O(2), one O(5), and one O(8) atom to form BiO6 octahedra that share corners with four equivalent Bi(4)O6 octahedra and corners with two equivalent Bi(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 25-54°. In the second Bi site, Bi(2) is bonded to one O(1), one O(12), one O(3), one O(4), and one O(9) atom to form distorted corner-sharing BiO5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 24-52°. In the third Bi site, Bi(3) is bonded to one O(11), one O(3), one O(4), one O(6), one O(7), and one O(9) atom to form BiO6 octahedra that share corners with two equivalent Bi(4)O6 octahedra and corners with three equivalent Bi(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 43-49°. In the fourth Bi site, Bi(4) is bonded to one O(10), one O(2), one O(5), one O(6), one O(7), and one O(8) atom to form corner-sharing BiO6 octahedra. The corner-sharing octahedral tilt angles range from 25-54°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Pr(2), one Bi(1), and one Bi(2) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Pr(1), one Bi(1), and one Bi(4) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Pr(1), one Bi(2), and one Bi(3) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Pr(1), one Pr(2), one Bi(2), and one Bi(3) atom. In the fifth O site, O(5) is bonded in a distorted square co-planar geometry to one Pr(1), one Pr(2), one Bi(1), and one Bi(4) atom. In the sixth O site, O(6) is bonded in a distorted trigonal pyramidal geometry to one Mg(1), one Pr(2), one Bi(3), and one Bi(4) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Pr(1), one Bi(3), and one Bi(4) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Pr(2), one Bi(1), and one Bi(4) atom. In the ninth O site, O(9) is bonded in a trigonal planar geometry to one Pr(2), one Bi(2), and one Bi(3) atom. In the tenth O site, O(10) is bonded in a 5-coordinate geometry to one Mg(1), one Pr(1), one Pr(2), one Bi(1), and one Bi(4) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Mg(1), one Pr(2), and one Bi(3) atom. In the twelfth O site, O(12) is bonded in a T-shaped geometry to one Pr(1), one Bi(1), and one Bi(2) atom. is represented by the CIF file [CIF]
data_Pr2Mg(BiO3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.765
_cell_length_b   6.193
_cell_length_c   8.463
_cell_angle_alpha   88.244
_cell_angle_beta   88.756
_cell_angle_gamma   91.394
_symmetry_Int_Tables_number   1
_cell_volume   301.880
_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
  Pr  Pr0  1  0.027  0.916  0.755  1.0
  Pr  Pr1  1  0.519  0.597  0.246  1.0
  Mg  Mg2  1  0.005  0.999  0.206  1.0
  Bi  Bi3  1  0.011  0.482  0.009  1.0
  Bi  Bi4  1  0.007  0.474  0.510  1.0
  Bi  Bi5  1  0.501  0.028  0.487  1.0
  Bi  Bi6  1  0.506  0.033  0.991  1.0
  O  O7  1  0.133  0.432  0.249  1.0
  O  O8  1  0.127  0.152  0.974  1.0
  O  O9  1  0.184  0.178  0.573  1.0
  O  O10  1  0.293  0.743  0.547  1.0
  O  O11  1  0.304  0.698  0.979  1.0
  O  O12  1  0.351  0.968  0.249  1.0
  O  O13  1  0.646  0.014  0.720  1.0
  O  O14  1  0.704  0.315  0.096  1.0
  O  O15  1  0.647  0.339  0.439  1.0
  O  O16  1  0.818  0.789  0.063  1.0
  O  O17  1  0.787  0.856  0.388  1.0
  O  O18  1  0.931  0.539  0.770  1.0
[/CIF]
.
The structure described by MgPr2(BiO3)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a distorted see-saw-like geometry to one O(10), one O(11), one O(2), and one O(6) atom. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 7-coordinate geometry to one O(10), one O(12), one O(2), one O(3), one O(4), one O(5), and one O(7) atom. In the second Pr site, Pr(2) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(11), one O(4), one O(5), one O(6), one O(8), and one O(9) atom. There are four inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to one O(1), one O(10), one O(12), one O(2), one O(5), and one O(8) atom to form BiO6 octahedra that share corners with four equivalent Bi(4)O6 octahedra and corners with two equivalent Bi(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 25-54°. In the second Bi site, Bi(2) is bonded to one O(1), one O(12), one O(3), one O(4), and one O(9) atom to form distorted corner-sharing BiO5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 24-52°. In the third Bi site, Bi(3) is bonded to one O(11), one O(3), one O(4), one O(6), one O(7), and one O(9) atom to form BiO6 octahedra that share corners with two equivalent Bi(4)O6 octahedra and corners with three equivalent Bi(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 43-49°. In the fourth Bi site, Bi(4) is bonded to one O(10), one O(2), one O(5), one O(6), one O(7), and one O(8) atom to form corner-sharing BiO6 octahedra. The corner-sharing octahedral tilt angles range from 25-54°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Pr(2), one Bi(1), and one Bi(2) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Pr(1), one Bi(1), and one Bi(4) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Pr(1), one Bi(2), and one Bi(3) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Pr(1), one Pr(2), one Bi(2), and one Bi(3) atom. In the fifth O site, O(5) is bonded in a distorted square co-planar geometry to one Pr(1), one Pr(2), one Bi(1), and one Bi(4) atom. In the sixth O site, O(6) is bonded in a distorted trigonal pyramidal geometry to one Mg(1), one Pr(2), one Bi(3), and one Bi(4) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Pr(1), one Bi(3), and one Bi(4) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Pr(2), one Bi(1), and one Bi(4) atom. In the ninth O site, O(9) is bonded in a trigonal planar geometry to one Pr(2), one Bi(2), and one Bi(3) atom. In the tenth O site, O(10) is bonded in a 5-coordinate geometry to one Mg(1), one Pr(1), one Pr(2), one Bi(1), and one Bi(4) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Mg(1), one Pr(2), and one Bi(3) atom. In the twelfth O site, O(12) is bonded in a T-shaped geometry to one Pr(1), one Bi(1), and one Bi(2) atom. is represented by the CIF file [CIF]
data_Pr2Mg(BiO3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.765
_cell_length_b   6.193
_cell_length_c   8.463
_cell_angle_alpha   88.244
_cell_angle_beta   88.756
_cell_angle_gamma   91.394
_symmetry_Int_Tables_number   1
_cell_volume   301.880
_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
  Pr  Pr0  1  0.027  0.916  0.755  1.0
  Pr  Pr1  1  0.519  0.597  0.246  1.0
  Mg  Mg2  1  0.005  0.999  0.206  1.0
  Bi  Bi3  1  0.011  0.482  0.009  1.0
  Bi  Bi4  1  0.007  0.474  0.510  1.0
  Bi  Bi5  1  0.501  0.028  0.487  1.0
  Bi  Bi6  1  0.506  0.033  0.991  1.0
  O  O7  1  0.133  0.432  0.249  1.0
  O  O8  1  0.127  0.152  0.974  1.0
  O  O9  1  0.184  0.178  0.573  1.0
  O  O10  1  0.293  0.743  0.547  1.0
  O  O11  1  0.304  0.698  0.979  1.0
  O  O12  1  0.351  0.968  0.249  1.0
  O  O13  1  0.646  0.014  0.720  1.0
  O  O14  1  0.704  0.315  0.096  1.0
  O  O15  1  0.647  0.339  0.439  1.0
  O  O16  1  0.818  0.789  0.063  1.0
  O  O17  1  0.787  0.856  0.388  1.0
  O  O18  1  0.931  0.539  0.770  1.0
[/CIF]
.