The compound described by MgEr2Tl2(WO4)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a distorted rectangular see-saw-like geometry to one Tl(2), one O(15), one O(3), one O(4), and one O(7) atom. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 6-coordinate geometry to one O(11), one O(13), one O(15), one O(6), one O(8), and one O(9) atom. In the second Er site, Er(2) is bonded in a 6-coordinate geometry to one O(10), one O(12), one O(14), one O(16), one O(5), and one O(7) atom. There are four inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(10), one O(13), one O(4), one O(7), and one O(9) atom to form a mixture of corner and edge-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 42-50°. In the second W site, W(2) is bonded to one O(10), one O(14), one O(2), one O(3), one O(8), and one O(9) atom to form a mixture of corner and edge-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 40-48°. In the third W site, W(3) is bonded to one O(11), one O(12), one O(15), one O(2), one O(3), and one O(5) atom to form a mixture of corner and edge-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 40-48°. In the fourth W site, W(4) is bonded to one O(1), one O(11), one O(12), one O(16), one O(4), and one O(6) atom to form a mixture of corner and edge-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 42-50°. There are two inequivalent Tl sites. In the first Tl site, Tl(1) is bonded in a 3-coordinate geometry to one O(1), one O(2), and one O(5) atom. In the second Tl site, Tl(2) is bonded in a 4-coordinate geometry to one Mg(1), one O(1), one O(13), and one O(2) atom. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one W(1), one W(4), one Tl(1), and one Tl(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one W(2), one W(3), one Tl(1), and one Tl(2) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Mg(1), one W(2), and one W(3) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Mg(1), one W(1), and one W(4) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Er(2), one W(3), and one Tl(1) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Er(1) and one W(4) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Mg(1), one Er(2), and one W(1) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Er(1) and one W(2) atom. In the ninth O site, O(9) is bonded in a trigonal planar geometry to one Er(1), one W(1), and one W(2) atom. In the tenth O site, O(10) is bonded in a trigonal planar geometry to one Er(2), one W(1), and one W(2) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal non-coplanar geometry to one Er(1), one W(3), and one W(4) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Er(2), one W(3), and one W(4) atom. In the thirteenth O site, O(13) is bonded in a distorted T-shaped geometry to one Er(1), one W(1), and one Tl(2) atom. In the fourteenth O site, O(14) is bonded in a distorted bent 150 degrees geometry to one Er(2) and one W(2) atom. In the fifteenth O site, O(15) is bonded in a distorted T-shaped geometry to one Mg(1), one Er(1), and one W(3) atom. In the sixteenth O site, O(16) is bonded in a bent 150 degrees geometry to one Er(2) and one W(4) atom. is represented by the CIF file [CIF]
data_Er2MgTl2(WO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.590
_cell_length_b   7.899
_cell_length_c   7.508
_cell_angle_alpha   62.208
_cell_angle_beta   61.915
_cell_angle_gamma   86.909
_symmetry_Int_Tables_number   1
_cell_volume   343.355
_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
  Er  Er0  1  0.232  0.793  0.738  1.0
  Er  Er1  1  0.765  0.210  0.250  1.0
  Mg  Mg2  1  0.010  0.521  0.609  1.0
  Tl  Tl3  1  0.756  0.146  0.780  1.0
  Tl  Tl4  1  0.254  0.868  0.174  1.0
  W  W5  1  0.310  0.313  0.697  1.0
  W  W6  1  0.708  0.680  0.302  1.0
  W  W7  1  0.679  0.696  0.809  1.0
  W  W8  1  0.300  0.312  0.205  1.0
  O  O9  1  0.378  0.250  0.951  1.0
  O  O10  1  0.623  0.747  0.072  1.0
  O  O11  1  0.772  0.608  0.560  1.0
  O  O12  1  0.223  0.393  0.445  1.0
  O  O13  1  0.643  0.937  0.623  1.0
  O  O14  1  0.353  0.077  0.382  1.0
  O  O15  1  0.028  0.334  0.888  1.0
  O  O16  1  0.965  0.672  0.106  1.0
  O  O17  1  0.398  0.613  0.556  1.0
  O  O18  1  0.616  0.381  0.445  1.0
  O  O19  1  0.359  0.595  0.969  1.0
  O  O20  1  0.620  0.409  0.045  1.0
  O  O21  1  0.252  0.049  0.792  1.0
  O  O22  1  0.743  0.939  0.226  1.0
  O  O23  1  0.976  0.733  0.697  1.0
  O  O24  1  0.029  0.242  0.304  1.0
[/CIF]
.
The compound described by MgEr2Tl2(WO4)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a distorted rectangular see-saw-like geometry to one Tl(2), one O(15), one O(3), one O(4), and one O(7) atom. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 6-coordinate geometry to one O(11), one O(13), one O(15), one O(6), one O(8), and one O(9) atom. In the second Er site, Er(2) is bonded in a 6-coordinate geometry to one O(10), one O(12), one O(14), one O(16), one O(5), and one O(7) atom. There are four inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(10), one O(13), one O(4), one O(7), and one O(9) atom to form a mixture of corner and edge-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 42-50°. In the second W site, W(2) is bonded to one O(10), one O(14), one O(2), one O(3), one O(8), and one O(9) atom to form a mixture of corner and edge-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 40-48°. In the third W site, W(3) is bonded to one O(11), one O(12), one O(15), one O(2), one O(3), and one O(5) atom to form a mixture of corner and edge-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 40-48°. In the fourth W site, W(4) is bonded to one O(1), one O(11), one O(12), one O(16), one O(4), and one O(6) atom to form a mixture of corner and edge-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 42-50°. There are two inequivalent Tl sites. In the first Tl site, Tl(1) is bonded in a 3-coordinate geometry to one O(1), one O(2), and one O(5) atom. In the second Tl site, Tl(2) is bonded in a 4-coordinate geometry to one Mg(1), one O(1), one O(13), and one O(2) atom. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one W(1), one W(4), one Tl(1), and one Tl(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one W(2), one W(3), one Tl(1), and one Tl(2) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Mg(1), one W(2), and one W(3) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Mg(1), one W(1), and one W(4) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Er(2), one W(3), and one Tl(1) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Er(1) and one W(4) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Mg(1), one Er(2), and one W(1) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Er(1) and one W(2) atom. In the ninth O site, O(9) is bonded in a trigonal planar geometry to one Er(1), one W(1), and one W(2) atom. In the tenth O site, O(10) is bonded in a trigonal planar geometry to one Er(2), one W(1), and one W(2) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal non-coplanar geometry to one Er(1), one W(3), and one W(4) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Er(2), one W(3), and one W(4) atom. In the thirteenth O site, O(13) is bonded in a distorted T-shaped geometry to one Er(1), one W(1), and one Tl(2) atom. In the fourteenth O site, O(14) is bonded in a distorted bent 150 degrees geometry to one Er(2) and one W(2) atom. In the fifteenth O site, O(15) is bonded in a distorted T-shaped geometry to one Mg(1), one Er(1), and one W(3) atom. In the sixteenth O site, O(16) is bonded in a bent 150 degrees geometry to one Er(2) and one W(4) atom. is represented by the CIF file [CIF]
data_Er2MgTl2(WO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.590
_cell_length_b   7.899
_cell_length_c   7.508
_cell_angle_alpha   62.208
_cell_angle_beta   61.915
_cell_angle_gamma   86.909
_symmetry_Int_Tables_number   1
_cell_volume   343.355
_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
  Er  Er0  1  0.232  0.793  0.738  1.0
  Er  Er1  1  0.765  0.210  0.250  1.0
  Mg  Mg2  1  0.010  0.521  0.609  1.0
  Tl  Tl3  1  0.756  0.146  0.780  1.0
  Tl  Tl4  1  0.254  0.868  0.174  1.0
  W  W5  1  0.310  0.313  0.697  1.0
  W  W6  1  0.708  0.680  0.302  1.0
  W  W7  1  0.679  0.696  0.809  1.0
  W  W8  1  0.300  0.312  0.205  1.0
  O  O9  1  0.378  0.250  0.951  1.0
  O  O10  1  0.623  0.747  0.072  1.0
  O  O11  1  0.772  0.608  0.560  1.0
  O  O12  1  0.223  0.393  0.445  1.0
  O  O13  1  0.643  0.937  0.623  1.0
  O  O14  1  0.353  0.077  0.382  1.0
  O  O15  1  0.028  0.334  0.888  1.0
  O  O16  1  0.965  0.672  0.106  1.0
  O  O17  1  0.398  0.613  0.556  1.0
  O  O18  1  0.616  0.381  0.445  1.0
  O  O19  1  0.359  0.595  0.969  1.0
  O  O20  1  0.620  0.409  0.045  1.0
  O  O21  1  0.252  0.049  0.792  1.0
  O  O22  1  0.743  0.939  0.226  1.0
  O  O23  1  0.976  0.733  0.697  1.0
  O  O24  1  0.029  0.242  0.304  1.0
[/CIF]
.