The structure described by Dy3TaO7 crystallizes in the monoclinic Pc space group. There are three inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a distorted hexagonal planar geometry to one O(2), one O(4), one O(5), one O(7), and two equivalent O(1) atoms. In the second Dy site, Dy(2) is bonded in a 7-coordinate geometry to one O(1), one O(3), one O(6), two equivalent O(2), and two equivalent O(4) atoms. In the third Dy site, Dy(3) is bonded in a 7-coordinate geometry to one O(1), one O(3), one O(6), two equivalent O(5), and two equivalent O(7) atoms. Ta(1) is bonded in a distorted body-centered cubic geometry to one O(2), one O(4), one O(5), one O(7), two equivalent O(3), and two equivalent O(6) atoms. There are seven inequivalent O sites. In the first O site, O(1) is bonded to one Dy(2), one Dy(3), and two equivalent Dy(1) atoms to form ODy4 tetrahedra that share corners with two equivalent O(3)Dy2Ta2 tetrahedra, corners with two equivalent O(6)Dy2Ta2 tetrahedra, corners with two equivalent O(2)Dy3Ta tetrahedra, corners with two equivalent O(4)Dy3Ta tetrahedra, corners with two equivalent O(5)Dy3Ta tetrahedra, corners with two equivalent O(7)Dy3Ta tetrahedra, corners with two equivalent O(1)Dy4 tetrahedra,  an edgeedge with one O(2)Dy3Ta tetrahedra,  an edgeedge with one O(4)Dy3Ta tetrahedra,  an edgeedge with one O(5)Dy3Ta tetrahedra, and  an edgeedge with one O(7)Dy3Ta tetrahedra. In the second O site, O(2) is bonded to one Dy(1), two equivalent Dy(2), and one Ta(1) atom to form ODy3Ta tetrahedra that share corners with two equivalent O(3)Dy2Ta2 tetrahedra, corners with two equivalent O(6)Dy2Ta2 tetrahedra, corners with two equivalent O(2)Dy3Ta tetrahedra, corners with two equivalent O(4)Dy3Ta tetrahedra, corners with two equivalent O(5)Dy3Ta tetrahedra, corners with two equivalent O(7)Dy3Ta tetrahedra, corners with two equivalent O(1)Dy4 tetrahedra,  an edgeedge with one O(3)Dy2Ta2 tetrahedra,  an edgeedge with one O(6)Dy2Ta2 tetrahedra,  an edgeedge with one O(1)Dy4 tetrahedra, and edges with two equivalent O(4)Dy3Ta tetrahedra. In the third O site, O(3) is bonded to one Dy(2), one Dy(3), and two equivalent Ta(1) atoms to form distorted ODy2Ta2 tetrahedra that share corners with two equivalent O(3)Dy2Ta2 tetrahedra, corners with two equivalent O(6)Dy2Ta2 tetrahedra, corners with two equivalent O(2)Dy3Ta tetrahedra, corners with two equivalent O(4)Dy3Ta tetrahedra, corners with two equivalent O(5)Dy3Ta tetrahedra, corners with two equivalent O(7)Dy3Ta tetrahedra, corners with two equivalent O(1)Dy4 tetrahedra,  an edgeedge with one O(2)Dy3Ta tetrahedra,  an edgeedge with one O(4)Dy3Ta tetrahedra,  an edgeedge with one O(5)Dy3Ta tetrahedra,  an edgeedge with one O(7)Dy3Ta tetrahedra, and edges with two equivalent O(6)Dy2Ta2 tetrahedra. In the fourth O site, O(4) is bonded to one Dy(1), two equivalent Dy(2), and one Ta(1) atom to form distorted ODy3Ta tetrahedra that share corners with two equivalent O(3)Dy2Ta2 tetrahedra, corners with two equivalent O(6)Dy2Ta2 tetrahedra, corners with two equivalent O(2)Dy3Ta tetrahedra, corners with two equivalent O(4)Dy3Ta tetrahedra, corners with two equivalent O(5)Dy3Ta tetrahedra, corners with two equivalent O(7)Dy3Ta tetrahedra, corners with two equivalent O(1)Dy4 tetrahedra,  an edgeedge with one O(3)Dy2Ta2 tetrahedra,  an edgeedge with one O(6)Dy2Ta2 tetrahedra,  an edgeedge with one O(1)Dy4 tetrahedra, and edges with two equivalent O(2)Dy3Ta tetrahedra. In the fifth O site, O(5) is bonded to one Dy(1), two equivalent Dy(3), and one Ta(1) atom to form ODy3Ta tetrahedra that share corners with two equivalent O(3)Dy2Ta2 tetrahedra, corners with two equivalent O(6)Dy2Ta2 tetrahedra, corners with two equivalent O(2)Dy3Ta tetrahedra, corners with two equivalent O(4)Dy3Ta tetrahedra, corners with two equivalent O(5)Dy3Ta tetrahedra, corners with two equivalent O(7)Dy3Ta tetrahedra, corners with two equivalent O(1)Dy4 tetrahedra,  an edgeedge with one O(3)Dy2Ta2 tetrahedra,  an edgeedge with one O(6)Dy2Ta2 tetrahedra,  an edgeedge with one O(1)Dy4 tetrahedra, and edges with two equivalent O(7)Dy3Ta tetrahedra. In the sixth O site, O(6) is bonded to one Dy(2), one Dy(3), and two equivalent Ta(1) atoms to form distorted ODy2Ta2 tetrahedra that share corners with two equivalent O(3)Dy2Ta2 tetrahedra, corners with two equivalent O(6)Dy2Ta2 tetrahedra, corners with two equivalent O(2)Dy3Ta tetrahedra, corners with two equivalent O(4)Dy3Ta tetrahedra, corners with two equivalent O(5)Dy3Ta tetrahedra, corners with two equivalent O(7)Dy3Ta tetrahedra, corners with two equivalent O(1)Dy4 tetrahedra,  an edgeedge with one O(2)Dy3Ta tetrahedra,  an edgeedge with one O(4)Dy3Ta tetrahedra,  an edgeedge with one O(5)Dy3Ta tetrahedra,  an edgeedge with one O(7)Dy3Ta tetrahedra, and edges with two equivalent O(3)Dy2Ta2 tetrahedra. In the seventh O site, O(7) is bonded to one Dy(1), two equivalent Dy(3), and one Ta(1) atom to form distorted ODy3Ta tetrahedra that share corners with two equivalent O(3)Dy2Ta2 tetrahedra, corners with two equivalent O(6)Dy2Ta2 tetrahedra, corners with two equivalent O(2)Dy3Ta tetrahedra, corners with two equivalent O(4)Dy3Ta tetrahedra, corners with two equivalent O(5)Dy3Ta tetrahedra, corners with two equivalent O(7)Dy3Ta tetrahedra, corners with two equivalent O(1)Dy4 tetrahedra,  an edgeedge with one O(3)Dy2Ta2 tetrahedra,  an edgeedge with one O(6)Dy2Ta2 tetrahedra,  an edgeedge with one O(1)Dy4 tetrahedra, and edges with two equivalent O(5)Dy3Ta tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Dy3TaO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.357
_cell_length_b   7.594
_cell_length_c   8.149
_cell_angle_alpha   62.290
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   293.476
_cell_formula_units_Z   2
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
  Dy  Dy0  1  0.496  0.997  1.000  1.0
  Dy  Dy1  1  0.504  0.497  1.000  1.0
  Dy  Dy2  1  0.023  0.119  0.260  1.0
  Dy  Dy3  1  0.977  0.619  0.260  1.0
  Dy  Dy4  1  0.025  0.380  0.738  1.0
  Dy  Dy5  1  0.975  0.880  0.738  1.0
  Ta  Ta6  1  0.496  0.778  0.500  1.0
  Ta  Ta7  1  0.504  0.278  0.500  1.0
  O  O8  1  0.255  0.247  0.000  1.0
  O  O9  1  0.734  0.900  0.262  1.0
  O  O10  1  0.288  0.482  0.524  1.0
  O  O11  1  0.730  0.335  0.264  1.0
  O  O12  1  0.266  0.400  0.262  1.0
  O  O13  1  0.737  0.159  0.745  1.0
  O  O14  1  0.278  0.001  0.477  1.0
  O  O15  1  0.712  0.982  0.524  1.0
  O  O16  1  0.270  0.835  0.264  1.0
  O  O17  1  0.263  0.659  0.745  1.0
  O  O18  1  0.729  0.604  0.731  1.0
  O  O19  1  0.722  0.501  0.477  1.0
  O  O20  1  0.271  0.104  0.731  1.0
  O  O21  1  0.745  0.747  0.000  1.0
[/CIF]
.
The structure described by Dy3TaO7 crystallizes in the monoclinic Pc space group. There are three inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a distorted hexagonal planar geometry to one O(2), one O(4), one O(5), one O(7), and two equivalent O(1) atoms. In the second Dy site, Dy(2) is bonded in a 7-coordinate geometry to one O(1), one O(3), one O(6), two equivalent O(2), and two equivalent O(4) atoms. In the third Dy site, Dy(3) is bonded in a 7-coordinate geometry to one O(1), one O(3), one O(6), two equivalent O(5), and two equivalent O(7) atoms. Ta(1) is bonded in a distorted body-centered cubic geometry to one O(2), one O(4), one O(5), one O(7), two equivalent O(3), and two equivalent O(6) atoms. There are seven inequivalent O sites. In the first O site, O(1) is bonded to one Dy(2), one Dy(3), and two equivalent Dy(1) atoms to form ODy4 tetrahedra that share corners with two equivalent O(3)Dy2Ta2 tetrahedra, corners with two equivalent O(6)Dy2Ta2 tetrahedra, corners with two equivalent O(2)Dy3Ta tetrahedra, corners with two equivalent O(4)Dy3Ta tetrahedra, corners with two equivalent O(5)Dy3Ta tetrahedra, corners with two equivalent O(7)Dy3Ta tetrahedra, corners with two equivalent O(1)Dy4 tetrahedra,  an edgeedge with one O(2)Dy3Ta tetrahedra,  an edgeedge with one O(4)Dy3Ta tetrahedra,  an edgeedge with one O(5)Dy3Ta tetrahedra, and  an edgeedge with one O(7)Dy3Ta tetrahedra. In the second O site, O(2) is bonded to one Dy(1), two equivalent Dy(2), and one Ta(1) atom to form ODy3Ta tetrahedra that share corners with two equivalent O(3)Dy2Ta2 tetrahedra, corners with two equivalent O(6)Dy2Ta2 tetrahedra, corners with two equivalent O(2)Dy3Ta tetrahedra, corners with two equivalent O(4)Dy3Ta tetrahedra, corners with two equivalent O(5)Dy3Ta tetrahedra, corners with two equivalent O(7)Dy3Ta tetrahedra, corners with two equivalent O(1)Dy4 tetrahedra,  an edgeedge with one O(3)Dy2Ta2 tetrahedra,  an edgeedge with one O(6)Dy2Ta2 tetrahedra,  an edgeedge with one O(1)Dy4 tetrahedra, and edges with two equivalent O(4)Dy3Ta tetrahedra. In the third O site, O(3) is bonded to one Dy(2), one Dy(3), and two equivalent Ta(1) atoms to form distorted ODy2Ta2 tetrahedra that share corners with two equivalent O(3)Dy2Ta2 tetrahedra, corners with two equivalent O(6)Dy2Ta2 tetrahedra, corners with two equivalent O(2)Dy3Ta tetrahedra, corners with two equivalent O(4)Dy3Ta tetrahedra, corners with two equivalent O(5)Dy3Ta tetrahedra, corners with two equivalent O(7)Dy3Ta tetrahedra, corners with two equivalent O(1)Dy4 tetrahedra,  an edgeedge with one O(2)Dy3Ta tetrahedra,  an edgeedge with one O(4)Dy3Ta tetrahedra,  an edgeedge with one O(5)Dy3Ta tetrahedra,  an edgeedge with one O(7)Dy3Ta tetrahedra, and edges with two equivalent O(6)Dy2Ta2 tetrahedra. In the fourth O site, O(4) is bonded to one Dy(1), two equivalent Dy(2), and one Ta(1) atom to form distorted ODy3Ta tetrahedra that share corners with two equivalent O(3)Dy2Ta2 tetrahedra, corners with two equivalent O(6)Dy2Ta2 tetrahedra, corners with two equivalent O(2)Dy3Ta tetrahedra, corners with two equivalent O(4)Dy3Ta tetrahedra, corners with two equivalent O(5)Dy3Ta tetrahedra, corners with two equivalent O(7)Dy3Ta tetrahedra, corners with two equivalent O(1)Dy4 tetrahedra,  an edgeedge with one O(3)Dy2Ta2 tetrahedra,  an edgeedge with one O(6)Dy2Ta2 tetrahedra,  an edgeedge with one O(1)Dy4 tetrahedra, and edges with two equivalent O(2)Dy3Ta tetrahedra. In the fifth O site, O(5) is bonded to one Dy(1), two equivalent Dy(3), and one Ta(1) atom to form ODy3Ta tetrahedra that share corners with two equivalent O(3)Dy2Ta2 tetrahedra, corners with two equivalent O(6)Dy2Ta2 tetrahedra, corners with two equivalent O(2)Dy3Ta tetrahedra, corners with two equivalent O(4)Dy3Ta tetrahedra, corners with two equivalent O(5)Dy3Ta tetrahedra, corners with two equivalent O(7)Dy3Ta tetrahedra, corners with two equivalent O(1)Dy4 tetrahedra,  an edgeedge with one O(3)Dy2Ta2 tetrahedra,  an edgeedge with one O(6)Dy2Ta2 tetrahedra,  an edgeedge with one O(1)Dy4 tetrahedra, and edges with two equivalent O(7)Dy3Ta tetrahedra. In the sixth O site, O(6) is bonded to one Dy(2), one Dy(3), and two equivalent Ta(1) atoms to form distorted ODy2Ta2 tetrahedra that share corners with two equivalent O(3)Dy2Ta2 tetrahedra, corners with two equivalent O(6)Dy2Ta2 tetrahedra, corners with two equivalent O(2)Dy3Ta tetrahedra, corners with two equivalent O(4)Dy3Ta tetrahedra, corners with two equivalent O(5)Dy3Ta tetrahedra, corners with two equivalent O(7)Dy3Ta tetrahedra, corners with two equivalent O(1)Dy4 tetrahedra,  an edgeedge with one O(2)Dy3Ta tetrahedra,  an edgeedge with one O(4)Dy3Ta tetrahedra,  an edgeedge with one O(5)Dy3Ta tetrahedra,  an edgeedge with one O(7)Dy3Ta tetrahedra, and edges with two equivalent O(3)Dy2Ta2 tetrahedra. In the seventh O site, O(7) is bonded to one Dy(1), two equivalent Dy(3), and one Ta(1) atom to form distorted ODy3Ta tetrahedra that share corners with two equivalent O(3)Dy2Ta2 tetrahedra, corners with two equivalent O(6)Dy2Ta2 tetrahedra, corners with two equivalent O(2)Dy3Ta tetrahedra, corners with two equivalent O(4)Dy3Ta tetrahedra, corners with two equivalent O(5)Dy3Ta tetrahedra, corners with two equivalent O(7)Dy3Ta tetrahedra, corners with two equivalent O(1)Dy4 tetrahedra,  an edgeedge with one O(3)Dy2Ta2 tetrahedra,  an edgeedge with one O(6)Dy2Ta2 tetrahedra,  an edgeedge with one O(1)Dy4 tetrahedra, and edges with two equivalent O(5)Dy3Ta tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Dy3TaO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.357
_cell_length_b   7.594
_cell_length_c   8.149
_cell_angle_alpha   62.290
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   293.476
_cell_formula_units_Z   2
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
  Dy  Dy0  1  0.496  0.997  1.000  1.0
  Dy  Dy1  1  0.504  0.497  1.000  1.0
  Dy  Dy2  1  0.023  0.119  0.260  1.0
  Dy  Dy3  1  0.977  0.619  0.260  1.0
  Dy  Dy4  1  0.025  0.380  0.738  1.0
  Dy  Dy5  1  0.975  0.880  0.738  1.0
  Ta  Ta6  1  0.496  0.778  0.500  1.0
  Ta  Ta7  1  0.504  0.278  0.500  1.0
  O  O8  1  0.255  0.247  0.000  1.0
  O  O9  1  0.734  0.900  0.262  1.0
  O  O10  1  0.288  0.482  0.524  1.0
  O  O11  1  0.730  0.335  0.264  1.0
  O  O12  1  0.266  0.400  0.262  1.0
  O  O13  1  0.737  0.159  0.745  1.0
  O  O14  1  0.278  0.001  0.477  1.0
  O  O15  1  0.712  0.982  0.524  1.0
  O  O16  1  0.270  0.835  0.264  1.0
  O  O17  1  0.263  0.659  0.745  1.0
  O  O18  1  0.729  0.604  0.731  1.0
  O  O19  1  0.722  0.501  0.477  1.0
  O  O20  1  0.271  0.104  0.731  1.0
  O  O21  1  0.745  0.747  0.000  1.0
[/CIF]
.