The material described by Dy2Ge2O7 crystallizes in the triclinic P-1 space group. There are four inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a 7-coordinate geometry to one O(11), one O(2), one O(4), one O(5), one O(9), and two equivalent O(1) atoms. In the second Dy site, Dy(2) is bonded in a 8-coordinate geometry to one O(12), one O(13), one O(2), one O(4), one O(6), one O(7), and two equivalent O(3) atoms. In the third Dy site, Dy(3) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(11), one O(12), one O(2), one O(5), one O(7), and one O(9) atom. In the fourth Dy site, Dy(4) is bonded in a 6-coordinate geometry to one O(10), one O(13), one O(14), one O(3), one O(6), and one O(7) atom. There are four inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(3), one O(4), one O(7), and one O(8) atom to form corner-sharing GeO4 tetrahedra. In the second Ge site, Ge(2) is bonded in a tetrahedral geometry to one O(1), one O(10), one O(2), and one O(5) atom. In the third Ge site, Ge(3) is bonded to one O(13), one O(14), one O(6), and one O(8) atom to form corner-sharing GeO4 tetrahedra. In the fourth Ge site, Ge(4) is bonded to one O(11), one O(12), one O(14), and one O(9) atom to form corner-sharing GeO4 tetrahedra. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded to one Dy(3), two equivalent Dy(1), and one Ge(2) atom to form a mixture of distorted corner and edge-sharing ODy3Ge tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Dy(1), one Dy(2), one Dy(3), and one Ge(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Dy(4), two equivalent Dy(2), and one Ge(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Dy(1), one Dy(2), and one Ge(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Dy(1), one Dy(3), and one Ge(2) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Dy(2), one Dy(4), and one Ge(3) atom. In the seventh O site, O(7) is bonded to one Dy(2), one Dy(3), one Dy(4), and one Ge(1) atom to form distorted corner-sharing ODy3Ge tetrahedra. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Ge(1) and one Ge(3) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Dy(1), one Dy(3), and one Ge(4) atom. In the tenth O site, O(10) is bonded in a trigonal planar geometry to one Dy(3), one Dy(4), and one Ge(2) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal non-coplanar geometry to one Dy(1), one Dy(3), and one Ge(4) atom. In the twelfth O site, O(12) is bonded in a 1-coordinate geometry to one Dy(2), one Dy(3), and one Ge(4) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Dy(2), one Dy(4), and one Ge(3) atom. In the fourteenth O site, O(14) is bonded in a trigonal planar geometry to one Dy(4), one Ge(3), and one Ge(4) atom. is represented by the CIF file [CIF]
data_Dy2Ge2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.820
_cell_length_b   6.845
_cell_length_c   12.423
_cell_angle_alpha   94.820
_cell_angle_beta   91.966
_cell_angle_gamma   91.860
_symmetry_Int_Tables_number   1
_cell_volume   577.169
_cell_formula_units_Z   4
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  0.049  0.333  0.112  1.0
  Dy  Dy1  1  0.112  0.091  0.357  1.0
  Dy  Dy2  1  0.314  0.834  0.117  1.0
  Dy  Dy3  1  0.375  0.211  0.632  1.0
  Dy  Dy4  1  0.625  0.789  0.368  1.0
  Dy  Dy5  1  0.686  0.166  0.883  1.0
  Dy  Dy6  1  0.888  0.909  0.643  1.0
  Dy  Dy7  1  0.951  0.667  0.888  1.0
  Ge  Ge8  1  0.139  0.622  0.377  1.0
  Ge  Ge9  1  0.167  0.143  0.885  1.0
  Ge  Ge10  1  0.389  0.724  0.600  1.0
  Ge  Ge11  1  0.515  0.338  0.167  1.0
  Ge  Ge12  1  0.485  0.662  0.833  1.0
  Ge  Ge13  1  0.611  0.276  0.400  1.0
  Ge  Ge14  1  0.833  0.857  0.115  1.0
  Ge  Ge15  1  0.861  0.378  0.623  1.0
  O  O16  1  0.002  0.665  0.081  1.0
  O  O17  1  0.990  0.977  0.816  1.0
  O  O18  1  0.046  0.218  0.576  1.0
  O  O19  1  0.065  0.403  0.302  1.0
  O  O20  1  0.244  0.095  0.016  1.0
  O  O21  1  0.224  0.910  0.627  1.0
  O  O22  1  0.286  0.795  0.310  1.0
  O  O23  1  0.299  0.559  0.486  1.0
  O  O24  1  0.288  0.714  0.916  1.0
  O  O25  1  0.368  0.208  0.812  1.0
  O  O26  1  0.342  0.496  0.118  1.0
  O  O27  1  0.393  0.137  0.221  1.0
  O  O28  1  0.403  0.157  0.450  1.0
  O  O29  1  0.396  0.544  0.697  1.0
  O  O30  1  0.604  0.456  0.303  1.0
  O  O31  1  0.597  0.843  0.550  1.0
  O  O32  1  0.607  0.863  0.779  1.0
  O  O33  1  0.658  0.504  0.882  1.0
  O  O34  1  0.632  0.792  0.188  1.0
  O  O35  1  0.712  0.286  0.084  1.0
  O  O36  1  0.701  0.441  0.514  1.0
  O  O37  1  0.714  0.205  0.690  1.0
  O  O38  1  0.776  0.090  0.373  1.0
  O  O39  1  0.756  0.905  0.984  1.0
  O  O40  1  0.935  0.597  0.698  1.0
  O  O41  1  0.954  0.782  0.424  1.0
  O  O42  1  0.010  0.023  0.184  1.0
  O  O43  1  0.998  0.335  0.919  1.0
[/CIF]
.
The material described by Dy2Ge2O7 crystallizes in the triclinic P-1 space group. There are four inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a 7-coordinate geometry to one O(11), one O(2), one O(4), one O(5), one O(9), and two equivalent O(1) atoms. In the second Dy site, Dy(2) is bonded in a 8-coordinate geometry to one O(12), one O(13), one O(2), one O(4), one O(6), one O(7), and two equivalent O(3) atoms. In the third Dy site, Dy(3) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(11), one O(12), one O(2), one O(5), one O(7), and one O(9) atom. In the fourth Dy site, Dy(4) is bonded in a 6-coordinate geometry to one O(10), one O(13), one O(14), one O(3), one O(6), and one O(7) atom. There are four inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(3), one O(4), one O(7), and one O(8) atom to form corner-sharing GeO4 tetrahedra. In the second Ge site, Ge(2) is bonded in a tetrahedral geometry to one O(1), one O(10), one O(2), and one O(5) atom. In the third Ge site, Ge(3) is bonded to one O(13), one O(14), one O(6), and one O(8) atom to form corner-sharing GeO4 tetrahedra. In the fourth Ge site, Ge(4) is bonded to one O(11), one O(12), one O(14), and one O(9) atom to form corner-sharing GeO4 tetrahedra. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded to one Dy(3), two equivalent Dy(1), and one Ge(2) atom to form a mixture of distorted corner and edge-sharing ODy3Ge tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Dy(1), one Dy(2), one Dy(3), and one Ge(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Dy(4), two equivalent Dy(2), and one Ge(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Dy(1), one Dy(2), and one Ge(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Dy(1), one Dy(3), and one Ge(2) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Dy(2), one Dy(4), and one Ge(3) atom. In the seventh O site, O(7) is bonded to one Dy(2), one Dy(3), one Dy(4), and one Ge(1) atom to form distorted corner-sharing ODy3Ge tetrahedra. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Ge(1) and one Ge(3) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Dy(1), one Dy(3), and one Ge(4) atom. In the tenth O site, O(10) is bonded in a trigonal planar geometry to one Dy(3), one Dy(4), and one Ge(2) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal non-coplanar geometry to one Dy(1), one Dy(3), and one Ge(4) atom. In the twelfth O site, O(12) is bonded in a 1-coordinate geometry to one Dy(2), one Dy(3), and one Ge(4) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Dy(2), one Dy(4), and one Ge(3) atom. In the fourteenth O site, O(14) is bonded in a trigonal planar geometry to one Dy(4), one Ge(3), and one Ge(4) atom. is represented by the CIF file [CIF]
data_Dy2Ge2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.820
_cell_length_b   6.845
_cell_length_c   12.423
_cell_angle_alpha   94.820
_cell_angle_beta   91.966
_cell_angle_gamma   91.860
_symmetry_Int_Tables_number   1
_cell_volume   577.169
_cell_formula_units_Z   4
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  0.049  0.333  0.112  1.0
  Dy  Dy1  1  0.112  0.091  0.357  1.0
  Dy  Dy2  1  0.314  0.834  0.117  1.0
  Dy  Dy3  1  0.375  0.211  0.632  1.0
  Dy  Dy4  1  0.625  0.789  0.368  1.0
  Dy  Dy5  1  0.686  0.166  0.883  1.0
  Dy  Dy6  1  0.888  0.909  0.643  1.0
  Dy  Dy7  1  0.951  0.667  0.888  1.0
  Ge  Ge8  1  0.139  0.622  0.377  1.0
  Ge  Ge9  1  0.167  0.143  0.885  1.0
  Ge  Ge10  1  0.389  0.724  0.600  1.0
  Ge  Ge11  1  0.515  0.338  0.167  1.0
  Ge  Ge12  1  0.485  0.662  0.833  1.0
  Ge  Ge13  1  0.611  0.276  0.400  1.0
  Ge  Ge14  1  0.833  0.857  0.115  1.0
  Ge  Ge15  1  0.861  0.378  0.623  1.0
  O  O16  1  0.002  0.665  0.081  1.0
  O  O17  1  0.990  0.977  0.816  1.0
  O  O18  1  0.046  0.218  0.576  1.0
  O  O19  1  0.065  0.403  0.302  1.0
  O  O20  1  0.244  0.095  0.016  1.0
  O  O21  1  0.224  0.910  0.627  1.0
  O  O22  1  0.286  0.795  0.310  1.0
  O  O23  1  0.299  0.559  0.486  1.0
  O  O24  1  0.288  0.714  0.916  1.0
  O  O25  1  0.368  0.208  0.812  1.0
  O  O26  1  0.342  0.496  0.118  1.0
  O  O27  1  0.393  0.137  0.221  1.0
  O  O28  1  0.403  0.157  0.450  1.0
  O  O29  1  0.396  0.544  0.697  1.0
  O  O30  1  0.604  0.456  0.303  1.0
  O  O31  1  0.597  0.843  0.550  1.0
  O  O32  1  0.607  0.863  0.779  1.0
  O  O33  1  0.658  0.504  0.882  1.0
  O  O34  1  0.632  0.792  0.188  1.0
  O  O35  1  0.712  0.286  0.084  1.0
  O  O36  1  0.701  0.441  0.514  1.0
  O  O37  1  0.714  0.205  0.690  1.0
  O  O38  1  0.776  0.090  0.373  1.0
  O  O39  1  0.756  0.905  0.984  1.0
  O  O40  1  0.935  0.597  0.698  1.0
  O  O41  1  0.954  0.782  0.424  1.0
  O  O42  1  0.010  0.023  0.184  1.0
  O  O43  1  0.998  0.335  0.919  1.0
[/CIF]
.