The material structure described by Be2Dy2GeO7 crystallizes in the tetragonal P-42_1m space group. Be(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form BeO4 tetrahedra that share  a cornercorner with one Be(1)O4 tetrahedra and corners with two equivalent Ge(1)O4 tetrahedra. Dy(1) is bonded in a 8-coordinate geometry to one O(2), three equivalent O(3), and four equivalent O(1) atoms. Ge(1) is bonded to four equivalent O(1) atoms to form GeO4 tetrahedra that share corners with four equivalent Be(1)O4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Be(1), two equivalent Dy(1), and one Ge(1) atom. In the second O site, O(2) is bonded to two equivalent Be(1) and two equivalent Dy(1) atoms to form a mixture of distorted corner and edge-sharing ODy2Be2 tetrahedra. In the third O site, O(3) is bonded to one Be(1) and three equivalent Dy(1) atoms to form distorted ODy3Be tetrahedra that share corners with two equivalent O(2)Dy2Be2 tetrahedra, corners with four equivalent O(3)Dy3Be tetrahedra,  an edgeedge with one O(2)Dy2Be2 tetrahedra, and  an edgeedge with one O(3)Dy3Be tetrahedra. is represented by the CIF card [CIF]
data_Dy2Be2GeO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.448
_cell_length_b   7.448
_cell_length_c   4.825
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   267.662
_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  0.658  0.842  0.506  1.0
  Dy  Dy1  1  0.158  0.658  0.494  1.0
  Dy  Dy2  1  0.842  0.342  0.494  1.0
  Dy  Dy3  1  0.342  0.158  0.506  1.0
  Be  Be4  1  0.365  0.865  0.048  1.0
  Be  Be5  1  0.865  0.635  0.952  1.0
  Be  Be6  1  0.635  0.135  0.048  1.0
  Be  Be7  1  0.135  0.365  0.952  1.0
  Ge  Ge8  1  0.500  0.500  0.000  1.0
  Ge  Ge9  1  0.000  0.000  0.000  1.0
  O  O10  1  0.918  0.829  0.783  1.0
  O  O11  1  0.171  0.918  0.217  1.0
  O  O12  1  0.582  0.329  0.217  1.0
  O  O13  1  0.418  0.671  0.217  1.0
  O  O14  1  0.329  0.418  0.783  1.0
  O  O15  1  0.671  0.582  0.783  1.0
  O  O16  1  0.000  0.500  0.813  1.0
  O  O17  1  0.500  0.000  0.187  1.0
  O  O18  1  0.142  0.358  0.282  1.0
  O  O19  1  0.642  0.142  0.718  1.0
  O  O20  1  0.358  0.858  0.718  1.0
  O  O21  1  0.858  0.642  0.282  1.0
  O  O22  1  0.082  0.171  0.783  1.0
  O  O23  1  0.829  0.082  0.217  1.0
[/CIF]
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The material structure described by Be2Dy2GeO7 crystallizes in the tetragonal P-42_1m space group. Be(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form BeO4 tetrahedra that share  a cornercorner with one Be(1)O4 tetrahedra and corners with two equivalent Ge(1)O4 tetrahedra. Dy(1) is bonded in a 8-coordinate geometry to one O(2), three equivalent O(3), and four equivalent O(1) atoms. Ge(1) is bonded to four equivalent O(1) atoms to form GeO4 tetrahedra that share corners with four equivalent Be(1)O4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Be(1), two equivalent Dy(1), and one Ge(1) atom. In the second O site, O(2) is bonded to two equivalent Be(1) and two equivalent Dy(1) atoms to form a mixture of distorted corner and edge-sharing ODy2Be2 tetrahedra. In the third O site, O(3) is bonded to one Be(1) and three equivalent Dy(1) atoms to form distorted ODy3Be tetrahedra that share corners with two equivalent O(2)Dy2Be2 tetrahedra, corners with four equivalent O(3)Dy3Be tetrahedra,  an edgeedge with one O(2)Dy2Be2 tetrahedra, and  an edgeedge with one O(3)Dy3Be tetrahedra. is represented by the CIF card [CIF]
data_Dy2Be2GeO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.448
_cell_length_b   7.448
_cell_length_c   4.825
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   267.662
_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  0.658  0.842  0.506  1.0
  Dy  Dy1  1  0.158  0.658  0.494  1.0
  Dy  Dy2  1  0.842  0.342  0.494  1.0
  Dy  Dy3  1  0.342  0.158  0.506  1.0
  Be  Be4  1  0.365  0.865  0.048  1.0
  Be  Be5  1  0.865  0.635  0.952  1.0
  Be  Be6  1  0.635  0.135  0.048  1.0
  Be  Be7  1  0.135  0.365  0.952  1.0
  Ge  Ge8  1  0.500  0.500  0.000  1.0
  Ge  Ge9  1  0.000  0.000  0.000  1.0
  O  O10  1  0.918  0.829  0.783  1.0
  O  O11  1  0.171  0.918  0.217  1.0
  O  O12  1  0.582  0.329  0.217  1.0
  O  O13  1  0.418  0.671  0.217  1.0
  O  O14  1  0.329  0.418  0.783  1.0
  O  O15  1  0.671  0.582  0.783  1.0
  O  O16  1  0.000  0.500  0.813  1.0
  O  O17  1  0.500  0.000  0.187  1.0
  O  O18  1  0.142  0.358  0.282  1.0
  O  O19  1  0.642  0.142  0.718  1.0
  O  O20  1  0.358  0.858  0.718  1.0
  O  O21  1  0.858  0.642  0.282  1.0
  O  O22  1  0.082  0.171  0.783  1.0
  O  O23  1  0.829  0.082  0.217  1.0
[/CIF]
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