The material structure described by Y2GeBe2O7 crystallizes in the tetragonal P-42_1m space group. Be(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form BeO4 tetrahedra that share  a cornercorner with one Be(1)O4 tetrahedra and corners with two equivalent Ge(1)O4 tetrahedra. Y(1) is bonded in a 8-coordinate geometry to one O(1), three equivalent O(2), and four equivalent O(3) atoms. Ge(1) is bonded to four equivalent O(3) 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 to two equivalent Be(1) and two equivalent Y(1) atoms to form a mixture of distorted corner and edge-sharing OY2Be2 tetrahedra. In the second O site, O(2) is bonded to one Be(1) and three equivalent Y(1) atoms to form distorted OY3Be tetrahedra that share corners with two equivalent O(1)Y2Be2 tetrahedra, corners with four equivalent O(2)Y3Be tetrahedra,  an edgeedge with one O(1)Y2Be2 tetrahedra, and  an edgeedge with one O(2)Y3Be tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Be(1), two equivalent Y(1), and one Ge(1) atom. is represented by the CIF file [CIF]
data_Y2Be2GeO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.461
_cell_length_b   7.461
_cell_length_c   4.833
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   269.083
_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
  Y  Y0  1  0.342  0.158  0.506  1.0
  Y  Y1  1  0.842  0.342  0.494  1.0
  Y  Y2  1  0.158  0.658  0.494  1.0
  Y  Y3  1  0.658  0.842  0.506  1.0
  Be  Be4  1  0.135  0.365  0.952  1.0
  Be  Be5  1  0.635  0.135  0.048  1.0
  Be  Be6  1  0.365  0.865  0.048  1.0
  Be  Be7  1  0.865  0.635  0.952  1.0
  Ge  Ge8  1  0.000  0.000  0.000  1.0
  Ge  Ge9  1  0.500  0.500  0.000  1.0
  O  O10  1  0.000  0.500  0.813  1.0
  O  O11  1  0.500  0.000  0.187  1.0
  O  O12  1  0.142  0.358  0.281  1.0
  O  O13  1  0.642  0.142  0.719  1.0
  O  O14  1  0.358  0.858  0.719  1.0
  O  O15  1  0.858  0.642  0.281  1.0
  O  O16  1  0.082  0.172  0.784  1.0
  O  O17  1  0.828  0.082  0.216  1.0
  O  O18  1  0.172  0.918  0.216  1.0
  O  O19  1  0.918  0.828  0.784  1.0
  O  O20  1  0.582  0.328  0.216  1.0
  O  O21  1  0.418  0.672  0.216  1.0
  O  O22  1  0.672  0.582  0.784  1.0
  O  O23  1  0.328  0.418  0.784  1.0
[/CIF]
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The material structure described by Y2GeBe2O7 crystallizes in the tetragonal P-42_1m space group. Be(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form BeO4 tetrahedra that share  a cornercorner with one Be(1)O4 tetrahedra and corners with two equivalent Ge(1)O4 tetrahedra. Y(1) is bonded in a 8-coordinate geometry to one O(1), three equivalent O(2), and four equivalent O(3) atoms. Ge(1) is bonded to four equivalent O(3) 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 to two equivalent Be(1) and two equivalent Y(1) atoms to form a mixture of distorted corner and edge-sharing OY2Be2 tetrahedra. In the second O site, O(2) is bonded to one Be(1) and three equivalent Y(1) atoms to form distorted OY3Be tetrahedra that share corners with two equivalent O(1)Y2Be2 tetrahedra, corners with four equivalent O(2)Y3Be tetrahedra,  an edgeedge with one O(1)Y2Be2 tetrahedra, and  an edgeedge with one O(2)Y3Be tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Be(1), two equivalent Y(1), and one Ge(1) atom. is represented by the CIF file [CIF]
data_Y2Be2GeO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.461
_cell_length_b   7.461
_cell_length_c   4.833
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   269.083
_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
  Y  Y0  1  0.342  0.158  0.506  1.0
  Y  Y1  1  0.842  0.342  0.494  1.0
  Y  Y2  1  0.158  0.658  0.494  1.0
  Y  Y3  1  0.658  0.842  0.506  1.0
  Be  Be4  1  0.135  0.365  0.952  1.0
  Be  Be5  1  0.635  0.135  0.048  1.0
  Be  Be6  1  0.365  0.865  0.048  1.0
  Be  Be7  1  0.865  0.635  0.952  1.0
  Ge  Ge8  1  0.000  0.000  0.000  1.0
  Ge  Ge9  1  0.500  0.500  0.000  1.0
  O  O10  1  0.000  0.500  0.813  1.0
  O  O11  1  0.500  0.000  0.187  1.0
  O  O12  1  0.142  0.358  0.281  1.0
  O  O13  1  0.642  0.142  0.719  1.0
  O  O14  1  0.358  0.858  0.719  1.0
  O  O15  1  0.858  0.642  0.281  1.0
  O  O16  1  0.082  0.172  0.784  1.0
  O  O17  1  0.828  0.082  0.216  1.0
  O  O18  1  0.172  0.918  0.216  1.0
  O  O19  1  0.918  0.828  0.784  1.0
  O  O20  1  0.582  0.328  0.216  1.0
  O  O21  1  0.418  0.672  0.216  1.0
  O  O22  1  0.672  0.582  0.784  1.0
  O  O23  1  0.328  0.418  0.784  1.0
[/CIF]
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