The material described by Be2Gd2GeO7 crystallizes in the monoclinic Cm space group. There are three inequivalent Be sites. In the first Be site, Be(1) is bonded to one O(1), one O(3), one O(6), and one O(9) atom to form BeO4 tetrahedra that share  a cornercorner with one Be(1)O4 tetrahedra and corners with two equivalent Ge(1)O4 tetrahedra. In the second Be site, Be(2) is bonded to one O(4), one O(7), and two equivalent O(2) atoms to form BeO4 tetrahedra that share  a cornercorner with one Be(3)O4 tetrahedra and corners with two equivalent Ge(1)O4 tetrahedra. In the third Be site, Be(3) is bonded to one O(7), one O(8), and two equivalent O(5) atoms to form BeO4 tetrahedra that share  a cornercorner with one Be(2)O4 tetrahedra and corners with two equivalent Ge(1)O4 tetrahedra. There are three inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(7), one O(8), and one O(9) atom. In the second Gd site, Gd(2) is bonded in a 8-coordinate geometry to one O(6), one O(8), two equivalent O(1), two equivalent O(5), and two equivalent O(9) atoms. In the third Gd site, Gd(3) is bonded in a 8-coordinate geometry to one O(4), one O(6), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Ge(1) is bonded to one O(2), one O(3), one O(5), and one O(9) atom to form GeO4 tetrahedra that share  a cornercorner with one Be(2)O4 tetrahedra,  a cornercorner with one Be(3)O4 tetrahedra, and corners with two equivalent Be(1)O4 tetrahedra. There are nine inequivalent O sites. In the first O site, O(1) is bonded to one Be(1), one Gd(1), one Gd(2), and one Gd(3) atom to form distorted OGd3Be tetrahedra that share  a cornercorner with one O(6)Gd2Be2 tetrahedra,  a cornercorner with one O(7)Gd2Be2 tetrahedra, corners with two equivalent O(4)Gd3Be tetrahedra, corners with two equivalent O(8)Gd3Be tetrahedra,  an edgeedge with one O(6)Gd2Be2 tetrahedra, and  an edgeedge with one O(1)Gd3Be tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Be(2), one Gd(1), one Gd(3), and one Ge(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Be(1), one Gd(1), one Gd(3), and one Ge(1) atom. In the fourth O site, O(4) is bonded to one Be(2), one Gd(3), and two equivalent Gd(1) atoms to form distorted OGd3Be tetrahedra that share  a cornercorner with one O(6)Gd2Be2 tetrahedra,  a cornercorner with one O(7)Gd2Be2 tetrahedra, corners with four equivalent O(1)Gd3Be tetrahedra,  an edgeedge with one O(7)Gd2Be2 tetrahedra, and  an edgeedge with one O(8)Gd3Be tetrahedra. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Be(3), one Gd(1), one Gd(2), and one Ge(1) atom. In the sixth O site, O(6) is bonded to two equivalent Be(1), one Gd(2), and one Gd(3) atom to form a mixture of distorted corner and edge-sharing OGd2Be2 tetrahedra. In the seventh O site, O(7) is bonded to one Be(2), one Be(3), and two equivalent Gd(1) atoms to form a mixture of distorted corner and edge-sharing OGd2Be2 tetrahedra. In the eighth O site, O(8) is bonded to one Be(3), one Gd(2), and two equivalent Gd(1) atoms to form distorted OGd3Be tetrahedra that share  a cornercorner with one O(6)Gd2Be2 tetrahedra,  a cornercorner with one O(7)Gd2Be2 tetrahedra, corners with four equivalent O(1)Gd3Be tetrahedra,  an edgeedge with one O(7)Gd2Be2 tetrahedra, and  an edgeedge with one O(4)Gd3Be tetrahedra. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Be(1), one Gd(1), one Gd(2), and one Ge(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Gd2Be2GeO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.868
_cell_length_b   7.519
_cell_length_c   7.515
_cell_angle_alpha   89.958
_cell_angle_beta   89.940
_cell_angle_gamma   90.063
_symmetry_Int_Tables_number   1
_cell_volume   275.094
_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
  Gd  Gd0  1  0.505  0.659  0.159  1.0
  Gd  Gd1  1  0.504  0.341  0.841  1.0
  Gd  Gd2  1  0.495  0.841  0.659  1.0
  Gd  Gd3  1  0.496  0.159  0.341  1.0
  Be  Be4  1  0.954  0.134  0.635  1.0
  Be  Be5  1  0.046  0.366  0.135  1.0
  Be  Be6  1  0.954  0.865  0.365  1.0
  Be  Be7  1  0.046  0.635  0.865  1.0
  Ge  Ge8  1  0.000  1.000  1.000  1.0
  Ge  Ge9  1  0.000  0.501  0.500  1.0
  O  O10  1  0.280  0.858  0.359  1.0
  O  O11  1  0.212  0.419  0.328  1.0
  O  O12  1  0.788  0.328  0.581  1.0
  O  O13  1  0.720  0.359  0.142  1.0
  O  O14  1  0.788  0.919  0.172  1.0
  O  O15  1  0.212  0.581  0.672  1.0
  O  O16  1  0.818  1.000  0.500  1.0
  O  O17  1  0.280  0.141  0.642  1.0
  O  O18  1  0.183  0.500  1.000  1.0
  O  O19  1  0.720  0.642  0.858  1.0
  O  O20  1  0.212  0.172  0.081  1.0
  O  O21  1  0.787  0.081  0.828  1.0
  O  O22  1  0.212  0.828  0.919  1.0
  O  O23  1  0.787  0.672  0.419  1.0
[/CIF]
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The material described by Be2Gd2GeO7 crystallizes in the monoclinic Cm space group. There are three inequivalent Be sites. In the first Be site, Be(1) is bonded to one O(1), one O(3), one O(6), and one O(9) atom to form BeO4 tetrahedra that share  a cornercorner with one Be(1)O4 tetrahedra and corners with two equivalent Ge(1)O4 tetrahedra. In the second Be site, Be(2) is bonded to one O(4), one O(7), and two equivalent O(2) atoms to form BeO4 tetrahedra that share  a cornercorner with one Be(3)O4 tetrahedra and corners with two equivalent Ge(1)O4 tetrahedra. In the third Be site, Be(3) is bonded to one O(7), one O(8), and two equivalent O(5) atoms to form BeO4 tetrahedra that share  a cornercorner with one Be(2)O4 tetrahedra and corners with two equivalent Ge(1)O4 tetrahedra. There are three inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(7), one O(8), and one O(9) atom. In the second Gd site, Gd(2) is bonded in a 8-coordinate geometry to one O(6), one O(8), two equivalent O(1), two equivalent O(5), and two equivalent O(9) atoms. In the third Gd site, Gd(3) is bonded in a 8-coordinate geometry to one O(4), one O(6), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Ge(1) is bonded to one O(2), one O(3), one O(5), and one O(9) atom to form GeO4 tetrahedra that share  a cornercorner with one Be(2)O4 tetrahedra,  a cornercorner with one Be(3)O4 tetrahedra, and corners with two equivalent Be(1)O4 tetrahedra. There are nine inequivalent O sites. In the first O site, O(1) is bonded to one Be(1), one Gd(1), one Gd(2), and one Gd(3) atom to form distorted OGd3Be tetrahedra that share  a cornercorner with one O(6)Gd2Be2 tetrahedra,  a cornercorner with one O(7)Gd2Be2 tetrahedra, corners with two equivalent O(4)Gd3Be tetrahedra, corners with two equivalent O(8)Gd3Be tetrahedra,  an edgeedge with one O(6)Gd2Be2 tetrahedra, and  an edgeedge with one O(1)Gd3Be tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Be(2), one Gd(1), one Gd(3), and one Ge(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Be(1), one Gd(1), one Gd(3), and one Ge(1) atom. In the fourth O site, O(4) is bonded to one Be(2), one Gd(3), and two equivalent Gd(1) atoms to form distorted OGd3Be tetrahedra that share  a cornercorner with one O(6)Gd2Be2 tetrahedra,  a cornercorner with one O(7)Gd2Be2 tetrahedra, corners with four equivalent O(1)Gd3Be tetrahedra,  an edgeedge with one O(7)Gd2Be2 tetrahedra, and  an edgeedge with one O(8)Gd3Be tetrahedra. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Be(3), one Gd(1), one Gd(2), and one Ge(1) atom. In the sixth O site, O(6) is bonded to two equivalent Be(1), one Gd(2), and one Gd(3) atom to form a mixture of distorted corner and edge-sharing OGd2Be2 tetrahedra. In the seventh O site, O(7) is bonded to one Be(2), one Be(3), and two equivalent Gd(1) atoms to form a mixture of distorted corner and edge-sharing OGd2Be2 tetrahedra. In the eighth O site, O(8) is bonded to one Be(3), one Gd(2), and two equivalent Gd(1) atoms to form distorted OGd3Be tetrahedra that share  a cornercorner with one O(6)Gd2Be2 tetrahedra,  a cornercorner with one O(7)Gd2Be2 tetrahedra, corners with four equivalent O(1)Gd3Be tetrahedra,  an edgeedge with one O(7)Gd2Be2 tetrahedra, and  an edgeedge with one O(4)Gd3Be tetrahedra. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Be(1), one Gd(1), one Gd(2), and one Ge(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Gd2Be2GeO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.868
_cell_length_b   7.519
_cell_length_c   7.515
_cell_angle_alpha   89.958
_cell_angle_beta   89.940
_cell_angle_gamma   90.063
_symmetry_Int_Tables_number   1
_cell_volume   275.094
_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
  Gd  Gd0  1  0.505  0.659  0.159  1.0
  Gd  Gd1  1  0.504  0.341  0.841  1.0
  Gd  Gd2  1  0.495  0.841  0.659  1.0
  Gd  Gd3  1  0.496  0.159  0.341  1.0
  Be  Be4  1  0.954  0.134  0.635  1.0
  Be  Be5  1  0.046  0.366  0.135  1.0
  Be  Be6  1  0.954  0.865  0.365  1.0
  Be  Be7  1  0.046  0.635  0.865  1.0
  Ge  Ge8  1  0.000  1.000  1.000  1.0
  Ge  Ge9  1  0.000  0.501  0.500  1.0
  O  O10  1  0.280  0.858  0.359  1.0
  O  O11  1  0.212  0.419  0.328  1.0
  O  O12  1  0.788  0.328  0.581  1.0
  O  O13  1  0.720  0.359  0.142  1.0
  O  O14  1  0.788  0.919  0.172  1.0
  O  O15  1  0.212  0.581  0.672  1.0
  O  O16  1  0.818  1.000  0.500  1.0
  O  O17  1  0.280  0.141  0.642  1.0
  O  O18  1  0.183  0.500  1.000  1.0
  O  O19  1  0.720  0.642  0.858  1.0
  O  O20  1  0.212  0.172  0.081  1.0
  O  O21  1  0.787  0.081  0.828  1.0
  O  O22  1  0.212  0.828  0.919  1.0
  O  O23  1  0.787  0.672  0.419  1.0
[/CIF]
.