The structure described by BeCeSiHO5 crystallizes in the monoclinic P2_1/c space group. Be(1) is bonded to one O(2), one O(5), and two equivalent O(1) atoms to form BeO4 tetrahedra that share corners with three equivalent Si(1)O4 tetrahedra and  an edgeedge with one Be(1)O4 tetrahedra. Ce(1) is bonded in a 9-coordinate geometry to one O(1), two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share corners with three equivalent Be(1)O4 tetrahedra. H(1) is bonded in a single-bond geometry to one O(5) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Be(1), one Ce(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted water-like geometry to one Be(1), two equivalent Ce(1), and one Si(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Ce(1) and one Si(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Ce(1) and one Si(1) atom. In the fifth O site, O(5) is bonded in a distorted water-like geometry to one Be(1), two equivalent Ce(1), and one H(1) atom. is represented by the CIF card [CIF]
data_CeBeSiHO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.880
_cell_length_b   7.406
_cell_length_c   10.213
_cell_angle_alpha   89.988
_cell_angle_beta   119.181
_cell_angle_gamma   89.993
_symmetry_Int_Tables_number   1
_cell_volume   388.277
_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
  Ce  Ce0  1  0.012  0.015  0.314  1.0
  Ce  Ce1  1  0.011  0.485  0.814  1.0
  Ce  Ce2  1  0.989  0.515  0.186  1.0
  Ce  Ce3  1  0.988  0.985  0.686  1.0
  Be  Be4  1  0.569  0.125  0.963  1.0
  Be  Be5  1  0.568  0.375  0.463  1.0
  Be  Be6  1  0.432  0.625  0.537  1.0
  Be  Be7  1  0.431  0.875  0.037  1.0
  Si  Si8  1  0.534  0.725  0.813  1.0
  Si  Si9  1  0.534  0.775  0.313  1.0
  Si  Si10  1  0.466  0.225  0.687  1.0
  Si  Si11  1  0.466  0.275  0.187  1.0
  H  H12  1  0.943  0.341  0.500  1.0
  H  H13  1  0.944  0.159  0.000  1.0
  H  H14  1  0.056  0.841  1.000  1.0
  H  H15  1  0.057  0.659  0.500  1.0
  O  O16  1  0.458  0.406  0.587  1.0
  O  O17  1  0.459  0.094  0.087  1.0
  O  O18  1  0.630  0.743  0.685  1.0
  O  O19  1  0.630  0.757  0.185  1.0
  O  O20  1  0.268  0.426  0.069  1.0
  O  O21  1  0.268  0.074  0.569  1.0
  O  O22  1  0.223  0.827  0.225  1.0
  O  O23  1  0.223  0.673  0.725  1.0
  O  O24  1  0.132  0.680  0.435  1.0
  O  O25  1  0.132  0.820  0.935  1.0
  O  O26  1  0.868  0.180  0.065  1.0
  O  O27  1  0.868  0.320  0.565  1.0
  O  O28  1  0.777  0.327  0.275  1.0
  O  O29  1  0.777  0.173  0.775  1.0
  O  O30  1  0.732  0.926  0.431  1.0
  O  O31  1  0.732  0.574  0.931  1.0
  O  O32  1  0.370  0.243  0.815  1.0
  O  O33  1  0.370  0.257  0.315  1.0
  O  O34  1  0.541  0.906  0.913  1.0
  O  O35  1  0.542  0.594  0.413  1.0
[/CIF]
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The structure described by BeCeSiHO5 crystallizes in the monoclinic P2_1/c space group. Be(1) is bonded to one O(2), one O(5), and two equivalent O(1) atoms to form BeO4 tetrahedra that share corners with three equivalent Si(1)O4 tetrahedra and  an edgeedge with one Be(1)O4 tetrahedra. Ce(1) is bonded in a 9-coordinate geometry to one O(1), two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share corners with three equivalent Be(1)O4 tetrahedra. H(1) is bonded in a single-bond geometry to one O(5) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Be(1), one Ce(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted water-like geometry to one Be(1), two equivalent Ce(1), and one Si(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Ce(1) and one Si(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Ce(1) and one Si(1) atom. In the fifth O site, O(5) is bonded in a distorted water-like geometry to one Be(1), two equivalent Ce(1), and one H(1) atom. is represented by the CIF card [CIF]
data_CeBeSiHO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.880
_cell_length_b   7.406
_cell_length_c   10.213
_cell_angle_alpha   89.988
_cell_angle_beta   119.181
_cell_angle_gamma   89.993
_symmetry_Int_Tables_number   1
_cell_volume   388.277
_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
  Ce  Ce0  1  0.012  0.015  0.314  1.0
  Ce  Ce1  1  0.011  0.485  0.814  1.0
  Ce  Ce2  1  0.989  0.515  0.186  1.0
  Ce  Ce3  1  0.988  0.985  0.686  1.0
  Be  Be4  1  0.569  0.125  0.963  1.0
  Be  Be5  1  0.568  0.375  0.463  1.0
  Be  Be6  1  0.432  0.625  0.537  1.0
  Be  Be7  1  0.431  0.875  0.037  1.0
  Si  Si8  1  0.534  0.725  0.813  1.0
  Si  Si9  1  0.534  0.775  0.313  1.0
  Si  Si10  1  0.466  0.225  0.687  1.0
  Si  Si11  1  0.466  0.275  0.187  1.0
  H  H12  1  0.943  0.341  0.500  1.0
  H  H13  1  0.944  0.159  0.000  1.0
  H  H14  1  0.056  0.841  1.000  1.0
  H  H15  1  0.057  0.659  0.500  1.0
  O  O16  1  0.458  0.406  0.587  1.0
  O  O17  1  0.459  0.094  0.087  1.0
  O  O18  1  0.630  0.743  0.685  1.0
  O  O19  1  0.630  0.757  0.185  1.0
  O  O20  1  0.268  0.426  0.069  1.0
  O  O21  1  0.268  0.074  0.569  1.0
  O  O22  1  0.223  0.827  0.225  1.0
  O  O23  1  0.223  0.673  0.725  1.0
  O  O24  1  0.132  0.680  0.435  1.0
  O  O25  1  0.132  0.820  0.935  1.0
  O  O26  1  0.868  0.180  0.065  1.0
  O  O27  1  0.868  0.320  0.565  1.0
  O  O28  1  0.777  0.327  0.275  1.0
  O  O29  1  0.777  0.173  0.775  1.0
  O  O30  1  0.732  0.926  0.431  1.0
  O  O31  1  0.732  0.574  0.931  1.0
  O  O32  1  0.370  0.243  0.815  1.0
  O  O33  1  0.370  0.257  0.315  1.0
  O  O34  1  0.541  0.906  0.913  1.0
  O  O35  1  0.542  0.594  0.413  1.0
[/CIF]
.