The compound described by Be2Yb2NiSi2O10 is Esseneite-derived structured and crystallizes in the monoclinic P2_1/c space group. Be(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form BeO4 tetrahedra that share  a cornercorner with one Ni(1)O6 octahedra, corners with three equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles are 58°. Yb(1) is bonded in a 8-coordinate geometry to one O(1), one O(5), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Ni(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms to form NiO6 octahedra that share corners with two equivalent Be(1)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, and edges with two equivalent Be(1)O4 tetrahedra. Si(1) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form SiO4 tetrahedra that share corners with two equivalent Ni(1)O6 octahedra and corners with three equivalent Be(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 59°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Be(1), one Yb(1), one Ni(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Be(1), two equivalent Yb(1), and one Si(1) atom. In the third O site, O(3) is bonded to one Be(1), two equivalent Yb(1), and one Ni(1) atom to form distorted corner-sharing OYb2BeNi tetrahedra. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Yb(1) and one Si(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Be(1), one Yb(1), one Ni(1), and one Si(1) atom. is represented by the CIF card [CIF]
data_Yb2Be2Si2NiO10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.487
_cell_length_b   4.657
_cell_length_c   10.087
_cell_angle_alpha   89.366
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   351.693
_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
  Yb  Yb0  1  0.385  0.998  0.823  1.0
  Yb  Yb1  1  0.885  0.002  0.677  1.0
  Yb  Yb2  1  0.615  0.002  0.177  1.0
  Yb  Yb3  1  0.115  0.998  0.323  1.0
  Be  Be4  1  0.918  0.446  0.155  1.0
  Be  Be5  1  0.082  0.554  0.845  1.0
  Be  Be6  1  0.582  0.446  0.655  1.0
  Be  Be7  1  0.418  0.554  0.345  1.0
  Si  Si8  1  0.221  0.504  0.582  1.0
  Si  Si9  1  0.721  0.496  0.918  1.0
  Si  Si10  1  0.779  0.496  0.418  1.0
  Si  Si11  1  0.279  0.504  0.082  1.0
  Ni  Ni12  1  0.500  0.000  0.500  1.0
  Ni  Ni13  1  0.000  0.000  0.000  1.0
  O  O14  1  0.384  0.287  0.631  1.0
  O  O15  1  0.884  0.713  0.869  1.0
  O  O16  1  0.616  0.713  0.369  1.0
  O  O17  1  0.116  0.287  0.131  1.0
  O  O18  1  0.157  0.695  0.708  1.0
  O  O19  1  0.657  0.305  0.792  1.0
  O  O20  1  0.420  0.213  0.347  1.0
  O  O21  1  0.080  0.213  0.847  1.0
  O  O22  1  0.920  0.787  0.153  1.0
  O  O23  1  0.580  0.787  0.653  1.0
  O  O24  1  0.431  0.283  0.023  1.0
  O  O25  1  0.931  0.717  0.477  1.0
  O  O26  1  0.569  0.717  0.977  1.0
  O  O27  1  0.069  0.283  0.523  1.0
  O  O28  1  0.301  0.715  0.464  1.0
  O  O29  1  0.801  0.285  0.036  1.0
  O  O30  1  0.699  0.285  0.536  1.0
  O  O31  1  0.199  0.715  0.964  1.0
  O  O32  1  0.343  0.695  0.208  1.0
  O  O33  1  0.843  0.305  0.292  1.0
[/CIF]
.
The compound described by Be2Yb2NiSi2O10 is Esseneite-derived structured and crystallizes in the monoclinic P2_1/c space group. Be(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form BeO4 tetrahedra that share  a cornercorner with one Ni(1)O6 octahedra, corners with three equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles are 58°. Yb(1) is bonded in a 8-coordinate geometry to one O(1), one O(5), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Ni(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms to form NiO6 octahedra that share corners with two equivalent Be(1)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, and edges with two equivalent Be(1)O4 tetrahedra. Si(1) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form SiO4 tetrahedra that share corners with two equivalent Ni(1)O6 octahedra and corners with three equivalent Be(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 59°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Be(1), one Yb(1), one Ni(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Be(1), two equivalent Yb(1), and one Si(1) atom. In the third O site, O(3) is bonded to one Be(1), two equivalent Yb(1), and one Ni(1) atom to form distorted corner-sharing OYb2BeNi tetrahedra. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Yb(1) and one Si(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Be(1), one Yb(1), one Ni(1), and one Si(1) atom. is represented by the CIF card [CIF]
data_Yb2Be2Si2NiO10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.487
_cell_length_b   4.657
_cell_length_c   10.087
_cell_angle_alpha   89.366
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   351.693
_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
  Yb  Yb0  1  0.385  0.998  0.823  1.0
  Yb  Yb1  1  0.885  0.002  0.677  1.0
  Yb  Yb2  1  0.615  0.002  0.177  1.0
  Yb  Yb3  1  0.115  0.998  0.323  1.0
  Be  Be4  1  0.918  0.446  0.155  1.0
  Be  Be5  1  0.082  0.554  0.845  1.0
  Be  Be6  1  0.582  0.446  0.655  1.0
  Be  Be7  1  0.418  0.554  0.345  1.0
  Si  Si8  1  0.221  0.504  0.582  1.0
  Si  Si9  1  0.721  0.496  0.918  1.0
  Si  Si10  1  0.779  0.496  0.418  1.0
  Si  Si11  1  0.279  0.504  0.082  1.0
  Ni  Ni12  1  0.500  0.000  0.500  1.0
  Ni  Ni13  1  0.000  0.000  0.000  1.0
  O  O14  1  0.384  0.287  0.631  1.0
  O  O15  1  0.884  0.713  0.869  1.0
  O  O16  1  0.616  0.713  0.369  1.0
  O  O17  1  0.116  0.287  0.131  1.0
  O  O18  1  0.157  0.695  0.708  1.0
  O  O19  1  0.657  0.305  0.792  1.0
  O  O20  1  0.420  0.213  0.347  1.0
  O  O21  1  0.080  0.213  0.847  1.0
  O  O22  1  0.920  0.787  0.153  1.0
  O  O23  1  0.580  0.787  0.653  1.0
  O  O24  1  0.431  0.283  0.023  1.0
  O  O25  1  0.931  0.717  0.477  1.0
  O  O26  1  0.569  0.717  0.977  1.0
  O  O27  1  0.069  0.283  0.523  1.0
  O  O28  1  0.301  0.715  0.464  1.0
  O  O29  1  0.801  0.285  0.036  1.0
  O  O30  1  0.699  0.285  0.536  1.0
  O  O31  1  0.199  0.715  0.964  1.0
  O  O32  1  0.343  0.695  0.208  1.0
  O  O33  1  0.843  0.305  0.292  1.0
[/CIF]
.