The material structure described by Ce2Si2O7 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 8-coordinate geometry to one O(2), one O(4), one O(5), one O(6), two equivalent O(3), and two equivalent O(7) atoms. In the second Ce site, Ce(2) is bonded in a 8-coordinate geometry to one O(3), one O(4), one O(6), one O(7), two equivalent O(2), and two equivalent O(5) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(5), and one O(6) atom to form corner-sharing SiO4 tetrahedra. In the second Si site, Si(2) is bonded to one O(1), one O(3), one O(4), and one O(7) atom to form corner-sharing SiO4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Si(1) and one Si(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ce(1), two equivalent Ce(2), and one Si(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ce(2), two equivalent Ce(1), and one Si(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Ce(1), one Ce(2), and one Si(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Ce(1), two equivalent Ce(2), and one Si(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Ce(1), one Ce(2), and one Si(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Ce(2), two equivalent Ce(1), and one Si(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ce2Si2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.825
_cell_length_b   5.466
_cell_length_c   14.361
_cell_angle_alpha   67.754
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   641.166
_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  0.893  0.347  0.911  1.0
  Ce  Ce1  1  0.693  0.023  0.733  1.0
  Ce  Ce2  1  0.607  0.347  0.411  1.0
  Ce  Ce3  1  0.307  0.977  0.267  1.0
  Ce  Ce4  1  0.107  0.653  0.089  1.0
  Ce  Ce5  1  0.393  0.653  0.589  1.0
  Ce  Ce6  1  0.193  0.977  0.767  1.0
  Ce  Ce7  1  0.807  0.023  0.233  1.0
  Si  Si8  1  0.493  0.412  0.820  1.0
  Si  Si9  1  0.255  0.293  0.473  1.0
  Si  Si10  1  0.007  0.412  0.320  1.0
  Si  Si11  1  0.755  0.707  0.027  1.0
  Si  Si12  1  0.993  0.588  0.680  1.0
  Si  Si13  1  0.507  0.588  0.180  1.0
  Si  Si14  1  0.745  0.707  0.527  1.0
  Si  Si15  1  0.245  0.293  0.973  1.0
  O  O16  1  0.078  0.330  0.434  1.0
  O  O17  1  0.582  0.758  0.242  1.0
  O  O18  1  0.355  0.573  0.421  1.0
  O  O19  1  0.645  0.427  0.579  1.0
  O  O20  1  0.767  0.772  0.906  1.0
  O  O21  1  0.082  0.242  0.258  1.0
  O  O22  1  0.145  0.573  0.921  1.0
  O  O23  1  0.966  0.270  0.747  1.0
  O  O24  1  0.578  0.670  0.066  1.0
  O  O25  1  0.418  0.242  0.758  1.0
  O  O26  1  0.233  0.228  0.094  1.0
  O  O27  1  0.673  0.334  0.827  1.0
  O  O28  1  0.654  0.928  0.559  1.0
  O  O29  1  0.855  0.427  0.079  1.0
  O  O30  1  0.466  0.730  0.753  1.0
  O  O31  1  0.534  0.270  0.247  1.0
  O  O32  1  0.154  0.072  0.941  1.0
  O  O33  1  0.346  0.072  0.441  1.0
  O  O34  1  0.922  0.670  0.566  1.0
  O  O35  1  0.733  0.772  0.406  1.0
  O  O36  1  0.327  0.666  0.173  1.0
  O  O37  1  0.173  0.666  0.673  1.0
  O  O38  1  0.422  0.330  0.934  1.0
  O  O39  1  0.267  0.228  0.594  1.0
  O  O40  1  0.827  0.334  0.327  1.0
  O  O41  1  0.918  0.758  0.742  1.0
  O  O42  1  0.846  0.928  0.059  1.0
  O  O43  1  0.034  0.730  0.253  1.0
[/CIF]
.
The material structure described by Ce2Si2O7 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 8-coordinate geometry to one O(2), one O(4), one O(5), one O(6), two equivalent O(3), and two equivalent O(7) atoms. In the second Ce site, Ce(2) is bonded in a 8-coordinate geometry to one O(3), one O(4), one O(6), one O(7), two equivalent O(2), and two equivalent O(5) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(5), and one O(6) atom to form corner-sharing SiO4 tetrahedra. In the second Si site, Si(2) is bonded to one O(1), one O(3), one O(4), and one O(7) atom to form corner-sharing SiO4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Si(1) and one Si(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ce(1), two equivalent Ce(2), and one Si(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ce(2), two equivalent Ce(1), and one Si(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Ce(1), one Ce(2), and one Si(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Ce(1), two equivalent Ce(2), and one Si(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Ce(1), one Ce(2), and one Si(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Ce(2), two equivalent Ce(1), and one Si(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ce2Si2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.825
_cell_length_b   5.466
_cell_length_c   14.361
_cell_angle_alpha   67.754
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   641.166
_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  0.893  0.347  0.911  1.0
  Ce  Ce1  1  0.693  0.023  0.733  1.0
  Ce  Ce2  1  0.607  0.347  0.411  1.0
  Ce  Ce3  1  0.307  0.977  0.267  1.0
  Ce  Ce4  1  0.107  0.653  0.089  1.0
  Ce  Ce5  1  0.393  0.653  0.589  1.0
  Ce  Ce6  1  0.193  0.977  0.767  1.0
  Ce  Ce7  1  0.807  0.023  0.233  1.0
  Si  Si8  1  0.493  0.412  0.820  1.0
  Si  Si9  1  0.255  0.293  0.473  1.0
  Si  Si10  1  0.007  0.412  0.320  1.0
  Si  Si11  1  0.755  0.707  0.027  1.0
  Si  Si12  1  0.993  0.588  0.680  1.0
  Si  Si13  1  0.507  0.588  0.180  1.0
  Si  Si14  1  0.745  0.707  0.527  1.0
  Si  Si15  1  0.245  0.293  0.973  1.0
  O  O16  1  0.078  0.330  0.434  1.0
  O  O17  1  0.582  0.758  0.242  1.0
  O  O18  1  0.355  0.573  0.421  1.0
  O  O19  1  0.645  0.427  0.579  1.0
  O  O20  1  0.767  0.772  0.906  1.0
  O  O21  1  0.082  0.242  0.258  1.0
  O  O22  1  0.145  0.573  0.921  1.0
  O  O23  1  0.966  0.270  0.747  1.0
  O  O24  1  0.578  0.670  0.066  1.0
  O  O25  1  0.418  0.242  0.758  1.0
  O  O26  1  0.233  0.228  0.094  1.0
  O  O27  1  0.673  0.334  0.827  1.0
  O  O28  1  0.654  0.928  0.559  1.0
  O  O29  1  0.855  0.427  0.079  1.0
  O  O30  1  0.466  0.730  0.753  1.0
  O  O31  1  0.534  0.270  0.247  1.0
  O  O32  1  0.154  0.072  0.941  1.0
  O  O33  1  0.346  0.072  0.441  1.0
  O  O34  1  0.922  0.670  0.566  1.0
  O  O35  1  0.733  0.772  0.406  1.0
  O  O36  1  0.327  0.666  0.173  1.0
  O  O37  1  0.173  0.666  0.673  1.0
  O  O38  1  0.422  0.330  0.934  1.0
  O  O39  1  0.267  0.228  0.594  1.0
  O  O40  1  0.827  0.334  0.327  1.0
  O  O41  1  0.918  0.758  0.742  1.0
  O  O42  1  0.846  0.928  0.059  1.0
  O  O43  1  0.034  0.730  0.253  1.0
[/CIF]
.