The material structure described by Lu2Si2O7 crystallizes in the tetragonal P4_12_12 space group. Lu(1) is bonded to two equivalent O(1), two equivalent O(4), and three equivalent O(2) atoms to form distorted LuO7 pentagonal bipyramids that share corners with five equivalent Si(1)O4 tetrahedra, edges with five equivalent Lu(1)O7 pentagonal bipyramids, and  an edgeedge with one Si(1)O4 tetrahedra. 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 five equivalent Lu(1)O7 pentagonal bipyramids,  a cornercorner with one Si(1)O4 tetrahedra, and  an edgeedge with one Lu(1)O7 pentagonal bipyramid. There are four inequivalent O sites. In the first O site, O(3) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the second O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Lu(1) and one Si(1) atom. In the third O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Lu(1) and one Si(1) atom. In the fourth O site, O(2) is bonded to three equivalent Lu(1) and one Si(1) atom to form a mixture of distorted corner and edge-sharing OLu3Si trigonal pyramids. is represented by the CIF card [CIF]
data_Lu2Si2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.493
_cell_length_b   6.493
_cell_length_c   11.846
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   499.436
_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
  Lu  Lu0  1  0.648  0.125  0.366  1.0
  Lu  Lu1  1  0.352  0.875  0.866  1.0
  Lu  Lu2  1  0.125  0.648  0.634  1.0
  Lu  Lu3  1  0.625  0.852  0.116  1.0
  Lu  Lu4  1  0.375  0.148  0.616  1.0
  Lu  Lu5  1  0.852  0.625  0.884  1.0
  Lu  Lu6  1  0.148  0.375  0.384  1.0
  Lu  Lu7  1  0.875  0.352  0.134  1.0
  Si  Si8  1  0.847  0.099  0.879  1.0
  Si  Si9  1  0.153  0.901  0.379  1.0
  Si  Si10  1  0.099  0.847  0.121  1.0
  Si  Si11  1  0.599  0.653  0.629  1.0
  Si  Si12  1  0.401  0.347  0.129  1.0
  Si  Si13  1  0.653  0.599  0.371  1.0
  Si  Si14  1  0.347  0.401  0.871  1.0
  Si  Si15  1  0.901  0.153  0.621  1.0
  O  O16  1  0.861  0.309  0.953  1.0
  O  O17  1  0.139  0.691  0.453  1.0
  O  O18  1  0.309  0.861  0.047  1.0
  O  O19  1  0.809  0.639  0.703  1.0
  O  O20  1  0.191  0.361  0.203  1.0
  O  O21  1  0.639  0.809  0.297  1.0
  O  O22  1  0.361  0.191  0.797  1.0
  O  O23  1  0.691  0.139  0.547  1.0
  O  O24  1  0.664  0.945  0.927  1.0
  O  O25  1  0.336  0.055  0.427  1.0
  O  O26  1  0.945  0.664  0.073  1.0
  O  O27  1  0.445  0.836  0.677  1.0
  O  O28  1  0.555  0.164  0.177  1.0
  O  O29  1  0.836  0.445  0.323  1.0
  O  O30  1  0.164  0.555  0.823  1.0
  O  O31  1  0.055  0.336  0.573  1.0
  O  O32  1  0.815  0.185  0.750  1.0
  O  O33  1  0.315  0.315  0.000  1.0
  O  O34  1  0.685  0.685  0.500  1.0
  O  O35  1  0.185  0.815  0.250  1.0
  O  O36  1  0.069  0.970  0.624  1.0
  O  O37  1  0.530  0.569  0.874  1.0
  O  O38  1  0.470  0.431  0.374  1.0
  O  O39  1  0.569  0.530  0.126  1.0
  O  O40  1  0.431  0.470  0.626  1.0
  O  O41  1  0.931  0.030  0.124  1.0
  O  O42  1  0.970  0.069  0.376  1.0
  O  O43  1  0.030  0.931  0.876  1.0
[/CIF]
.
The material structure described by Lu2Si2O7 crystallizes in the tetragonal P4_12_12 space group. Lu(1) is bonded to two equivalent O(1), two equivalent O(4), and three equivalent O(2) atoms to form distorted LuO7 pentagonal bipyramids that share corners with five equivalent Si(1)O4 tetrahedra, edges with five equivalent Lu(1)O7 pentagonal bipyramids, and  an edgeedge with one Si(1)O4 tetrahedra. 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 five equivalent Lu(1)O7 pentagonal bipyramids,  a cornercorner with one Si(1)O4 tetrahedra, and  an edgeedge with one Lu(1)O7 pentagonal bipyramid. There are four inequivalent O sites. In the first O site, O(3) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the second O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Lu(1) and one Si(1) atom. In the third O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Lu(1) and one Si(1) atom. In the fourth O site, O(2) is bonded to three equivalent Lu(1) and one Si(1) atom to form a mixture of distorted corner and edge-sharing OLu3Si trigonal pyramids. is represented by the CIF card [CIF]
data_Lu2Si2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.493
_cell_length_b   6.493
_cell_length_c   11.846
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   499.436
_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
  Lu  Lu0  1  0.648  0.125  0.366  1.0
  Lu  Lu1  1  0.352  0.875  0.866  1.0
  Lu  Lu2  1  0.125  0.648  0.634  1.0
  Lu  Lu3  1  0.625  0.852  0.116  1.0
  Lu  Lu4  1  0.375  0.148  0.616  1.0
  Lu  Lu5  1  0.852  0.625  0.884  1.0
  Lu  Lu6  1  0.148  0.375  0.384  1.0
  Lu  Lu7  1  0.875  0.352  0.134  1.0
  Si  Si8  1  0.847  0.099  0.879  1.0
  Si  Si9  1  0.153  0.901  0.379  1.0
  Si  Si10  1  0.099  0.847  0.121  1.0
  Si  Si11  1  0.599  0.653  0.629  1.0
  Si  Si12  1  0.401  0.347  0.129  1.0
  Si  Si13  1  0.653  0.599  0.371  1.0
  Si  Si14  1  0.347  0.401  0.871  1.0
  Si  Si15  1  0.901  0.153  0.621  1.0
  O  O16  1  0.861  0.309  0.953  1.0
  O  O17  1  0.139  0.691  0.453  1.0
  O  O18  1  0.309  0.861  0.047  1.0
  O  O19  1  0.809  0.639  0.703  1.0
  O  O20  1  0.191  0.361  0.203  1.0
  O  O21  1  0.639  0.809  0.297  1.0
  O  O22  1  0.361  0.191  0.797  1.0
  O  O23  1  0.691  0.139  0.547  1.0
  O  O24  1  0.664  0.945  0.927  1.0
  O  O25  1  0.336  0.055  0.427  1.0
  O  O26  1  0.945  0.664  0.073  1.0
  O  O27  1  0.445  0.836  0.677  1.0
  O  O28  1  0.555  0.164  0.177  1.0
  O  O29  1  0.836  0.445  0.323  1.0
  O  O30  1  0.164  0.555  0.823  1.0
  O  O31  1  0.055  0.336  0.573  1.0
  O  O32  1  0.815  0.185  0.750  1.0
  O  O33  1  0.315  0.315  0.000  1.0
  O  O34  1  0.685  0.685  0.500  1.0
  O  O35  1  0.185  0.815  0.250  1.0
  O  O36  1  0.069  0.970  0.624  1.0
  O  O37  1  0.530  0.569  0.874  1.0
  O  O38  1  0.470  0.431  0.374  1.0
  O  O39  1  0.569  0.530  0.126  1.0
  O  O40  1  0.431  0.470  0.626  1.0
  O  O41  1  0.931  0.030  0.124  1.0
  O  O42  1  0.970  0.069  0.376  1.0
  O  O43  1  0.030  0.931  0.876  1.0
[/CIF]
.