The crystal structure described by Cd4Si4O9 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded in a distorted T-shaped geometry to one O(2), one O(4), and one O(5) atom. In the second Cd site, Cd(2) is bonded in a 3-coordinate geometry to one O(2), one O(4), and one O(5) atom. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing SiO4 tetrahedra. In the second Si site, Si(2) is bonded in a water-like geometry to one O(3) and one O(5) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to two equivalent Si(1) atoms. In the second O site, O(2) is bonded in a trigonal planar geometry to one Cd(1), one Cd(2), and one Si(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Cd(1), one Cd(2), and one Si(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Cd(1), one Cd(2), and one Si(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Cd4Si4O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.143
_cell_length_b   8.197
_cell_length_c   11.183
_cell_angle_alpha   90.000
_cell_angle_beta   97.229
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   558.622
_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
  Cd  Cd0  1  0.788  0.829  0.852  1.0
  Cd  Cd1  1  0.212  0.329  0.648  1.0
  Cd  Cd2  1  0.212  0.171  0.148  1.0
  Cd  Cd3  1  0.788  0.671  0.352  1.0
  Cd  Cd4  1  0.733  0.388  0.915  1.0
  Cd  Cd5  1  0.267  0.888  0.585  1.0
  Cd  Cd6  1  0.267  0.612  0.085  1.0
  Cd  Cd7  1  0.733  0.112  0.415  1.0
  Si  Si8  1  0.693  0.055  0.109  1.0
  Si  Si9  1  0.307  0.555  0.391  1.0
  Si  Si10  1  0.307  0.945  0.891  1.0
  Si  Si11  1  0.693  0.445  0.609  1.0
  Si  Si12  1  0.856  0.686  0.123  1.0
  Si  Si13  1  0.144  0.186  0.377  1.0
  Si  Si14  1  0.144  0.314  0.877  1.0
  Si  Si15  1  0.856  0.814  0.623  1.0
  O  O16  1  0.500  0.000  0.000  1.0
  O  O17  1  0.500  0.500  0.500  1.0
  O  O18  1  0.858  0.184  0.056  1.0
  O  O19  1  0.142  0.684  0.444  1.0
  O  O20  1  0.142  0.816  0.944  1.0
  O  O21  1  0.858  0.316  0.556  1.0
  O  O22  1  0.837  0.886  0.147  1.0
  O  O23  1  0.163  0.386  0.353  1.0
  O  O24  1  0.163  0.114  0.853  1.0
  O  O25  1  0.837  0.614  0.647  1.0
  O  O26  1  0.571  0.116  0.222  1.0
  O  O27  1  0.429  0.616  0.278  1.0
  O  O28  1  0.429  0.884  0.778  1.0
  O  O29  1  0.571  0.384  0.722  1.0
  O  O30  1  0.314  0.362  0.998  1.0
  O  O31  1  0.686  0.862  0.502  1.0
  O  O32  1  0.686  0.638  0.002  1.0
  O  O33  1  0.314  0.138  0.498  1.0
[/CIF]
.
The crystal structure described by Cd4Si4O9 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded in a distorted T-shaped geometry to one O(2), one O(4), and one O(5) atom. In the second Cd site, Cd(2) is bonded in a 3-coordinate geometry to one O(2), one O(4), and one O(5) atom. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing SiO4 tetrahedra. In the second Si site, Si(2) is bonded in a water-like geometry to one O(3) and one O(5) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to two equivalent Si(1) atoms. In the second O site, O(2) is bonded in a trigonal planar geometry to one Cd(1), one Cd(2), and one Si(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Cd(1), one Cd(2), and one Si(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Cd(1), one Cd(2), and one Si(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Cd4Si4O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.143
_cell_length_b   8.197
_cell_length_c   11.183
_cell_angle_alpha   90.000
_cell_angle_beta   97.229
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   558.622
_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
  Cd  Cd0  1  0.788  0.829  0.852  1.0
  Cd  Cd1  1  0.212  0.329  0.648  1.0
  Cd  Cd2  1  0.212  0.171  0.148  1.0
  Cd  Cd3  1  0.788  0.671  0.352  1.0
  Cd  Cd4  1  0.733  0.388  0.915  1.0
  Cd  Cd5  1  0.267  0.888  0.585  1.0
  Cd  Cd6  1  0.267  0.612  0.085  1.0
  Cd  Cd7  1  0.733  0.112  0.415  1.0
  Si  Si8  1  0.693  0.055  0.109  1.0
  Si  Si9  1  0.307  0.555  0.391  1.0
  Si  Si10  1  0.307  0.945  0.891  1.0
  Si  Si11  1  0.693  0.445  0.609  1.0
  Si  Si12  1  0.856  0.686  0.123  1.0
  Si  Si13  1  0.144  0.186  0.377  1.0
  Si  Si14  1  0.144  0.314  0.877  1.0
  Si  Si15  1  0.856  0.814  0.623  1.0
  O  O16  1  0.500  0.000  0.000  1.0
  O  O17  1  0.500  0.500  0.500  1.0
  O  O18  1  0.858  0.184  0.056  1.0
  O  O19  1  0.142  0.684  0.444  1.0
  O  O20  1  0.142  0.816  0.944  1.0
  O  O21  1  0.858  0.316  0.556  1.0
  O  O22  1  0.837  0.886  0.147  1.0
  O  O23  1  0.163  0.386  0.353  1.0
  O  O24  1  0.163  0.114  0.853  1.0
  O  O25  1  0.837  0.614  0.647  1.0
  O  O26  1  0.571  0.116  0.222  1.0
  O  O27  1  0.429  0.616  0.278  1.0
  O  O28  1  0.429  0.884  0.778  1.0
  O  O29  1  0.571  0.384  0.722  1.0
  O  O30  1  0.314  0.362  0.998  1.0
  O  O31  1  0.686  0.862  0.502  1.0
  O  O32  1  0.686  0.638  0.002  1.0
  O  O33  1  0.314  0.138  0.498  1.0
[/CIF]
.