The compound described by CdAl4O7 crystallizes in the monoclinic C2/c space group. Cd(1) is bonded to one O(1), two equivalent O(2), and two equivalent O(3) atoms to form CdO5 trigonal bipyramids that share corners with four equivalent Al(2)O4 tetrahedra and corners with six equivalent Al(1)O4 tetrahedra. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(3), one O(4), and two equivalent O(2) atoms to form AlO4 tetrahedra that share corners with two equivalent Al(1)O4 tetrahedra, corners with three equivalent Al(2)O4 tetrahedra, and corners with three equivalent Cd(1)O5 trigonal bipyramids. In the second Al site, Al(2) is bonded to one O(1), one O(3), and two equivalent O(4) atoms to form AlO4 tetrahedra that share corners with three equivalent Al(1)O4 tetrahedra, corners with three equivalent Al(2)O4 tetrahedra, and corners with two equivalent Cd(1)O5 trigonal bipyramids. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Cd(1) and two equivalent Al(2) atoms. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Cd(1) and two equivalent Al(1) atoms. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Cd(1), one Al(1), and one Al(2) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Al(1) and two equivalent Al(2) atoms. is represented by the CIF file [CIF]
data_Al4CdO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.717
_cell_length_b   7.717
_cell_length_c   5.418
_cell_angle_alpha   77.338
_cell_angle_beta   77.338
_cell_angle_gamma   70.061
_symmetry_Int_Tables_number   1
_cell_volume   292.244
_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
  Al  Al0  1  0.925  0.758  0.315  1.0
  Al  Al1  1  0.242  0.075  0.185  1.0
  Al  Al2  1  0.075  0.242  0.685  1.0
  Al  Al3  1  0.758  0.925  0.815  1.0
  Al  Al4  1  0.316  0.439  0.238  1.0
  Al  Al5  1  0.561  0.684  0.262  1.0
  Al  Al6  1  0.684  0.561  0.762  1.0
  Al  Al7  1  0.439  0.316  0.738  1.0
  Cd  Cd8  1  0.791  0.209  0.250  1.0
  Cd  Cd9  1  0.209  0.791  0.750  1.0
  O  O10  1  0.529  0.471  0.250  1.0
  O  O11  1  0.471  0.529  0.750  1.0
  O  O12  1  0.950  0.821  0.595  1.0
  O  O13  1  0.179  0.050  0.905  1.0
  O  O14  1  0.050  0.179  0.405  1.0
  O  O15  1  0.821  0.950  0.095  1.0
  O  O16  1  0.134  0.633  0.148  1.0
  O  O17  1  0.367  0.866  0.352  1.0
  O  O18  1  0.866  0.367  0.852  1.0
  O  O19  1  0.633  0.134  0.648  1.0
  O  O20  1  0.250  0.358  0.571  1.0
  O  O21  1  0.642  0.750  0.929  1.0
  O  O22  1  0.750  0.642  0.429  1.0
  O  O23  1  0.358  0.250  0.071  1.0
[/CIF]
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The compound described by CdAl4O7 crystallizes in the monoclinic C2/c space group. Cd(1) is bonded to one O(1), two equivalent O(2), and two equivalent O(3) atoms to form CdO5 trigonal bipyramids that share corners with four equivalent Al(2)O4 tetrahedra and corners with six equivalent Al(1)O4 tetrahedra. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(3), one O(4), and two equivalent O(2) atoms to form AlO4 tetrahedra that share corners with two equivalent Al(1)O4 tetrahedra, corners with three equivalent Al(2)O4 tetrahedra, and corners with three equivalent Cd(1)O5 trigonal bipyramids. In the second Al site, Al(2) is bonded to one O(1), one O(3), and two equivalent O(4) atoms to form AlO4 tetrahedra that share corners with three equivalent Al(1)O4 tetrahedra, corners with three equivalent Al(2)O4 tetrahedra, and corners with two equivalent Cd(1)O5 trigonal bipyramids. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Cd(1) and two equivalent Al(2) atoms. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Cd(1) and two equivalent Al(1) atoms. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Cd(1), one Al(1), and one Al(2) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Al(1) and two equivalent Al(2) atoms. is represented by the CIF file [CIF]
data_Al4CdO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.717
_cell_length_b   7.717
_cell_length_c   5.418
_cell_angle_alpha   77.338
_cell_angle_beta   77.338
_cell_angle_gamma   70.061
_symmetry_Int_Tables_number   1
_cell_volume   292.244
_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
  Al  Al0  1  0.925  0.758  0.315  1.0
  Al  Al1  1  0.242  0.075  0.185  1.0
  Al  Al2  1  0.075  0.242  0.685  1.0
  Al  Al3  1  0.758  0.925  0.815  1.0
  Al  Al4  1  0.316  0.439  0.238  1.0
  Al  Al5  1  0.561  0.684  0.262  1.0
  Al  Al6  1  0.684  0.561  0.762  1.0
  Al  Al7  1  0.439  0.316  0.738  1.0
  Cd  Cd8  1  0.791  0.209  0.250  1.0
  Cd  Cd9  1  0.209  0.791  0.750  1.0
  O  O10  1  0.529  0.471  0.250  1.0
  O  O11  1  0.471  0.529  0.750  1.0
  O  O12  1  0.950  0.821  0.595  1.0
  O  O13  1  0.179  0.050  0.905  1.0
  O  O14  1  0.050  0.179  0.405  1.0
  O  O15  1  0.821  0.950  0.095  1.0
  O  O16  1  0.134  0.633  0.148  1.0
  O  O17  1  0.367  0.866  0.352  1.0
  O  O18  1  0.866  0.367  0.852  1.0
  O  O19  1  0.633  0.134  0.648  1.0
  O  O20  1  0.250  0.358  0.571  1.0
  O  O21  1  0.642  0.750  0.929  1.0
  O  O22  1  0.750  0.642  0.429  1.0
  O  O23  1  0.358  0.250  0.071  1.0
[/CIF]
.