The crystal structure described by CaMg6CdO8 is alpha Po-derived structured and crystallizes in the tetragonal P4/mmm space group. Ca(1) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form CaO6 octahedra that share corners with two equivalent Cd(1)O6 octahedra, corners with four equivalent Ca(1)O6 octahedra, edges with four equivalent Mg(1)O6 octahedra, and edges with eight equivalent Mg(3)O6 octahedra. The corner-sharing octahedra are not tilted. There are three inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form MgO6 octahedra that share corners with two equivalent Mg(2)O6 octahedra, corners with four equivalent Mg(1)O6 octahedra, edges with four equivalent Ca(1)O6 octahedra, and edges with eight equivalent Mg(3)O6 octahedra. The corner-sharing octahedra are not tilted. In the second Mg site, Mg(2) is bonded to two equivalent O(2) and four equivalent O(4) atoms to form MgO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with four equivalent Mg(2)O6 octahedra, edges with four equivalent Cd(1)O6 octahedra, and edges with eight equivalent Mg(3)O6 octahedra. The corner-sharing octahedra are not tilted. In the third Mg site, Mg(3) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form MgO6 octahedra that share corners with six equivalent Mg(3)O6 octahedra, edges with two equivalent Ca(1)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Mg(2)O6 octahedra, edges with two equivalent Cd(1)O6 octahedra, and edges with four equivalent Mg(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. Cd(1) is bonded to two equivalent O(1) and four equivalent O(4) atoms to form CdO6 octahedra that share corners with two equivalent Ca(1)O6 octahedra, corners with four equivalent Cd(1)O6 octahedra, edges with four equivalent Mg(2)O6 octahedra, and edges with eight equivalent Mg(3)O6 octahedra. The corner-sharing octahedra are not tilted. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Ca(1), four equivalent Mg(3), and one Cd(1) atom to form OCaMg4Cd octahedra that share corners with six equivalent O(1)CaMg4Cd octahedra, edges with four equivalent O(3)Ca2Mg4 octahedra, edges with four equivalent O(4)Mg4Cd2 octahedra, and edges with four equivalent O(2)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the second O site, O(2) is bonded to one Mg(1), one Mg(2), and four equivalent Mg(3) atoms to form OMg6 octahedra that share corners with six equivalent O(2)Mg6 octahedra, edges with four equivalent O(3)Ca2Mg4 octahedra, edges with four equivalent O(1)CaMg4Cd octahedra, and edges with four equivalent O(4)Mg4Cd2 octahedra. The corner-sharing octahedra are not tilted. In the third O site, O(3) is bonded to two equivalent Ca(1), two equivalent Mg(1), and two equivalent Mg(3) atoms to form OCa2Mg4 octahedra that share corners with two equivalent O(4)Mg4Cd2 octahedra, corners with four equivalent O(3)Ca2Mg4 octahedra, edges with four equivalent O(3)Ca2Mg4 octahedra, edges with four equivalent O(1)CaMg4Cd octahedra, and edges with four equivalent O(2)Mg6 octahedra. The corner-sharing octahedra are not tilted. In the fourth O site, O(4) is bonded to two equivalent Mg(2), two equivalent Mg(3), and two equivalent Cd(1) atoms to form OMg4Cd2 octahedra that share corners with two equivalent O(3)Ca2Mg4 octahedra, corners with four equivalent O(4)Mg4Cd2 octahedra, edges with four equivalent O(1)CaMg4Cd octahedra, edges with four equivalent O(4)Mg4Cd2 octahedra, and edges with four equivalent O(2)Mg6 octahedra. The corner-sharing octahedra are not tilted. is represented by the CIF file [CIF]
data_CaMg6CdO8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.893
_cell_length_b   4.454
_cell_length_c   4.454
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   176.383
_cell_formula_units_Z   1
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
  Ca  Ca0  1  0.000  0.000  0.000  1.0
  Mg  Mg1  1  0.000  0.500  0.500  1.0
  Mg  Mg2  1  0.500  0.500  0.500  1.0
  Mg  Mg3  1  0.251  0.000  0.500  1.0
  Mg  Mg4  1  0.749  0.000  0.500  1.0
  Mg  Mg5  1  0.251  0.500  0.000  1.0
  Mg  Mg6  1  0.749  0.500  0.000  1.0
  Cd  Cd7  1  0.500  0.000  0.000  1.0
  O  O8  1  0.248  0.000  0.000  1.0
  O  O9  1  0.752  0.000  0.000  1.0
  O  O10  1  0.250  0.500  0.500  1.0
  O  O11  1  0.750  0.500  0.500  1.0
  O  O12  1  0.000  0.000  0.500  1.0
  O  O13  1  0.500  0.000  0.500  1.0
  O  O14  1  0.000  0.500  0.000  1.0
  O  O15  1  0.500  0.500  0.000  1.0
[/CIF]
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The crystal structure described by CaMg6CdO8 is alpha Po-derived structured and crystallizes in the tetragonal P4/mmm space group. Ca(1) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form CaO6 octahedra that share corners with two equivalent Cd(1)O6 octahedra, corners with four equivalent Ca(1)O6 octahedra, edges with four equivalent Mg(1)O6 octahedra, and edges with eight equivalent Mg(3)O6 octahedra. The corner-sharing octahedra are not tilted. There are three inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form MgO6 octahedra that share corners with two equivalent Mg(2)O6 octahedra, corners with four equivalent Mg(1)O6 octahedra, edges with four equivalent Ca(1)O6 octahedra, and edges with eight equivalent Mg(3)O6 octahedra. The corner-sharing octahedra are not tilted. In the second Mg site, Mg(2) is bonded to two equivalent O(2) and four equivalent O(4) atoms to form MgO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with four equivalent Mg(2)O6 octahedra, edges with four equivalent Cd(1)O6 octahedra, and edges with eight equivalent Mg(3)O6 octahedra. The corner-sharing octahedra are not tilted. In the third Mg site, Mg(3) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form MgO6 octahedra that share corners with six equivalent Mg(3)O6 octahedra, edges with two equivalent Ca(1)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Mg(2)O6 octahedra, edges with two equivalent Cd(1)O6 octahedra, and edges with four equivalent Mg(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. Cd(1) is bonded to two equivalent O(1) and four equivalent O(4) atoms to form CdO6 octahedra that share corners with two equivalent Ca(1)O6 octahedra, corners with four equivalent Cd(1)O6 octahedra, edges with four equivalent Mg(2)O6 octahedra, and edges with eight equivalent Mg(3)O6 octahedra. The corner-sharing octahedra are not tilted. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Ca(1), four equivalent Mg(3), and one Cd(1) atom to form OCaMg4Cd octahedra that share corners with six equivalent O(1)CaMg4Cd octahedra, edges with four equivalent O(3)Ca2Mg4 octahedra, edges with four equivalent O(4)Mg4Cd2 octahedra, and edges with four equivalent O(2)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the second O site, O(2) is bonded to one Mg(1), one Mg(2), and four equivalent Mg(3) atoms to form OMg6 octahedra that share corners with six equivalent O(2)Mg6 octahedra, edges with four equivalent O(3)Ca2Mg4 octahedra, edges with four equivalent O(1)CaMg4Cd octahedra, and edges with four equivalent O(4)Mg4Cd2 octahedra. The corner-sharing octahedra are not tilted. In the third O site, O(3) is bonded to two equivalent Ca(1), two equivalent Mg(1), and two equivalent Mg(3) atoms to form OCa2Mg4 octahedra that share corners with two equivalent O(4)Mg4Cd2 octahedra, corners with four equivalent O(3)Ca2Mg4 octahedra, edges with four equivalent O(3)Ca2Mg4 octahedra, edges with four equivalent O(1)CaMg4Cd octahedra, and edges with four equivalent O(2)Mg6 octahedra. The corner-sharing octahedra are not tilted. In the fourth O site, O(4) is bonded to two equivalent Mg(2), two equivalent Mg(3), and two equivalent Cd(1) atoms to form OMg4Cd2 octahedra that share corners with two equivalent O(3)Ca2Mg4 octahedra, corners with four equivalent O(4)Mg4Cd2 octahedra, edges with four equivalent O(1)CaMg4Cd octahedra, edges with four equivalent O(4)Mg4Cd2 octahedra, and edges with four equivalent O(2)Mg6 octahedra. The corner-sharing octahedra are not tilted. is represented by the CIF file [CIF]
data_CaMg6CdO8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.893
_cell_length_b   4.454
_cell_length_c   4.454
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   176.383
_cell_formula_units_Z   1
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
  Ca  Ca0  1  0.000  0.000  0.000  1.0
  Mg  Mg1  1  0.000  0.500  0.500  1.0
  Mg  Mg2  1  0.500  0.500  0.500  1.0
  Mg  Mg3  1  0.251  0.000  0.500  1.0
  Mg  Mg4  1  0.749  0.000  0.500  1.0
  Mg  Mg5  1  0.251  0.500  0.000  1.0
  Mg  Mg6  1  0.749  0.500  0.000  1.0
  Cd  Cd7  1  0.500  0.000  0.000  1.0
  O  O8  1  0.248  0.000  0.000  1.0
  O  O9  1  0.752  0.000  0.000  1.0
  O  O10  1  0.250  0.500  0.500  1.0
  O  O11  1  0.750  0.500  0.500  1.0
  O  O12  1  0.000  0.000  0.500  1.0
  O  O13  1  0.500  0.000  0.500  1.0
  O  O14  1  0.000  0.500  0.000  1.0
  O  O15  1  0.500  0.500  0.000  1.0
[/CIF]
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