The compound described by SrMg6SnO8 is Caswellsilverite-derived structured and crystallizes in the tetragonal P4/mmm space group. Sr(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form SrO6 octahedra that share corners with two equivalent Mg(2)O6 octahedra, corners with four equivalent Sr(1)O6 octahedra, edges with four equivalent Sn(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(1) and four equivalent O(4) atoms to form MgO6 octahedra that share corners with two equivalent Sn(1)O6 octahedra, corners with four equivalent Mg(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. 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 Sr(1)O6 octahedra, corners with four equivalent Mg(2)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. 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 Sr(1)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Mg(2)O6 octahedra, edges with two equivalent Sn(1)O6 octahedra, and edges with four equivalent Mg(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. Sn(1) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form SnO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with four equivalent Sn(1)O6 octahedra, edges with four equivalent Sr(1)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 Mg(1), four equivalent Mg(3), and one Sn(1) atom to form OMg5Sn octahedra that share corners with six equivalent O(1)Mg5Sn octahedra, edges with four equivalent O(4)Mg6 octahedra, edges with four equivalent O(3)Sr2Mg2Sn2 octahedra, and edges with four equivalent O(2)SrMg5 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the second O site, O(2) is bonded to one Sr(1), one Mg(2), and four equivalent Mg(3) atoms to form OSrMg5 octahedra that share corners with six equivalent O(2)SrMg5 octahedra, edges with four equivalent O(1)Mg5Sn octahedra, edges with four equivalent O(4)Mg6 octahedra, and edges with four equivalent O(3)Sr2Mg2Sn2 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the third O site, O(3) is bonded to two equivalent Sr(1), two equivalent Mg(3), and two equivalent Sn(1) atoms to form OSr2Mg2Sn2 octahedra that share corners with two equivalent O(4)Mg6 octahedra, corners with four equivalent O(3)Sr2Mg2Sn2 octahedra, edges with four equivalent O(1)Mg5Sn octahedra, edges with four equivalent O(3)Sr2Mg2Sn2 octahedra, and edges with four equivalent O(2)SrMg5 octahedra. The corner-sharing octahedra are not tilted. In the fourth O site, O(4) is bonded to two equivalent Mg(1), two equivalent Mg(2), and two equivalent Mg(3) atoms to form OMg6 octahedra that share corners with two equivalent O(3)Sr2Mg2Sn2 octahedra, corners with four equivalent O(4)Mg6 octahedra, edges with four equivalent O(1)Mg5Sn octahedra, edges with four equivalent O(4)Mg6 octahedra, and edges with four equivalent O(2)SrMg5 octahedra. The corner-sharing octahedra are not tilted. is represented by the CIF card [CIF]
data_SrMg6SnO8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.076
_cell_length_b   4.626
_cell_length_c   4.626
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   194.225
_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
  Sr  Sr0  1  0.000  0.500  0.500  1.0
  Mg  Mg1  1  0.500  0.000  0.000  1.0
  Mg  Mg2  1  0.500  0.500  0.500  1.0
  Mg  Mg3  1  0.273  0.000  0.500  1.0
  Mg  Mg4  1  0.727  0.000  0.500  1.0
  Mg  Mg5  1  0.273  0.500  0.000  1.0
  Mg  Mg6  1  0.727  0.500  0.000  1.0
  Sn  Sn7  1  0.000  0.000  0.000  1.0
  O  O8  1  0.277  0.000  0.000  1.0
  O  O9  1  0.723  0.000  0.000  1.0
  O  O10  1  0.275  0.500  0.500  1.0
  O  O11  1  0.725  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 compound described by SrMg6SnO8 is Caswellsilverite-derived structured and crystallizes in the tetragonal P4/mmm space group. Sr(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form SrO6 octahedra that share corners with two equivalent Mg(2)O6 octahedra, corners with four equivalent Sr(1)O6 octahedra, edges with four equivalent Sn(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(1) and four equivalent O(4) atoms to form MgO6 octahedra that share corners with two equivalent Sn(1)O6 octahedra, corners with four equivalent Mg(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. 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 Sr(1)O6 octahedra, corners with four equivalent Mg(2)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. 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 Sr(1)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Mg(2)O6 octahedra, edges with two equivalent Sn(1)O6 octahedra, and edges with four equivalent Mg(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. Sn(1) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form SnO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with four equivalent Sn(1)O6 octahedra, edges with four equivalent Sr(1)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 Mg(1), four equivalent Mg(3), and one Sn(1) atom to form OMg5Sn octahedra that share corners with six equivalent O(1)Mg5Sn octahedra, edges with four equivalent O(4)Mg6 octahedra, edges with four equivalent O(3)Sr2Mg2Sn2 octahedra, and edges with four equivalent O(2)SrMg5 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the second O site, O(2) is bonded to one Sr(1), one Mg(2), and four equivalent Mg(3) atoms to form OSrMg5 octahedra that share corners with six equivalent O(2)SrMg5 octahedra, edges with four equivalent O(1)Mg5Sn octahedra, edges with four equivalent O(4)Mg6 octahedra, and edges with four equivalent O(3)Sr2Mg2Sn2 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the third O site, O(3) is bonded to two equivalent Sr(1), two equivalent Mg(3), and two equivalent Sn(1) atoms to form OSr2Mg2Sn2 octahedra that share corners with two equivalent O(4)Mg6 octahedra, corners with four equivalent O(3)Sr2Mg2Sn2 octahedra, edges with four equivalent O(1)Mg5Sn octahedra, edges with four equivalent O(3)Sr2Mg2Sn2 octahedra, and edges with four equivalent O(2)SrMg5 octahedra. The corner-sharing octahedra are not tilted. In the fourth O site, O(4) is bonded to two equivalent Mg(1), two equivalent Mg(2), and two equivalent Mg(3) atoms to form OMg6 octahedra that share corners with two equivalent O(3)Sr2Mg2Sn2 octahedra, corners with four equivalent O(4)Mg6 octahedra, edges with four equivalent O(1)Mg5Sn octahedra, edges with four equivalent O(4)Mg6 octahedra, and edges with four equivalent O(2)SrMg5 octahedra. The corner-sharing octahedra are not tilted. is represented by the CIF card [CIF]
data_SrMg6SnO8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.076
_cell_length_b   4.626
_cell_length_c   4.626
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   194.225
_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
  Sr  Sr0  1  0.000  0.500  0.500  1.0
  Mg  Mg1  1  0.500  0.000  0.000  1.0
  Mg  Mg2  1  0.500  0.500  0.500  1.0
  Mg  Mg3  1  0.273  0.000  0.500  1.0
  Mg  Mg4  1  0.727  0.000  0.500  1.0
  Mg  Mg5  1  0.273  0.500  0.000  1.0
  Mg  Mg6  1  0.727  0.500  0.000  1.0
  Sn  Sn7  1  0.000  0.000  0.000  1.0
  O  O8  1  0.277  0.000  0.000  1.0
  O  O9  1  0.723  0.000  0.000  1.0
  O  O10  1  0.275  0.500  0.500  1.0
  O  O11  1  0.725  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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