The material structure described by MgGeO3 crystallizes in the orthorhombic Cmcm space group. Mg(1) is bonded in a 8-coordinate geometry to two equivalent O(2) and six equivalent O(1) atoms. Ge(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form a mixture of edge and corner-sharing GeO6 octahedra. The corner-sharing octahedral tilt angles are 48°. There are two inequivalent O sites. In the first O site, O(1) is bonded to three equivalent Mg(1) and two equivalent Ge(1) atoms to form distorted OMg3Ge2 trigonal bipyramids that share corners with four equivalent O(2)Mg2Ge2 tetrahedra, corners with nine equivalent O(1)Mg3Ge2 trigonal bipyramids, edges with three equivalent O(2)Mg2Ge2 tetrahedra, and edges with six equivalent O(1)Mg3Ge2 trigonal bipyramids. In the second O site, O(2) is bonded to two equivalent Mg(1) and two equivalent Ge(1) atoms to form OMg2Ge2 tetrahedra that share corners with four equivalent O(2)Mg2Ge2 tetrahedra, corners with eight equivalent O(1)Mg3Ge2 trigonal bipyramids, and edges with six equivalent O(1)Mg3Ge2 trigonal bipyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_MgGeO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.881
_cell_length_b   4.881
_cell_length_c   6.934
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   146.492
_symmetry_Int_Tables_number   1
_cell_volume   91.204
_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
  Mg  Mg0  1  0.260  0.740  0.250  1.0
  Mg  Mg1  1  0.740  0.260  0.750  1.0
  Ge  Ge2  1  0.000  0.000  0.500  1.0
  Ge  Ge3  1  0.000  0.000  0.000  1.0
  O  O4  1  0.369  0.631  0.940  1.0
  O  O5  1  0.631  0.369  0.060  1.0
  O  O6  1  0.631  0.369  0.440  1.0
  O  O7  1  0.369  0.631  0.560  1.0
  O  O8  1  0.083  0.917  0.750  1.0
  O  O9  1  0.917  0.083  0.250  1.0
[/CIF]
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The material structure described by MgGeO3 crystallizes in the orthorhombic Cmcm space group. Mg(1) is bonded in a 8-coordinate geometry to two equivalent O(2) and six equivalent O(1) atoms. Ge(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form a mixture of edge and corner-sharing GeO6 octahedra. The corner-sharing octahedral tilt angles are 48°. There are two inequivalent O sites. In the first O site, O(1) is bonded to three equivalent Mg(1) and two equivalent Ge(1) atoms to form distorted OMg3Ge2 trigonal bipyramids that share corners with four equivalent O(2)Mg2Ge2 tetrahedra, corners with nine equivalent O(1)Mg3Ge2 trigonal bipyramids, edges with three equivalent O(2)Mg2Ge2 tetrahedra, and edges with six equivalent O(1)Mg3Ge2 trigonal bipyramids. In the second O site, O(2) is bonded to two equivalent Mg(1) and two equivalent Ge(1) atoms to form OMg2Ge2 tetrahedra that share corners with four equivalent O(2)Mg2Ge2 tetrahedra, corners with eight equivalent O(1)Mg3Ge2 trigonal bipyramids, and edges with six equivalent O(1)Mg3Ge2 trigonal bipyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_MgGeO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.881
_cell_length_b   4.881
_cell_length_c   6.934
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   146.492
_symmetry_Int_Tables_number   1
_cell_volume   91.204
_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
  Mg  Mg0  1  0.260  0.740  0.250  1.0
  Mg  Mg1  1  0.740  0.260  0.750  1.0
  Ge  Ge2  1  0.000  0.000  0.500  1.0
  Ge  Ge3  1  0.000  0.000  0.000  1.0
  O  O4  1  0.369  0.631  0.940  1.0
  O  O5  1  0.631  0.369  0.060  1.0
  O  O6  1  0.631  0.369  0.440  1.0
  O  O7  1  0.369  0.631  0.560  1.0
  O  O8  1  0.083  0.917  0.750  1.0
  O  O9  1  0.917  0.083  0.250  1.0
[/CIF]
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