The structure described by Ba2Ge5Si3O18 crystallizes in the hexagonal P-6 space group. Ba(1) is bonded in a 6-coordinate geometry to three equivalent O(1) and three equivalent O(2) atoms. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form GeO6 octahedra that share corners with three equivalent Ge(2)O4 tetrahedra and corners with three equivalent Si(1)O4 tetrahedra. In the second Ge site, Ge(2) is bonded to two equivalent O(2) and two equivalent O(4) atoms to form GeO4 tetrahedra that share corners with two equivalent Ge(1)O6 octahedra and corners with two equivalent Ge(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 49°. Si(1) is bonded to two equivalent O(1) and two equivalent O(3) atoms to form SiO4 tetrahedra that share corners with two equivalent Ge(1)O6 octahedra and corners with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 44°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Ba(1), one Ge(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Ba(1), one Ge(1), and one Ge(2) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to two equivalent Si(1) atoms. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to two equivalent Ge(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ba2Si3Ge5O18
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.772
_cell_length_b   6.772
_cell_length_c   9.860
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   391.602
_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
  Ba  Ba0  1  0.667  0.333  0.751  1.0
  Ba  Ba1  1  0.667  0.333  0.249  1.0
  Si  Si2  1  0.252  0.376  0.000  1.0
  Si  Si3  1  0.124  0.748  0.000  1.0
  Si  Si4  1  0.624  0.876  0.000  1.0
  Ge  Ge5  1  0.000  0.000  0.758  1.0
  Ge  Ge6  1  0.000  0.000  0.242  1.0
  Ge  Ge7  1  0.119  0.357  0.500  1.0
  Ge  Ge8  1  0.643  0.762  0.500  1.0
  Ge  Ge9  1  0.238  0.881  0.500  1.0
  O  O10  1  0.236  0.236  0.863  1.0
  O  O11  1  0.000  0.764  0.863  1.0
  O  O12  1  0.764  1.000  0.863  1.0
  O  O13  1  0.236  0.236  0.137  1.0
  O  O14  1  0.000  0.764  0.137  1.0
  O  O15  1  0.764  1.000  0.137  1.0
  O  O16  1  0.975  0.218  0.352  1.0
  O  O17  1  0.782  0.757  0.352  1.0
  O  O18  1  0.243  0.025  0.352  1.0
  O  O19  1  0.975  0.218  0.648  1.0
  O  O20  1  0.782  0.757  0.648  1.0
  O  O21  1  0.243  0.025  0.648  1.0
  O  O22  1  0.077  0.481  0.000  1.0
  O  O23  1  0.404  0.923  0.000  1.0
  O  O24  1  0.519  0.596  0.000  1.0
  O  O25  1  0.418  0.467  0.500  1.0
  O  O26  1  0.533  0.950  0.500  1.0
  O  O27  1  0.050  0.582  0.500  1.0
[/CIF]
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The structure described by Ba2Ge5Si3O18 crystallizes in the hexagonal P-6 space group. Ba(1) is bonded in a 6-coordinate geometry to three equivalent O(1) and three equivalent O(2) atoms. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form GeO6 octahedra that share corners with three equivalent Ge(2)O4 tetrahedra and corners with three equivalent Si(1)O4 tetrahedra. In the second Ge site, Ge(2) is bonded to two equivalent O(2) and two equivalent O(4) atoms to form GeO4 tetrahedra that share corners with two equivalent Ge(1)O6 octahedra and corners with two equivalent Ge(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 49°. Si(1) is bonded to two equivalent O(1) and two equivalent O(3) atoms to form SiO4 tetrahedra that share corners with two equivalent Ge(1)O6 octahedra and corners with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 44°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Ba(1), one Ge(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Ba(1), one Ge(1), and one Ge(2) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to two equivalent Si(1) atoms. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to two equivalent Ge(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ba2Si3Ge5O18
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.772
_cell_length_b   6.772
_cell_length_c   9.860
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   391.602
_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
  Ba  Ba0  1  0.667  0.333  0.751  1.0
  Ba  Ba1  1  0.667  0.333  0.249  1.0
  Si  Si2  1  0.252  0.376  0.000  1.0
  Si  Si3  1  0.124  0.748  0.000  1.0
  Si  Si4  1  0.624  0.876  0.000  1.0
  Ge  Ge5  1  0.000  0.000  0.758  1.0
  Ge  Ge6  1  0.000  0.000  0.242  1.0
  Ge  Ge7  1  0.119  0.357  0.500  1.0
  Ge  Ge8  1  0.643  0.762  0.500  1.0
  Ge  Ge9  1  0.238  0.881  0.500  1.0
  O  O10  1  0.236  0.236  0.863  1.0
  O  O11  1  0.000  0.764  0.863  1.0
  O  O12  1  0.764  1.000  0.863  1.0
  O  O13  1  0.236  0.236  0.137  1.0
  O  O14  1  0.000  0.764  0.137  1.0
  O  O15  1  0.764  1.000  0.137  1.0
  O  O16  1  0.975  0.218  0.352  1.0
  O  O17  1  0.782  0.757  0.352  1.0
  O  O18  1  0.243  0.025  0.352  1.0
  O  O19  1  0.975  0.218  0.648  1.0
  O  O20  1  0.782  0.757  0.648  1.0
  O  O21  1  0.243  0.025  0.648  1.0
  O  O22  1  0.077  0.481  0.000  1.0
  O  O23  1  0.404  0.923  0.000  1.0
  O  O24  1  0.519  0.596  0.000  1.0
  O  O25  1  0.418  0.467  0.500  1.0
  O  O26  1  0.533  0.950  0.500  1.0
  O  O27  1  0.050  0.582  0.500  1.0
[/CIF]
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