The material described by BaGe2O5 crystallizes in the orthorhombic Cmce space group. Ba(1) is bonded to one O(3), two equivalent O(2), three equivalent O(4), and six equivalent O(1) atoms to form BaO12 cuboctahedra that share corners with eight equivalent Ba(1)O12 cuboctahedra, corners with four equivalent Ge(1)O4 tetrahedra,  an edgeedge with one Ge(2)O6 octahedra, edges with three equivalent Ge(1)O4 tetrahedra, faces with three equivalent Ba(1)O12 cuboctahedra, and faces with four equivalent Ge(2)O6 octahedra. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(3), one O(4), and two equivalent O(1) atoms to form GeO4 tetrahedra that share corners with four equivalent Ba(1)O12 cuboctahedra, corners with four equivalent Ge(2)O6 octahedra, and edges with three equivalent Ba(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 55-64°. In the second Ge site, Ge(2) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form GeO6 octahedra that share corners with two equivalent Ge(2)O6 octahedra, corners with four equivalent Ge(1)O4 tetrahedra,  an edgeedge with one Ba(1)O12 cuboctahedra, and faces with four equivalent Ba(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 48°. There are four inequivalent O sites. In the first O site, O(2) is bonded in a distorted bent 120 degrees geometry to two equivalent Ba(1) and two equivalent Ge(2) atoms. In the second O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one Ge(1), and one Ge(2) atom. In the third O site, O(4) is bonded in a distorted bent 120 degrees geometry to three equivalent Ba(1), one Ge(1), and one Ge(2) atom. In the fourth O site, O(1) is bonded in a distorted bent 120 degrees geometry to three equivalent Ba(1), one Ge(1), and one Ge(2) atom. is represented by the CIF file [CIF]
data_BaGe2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.743
_cell_length_b   5.743
_cell_length_c   14.612
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   121.445
_symmetry_Int_Tables_number   1
_cell_volume   411.126
_cell_formula_units_Z   4
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  0.162  0.838  0.581  1.0
  Ba  Ba1  1  0.838  0.162  0.419  1.0
  Ba  Ba2  1  0.338  0.662  0.081  1.0
  Ba  Ba3  1  0.662  0.338  0.919  1.0
  Ge  Ge4  1  0.495  0.505  0.642  1.0
  Ge  Ge5  1  0.505  0.495  0.358  1.0
  Ge  Ge6  1  0.005  0.995  0.142  1.0
  Ge  Ge7  1  0.995  0.005  0.858  1.0
  Ge  Ge8  1  0.827  0.173  0.683  1.0
  Ge  Ge9  1  0.173  0.827  0.317  1.0
  Ge  Ge10  1  0.673  0.327  0.183  1.0
  Ge  Ge11  1  0.327  0.673  0.817  1.0
  O  O12  1  0.335  0.153  0.406  1.0
  O  O13  1  0.153  0.335  0.594  1.0
  O  O14  1  0.165  0.347  0.906  1.0
  O  O15  1  0.347  0.165  0.094  1.0
  O  O16  1  0.665  0.847  0.594  1.0
  O  O17  1  0.847  0.665  0.406  1.0
  O  O18  1  0.835  0.653  0.094  1.0
  O  O19  1  0.653  0.835  0.906  1.0
  O  O20  1  0.002  0.498  0.750  1.0
  O  O21  1  0.498  0.002  0.250  1.0
  O  O22  1  0.998  0.502  0.250  1.0
  O  O23  1  0.502  0.998  0.750  1.0
  O  O24  1  0.494  0.506  0.761  1.0
  O  O25  1  0.506  0.494  0.239  1.0
  O  O26  1  0.006  0.994  0.261  1.0
  O  O27  1  0.994  0.006  0.739  1.0
  O  O28  1  0.166  0.834  0.899  1.0
  O  O29  1  0.834  0.166  0.101  1.0
  O  O30  1  0.334  0.666  0.399  1.0
  O  O31  1  0.666  0.334  0.601  1.0
[/CIF]
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The material described by BaGe2O5 crystallizes in the orthorhombic Cmce space group. Ba(1) is bonded to one O(3), two equivalent O(2), three equivalent O(4), and six equivalent O(1) atoms to form BaO12 cuboctahedra that share corners with eight equivalent Ba(1)O12 cuboctahedra, corners with four equivalent Ge(1)O4 tetrahedra,  an edgeedge with one Ge(2)O6 octahedra, edges with three equivalent Ge(1)O4 tetrahedra, faces with three equivalent Ba(1)O12 cuboctahedra, and faces with four equivalent Ge(2)O6 octahedra. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(3), one O(4), and two equivalent O(1) atoms to form GeO4 tetrahedra that share corners with four equivalent Ba(1)O12 cuboctahedra, corners with four equivalent Ge(2)O6 octahedra, and edges with three equivalent Ba(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 55-64°. In the second Ge site, Ge(2) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form GeO6 octahedra that share corners with two equivalent Ge(2)O6 octahedra, corners with four equivalent Ge(1)O4 tetrahedra,  an edgeedge with one Ba(1)O12 cuboctahedra, and faces with four equivalent Ba(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 48°. There are four inequivalent O sites. In the first O site, O(2) is bonded in a distorted bent 120 degrees geometry to two equivalent Ba(1) and two equivalent Ge(2) atoms. In the second O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one Ge(1), and one Ge(2) atom. In the third O site, O(4) is bonded in a distorted bent 120 degrees geometry to three equivalent Ba(1), one Ge(1), and one Ge(2) atom. In the fourth O site, O(1) is bonded in a distorted bent 120 degrees geometry to three equivalent Ba(1), one Ge(1), and one Ge(2) atom. is represented by the CIF file [CIF]
data_BaGe2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.743
_cell_length_b   5.743
_cell_length_c   14.612
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   121.445
_symmetry_Int_Tables_number   1
_cell_volume   411.126
_cell_formula_units_Z   4
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  0.162  0.838  0.581  1.0
  Ba  Ba1  1  0.838  0.162  0.419  1.0
  Ba  Ba2  1  0.338  0.662  0.081  1.0
  Ba  Ba3  1  0.662  0.338  0.919  1.0
  Ge  Ge4  1  0.495  0.505  0.642  1.0
  Ge  Ge5  1  0.505  0.495  0.358  1.0
  Ge  Ge6  1  0.005  0.995  0.142  1.0
  Ge  Ge7  1  0.995  0.005  0.858  1.0
  Ge  Ge8  1  0.827  0.173  0.683  1.0
  Ge  Ge9  1  0.173  0.827  0.317  1.0
  Ge  Ge10  1  0.673  0.327  0.183  1.0
  Ge  Ge11  1  0.327  0.673  0.817  1.0
  O  O12  1  0.335  0.153  0.406  1.0
  O  O13  1  0.153  0.335  0.594  1.0
  O  O14  1  0.165  0.347  0.906  1.0
  O  O15  1  0.347  0.165  0.094  1.0
  O  O16  1  0.665  0.847  0.594  1.0
  O  O17  1  0.847  0.665  0.406  1.0
  O  O18  1  0.835  0.653  0.094  1.0
  O  O19  1  0.653  0.835  0.906  1.0
  O  O20  1  0.002  0.498  0.750  1.0
  O  O21  1  0.498  0.002  0.250  1.0
  O  O22  1  0.998  0.502  0.250  1.0
  O  O23  1  0.502  0.998  0.750  1.0
  O  O24  1  0.494  0.506  0.761  1.0
  O  O25  1  0.506  0.494  0.239  1.0
  O  O26  1  0.006  0.994  0.261  1.0
  O  O27  1  0.994  0.006  0.739  1.0
  O  O28  1  0.166  0.834  0.899  1.0
  O  O29  1  0.834  0.166  0.101  1.0
  O  O30  1  0.334  0.666  0.399  1.0
  O  O31  1  0.666  0.334  0.601  1.0
[/CIF]
.