The material structure described by BaCu2Ge2O7 crystallizes in the orthorhombic Pnma space group. Ba(1) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(3), and four equivalent O(2) atoms. Cu(1) is bonded in a rectangular see-saw-like geometry to one O(2), one O(3), and two equivalent O(4) atoms. Ge(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing GeO4 tetrahedra. There are four inequivalent O sites. In the first O site, O(3) is bonded in a distorted trigonal planar geometry to one Ba(1), one Cu(1), and one Ge(1) atom. In the second O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Cu(1) and one Ge(1) atom. In the third O site, O(1) is bonded in a distorted trigonal planar geometry to one Ba(1) and two equivalent Ge(1) atoms. In the fourth O site, O(2) is bonded to two equivalent Ba(1), one Cu(1), and one Ge(1) atom to form a mixture of distorted corner and edge-sharing OBa2CuGe tetrahedra. is represented by the CIF card [CIF]
data_BaCu2Ge2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.162
_cell_length_b   7.208
_cell_length_c   13.366
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   690.024
_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  0.024  0.050  0.250  1.0
  Ba  Ba1  1  0.524  0.450  0.250  1.0
  Ba  Ba2  1  0.476  0.550  0.750  1.0
  Ba  Ba3  1  0.976  0.950  0.750  1.0
  Cu  Cu4  1  0.786  0.202  0.006  1.0
  Cu  Cu5  1  0.286  0.298  0.494  1.0
  Cu  Cu6  1  0.714  0.702  0.994  1.0
  Cu  Cu7  1  0.214  0.798  0.506  1.0
  Cu  Cu8  1  0.214  0.798  0.994  1.0
  Cu  Cu9  1  0.714  0.702  0.506  1.0
  Cu  Cu10  1  0.286  0.298  0.006  1.0
  Cu  Cu11  1  0.786  0.202  0.494  1.0
  Ge  Ge12  1  0.012  0.527  0.128  1.0
  Ge  Ge13  1  0.512  0.973  0.372  1.0
  Ge  Ge14  1  0.488  0.027  0.872  1.0
  Ge  Ge15  1  0.988  0.473  0.628  1.0
  Ge  Ge16  1  0.988  0.473  0.872  1.0
  Ge  Ge17  1  0.488  0.027  0.628  1.0
  Ge  Ge18  1  0.512  0.973  0.128  1.0
  Ge  Ge19  1  0.012  0.527  0.372  1.0
  O  O20  1  0.899  0.506  0.250  1.0
  O  O21  1  0.399  0.994  0.250  1.0
  O  O22  1  0.601  0.006  0.750  1.0
  O  O23  1  0.101  0.494  0.750  1.0
  O  O24  1  0.189  0.355  0.136  1.0
  O  O25  1  0.689  0.145  0.364  1.0
  O  O26  1  0.311  0.855  0.864  1.0
  O  O27  1  0.811  0.645  0.636  1.0
  O  O28  1  0.811  0.645  0.864  1.0
  O  O29  1  0.311  0.855  0.636  1.0
  O  O30  1  0.689  0.145  0.136  1.0
  O  O31  1  0.189  0.355  0.364  1.0
  O  O32  1  0.078  0.762  0.115  1.0
  O  O33  1  0.578  0.738  0.385  1.0
  O  O34  1  0.422  0.262  0.885  1.0
  O  O35  1  0.922  0.238  0.615  1.0
  O  O36  1  0.922  0.238  0.885  1.0
  O  O37  1  0.422  0.262  0.615  1.0
  O  O38  1  0.578  0.738  0.115  1.0
  O  O39  1  0.078  0.762  0.385  1.0
  O  O40  1  0.822  0.465  0.045  1.0
  O  O41  1  0.322  0.035  0.455  1.0
  O  O42  1  0.678  0.965  0.955  1.0
  O  O43  1  0.178  0.535  0.545  1.0
  O  O44  1  0.178  0.535  0.955  1.0
  O  O45  1  0.678  0.965  0.545  1.0
  O  O46  1  0.322  0.035  0.045  1.0
  O  O47  1  0.822  0.465  0.455  1.0
[/CIF]
.
The material structure described by BaCu2Ge2O7 crystallizes in the orthorhombic Pnma space group. Ba(1) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(3), and four equivalent O(2) atoms. Cu(1) is bonded in a rectangular see-saw-like geometry to one O(2), one O(3), and two equivalent O(4) atoms. Ge(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing GeO4 tetrahedra. There are four inequivalent O sites. In the first O site, O(3) is bonded in a distorted trigonal planar geometry to one Ba(1), one Cu(1), and one Ge(1) atom. In the second O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Cu(1) and one Ge(1) atom. In the third O site, O(1) is bonded in a distorted trigonal planar geometry to one Ba(1) and two equivalent Ge(1) atoms. In the fourth O site, O(2) is bonded to two equivalent Ba(1), one Cu(1), and one Ge(1) atom to form a mixture of distorted corner and edge-sharing OBa2CuGe tetrahedra. is represented by the CIF card [CIF]
data_BaCu2Ge2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.162
_cell_length_b   7.208
_cell_length_c   13.366
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   690.024
_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  0.024  0.050  0.250  1.0
  Ba  Ba1  1  0.524  0.450  0.250  1.0
  Ba  Ba2  1  0.476  0.550  0.750  1.0
  Ba  Ba3  1  0.976  0.950  0.750  1.0
  Cu  Cu4  1  0.786  0.202  0.006  1.0
  Cu  Cu5  1  0.286  0.298  0.494  1.0
  Cu  Cu6  1  0.714  0.702  0.994  1.0
  Cu  Cu7  1  0.214  0.798  0.506  1.0
  Cu  Cu8  1  0.214  0.798  0.994  1.0
  Cu  Cu9  1  0.714  0.702  0.506  1.0
  Cu  Cu10  1  0.286  0.298  0.006  1.0
  Cu  Cu11  1  0.786  0.202  0.494  1.0
  Ge  Ge12  1  0.012  0.527  0.128  1.0
  Ge  Ge13  1  0.512  0.973  0.372  1.0
  Ge  Ge14  1  0.488  0.027  0.872  1.0
  Ge  Ge15  1  0.988  0.473  0.628  1.0
  Ge  Ge16  1  0.988  0.473  0.872  1.0
  Ge  Ge17  1  0.488  0.027  0.628  1.0
  Ge  Ge18  1  0.512  0.973  0.128  1.0
  Ge  Ge19  1  0.012  0.527  0.372  1.0
  O  O20  1  0.899  0.506  0.250  1.0
  O  O21  1  0.399  0.994  0.250  1.0
  O  O22  1  0.601  0.006  0.750  1.0
  O  O23  1  0.101  0.494  0.750  1.0
  O  O24  1  0.189  0.355  0.136  1.0
  O  O25  1  0.689  0.145  0.364  1.0
  O  O26  1  0.311  0.855  0.864  1.0
  O  O27  1  0.811  0.645  0.636  1.0
  O  O28  1  0.811  0.645  0.864  1.0
  O  O29  1  0.311  0.855  0.636  1.0
  O  O30  1  0.689  0.145  0.136  1.0
  O  O31  1  0.189  0.355  0.364  1.0
  O  O32  1  0.078  0.762  0.115  1.0
  O  O33  1  0.578  0.738  0.385  1.0
  O  O34  1  0.422  0.262  0.885  1.0
  O  O35  1  0.922  0.238  0.615  1.0
  O  O36  1  0.922  0.238  0.885  1.0
  O  O37  1  0.422  0.262  0.615  1.0
  O  O38  1  0.578  0.738  0.115  1.0
  O  O39  1  0.078  0.762  0.385  1.0
  O  O40  1  0.822  0.465  0.045  1.0
  O  O41  1  0.322  0.035  0.455  1.0
  O  O42  1  0.678  0.965  0.955  1.0
  O  O43  1  0.178  0.535  0.545  1.0
  O  O44  1  0.178  0.535  0.955  1.0
  O  O45  1  0.678  0.965  0.545  1.0
  O  O46  1  0.322  0.035  0.045  1.0
  O  O47  1  0.822  0.465  0.455  1.0
[/CIF]
.