The material described by Cs2B4GeO9 crystallizes in the monoclinic C2 space group. There are two inequivalent Cs sites. In the first Cs site, Cs(1) is bonded in a 10-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. In the second Cs site, Cs(2) is bonded in a 9-coordinate geometry to one O(5), two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. There are two inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. In the second B site, B(2) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form BO4 tetrahedra that share  a cornercorner with one B(2)O4 tetrahedra and  a cornercorner with one Ge(1)O4 tetrahedra. Ge(1) is bonded to two equivalent O(3) and two equivalent O(4) atoms to form GeO4 tetrahedra that share corners with two equivalent B(2)O4 tetrahedra. There are five inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Cs(1), one Cs(2), one B(1), and one B(2) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Cs(1), one Cs(2), one B(1), and one B(2) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Cs(1), one Cs(2), one B(1), and one Ge(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Cs(1), one Cs(2), one B(2), and one Ge(1) atom. In the fifth O site, O(5) is bonded in a water-like geometry to one Cs(2), two equivalent Cs(1), and two equivalent B(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Cs2GeB4O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.992
_cell_length_b   6.992
_cell_length_c   6.842
_cell_angle_alpha   61.926
_cell_angle_beta   61.926
_cell_angle_gamma   93.306
_symmetry_Int_Tables_number   1
_cell_volume   243.100
_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
  Cs  Cs0  1  0.740  0.260  0.000  1.0
  Cs  Cs1  1  0.010  0.990  0.500  1.0
  Ge  Ge2  1  0.254  0.746  0.000  1.0
  B  B3  1  0.336  0.227  0.799  1.0
  B  B4  1  0.773  0.664  0.201  1.0
  B  B5  1  0.355  0.521  0.396  1.0
  B  B6  1  0.479  0.645  0.604  1.0
  O  O7  1  0.402  0.397  0.827  1.0
  O  O8  1  0.603  0.598  0.173  1.0
  O  O9  1  0.285  0.266  0.615  1.0
  O  O10  1  0.734  0.715  0.385  1.0
  O  O11  1  0.320  0.008  0.979  1.0
  O  O12  1  0.992  0.680  0.021  1.0
  O  O13  1  0.203  0.519  0.303  1.0
  O  O14  1  0.481  0.797  0.697  1.0
  O  O15  1  0.335  0.665  0.500  1.0
[/CIF]
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The material described by Cs2B4GeO9 crystallizes in the monoclinic C2 space group. There are two inequivalent Cs sites. In the first Cs site, Cs(1) is bonded in a 10-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. In the second Cs site, Cs(2) is bonded in a 9-coordinate geometry to one O(5), two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. There are two inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. In the second B site, B(2) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form BO4 tetrahedra that share  a cornercorner with one B(2)O4 tetrahedra and  a cornercorner with one Ge(1)O4 tetrahedra. Ge(1) is bonded to two equivalent O(3) and two equivalent O(4) atoms to form GeO4 tetrahedra that share corners with two equivalent B(2)O4 tetrahedra. There are five inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Cs(1), one Cs(2), one B(1), and one B(2) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Cs(1), one Cs(2), one B(1), and one B(2) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Cs(1), one Cs(2), one B(1), and one Ge(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Cs(1), one Cs(2), one B(2), and one Ge(1) atom. In the fifth O site, O(5) is bonded in a water-like geometry to one Cs(2), two equivalent Cs(1), and two equivalent B(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Cs2GeB4O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.992
_cell_length_b   6.992
_cell_length_c   6.842
_cell_angle_alpha   61.926
_cell_angle_beta   61.926
_cell_angle_gamma   93.306
_symmetry_Int_Tables_number   1
_cell_volume   243.100
_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
  Cs  Cs0  1  0.740  0.260  0.000  1.0
  Cs  Cs1  1  0.010  0.990  0.500  1.0
  Ge  Ge2  1  0.254  0.746  0.000  1.0
  B  B3  1  0.336  0.227  0.799  1.0
  B  B4  1  0.773  0.664  0.201  1.0
  B  B5  1  0.355  0.521  0.396  1.0
  B  B6  1  0.479  0.645  0.604  1.0
  O  O7  1  0.402  0.397  0.827  1.0
  O  O8  1  0.603  0.598  0.173  1.0
  O  O9  1  0.285  0.266  0.615  1.0
  O  O10  1  0.734  0.715  0.385  1.0
  O  O11  1  0.320  0.008  0.979  1.0
  O  O12  1  0.992  0.680  0.021  1.0
  O  O13  1  0.203  0.519  0.303  1.0
  O  O14  1  0.481  0.797  0.697  1.0
  O  O15  1  0.335  0.665  0.500  1.0
[/CIF]
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