The material described by RbTa(GeO3)3 crystallizes in the hexagonal P-6c2 space group. Rb(1) is bonded in a 6-coordinate geometry to six equivalent O(2) atoms. Ta(1) is bonded to six equivalent O(2) atoms to form TaO6 octahedra that share corners with six equivalent Ge(1)O4 tetrahedra. Ge(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form GeO4 tetrahedra that share corners with two equivalent Ta(1)O6 octahedra and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 40°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent Ge(1) atoms. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Rb(1), one Ta(1), and one Ge(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_RbTa(GeO3)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.160
_cell_length_b   7.160
_cell_length_c   10.278
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   456.321
_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
  Rb  Rb0  1  0.667  0.333  0.000  1.0
  Rb  Rb1  1  0.667  0.333  0.500  1.0
  Ta  Ta2  1  0.333  0.667  0.000  1.0
  Ta  Ta3  1  0.333  0.667  0.500  1.0
  Ge  Ge4  1  0.077  0.289  0.250  1.0
  Ge  Ge5  1  0.212  0.923  0.250  1.0
  Ge  Ge6  1  0.711  0.788  0.250  1.0
  Ge  Ge7  1  0.711  0.923  0.750  1.0
  Ge  Ge8  1  0.212  0.289  0.750  1.0
  Ge  Ge9  1  0.077  0.788  0.750  1.0
  O  O10  1  0.265  0.195  0.250  1.0
  O  O11  1  0.930  0.735  0.250  1.0
  O  O12  1  0.805  0.070  0.250  1.0
  O  O13  1  0.805  0.735  0.750  1.0
  O  O14  1  0.930  0.195  0.750  1.0
  O  O15  1  0.265  0.070  0.750  1.0
  O  O16  1  0.103  0.439  0.110  1.0
  O  O17  1  0.336  0.897  0.390  1.0
  O  O18  1  0.561  0.664  0.390  1.0
  O  O19  1  0.561  0.664  0.110  1.0
  O  O20  1  0.336  0.897  0.110  1.0
  O  O21  1  0.561  0.897  0.890  1.0
  O  O22  1  0.336  0.439  0.890  1.0
  O  O23  1  0.103  0.664  0.890  1.0
  O  O24  1  0.336  0.439  0.610  1.0
  O  O25  1  0.103  0.664  0.610  1.0
  O  O26  1  0.103  0.439  0.390  1.0
  O  O27  1  0.561  0.897  0.610  1.0
[/CIF]
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The material described by RbTa(GeO3)3 crystallizes in the hexagonal P-6c2 space group. Rb(1) is bonded in a 6-coordinate geometry to six equivalent O(2) atoms. Ta(1) is bonded to six equivalent O(2) atoms to form TaO6 octahedra that share corners with six equivalent Ge(1)O4 tetrahedra. Ge(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form GeO4 tetrahedra that share corners with two equivalent Ta(1)O6 octahedra and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 40°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent Ge(1) atoms. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Rb(1), one Ta(1), and one Ge(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_RbTa(GeO3)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.160
_cell_length_b   7.160
_cell_length_c   10.278
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   456.321
_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
  Rb  Rb0  1  0.667  0.333  0.000  1.0
  Rb  Rb1  1  0.667  0.333  0.500  1.0
  Ta  Ta2  1  0.333  0.667  0.000  1.0
  Ta  Ta3  1  0.333  0.667  0.500  1.0
  Ge  Ge4  1  0.077  0.289  0.250  1.0
  Ge  Ge5  1  0.212  0.923  0.250  1.0
  Ge  Ge6  1  0.711  0.788  0.250  1.0
  Ge  Ge7  1  0.711  0.923  0.750  1.0
  Ge  Ge8  1  0.212  0.289  0.750  1.0
  Ge  Ge9  1  0.077  0.788  0.750  1.0
  O  O10  1  0.265  0.195  0.250  1.0
  O  O11  1  0.930  0.735  0.250  1.0
  O  O12  1  0.805  0.070  0.250  1.0
  O  O13  1  0.805  0.735  0.750  1.0
  O  O14  1  0.930  0.195  0.750  1.0
  O  O15  1  0.265  0.070  0.750  1.0
  O  O16  1  0.103  0.439  0.110  1.0
  O  O17  1  0.336  0.897  0.390  1.0
  O  O18  1  0.561  0.664  0.390  1.0
  O  O19  1  0.561  0.664  0.110  1.0
  O  O20  1  0.336  0.897  0.110  1.0
  O  O21  1  0.561  0.897  0.890  1.0
  O  O22  1  0.336  0.439  0.890  1.0
  O  O23  1  0.103  0.664  0.890  1.0
  O  O24  1  0.336  0.439  0.610  1.0
  O  O25  1  0.103  0.664  0.610  1.0
  O  O26  1  0.103  0.439  0.390  1.0
  O  O27  1  0.561  0.897  0.610  1.0
[/CIF]
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