The material structure described by Na3HfTa(GeO4)3 crystallizes in the monoclinic Cc space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded in a distorted hexagonal planar geometry to one O(1), one O(11), one O(12), one O(2), one O(5), and one O(6) atom. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(11), one O(12), one O(2), and one O(9) atom. In the third Na site, Na(3) is bonded in a 7-coordinate geometry to one O(11), one O(2), one O(5), one O(6), one O(7), and two equivalent O(4) atoms. Hf(1) is bonded to one O(1), one O(11), one O(4), one O(5), one O(8), and one O(9) atom to form HfO6 octahedra that share corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, and corners with two equivalent Ge(3)O4 tetrahedra. Ta(1) is bonded to one O(10), one O(12), one O(2), one O(3), one O(6), and one O(7) atom to form TaO6 octahedra that share corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, and corners with two equivalent Ge(3)O4 tetrahedra. There are three inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(11), one O(12), one O(3), and one O(4) atom to form GeO4 tetrahedra that share corners with two equivalent Hf(1)O6 octahedra and corners with two equivalent Ta(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 19-42°. In the second Ge site, Ge(2) is bonded to one O(2), one O(5), one O(7), and one O(9) atom to form GeO4 tetrahedra that share corners with two equivalent Hf(1)O6 octahedra and corners with two equivalent Ta(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 26-41°. In the third Ge site, Ge(3) is bonded to one O(1), one O(10), one O(6), and one O(8) atom to form GeO4 tetrahedra that share corners with two equivalent Hf(1)O6 octahedra and corners with two equivalent Ta(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 17-40°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Na(1), one Na(2), one Hf(1), and one Ge(3) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Na(3), one Ta(1), and one Ge(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Ta(1) and one Ge(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to two equivalent Na(3), one Hf(1), and one Ge(1) atom. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to one Na(1), one Na(3), one Hf(1), and one Ge(2) atom. In the sixth O site, O(6) is bonded to one Na(1), one Na(3), one Ta(1), and one Ge(3) atom to form distorted corner-sharing ONa2TaGe trigonal pyramids. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Na(3), one Ta(1), and one Ge(2) atom. In the eighth O site, O(8) is bonded in a linear geometry to one Hf(1) and one Ge(3) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Na(2), one Hf(1), and one Ge(2) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Na(2), one Ta(1), and one Ge(3) atom. In the eleventh O site, O(11) is bonded to one Na(1), one Na(2), one Na(3), one Hf(1), and one Ge(1) atom to form distorted corner-sharing ONa3HfGe trigonal bipyramids. In the twelfth O site, O(12) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(2), one Ta(1), and one Ge(1) atom. is represented by the CIF file [CIF]
data_Na3HfTa(GeO4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.321
_cell_length_b   9.394
_cell_length_c   9.394
_cell_angle_alpha   119.833
_cell_angle_beta   119.707
_cell_angle_gamma   60.293
_symmetry_Int_Tables_number   1
_cell_volume   584.876
_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
  Ge  Ge0  1  0.245  0.036  0.044  1.0
  Ge  Ge1  1  0.745  0.956  0.964  1.0
  Ge  Ge2  1  0.243  0.461  0.751  1.0
  Ge  Ge3  1  0.256  0.753  0.462  1.0
  Ge  Ge4  1  0.756  0.538  0.247  1.0
  Ge  Ge5  1  0.743  0.249  0.539  1.0
  Hf  Hf6  1  0.431  0.357  0.144  1.0
  Hf  Hf7  1  0.931  0.856  0.643  1.0
  Na  Na8  1  0.002  0.528  0.020  1.0
  Na  Na9  1  0.502  0.980  0.472  1.0
  Na  Na10  1  0.255  0.382  0.385  1.0
  Na  Na11  1  0.755  0.615  0.618  1.0
  Na  Na12  1  0.711  0.246  0.865  1.0
  Na  Na13  1  0.211  0.135  0.754  1.0
  O  O14  1  0.255  0.575  0.271  1.0
  O  O15  1  0.242  0.266  0.565  1.0
  O  O16  1  0.742  0.435  0.734  1.0
  O  O17  1  0.755  0.729  0.425  1.0
  O  O18  1  0.427  0.850  0.991  1.0
  O  O19  1  0.057  0.011  0.868  1.0
  O  O20  1  0.557  0.132  0.989  1.0
  O  O21  1  0.927  0.009  0.150  1.0
  O  O22  1  0.249  0.419  0.915  1.0
  O  O23  1  0.244  0.944  0.455  1.0
  O  O24  1  0.744  0.545  0.056  1.0
  O  O25  1  0.749  0.085  0.581  1.0
  O  O26  1  0.433  0.496  0.786  1.0
  O  O27  1  0.080  0.799  0.515  1.0
  O  O28  1  0.580  0.485  0.201  1.0
  O  O29  1  0.933  0.214  0.504  1.0
  O  O30  1  0.055  0.630  0.699  1.0
  O  O31  1  0.448  0.706  0.645  1.0
  O  O32  1  0.948  0.355  0.294  1.0
  O  O33  1  0.555  0.301  0.370  1.0
  O  O34  1  0.256  0.231  0.073  1.0
  O  O35  1  0.244  0.059  0.242  1.0
  O  O36  1  0.744  0.758  0.941  1.0
  O  O37  1  0.756  0.927  0.769  1.0
  Ta  Ta38  1  0.069  0.141  0.355  1.0
  Ta  Ta39  1  0.569  0.645  0.859  1.0
[/CIF]
.
The material structure described by Na3HfTa(GeO4)3 crystallizes in the monoclinic Cc space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded in a distorted hexagonal planar geometry to one O(1), one O(11), one O(12), one O(2), one O(5), and one O(6) atom. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(11), one O(12), one O(2), and one O(9) atom. In the third Na site, Na(3) is bonded in a 7-coordinate geometry to one O(11), one O(2), one O(5), one O(6), one O(7), and two equivalent O(4) atoms. Hf(1) is bonded to one O(1), one O(11), one O(4), one O(5), one O(8), and one O(9) atom to form HfO6 octahedra that share corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, and corners with two equivalent Ge(3)O4 tetrahedra. Ta(1) is bonded to one O(10), one O(12), one O(2), one O(3), one O(6), and one O(7) atom to form TaO6 octahedra that share corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, and corners with two equivalent Ge(3)O4 tetrahedra. There are three inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(11), one O(12), one O(3), and one O(4) atom to form GeO4 tetrahedra that share corners with two equivalent Hf(1)O6 octahedra and corners with two equivalent Ta(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 19-42°. In the second Ge site, Ge(2) is bonded to one O(2), one O(5), one O(7), and one O(9) atom to form GeO4 tetrahedra that share corners with two equivalent Hf(1)O6 octahedra and corners with two equivalent Ta(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 26-41°. In the third Ge site, Ge(3) is bonded to one O(1), one O(10), one O(6), and one O(8) atom to form GeO4 tetrahedra that share corners with two equivalent Hf(1)O6 octahedra and corners with two equivalent Ta(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 17-40°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Na(1), one Na(2), one Hf(1), and one Ge(3) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Na(3), one Ta(1), and one Ge(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Ta(1) and one Ge(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to two equivalent Na(3), one Hf(1), and one Ge(1) atom. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to one Na(1), one Na(3), one Hf(1), and one Ge(2) atom. In the sixth O site, O(6) is bonded to one Na(1), one Na(3), one Ta(1), and one Ge(3) atom to form distorted corner-sharing ONa2TaGe trigonal pyramids. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Na(3), one Ta(1), and one Ge(2) atom. In the eighth O site, O(8) is bonded in a linear geometry to one Hf(1) and one Ge(3) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Na(2), one Hf(1), and one Ge(2) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Na(2), one Ta(1), and one Ge(3) atom. In the eleventh O site, O(11) is bonded to one Na(1), one Na(2), one Na(3), one Hf(1), and one Ge(1) atom to form distorted corner-sharing ONa3HfGe trigonal bipyramids. In the twelfth O site, O(12) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(2), one Ta(1), and one Ge(1) atom. is represented by the CIF file [CIF]
data_Na3HfTa(GeO4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.321
_cell_length_b   9.394
_cell_length_c   9.394
_cell_angle_alpha   119.833
_cell_angle_beta   119.707
_cell_angle_gamma   60.293
_symmetry_Int_Tables_number   1
_cell_volume   584.876
_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
  Ge  Ge0  1  0.245  0.036  0.044  1.0
  Ge  Ge1  1  0.745  0.956  0.964  1.0
  Ge  Ge2  1  0.243  0.461  0.751  1.0
  Ge  Ge3  1  0.256  0.753  0.462  1.0
  Ge  Ge4  1  0.756  0.538  0.247  1.0
  Ge  Ge5  1  0.743  0.249  0.539  1.0
  Hf  Hf6  1  0.431  0.357  0.144  1.0
  Hf  Hf7  1  0.931  0.856  0.643  1.0
  Na  Na8  1  0.002  0.528  0.020  1.0
  Na  Na9  1  0.502  0.980  0.472  1.0
  Na  Na10  1  0.255  0.382  0.385  1.0
  Na  Na11  1  0.755  0.615  0.618  1.0
  Na  Na12  1  0.711  0.246  0.865  1.0
  Na  Na13  1  0.211  0.135  0.754  1.0
  O  O14  1  0.255  0.575  0.271  1.0
  O  O15  1  0.242  0.266  0.565  1.0
  O  O16  1  0.742  0.435  0.734  1.0
  O  O17  1  0.755  0.729  0.425  1.0
  O  O18  1  0.427  0.850  0.991  1.0
  O  O19  1  0.057  0.011  0.868  1.0
  O  O20  1  0.557  0.132  0.989  1.0
  O  O21  1  0.927  0.009  0.150  1.0
  O  O22  1  0.249  0.419  0.915  1.0
  O  O23  1  0.244  0.944  0.455  1.0
  O  O24  1  0.744  0.545  0.056  1.0
  O  O25  1  0.749  0.085  0.581  1.0
  O  O26  1  0.433  0.496  0.786  1.0
  O  O27  1  0.080  0.799  0.515  1.0
  O  O28  1  0.580  0.485  0.201  1.0
  O  O29  1  0.933  0.214  0.504  1.0
  O  O30  1  0.055  0.630  0.699  1.0
  O  O31  1  0.448  0.706  0.645  1.0
  O  O32  1  0.948  0.355  0.294  1.0
  O  O33  1  0.555  0.301  0.370  1.0
  O  O34  1  0.256  0.231  0.073  1.0
  O  O35  1  0.244  0.059  0.242  1.0
  O  O36  1  0.744  0.758  0.941  1.0
  O  O37  1  0.756  0.927  0.769  1.0
  Ta  Ta38  1  0.069  0.141  0.355  1.0
  Ta  Ta39  1  0.569  0.645  0.859  1.0
[/CIF]
.