The material structure described by Na2TaSnSi2PO12 crystallizes in the monoclinic Cc space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 8-coordinate geometry to one O(10), one O(12), one O(4), one O(6), one O(7), one O(8), and two equivalent O(2) atoms. In the second Na site, Na(2) is bonded in a distorted hexagonal planar geometry to one O(10), one O(11), one O(12), one O(7), one O(8), and one O(9) atom. Ta(1) is bonded to one O(10), one O(11), one O(12), one O(4), one O(5), and one O(6) atom to form TaO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and corners with two equivalent P(1)O4 tetrahedra. Sn(1) is bonded to one O(1), one O(2), one O(3), one O(7), one O(8), and one O(9) atom to form SnO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and corners with two equivalent P(1)O4 tetrahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(11), one O(2), one O(5), and one O(8) atom to form SiO4 tetrahedra that share corners with two equivalent Ta(1)O6 octahedra and corners with two equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 21-36°. In the second Si site, Si(2) is bonded to one O(12), one O(3), one O(4), and one O(7) atom to form SiO4 tetrahedra that share corners with two equivalent Ta(1)O6 octahedra and corners with two equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 28-36°. P(1) is bonded to one O(1), one O(10), one O(6), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Ta(1)O6 octahedra and corners with two equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 24-34°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Sn(1) and one P(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Sn(1), and one Si(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Sn(1) and one Si(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Ta(1), and one Si(2) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Ta(1) and one Si(1) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Ta(1), and one P(1) atom. In the seventh O site, O(7) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(2), one Sn(1), and one Si(2) atom. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(2), one Sn(1), and one Si(1) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Na(2), one Sn(1), and one P(1) atom. In the tenth O site, O(10) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(2), one Ta(1), and one P(1) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Na(2), one Ta(1), and one Si(1) atom. 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 Si(2) atom. is represented by the CIF card [CIF]
data_Na2TaSi2SnPO12
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.936
_cell_length_b   8.936
_cell_length_c   9.150
_cell_angle_alpha   90.256
_cell_angle_beta   119.101
_cell_angle_gamma   119.831
_symmetry_Int_Tables_number   1
_cell_volume   523.774
_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
  Na  Na0  1  0.870  0.757  0.250  1.0
  Na  Na1  1  0.492  0.879  0.750  1.0
  Na  Na2  1  0.003  0.490  0.508  1.0
  Na  Na3  1  0.018  0.005  0.008  1.0
  O  O4  1  0.356  0.482  0.083  1.0
  O  O5  1  0.598  0.864  0.073  1.0
  O  O6  1  0.210  0.723  0.078  1.0
  O  O7  1  0.209  0.975  0.573  1.0
  O  O8  1  0.601  0.226  0.583  1.0
  O  O9  1  0.355  0.367  0.578  1.0
  O  O10  1  0.649  0.509  0.930  1.0
  O  O11  1  0.422  0.143  0.919  1.0
  O  O12  1  0.779  0.275  0.913  1.0
  O  O13  1  0.777  0.997  0.419  1.0
  O  O14  1  0.420  0.781  0.430  1.0
  O  O15  1  0.638  0.634  0.413  1.0
  O  O16  1  0.342  0.571  0.767  1.0
  O  O17  1  0.202  0.776  0.766  1.0
  O  O18  1  0.986  0.414  0.770  1.0
  O  O19  1  0.990  0.064  0.266  1.0
  O  O20  1  0.196  0.925  0.267  1.0
  O  O21  1  0.356  0.284  0.270  1.0
  O  O22  1  0.656  0.446  0.232  1.0
  O  O23  1  0.791  0.225  0.228  1.0
  O  O24  1  0.002  0.573  0.230  1.0
  O  O25  1  0.004  0.937  0.728  1.0
  O  O26  1  0.786  0.076  0.732  1.0
  O  O27  1  0.656  0.728  0.730  1.0
  P  P28  1  0.495  0.459  0.248  1.0
  P  P29  1  0.790  0.253  0.748  1.0
  Si  Si30  1  0.790  0.042  0.249  1.0
  Si  Si31  1  0.213  0.753  0.252  1.0
  Si  Si32  1  0.207  0.959  0.749  1.0
  Si  Si33  1  0.499  0.539  0.752  1.0
  Sn  Sn34  1  0.293  0.649  0.943  1.0
  Sn  Sn35  1  0.294  0.149  0.443  1.0
  Ta  Ta36  1  0.709  0.353  0.064  1.0
  Ta  Ta37  1  0.710  0.855  0.564  1.0
[/CIF]
.
The material structure described by Na2TaSnSi2PO12 crystallizes in the monoclinic Cc space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 8-coordinate geometry to one O(10), one O(12), one O(4), one O(6), one O(7), one O(8), and two equivalent O(2) atoms. In the second Na site, Na(2) is bonded in a distorted hexagonal planar geometry to one O(10), one O(11), one O(12), one O(7), one O(8), and one O(9) atom. Ta(1) is bonded to one O(10), one O(11), one O(12), one O(4), one O(5), and one O(6) atom to form TaO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and corners with two equivalent P(1)O4 tetrahedra. Sn(1) is bonded to one O(1), one O(2), one O(3), one O(7), one O(8), and one O(9) atom to form SnO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and corners with two equivalent P(1)O4 tetrahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(11), one O(2), one O(5), and one O(8) atom to form SiO4 tetrahedra that share corners with two equivalent Ta(1)O6 octahedra and corners with two equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 21-36°. In the second Si site, Si(2) is bonded to one O(12), one O(3), one O(4), and one O(7) atom to form SiO4 tetrahedra that share corners with two equivalent Ta(1)O6 octahedra and corners with two equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 28-36°. P(1) is bonded to one O(1), one O(10), one O(6), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Ta(1)O6 octahedra and corners with two equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 24-34°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Sn(1) and one P(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Sn(1), and one Si(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Sn(1) and one Si(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Ta(1), and one Si(2) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Ta(1) and one Si(1) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Ta(1), and one P(1) atom. In the seventh O site, O(7) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(2), one Sn(1), and one Si(2) atom. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(2), one Sn(1), and one Si(1) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Na(2), one Sn(1), and one P(1) atom. In the tenth O site, O(10) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(2), one Ta(1), and one P(1) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Na(2), one Ta(1), and one Si(1) atom. 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 Si(2) atom. is represented by the CIF card [CIF]
data_Na2TaSi2SnPO12
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.936
_cell_length_b   8.936
_cell_length_c   9.150
_cell_angle_alpha   90.256
_cell_angle_beta   119.101
_cell_angle_gamma   119.831
_symmetry_Int_Tables_number   1
_cell_volume   523.774
_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
  Na  Na0  1  0.870  0.757  0.250  1.0
  Na  Na1  1  0.492  0.879  0.750  1.0
  Na  Na2  1  0.003  0.490  0.508  1.0
  Na  Na3  1  0.018  0.005  0.008  1.0
  O  O4  1  0.356  0.482  0.083  1.0
  O  O5  1  0.598  0.864  0.073  1.0
  O  O6  1  0.210  0.723  0.078  1.0
  O  O7  1  0.209  0.975  0.573  1.0
  O  O8  1  0.601  0.226  0.583  1.0
  O  O9  1  0.355  0.367  0.578  1.0
  O  O10  1  0.649  0.509  0.930  1.0
  O  O11  1  0.422  0.143  0.919  1.0
  O  O12  1  0.779  0.275  0.913  1.0
  O  O13  1  0.777  0.997  0.419  1.0
  O  O14  1  0.420  0.781  0.430  1.0
  O  O15  1  0.638  0.634  0.413  1.0
  O  O16  1  0.342  0.571  0.767  1.0
  O  O17  1  0.202  0.776  0.766  1.0
  O  O18  1  0.986  0.414  0.770  1.0
  O  O19  1  0.990  0.064  0.266  1.0
  O  O20  1  0.196  0.925  0.267  1.0
  O  O21  1  0.356  0.284  0.270  1.0
  O  O22  1  0.656  0.446  0.232  1.0
  O  O23  1  0.791  0.225  0.228  1.0
  O  O24  1  0.002  0.573  0.230  1.0
  O  O25  1  0.004  0.937  0.728  1.0
  O  O26  1  0.786  0.076  0.732  1.0
  O  O27  1  0.656  0.728  0.730  1.0
  P  P28  1  0.495  0.459  0.248  1.0
  P  P29  1  0.790  0.253  0.748  1.0
  Si  Si30  1  0.790  0.042  0.249  1.0
  Si  Si31  1  0.213  0.753  0.252  1.0
  Si  Si32  1  0.207  0.959  0.749  1.0
  Si  Si33  1  0.499  0.539  0.752  1.0
  Sn  Sn34  1  0.293  0.649  0.943  1.0
  Sn  Sn35  1  0.294  0.149  0.443  1.0
  Ta  Ta36  1  0.709  0.353  0.064  1.0
  Ta  Ta37  1  0.710  0.855  0.564  1.0
[/CIF]
.