The compound described by Na3Al2(PO4)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 8-coordinate geometry to one O(1), one O(10), one O(11), one O(12), one O(2), one O(7), one O(8), and one O(9) atom. In the third Na site, Na(3) is bonded in a 7-coordinate geometry to one O(1), one O(12), one O(5), one O(6), one O(8), and two equivalent O(3) atoms. There are two inequivalent Al sites. In the first Al site, Al(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 AlO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. In the second Al site, Al(2) 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 AlO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. There are three inequivalent P sites. In the first P site, P(1) is bonded to one O(11), one O(12), one O(3), and one O(4) atom to form PO4 tetrahedra that share corners with two equivalent Al(1)O6 octahedra and corners with two equivalent Al(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 23-38°. In the second P site, P(2) is bonded to one O(2), one O(5), one O(7), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Al(1)O6 octahedra and corners with two equivalent Al(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 22-36°. In the third P site, P(3) is bonded to one O(1), one O(10), one O(6), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Al(1)O6 octahedra and corners with two equivalent Al(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 28-35°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), one Na(2), one Na(3), one Al(1), and one P(3) atom to form distorted ONa3AlP trigonal bipyramids that share corners with three equivalent O(12)Na3AlP trigonal bipyramids and  a faceface with one O(5)Na2AlP trigonal pyramid. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Na(1), one Na(2), one Al(2), and one P(2) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to two equivalent Na(3), one Al(2), and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Al(1) and one P(1) atom. In the fifth O site, O(5) is bonded to one Na(1), one Na(3), one Al(1), and one P(2) atom to form a mixture of distorted face and corner-sharing ONa2AlP trigonal pyramids. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(3), one Al(2), and one P(3) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Na(2), one Al(2), and one P(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Na(2), one Na(3), one Al(1), and one P(3) atom. In the ninth O site, O(9) is bonded in a 2-coordinate geometry to one Na(2), one Al(1), and one P(2) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Na(2), one Al(2), and one P(3) atom. In the eleventh O site, O(11) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(2), one Al(1), and one P(1) atom. In the twelfth O site, O(12) is bonded to one Na(1), one Na(2), one Na(3), one Al(2), and one P(1) atom to form distorted ONa3AlP trigonal bipyramids that share corners with three equivalent O(1)Na3AlP trigonal bipyramids and corners with two equivalent O(5)Na2AlP trigonal pyramids. is represented by the CIF file [CIF]
data_Na3Al2(PO4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.573
_cell_length_b   8.600
_cell_length_c   8.645
_cell_angle_alpha   119.440
_cell_angle_beta   90.000
_cell_angle_gamma   119.898
_symmetry_Int_Tables_number   1
_cell_volume   455.162
_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
  Al  Al0  1  0.140  0.792  0.440  1.0
  Al  Al1  1  0.354  0.207  0.061  1.0
  Al  Al2  1  0.853  0.207  0.561  1.0
  Al  Al3  1  0.653  0.792  0.940  1.0
  Na  Na4  1  0.985  0.505  0.002  1.0
  Na  Na5  1  0.520  0.505  0.502  1.0
  Na  Na6  1  0.397  0.997  0.251  1.0
  Na  Na7  1  0.600  0.997  0.751  1.0
  Na  Na8  1  0.255  0.372  0.786  1.0
  Na  Na9  1  0.116  0.372  0.286  1.0
  O  O10  1  0.275  0.695  0.266  1.0
  O  O11  1  0.573  0.296  0.234  1.0
  O  O12  1  0.722  0.296  0.734  1.0
  O  O13  1  0.420  0.695  0.766  1.0
  O  O14  1  0.012  0.143  0.430  1.0
  O  O15  1  0.867  0.863  0.079  1.0
  O  O16  1  0.996  0.863  0.579  1.0
  O  O17  1  0.131  0.143  0.930  1.0
  O  O18  1  0.926  0.488  0.266  1.0
  O  O19  1  0.430  0.505  0.237  1.0
  O  O20  1  0.075  0.505  0.737  1.0
  O  O21  1  0.562  0.488  0.766  1.0
  O  O22  1  0.782  0.280  0.417  1.0
  O  O23  1  0.494  0.710  0.078  1.0
  O  O24  1  0.216  0.710  0.578  1.0
  O  O25  1  0.498  0.280  0.917  1.0
  O  O26  1  0.714  0.082  0.067  1.0
  O  O27  1  0.631  0.917  0.432  1.0
  O  O28  1  0.285  0.917  0.932  1.0
  O  O29  1  0.368  0.082  0.567  1.0
  O  O30  1  0.069  0.839  0.264  1.0
  O  O31  1  0.225  0.157  0.238  1.0
  O  O32  1  0.932  0.157  0.738  1.0
  O  O33  1  0.770  0.839  0.764  1.0
  P  P34  1  0.037  0.995  0.252  1.0
  P  P35  1  0.958  0.995  0.752  1.0
  P  P36  1  0.750  0.289  0.247  1.0
  P  P37  1  0.463  0.707  0.254  1.0
  P  P38  1  0.244  0.707  0.754  1.0
  P  P39  1  0.539  0.289  0.747  1.0
[/CIF]
.
The compound described by Na3Al2(PO4)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 8-coordinate geometry to one O(1), one O(10), one O(11), one O(12), one O(2), one O(7), one O(8), and one O(9) atom. In the third Na site, Na(3) is bonded in a 7-coordinate geometry to one O(1), one O(12), one O(5), one O(6), one O(8), and two equivalent O(3) atoms. There are two inequivalent Al sites. In the first Al site, Al(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 AlO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. In the second Al site, Al(2) 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 AlO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. There are three inequivalent P sites. In the first P site, P(1) is bonded to one O(11), one O(12), one O(3), and one O(4) atom to form PO4 tetrahedra that share corners with two equivalent Al(1)O6 octahedra and corners with two equivalent Al(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 23-38°. In the second P site, P(2) is bonded to one O(2), one O(5), one O(7), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Al(1)O6 octahedra and corners with two equivalent Al(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 22-36°. In the third P site, P(3) is bonded to one O(1), one O(10), one O(6), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Al(1)O6 octahedra and corners with two equivalent Al(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 28-35°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), one Na(2), one Na(3), one Al(1), and one P(3) atom to form distorted ONa3AlP trigonal bipyramids that share corners with three equivalent O(12)Na3AlP trigonal bipyramids and  a faceface with one O(5)Na2AlP trigonal pyramid. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Na(1), one Na(2), one Al(2), and one P(2) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to two equivalent Na(3), one Al(2), and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Al(1) and one P(1) atom. In the fifth O site, O(5) is bonded to one Na(1), one Na(3), one Al(1), and one P(2) atom to form a mixture of distorted face and corner-sharing ONa2AlP trigonal pyramids. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(3), one Al(2), and one P(3) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Na(2), one Al(2), and one P(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Na(2), one Na(3), one Al(1), and one P(3) atom. In the ninth O site, O(9) is bonded in a 2-coordinate geometry to one Na(2), one Al(1), and one P(2) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Na(2), one Al(2), and one P(3) atom. In the eleventh O site, O(11) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(2), one Al(1), and one P(1) atom. In the twelfth O site, O(12) is bonded to one Na(1), one Na(2), one Na(3), one Al(2), and one P(1) atom to form distorted ONa3AlP trigonal bipyramids that share corners with three equivalent O(1)Na3AlP trigonal bipyramids and corners with two equivalent O(5)Na2AlP trigonal pyramids. is represented by the CIF file [CIF]
data_Na3Al2(PO4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.573
_cell_length_b   8.600
_cell_length_c   8.645
_cell_angle_alpha   119.440
_cell_angle_beta   90.000
_cell_angle_gamma   119.898
_symmetry_Int_Tables_number   1
_cell_volume   455.162
_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
  Al  Al0  1  0.140  0.792  0.440  1.0
  Al  Al1  1  0.354  0.207  0.061  1.0
  Al  Al2  1  0.853  0.207  0.561  1.0
  Al  Al3  1  0.653  0.792  0.940  1.0
  Na  Na4  1  0.985  0.505  0.002  1.0
  Na  Na5  1  0.520  0.505  0.502  1.0
  Na  Na6  1  0.397  0.997  0.251  1.0
  Na  Na7  1  0.600  0.997  0.751  1.0
  Na  Na8  1  0.255  0.372  0.786  1.0
  Na  Na9  1  0.116  0.372  0.286  1.0
  O  O10  1  0.275  0.695  0.266  1.0
  O  O11  1  0.573  0.296  0.234  1.0
  O  O12  1  0.722  0.296  0.734  1.0
  O  O13  1  0.420  0.695  0.766  1.0
  O  O14  1  0.012  0.143  0.430  1.0
  O  O15  1  0.867  0.863  0.079  1.0
  O  O16  1  0.996  0.863  0.579  1.0
  O  O17  1  0.131  0.143  0.930  1.0
  O  O18  1  0.926  0.488  0.266  1.0
  O  O19  1  0.430  0.505  0.237  1.0
  O  O20  1  0.075  0.505  0.737  1.0
  O  O21  1  0.562  0.488  0.766  1.0
  O  O22  1  0.782  0.280  0.417  1.0
  O  O23  1  0.494  0.710  0.078  1.0
  O  O24  1  0.216  0.710  0.578  1.0
  O  O25  1  0.498  0.280  0.917  1.0
  O  O26  1  0.714  0.082  0.067  1.0
  O  O27  1  0.631  0.917  0.432  1.0
  O  O28  1  0.285  0.917  0.932  1.0
  O  O29  1  0.368  0.082  0.567  1.0
  O  O30  1  0.069  0.839  0.264  1.0
  O  O31  1  0.225  0.157  0.238  1.0
  O  O32  1  0.932  0.157  0.738  1.0
  O  O33  1  0.770  0.839  0.764  1.0
  P  P34  1  0.037  0.995  0.252  1.0
  P  P35  1  0.958  0.995  0.752  1.0
  P  P36  1  0.750  0.289  0.247  1.0
  P  P37  1  0.463  0.707  0.254  1.0
  P  P38  1  0.244  0.707  0.754  1.0
  P  P39  1  0.539  0.289  0.747  1.0
[/CIF]
.