The material described by Na2Sr3P4 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to one P(1), one P(2), one P(3), and two equivalent P(4) atoms to form distorted NaP5 square pyramids that share corners with two equivalent Sr(1)P6 octahedra, corners with two equivalent Sr(2)P6 octahedra, corners with two equivalent Na(1)P5 square pyramids, faces with two equivalent Sr(1)P6 octahedra, and faces with two equivalent Sr(2)P6 octahedra. The corner-sharing octahedral tilt angles range from 42-47°. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to one P(1), one P(4), two equivalent P(2), and two equivalent P(3) atoms. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one P(1), one P(3), two equivalent P(2), and two equivalent P(4) atoms to form distorted SrP6 octahedra that share corners with two equivalent Sr(1)P6 octahedra, corners with two equivalent Sr(2)P6 octahedra, corners with two equivalent Na(1)P5 square pyramids,  an edgeedge with one Sr(1)P6 octahedra, edges with two equivalent Sr(2)P6 octahedra,  a faceface with one Sr(2)P6 octahedra, and faces with two equivalent Na(1)P5 square pyramids. The corner-sharing octahedral tilt angles range from 38-40°. In the second Sr site, Sr(2) is bonded to one P(2), one P(3), two equivalent P(1), and two equivalent P(4) atoms to form distorted SrP6 octahedra that share corners with two equivalent Sr(1)P6 octahedra, corners with two equivalent Sr(2)P6 octahedra, corners with two equivalent Na(1)P5 square pyramids,  an edgeedge with one Sr(2)P6 octahedra, edges with two equivalent Sr(1)P6 octahedra,  a faceface with one Sr(1)P6 octahedra, and faces with two equivalent Na(1)P5 square pyramids. The corner-sharing octahedral tilt angles range from 38-40°. In the third Sr site, Sr(3) is bonded in a 6-coordinate geometry to one P(2), one P(4), two equivalent P(1), and two equivalent P(3) atoms. There are four inequivalent P sites. In the first P site, P(4) is bonded in a 9-coordinate geometry to one Na(2), two equivalent Na(1), one Sr(3), two equivalent Sr(1), two equivalent Sr(2), and one P(3) atom. In the second P site, P(1) is bonded in a 8-coordinate geometry to one Na(1), one Na(2), one Sr(1), two equivalent Sr(2), two equivalent Sr(3), and one P(1) atom. In the third P site, P(2) is bonded in a 8-coordinate geometry to one Na(1), two equivalent Na(2), one Sr(2), one Sr(3), two equivalent Sr(1), and one P(2) atom. In the fourth P site, P(3) is bonded in a 8-coordinate geometry to one Na(1), two equivalent Na(2), one Sr(1), one Sr(2), two equivalent Sr(3), and one P(4) atom. is represented by the CIF file [CIF]
data_Na2Sr3P4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.356
_cell_length_b   8.001
_cell_length_c   17.203
_cell_angle_alpha   62.185
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   895.510
_cell_formula_units_Z   4
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  0.864  0.261  0.250  1.0
  Na  Na1  1  0.364  0.739  0.250  1.0
  Na  Na2  1  0.136  0.739  0.750  1.0
  Na  Na3  1  0.636  0.261  0.750  1.0
  Na  Na4  1  0.688  0.056  0.123  1.0
  Na  Na5  1  0.188  0.944  0.377  1.0
  Na  Na6  1  0.312  0.944  0.877  1.0
  Na  Na7  1  0.812  0.056  0.623  1.0
  Sr  Sr8  1  0.538  0.593  0.102  1.0
  Sr  Sr9  1  0.038  0.407  0.398  1.0
  Sr  Sr10  1  0.462  0.708  0.601  1.0
  Sr  Sr11  1  0.962  0.292  0.899  1.0
  Sr  Sr12  1  0.462  0.407  0.898  1.0
  Sr  Sr13  1  0.962  0.593  0.602  1.0
  Sr  Sr14  1  0.538  0.292  0.399  1.0
  Sr  Sr15  1  0.038  0.708  0.101  1.0
  Sr  Sr16  1  0.316  0.184  0.629  1.0
  Sr  Sr17  1  0.816  0.816  0.871  1.0
  Sr  Sr18  1  0.684  0.816  0.371  1.0
  Sr  Sr19  1  0.184  0.184  0.129  1.0
  P  P20  1  0.865  0.438  0.036  1.0
  P  P21  1  0.365  0.562  0.464  1.0
  P  P22  1  0.132  0.994  0.536  1.0
  P  P23  1  0.632  0.006  0.964  1.0
  P  P24  1  0.135  0.562  0.964  1.0
  P  P25  1  0.635  0.438  0.536  1.0
  P  P26  1  0.868  0.006  0.464  1.0
  P  P27  1  0.368  0.994  0.036  1.0
  P  P28  1  0.979  0.829  0.248  1.0
  P  P29  1  0.479  0.171  0.252  1.0
  P  P30  1  0.021  0.171  0.752  1.0
  P  P31  1  0.521  0.829  0.748  1.0
  P  P32  1  0.757  0.630  0.251  1.0
  P  P33  1  0.257  0.370  0.249  1.0
  P  P34  1  0.243  0.370  0.749  1.0
  P  P35  1  0.743  0.630  0.751  1.0
[/CIF]
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The material described by Na2Sr3P4 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to one P(1), one P(2), one P(3), and two equivalent P(4) atoms to form distorted NaP5 square pyramids that share corners with two equivalent Sr(1)P6 octahedra, corners with two equivalent Sr(2)P6 octahedra, corners with two equivalent Na(1)P5 square pyramids, faces with two equivalent Sr(1)P6 octahedra, and faces with two equivalent Sr(2)P6 octahedra. The corner-sharing octahedral tilt angles range from 42-47°. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to one P(1), one P(4), two equivalent P(2), and two equivalent P(3) atoms. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one P(1), one P(3), two equivalent P(2), and two equivalent P(4) atoms to form distorted SrP6 octahedra that share corners with two equivalent Sr(1)P6 octahedra, corners with two equivalent Sr(2)P6 octahedra, corners with two equivalent Na(1)P5 square pyramids,  an edgeedge with one Sr(1)P6 octahedra, edges with two equivalent Sr(2)P6 octahedra,  a faceface with one Sr(2)P6 octahedra, and faces with two equivalent Na(1)P5 square pyramids. The corner-sharing octahedral tilt angles range from 38-40°. In the second Sr site, Sr(2) is bonded to one P(2), one P(3), two equivalent P(1), and two equivalent P(4) atoms to form distorted SrP6 octahedra that share corners with two equivalent Sr(1)P6 octahedra, corners with two equivalent Sr(2)P6 octahedra, corners with two equivalent Na(1)P5 square pyramids,  an edgeedge with one Sr(2)P6 octahedra, edges with two equivalent Sr(1)P6 octahedra,  a faceface with one Sr(1)P6 octahedra, and faces with two equivalent Na(1)P5 square pyramids. The corner-sharing octahedral tilt angles range from 38-40°. In the third Sr site, Sr(3) is bonded in a 6-coordinate geometry to one P(2), one P(4), two equivalent P(1), and two equivalent P(3) atoms. There are four inequivalent P sites. In the first P site, P(4) is bonded in a 9-coordinate geometry to one Na(2), two equivalent Na(1), one Sr(3), two equivalent Sr(1), two equivalent Sr(2), and one P(3) atom. In the second P site, P(1) is bonded in a 8-coordinate geometry to one Na(1), one Na(2), one Sr(1), two equivalent Sr(2), two equivalent Sr(3), and one P(1) atom. In the third P site, P(2) is bonded in a 8-coordinate geometry to one Na(1), two equivalent Na(2), one Sr(2), one Sr(3), two equivalent Sr(1), and one P(2) atom. In the fourth P site, P(3) is bonded in a 8-coordinate geometry to one Na(1), two equivalent Na(2), one Sr(1), one Sr(2), two equivalent Sr(3), and one P(4) atom. is represented by the CIF file [CIF]
data_Na2Sr3P4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.356
_cell_length_b   8.001
_cell_length_c   17.203
_cell_angle_alpha   62.185
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   895.510
_cell_formula_units_Z   4
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  0.864  0.261  0.250  1.0
  Na  Na1  1  0.364  0.739  0.250  1.0
  Na  Na2  1  0.136  0.739  0.750  1.0
  Na  Na3  1  0.636  0.261  0.750  1.0
  Na  Na4  1  0.688  0.056  0.123  1.0
  Na  Na5  1  0.188  0.944  0.377  1.0
  Na  Na6  1  0.312  0.944  0.877  1.0
  Na  Na7  1  0.812  0.056  0.623  1.0
  Sr  Sr8  1  0.538  0.593  0.102  1.0
  Sr  Sr9  1  0.038  0.407  0.398  1.0
  Sr  Sr10  1  0.462  0.708  0.601  1.0
  Sr  Sr11  1  0.962  0.292  0.899  1.0
  Sr  Sr12  1  0.462  0.407  0.898  1.0
  Sr  Sr13  1  0.962  0.593  0.602  1.0
  Sr  Sr14  1  0.538  0.292  0.399  1.0
  Sr  Sr15  1  0.038  0.708  0.101  1.0
  Sr  Sr16  1  0.316  0.184  0.629  1.0
  Sr  Sr17  1  0.816  0.816  0.871  1.0
  Sr  Sr18  1  0.684  0.816  0.371  1.0
  Sr  Sr19  1  0.184  0.184  0.129  1.0
  P  P20  1  0.865  0.438  0.036  1.0
  P  P21  1  0.365  0.562  0.464  1.0
  P  P22  1  0.132  0.994  0.536  1.0
  P  P23  1  0.632  0.006  0.964  1.0
  P  P24  1  0.135  0.562  0.964  1.0
  P  P25  1  0.635  0.438  0.536  1.0
  P  P26  1  0.868  0.006  0.464  1.0
  P  P27  1  0.368  0.994  0.036  1.0
  P  P28  1  0.979  0.829  0.248  1.0
  P  P29  1  0.479  0.171  0.252  1.0
  P  P30  1  0.021  0.171  0.752  1.0
  P  P31  1  0.521  0.829  0.748  1.0
  P  P32  1  0.757  0.630  0.251  1.0
  P  P33  1  0.257  0.370  0.249  1.0
  P  P34  1  0.243  0.370  0.749  1.0
  P  P35  1  0.743  0.630  0.751  1.0
[/CIF]
.