The structure described by SrMgP3N5O2 crystallizes in the monoclinic P2_1/c space group. Sr(1) is bonded in a 9-coordinate geometry to one N(2), one N(3), two equivalent N(4), two equivalent N(5), one O(1), and two equivalent O(2) atoms. Mg(1) is bonded to one N(1), one N(2), one N(3), one O(2), and two equivalent O(1) atoms to form distorted MgN3O3 octahedra that share  a cornercorner with one P(2)N3O tetrahedra,  a cornercorner with one P(3)N3O tetrahedra, corners with three equivalent P(1)N4 tetrahedra,  an edgeedge with one Mg(1)N3O3 octahedra,  an edgeedge with one P(2)N3O tetrahedra, and  an edgeedge with one P(3)N3O tetrahedra. There are three inequivalent P sites. In the first P site, P(1) is bonded to one N(1), one N(2), one N(3), and one N(5) atom to form PN4 tetrahedra that share corners with three equivalent Mg(1)N3O3 octahedra, corners with two equivalent P(2)N3O tetrahedra, and corners with two equivalent P(3)N3O tetrahedra. The corner-sharing octahedral tilt angles range from 48-61°. In the second P site, P(2) is bonded to one N(1), one N(4), one N(5), and one O(1) atom to form PN3O tetrahedra that share  a cornercorner with one Mg(1)N3O3 octahedra,  a cornercorner with one P(3)N3O tetrahedra, corners with two equivalent P(1)N4 tetrahedra, and  an edgeedge with one Mg(1)N3O3 octahedra. The corner-sharing octahedral tilt angles are 62°. In the third P site, P(3) is bonded to one N(2), one N(3), one N(4), and one O(2) atom to form PN3O tetrahedra that share  a cornercorner with one Mg(1)N3O3 octahedra,  a cornercorner with one P(2)N3O tetrahedra, corners with two equivalent P(1)N4 tetrahedra, and  an edgeedge with one Mg(1)N3O3 octahedra. The corner-sharing octahedral tilt angles are 58°. There are five inequivalent N sites. In the first N site, N(4) is bonded in a 3-coordinate geometry to two equivalent Sr(1), one P(2), and one P(3) atom. In the second N site, N(5) is bonded in a 2-coordinate geometry to two equivalent Sr(1), one P(1), and one P(2) atom. In the third N site, N(1) is bonded in a distorted trigonal planar geometry to one Mg(1), one P(1), and one P(2) atom. In the fourth N site, N(2) is bonded in a 3-coordinate geometry to one Sr(1), one Mg(1), one P(1), and one P(3) atom. In the fifth N site, N(3) is bonded in a distorted tetrahedral geometry to one Sr(1), one Mg(1), one P(1), and one P(3) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Sr(1), two equivalent Mg(1), and one P(2) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to two equivalent Sr(1), one Mg(1), and one P(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_SrMgP3N5O2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.663
_cell_length_b   7.022
_cell_length_c   14.142
_cell_angle_alpha   61.290
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   580.314
_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
  Sr  Sr0  1  0.745  0.517  0.609  1.0
  Sr  Sr1  1  0.245  0.483  0.891  1.0
  Sr  Sr2  1  0.255  0.483  0.391  1.0
  Sr  Sr3  1  0.755  0.517  0.109  1.0
  Mg  Mg4  1  0.506  0.980  0.885  1.0
  Mg  Mg5  1  0.006  0.020  0.615  1.0
  Mg  Mg6  1  0.494  0.020  0.115  1.0
  Mg  Mg7  1  0.994  0.980  0.385  1.0
  P  P8  1  0.016  0.937  0.881  1.0
  P  P9  1  0.516  0.063  0.619  1.0
  P  P10  1  0.984  0.063  0.119  1.0
  P  P11  1  0.484  0.937  0.381  1.0
  P  P12  1  0.276  0.740  0.589  1.0
  P  P13  1  0.776  0.260  0.911  1.0
  P  P14  1  0.724  0.260  0.411  1.0
  P  P15  1  0.224  0.740  0.089  1.0
  P  P16  1  0.758  0.725  0.791  1.0
  P  P17  1  0.258  0.275  0.709  1.0
  P  P18  1  0.242  0.275  0.209  1.0
  P  P19  1  0.742  0.725  0.291  1.0
  N  N20  1  0.311  0.943  0.613  1.0
  N  N21  1  0.811  0.057  0.887  1.0
  N  N22  1  0.689  0.057  0.387  1.0
  N  N23  1  0.189  0.943  0.113  1.0
  N  N24  1  0.706  0.893  0.663  1.0
  N  N25  1  0.206  0.107  0.837  1.0
  N  N26  1  0.294  0.107  0.337  1.0
  N  N27  1  0.794  0.893  0.163  1.0
  N  N28  1  0.975  0.822  0.805  1.0
  N  N29  1  0.475  0.178  0.695  1.0
  N  N30  1  0.025  0.178  0.195  1.0
  N  N31  1  0.525  0.822  0.305  1.0
  N  N32  1  0.798  0.488  0.800  1.0
  N  N33  1  0.298  0.512  0.700  1.0
  N  N34  1  0.202  0.512  0.200  1.0
  N  N35  1  0.702  0.488  0.300  1.0
  N  N36  1  0.579  0.268  0.502  1.0
  N  N37  1  0.079  0.732  0.998  1.0
  N  N38  1  0.421  0.732  0.498  1.0
  N  N39  1  0.921  0.268  0.002  1.0
  O  O40  1  0.051  0.779  0.549  1.0
  O  O41  1  0.551  0.221  0.951  1.0
  O  O42  1  0.949  0.221  0.451  1.0
  O  O43  1  0.449  0.779  0.049  1.0
  O  O44  1  0.588  0.714  0.870  1.0
  O  O45  1  0.088  0.286  0.630  1.0
  O  O46  1  0.412  0.286  0.130  1.0
  O  O47  1  0.912  0.714  0.370  1.0
[/CIF]
.
The structure described by SrMgP3N5O2 crystallizes in the monoclinic P2_1/c space group. Sr(1) is bonded in a 9-coordinate geometry to one N(2), one N(3), two equivalent N(4), two equivalent N(5), one O(1), and two equivalent O(2) atoms. Mg(1) is bonded to one N(1), one N(2), one N(3), one O(2), and two equivalent O(1) atoms to form distorted MgN3O3 octahedra that share  a cornercorner with one P(2)N3O tetrahedra,  a cornercorner with one P(3)N3O tetrahedra, corners with three equivalent P(1)N4 tetrahedra,  an edgeedge with one Mg(1)N3O3 octahedra,  an edgeedge with one P(2)N3O tetrahedra, and  an edgeedge with one P(3)N3O tetrahedra. There are three inequivalent P sites. In the first P site, P(1) is bonded to one N(1), one N(2), one N(3), and one N(5) atom to form PN4 tetrahedra that share corners with three equivalent Mg(1)N3O3 octahedra, corners with two equivalent P(2)N3O tetrahedra, and corners with two equivalent P(3)N3O tetrahedra. The corner-sharing octahedral tilt angles range from 48-61°. In the second P site, P(2) is bonded to one N(1), one N(4), one N(5), and one O(1) atom to form PN3O tetrahedra that share  a cornercorner with one Mg(1)N3O3 octahedra,  a cornercorner with one P(3)N3O tetrahedra, corners with two equivalent P(1)N4 tetrahedra, and  an edgeedge with one Mg(1)N3O3 octahedra. The corner-sharing octahedral tilt angles are 62°. In the third P site, P(3) is bonded to one N(2), one N(3), one N(4), and one O(2) atom to form PN3O tetrahedra that share  a cornercorner with one Mg(1)N3O3 octahedra,  a cornercorner with one P(2)N3O tetrahedra, corners with two equivalent P(1)N4 tetrahedra, and  an edgeedge with one Mg(1)N3O3 octahedra. The corner-sharing octahedral tilt angles are 58°. There are five inequivalent N sites. In the first N site, N(4) is bonded in a 3-coordinate geometry to two equivalent Sr(1), one P(2), and one P(3) atom. In the second N site, N(5) is bonded in a 2-coordinate geometry to two equivalent Sr(1), one P(1), and one P(2) atom. In the third N site, N(1) is bonded in a distorted trigonal planar geometry to one Mg(1), one P(1), and one P(2) atom. In the fourth N site, N(2) is bonded in a 3-coordinate geometry to one Sr(1), one Mg(1), one P(1), and one P(3) atom. In the fifth N site, N(3) is bonded in a distorted tetrahedral geometry to one Sr(1), one Mg(1), one P(1), and one P(3) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Sr(1), two equivalent Mg(1), and one P(2) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to two equivalent Sr(1), one Mg(1), and one P(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_SrMgP3N5O2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.663
_cell_length_b   7.022
_cell_length_c   14.142
_cell_angle_alpha   61.290
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   580.314
_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
  Sr  Sr0  1  0.745  0.517  0.609  1.0
  Sr  Sr1  1  0.245  0.483  0.891  1.0
  Sr  Sr2  1  0.255  0.483  0.391  1.0
  Sr  Sr3  1  0.755  0.517  0.109  1.0
  Mg  Mg4  1  0.506  0.980  0.885  1.0
  Mg  Mg5  1  0.006  0.020  0.615  1.0
  Mg  Mg6  1  0.494  0.020  0.115  1.0
  Mg  Mg7  1  0.994  0.980  0.385  1.0
  P  P8  1  0.016  0.937  0.881  1.0
  P  P9  1  0.516  0.063  0.619  1.0
  P  P10  1  0.984  0.063  0.119  1.0
  P  P11  1  0.484  0.937  0.381  1.0
  P  P12  1  0.276  0.740  0.589  1.0
  P  P13  1  0.776  0.260  0.911  1.0
  P  P14  1  0.724  0.260  0.411  1.0
  P  P15  1  0.224  0.740  0.089  1.0
  P  P16  1  0.758  0.725  0.791  1.0
  P  P17  1  0.258  0.275  0.709  1.0
  P  P18  1  0.242  0.275  0.209  1.0
  P  P19  1  0.742  0.725  0.291  1.0
  N  N20  1  0.311  0.943  0.613  1.0
  N  N21  1  0.811  0.057  0.887  1.0
  N  N22  1  0.689  0.057  0.387  1.0
  N  N23  1  0.189  0.943  0.113  1.0
  N  N24  1  0.706  0.893  0.663  1.0
  N  N25  1  0.206  0.107  0.837  1.0
  N  N26  1  0.294  0.107  0.337  1.0
  N  N27  1  0.794  0.893  0.163  1.0
  N  N28  1  0.975  0.822  0.805  1.0
  N  N29  1  0.475  0.178  0.695  1.0
  N  N30  1  0.025  0.178  0.195  1.0
  N  N31  1  0.525  0.822  0.305  1.0
  N  N32  1  0.798  0.488  0.800  1.0
  N  N33  1  0.298  0.512  0.700  1.0
  N  N34  1  0.202  0.512  0.200  1.0
  N  N35  1  0.702  0.488  0.300  1.0
  N  N36  1  0.579  0.268  0.502  1.0
  N  N37  1  0.079  0.732  0.998  1.0
  N  N38  1  0.421  0.732  0.498  1.0
  N  N39  1  0.921  0.268  0.002  1.0
  O  O40  1  0.051  0.779  0.549  1.0
  O  O41  1  0.551  0.221  0.951  1.0
  O  O42  1  0.949  0.221  0.451  1.0
  O  O43  1  0.449  0.779  0.049  1.0
  O  O44  1  0.588  0.714  0.870  1.0
  O  O45  1  0.088  0.286  0.630  1.0
  O  O46  1  0.412  0.286  0.130  1.0
  O  O47  1  0.912  0.714  0.370  1.0
[/CIF]
.