The material described by SrNb3NO7 crystallizes in the monoclinic Cm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(5), and two equivalent O(8) atoms. In the second Sr site, Sr(2) is bonded in a 6-coordinate geometry to two equivalent N(1), two equivalent O(14), and two equivalent O(9) atoms. There are six inequivalent Nb sites. In the first Nb site, Nb(1) is bonded in a 6-coordinate geometry to one O(13), one O(14), one O(4), one O(5), and two equivalent O(2) atoms. In the second Nb site, Nb(2) is bonded in a 6-coordinate geometry to one O(2), one O(3), one O(6), one O(7), and two equivalent O(4) atoms. In the third Nb site, Nb(3) is bonded in a 6-coordinate geometry to one O(11), one O(4), one O(5), one O(9), and two equivalent O(7) atoms. In the fourth Nb site, Nb(4) is bonded in a 6-coordinate geometry to one N(1), one O(12), one O(6), one O(8), and two equivalent O(10) atoms. In the fifth Nb site, Nb(5) is bonded to one N(2), one O(10), one O(11), one O(13), and two equivalent O(12) atoms to form distorted corner-sharing NbNO5 octahedra. The corner-sharing octahedral tilt angles are 31°. In the sixth Nb site, Nb(6) is bonded in a 6-coordinate geometry to one N(1), two equivalent N(2), one O(1), one O(12), and one O(3) atom. There are two inequivalent N sites. In the first N site, N(1) is bonded to two equivalent Sr(2), one Nb(4), and one Nb(6) atom to form NSr2Nb2 tetrahedra that share corners with two equivalent N(1)Sr2Nb2 tetrahedra and  an edgeedge with one O(12)Nb4 trigonal pyramid. In the second N site, N(2) is bonded in a distorted trigonal planar geometry to one Nb(5) and two equivalent Nb(6) atoms. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Sr(1) and one Nb(6) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Nb(2) and two equivalent Nb(1) atoms. In the third O site, O(3) is bonded in a linear geometry to one Nb(2) and one Nb(6) atom. In the fourth O site, O(4) is bonded to one Nb(1), one Nb(3), and two equivalent Nb(2) atoms to form distorted ONb4 trigonal pyramids that share corners with two equivalent O(4)Nb4 trigonal pyramids and  an edgeedge with one O(5)Sr2Nb2 tetrahedra. In the fifth O site, O(5) is bonded to two equivalent Sr(1), one Nb(1), and one Nb(3) atom to form distorted OSr2Nb2 tetrahedra that share corners with two equivalent O(5)Sr2Nb2 tetrahedra and  an edgeedge with one O(4)Nb4 trigonal pyramid. In the sixth O site, O(6) is bonded in a linear geometry to one Nb(2) and one Nb(4) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Nb(2) and two equivalent Nb(3) atoms. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to two equivalent Sr(1) and one Nb(4) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to two equivalent Sr(2) and one Nb(3) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Nb(5) and two equivalent Nb(4) atoms. In the eleventh O site, O(11) is bonded in a linear geometry to one Nb(3) and one Nb(5) atom. In the twelfth O site, O(12) is bonded to one Nb(4), one Nb(6), and two equivalent Nb(5) atoms to form distorted ONb4 trigonal pyramids that share corners with two equivalent O(12)Nb4 trigonal pyramids and  an edgeedge with one N(1)Sr2Nb2 tetrahedra. In the thirteenth O site, O(13) is bonded in a linear geometry to one Nb(1) and one Nb(5) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to two equivalent Sr(2) and one Nb(1) atom. is represented by the CIF card [CIF]
data_SrNb3NO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.601
_cell_length_b   10.601
_cell_length_c   9.006
_cell_angle_alpha   89.588
_cell_angle_beta   89.588
_cell_angle_gamma   20.837
_symmetry_Int_Tables_number   1
_cell_volume   360.011
_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
  Sr  Sr0  1  0.980  0.980  0.751  1.0
  Sr  Sr1  1  0.016  0.016  0.250  1.0
  Nb  Nb2  1  0.625  0.625  0.938  1.0
  Nb  Nb3  1  0.241  0.241  0.751  1.0
  Nb  Nb4  1  0.633  0.633  0.544  1.0
  Nb  Nb5  1  0.375  0.375  0.438  1.0
  Nb  Nb6  1  0.765  0.765  0.231  1.0
  Nb  Nb7  1  0.375  0.375  0.064  1.0
  N  N8  1  0.426  0.426  0.254  1.0
  N  N9  1  0.843  0.843  0.094  1.0
  O  O10  1  0.439  0.439  0.920  1.0
  O  O11  1  0.149  0.149  0.913  1.0
  O  O12  1  0.297  0.297  0.904  1.0
  O  O13  1  0.708  0.708  0.750  1.0
  O  O14  1  0.574  0.574  0.756  1.0
  O  O15  1  0.295  0.295  0.592  1.0
  O  O16  1  0.147  0.147  0.597  1.0
  O  O17  1  0.437  0.437  0.584  1.0
  O  O18  1  0.563  0.563  0.421  1.0
  O  O19  1  0.848  0.848  0.415  1.0
  O  O20  1  0.701  0.701  0.407  1.0
  O  O21  1  0.286  0.286  0.265  1.0
  O  O22  1  0.700  0.700  0.092  1.0
  O  O23  1  0.562  0.562  0.079  1.0
[/CIF]
.
The material described by SrNb3NO7 crystallizes in the monoclinic Cm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(5), and two equivalent O(8) atoms. In the second Sr site, Sr(2) is bonded in a 6-coordinate geometry to two equivalent N(1), two equivalent O(14), and two equivalent O(9) atoms. There are six inequivalent Nb sites. In the first Nb site, Nb(1) is bonded in a 6-coordinate geometry to one O(13), one O(14), one O(4), one O(5), and two equivalent O(2) atoms. In the second Nb site, Nb(2) is bonded in a 6-coordinate geometry to one O(2), one O(3), one O(6), one O(7), and two equivalent O(4) atoms. In the third Nb site, Nb(3) is bonded in a 6-coordinate geometry to one O(11), one O(4), one O(5), one O(9), and two equivalent O(7) atoms. In the fourth Nb site, Nb(4) is bonded in a 6-coordinate geometry to one N(1), one O(12), one O(6), one O(8), and two equivalent O(10) atoms. In the fifth Nb site, Nb(5) is bonded to one N(2), one O(10), one O(11), one O(13), and two equivalent O(12) atoms to form distorted corner-sharing NbNO5 octahedra. The corner-sharing octahedral tilt angles are 31°. In the sixth Nb site, Nb(6) is bonded in a 6-coordinate geometry to one N(1), two equivalent N(2), one O(1), one O(12), and one O(3) atom. There are two inequivalent N sites. In the first N site, N(1) is bonded to two equivalent Sr(2), one Nb(4), and one Nb(6) atom to form NSr2Nb2 tetrahedra that share corners with two equivalent N(1)Sr2Nb2 tetrahedra and  an edgeedge with one O(12)Nb4 trigonal pyramid. In the second N site, N(2) is bonded in a distorted trigonal planar geometry to one Nb(5) and two equivalent Nb(6) atoms. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Sr(1) and one Nb(6) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Nb(2) and two equivalent Nb(1) atoms. In the third O site, O(3) is bonded in a linear geometry to one Nb(2) and one Nb(6) atom. In the fourth O site, O(4) is bonded to one Nb(1), one Nb(3), and two equivalent Nb(2) atoms to form distorted ONb4 trigonal pyramids that share corners with two equivalent O(4)Nb4 trigonal pyramids and  an edgeedge with one O(5)Sr2Nb2 tetrahedra. In the fifth O site, O(5) is bonded to two equivalent Sr(1), one Nb(1), and one Nb(3) atom to form distorted OSr2Nb2 tetrahedra that share corners with two equivalent O(5)Sr2Nb2 tetrahedra and  an edgeedge with one O(4)Nb4 trigonal pyramid. In the sixth O site, O(6) is bonded in a linear geometry to one Nb(2) and one Nb(4) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Nb(2) and two equivalent Nb(3) atoms. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to two equivalent Sr(1) and one Nb(4) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to two equivalent Sr(2) and one Nb(3) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Nb(5) and two equivalent Nb(4) atoms. In the eleventh O site, O(11) is bonded in a linear geometry to one Nb(3) and one Nb(5) atom. In the twelfth O site, O(12) is bonded to one Nb(4), one Nb(6), and two equivalent Nb(5) atoms to form distorted ONb4 trigonal pyramids that share corners with two equivalent O(12)Nb4 trigonal pyramids and  an edgeedge with one N(1)Sr2Nb2 tetrahedra. In the thirteenth O site, O(13) is bonded in a linear geometry to one Nb(1) and one Nb(5) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to two equivalent Sr(2) and one Nb(1) atom. is represented by the CIF card [CIF]
data_SrNb3NO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.601
_cell_length_b   10.601
_cell_length_c   9.006
_cell_angle_alpha   89.588
_cell_angle_beta   89.588
_cell_angle_gamma   20.837
_symmetry_Int_Tables_number   1
_cell_volume   360.011
_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
  Sr  Sr0  1  0.980  0.980  0.751  1.0
  Sr  Sr1  1  0.016  0.016  0.250  1.0
  Nb  Nb2  1  0.625  0.625  0.938  1.0
  Nb  Nb3  1  0.241  0.241  0.751  1.0
  Nb  Nb4  1  0.633  0.633  0.544  1.0
  Nb  Nb5  1  0.375  0.375  0.438  1.0
  Nb  Nb6  1  0.765  0.765  0.231  1.0
  Nb  Nb7  1  0.375  0.375  0.064  1.0
  N  N8  1  0.426  0.426  0.254  1.0
  N  N9  1  0.843  0.843  0.094  1.0
  O  O10  1  0.439  0.439  0.920  1.0
  O  O11  1  0.149  0.149  0.913  1.0
  O  O12  1  0.297  0.297  0.904  1.0
  O  O13  1  0.708  0.708  0.750  1.0
  O  O14  1  0.574  0.574  0.756  1.0
  O  O15  1  0.295  0.295  0.592  1.0
  O  O16  1  0.147  0.147  0.597  1.0
  O  O17  1  0.437  0.437  0.584  1.0
  O  O18  1  0.563  0.563  0.421  1.0
  O  O19  1  0.848  0.848  0.415  1.0
  O  O20  1  0.701  0.701  0.407  1.0
  O  O21  1  0.286  0.286  0.265  1.0
  O  O22  1  0.700  0.700  0.092  1.0
  O  O23  1  0.562  0.562  0.079  1.0
[/CIF]
.