Sr2SbN3 crystallizes in the orthorhombic Cmce space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 5-coordinate geometry to two equivalent N(3) and three equivalent N(2) atoms. In the second Sr site, Sr(2) is bonded to two equivalent N(1), two equivalent N(2), and three equivalent N(3) atoms to form distorted SrN7 pentagonal bipyramids that share corners with four equivalent Sr(2)N7 pentagonal bipyramids,  a cornercorner with one Sb(1)N4 tetrahedra, edges with three equivalent Sr(2)N7 pentagonal bipyramids, and edges with four equivalent Sb(1)N4 tetrahedra. Sb(1) is bonded to one N(2), one N(3), and two equivalent N(1) atoms to form distorted SbN4 tetrahedra that share  a cornercorner with one Sr(2)N7 pentagonal bipyramid, corners with two equivalent Sb(1)N4 tetrahedra, and edges with four equivalent Sr(2)N7 pentagonal bipyramids. There are three inequivalent N sites. In the first N site, N(1) is bonded in a 4-coordinate geometry to two equivalent Sr(2) and two equivalent Sb(1) atoms. In the second N site, N(2) is bonded to two equivalent Sr(2), three equivalent Sr(1), and one Sb(1) atom to form a mixture of distorted corner and edge-sharing NSr5Sb octahedra. The corner-sharing octahedral tilt angles range from 9-49°. In the third N site, N(3) is bonded to two equivalent Sr(1), three equivalent Sr(2), and one Sb(1) atom to form a mixture of distorted corner and edge-sharing NSr5Sb octahedra. The corner-sharing octahedral tilt angles range from 9-49°.
Sr2SbN3 crystallizes in the orthorhombic Cmce space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 5-coordinate geometry to two equivalent N(3) and three equivalent N(2) atoms. There is one shorter (2.54 Å) and one longer (2.66 Å) Sr(1)-N(3) bond length. There is one shorter (2.71 Å) and two longer (3.01 Å) Sr(1)-N(2) bond lengths. In the second Sr site, Sr(2) is bonded to two equivalent N(1), two equivalent N(2), and three equivalent N(3) atoms to form distorted SrN7 pentagonal bipyramids that share corners with four equivalent Sr(2)N7 pentagonal bipyramids,  a cornercorner with one Sb(1)N4 tetrahedra, edges with three equivalent Sr(2)N7 pentagonal bipyramids, and edges with four equivalent Sb(1)N4 tetrahedra. Both Sr(2)-N(1) bond lengths are 2.70 Å. There is one shorter (2.59 Å) and one longer (2.79 Å) Sr(2)-N(2) bond length. There is one shorter (2.84 Å) and two longer (3.04 Å) Sr(2)-N(3) bond lengths. Sb(1) is bonded to one N(2), one N(3), and two equivalent N(1) atoms to form distorted SbN4 tetrahedra that share  a cornercorner with one Sr(2)N7 pentagonal bipyramid, corners with two equivalent Sb(1)N4 tetrahedra, and edges with four equivalent Sr(2)N7 pentagonal bipyramids. The Sb(1)-N(2) bond length is 2.00 Å. The Sb(1)-N(3) bond length is 2.00 Å. Both Sb(1)-N(1) bond lengths are 2.04 Å. There are three inequivalent N sites. In the first N site, N(1) is bonded in a 4-coordinate geometry to two equivalent Sr(2) and two equivalent Sb(1) atoms. In the second N site, N(2) is bonded to two equivalent Sr(2), three equivalent Sr(1), and one Sb(1) atom to form a mixture of distorted corner and edge-sharing NSr5Sb octahedra. The corner-sharing octahedral tilt angles range from 9-49°. In the third N site, N(3) is bonded to two equivalent Sr(1), three equivalent Sr(2), and one Sb(1) atom to form a mixture of distorted corner and edge-sharing NSr5Sb octahedra. The corner-sharing octahedral tilt angles range from 9-49°.