Sr3Y2N4 crystallizes in the monoclinic C2/c space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form distorted SrN4 trigonal pyramids that share corners with four equivalent Sr(2)N6 octahedra, corners with six equivalent Y(1)N4 tetrahedra,  an edgeedge with one Sr(2)N6 octahedra,  an edgeedge with one Y(1)N4 tetrahedra, and edges with two equivalent Sr(1)N4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 5-77°. In the second Sr site, Sr(2) is bonded to two equivalent N(1) and four equivalent N(2) atoms to form distorted SrN6 octahedra that share corners with four equivalent Y(1)N4 tetrahedra, corners with eight equivalent Sr(1)N4 trigonal pyramids, edges with two equivalent Sr(2)N6 octahedra, edges with four equivalent Y(1)N4 tetrahedra, and edges with two equivalent Sr(1)N4 trigonal pyramids. Y(1) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form distorted YN4 tetrahedra that share corners with two equivalent Sr(2)N6 octahedra, corners with two equivalent Y(1)N4 tetrahedra, corners with six equivalent Sr(1)N4 trigonal pyramids, edges with two equivalent Sr(2)N6 octahedra,  an edgeedge with one Y(1)N4 tetrahedra, and  an edgeedge with one Sr(1)N4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 35-55°. There are two inequivalent N sites. In the first N site, N(1) is bonded to one Sr(2), two equivalent Sr(1), and two equivalent Y(1) atoms to form a mixture of distorted edge and corner-sharing NSr3Y2 trigonal bipyramids. In the second N site, N(2) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Y(1) atoms.
Sr3Y2N4 crystallizes in the monoclinic C2/c space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form distorted SrN4 trigonal pyramids that share corners with four equivalent Sr(2)N6 octahedra, corners with six equivalent Y(1)N4 tetrahedra,  an edgeedge with one Sr(2)N6 octahedra,  an edgeedge with one Y(1)N4 tetrahedra, and edges with two equivalent Sr(1)N4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 5-77°. There is one shorter (2.50 Å) and one longer (2.77 Å) Sr(1)-N(1) bond length. There is one shorter (2.54 Å) and one longer (2.68 Å) Sr(1)-N(2) bond length. In the second Sr site, Sr(2) is bonded to two equivalent N(1) and four equivalent N(2) atoms to form distorted SrN6 octahedra that share corners with four equivalent Y(1)N4 tetrahedra, corners with eight equivalent Sr(1)N4 trigonal pyramids, edges with two equivalent Sr(2)N6 octahedra, edges with four equivalent Y(1)N4 tetrahedra, and edges with two equivalent Sr(1)N4 trigonal pyramids. Both Sr(2)-N(1) bond lengths are 2.74 Å. All Sr(2)-N(2) bond lengths are 3.05 Å. Y(1) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form distorted YN4 tetrahedra that share corners with two equivalent Sr(2)N6 octahedra, corners with two equivalent Y(1)N4 tetrahedra, corners with six equivalent Sr(1)N4 trigonal pyramids, edges with two equivalent Sr(2)N6 octahedra,  an edgeedge with one Y(1)N4 tetrahedra, and  an edgeedge with one Sr(1)N4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 35-55°. There is one shorter (2.26 Å) and one longer (2.31 Å) Y(1)-N(1) bond length. There is one shorter (2.29 Å) and one longer (2.31 Å) Y(1)-N(2) bond length. There are two inequivalent N sites. In the first N site, N(1) is bonded to one Sr(2), two equivalent Sr(1), and two equivalent Y(1) atoms to form a mixture of distorted edge and corner-sharing NSr3Y2 trigonal bipyramids. In the second N site, N(2) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Y(1) atoms.