Sr19In8N7 crystallizes in the cubic Fm-3m space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a linear geometry to four equivalent In(1), one N(1), and one N(2) atom. In the second Sr site, Sr(2) is bonded in an L-shaped geometry to four equivalent In(1) and two equivalent N(1) atoms. In the third Sr site, Sr(3) is bonded in an octahedral geometry to six equivalent N(1) atoms. In(1) is bonded to three equivalent Sr(1), six equivalent Sr(2), and three equivalent In(1) atoms to form InSr9In3 cuboctahedra that share corners with three equivalent In(1)Sr9In3 cuboctahedra, corners with six equivalent N(1)Sr6 octahedra, edges with three equivalent In(1)Sr9In3 cuboctahedra, faces with six equivalent In(1)Sr9In3 cuboctahedra,  a faceface with one N(2)Sr6 octahedra, and faces with three equivalent N(1)Sr6 octahedra. The corner-sharing octahedral tilt angles are 49°. There are two inequivalent N sites. In the first N site, N(1) is bonded to one Sr(1), one Sr(3), and four equivalent Sr(2) atoms to form NSr6 octahedra that share corners with eight equivalent In(1)Sr9In3 cuboctahedra,  a cornercorner with one N(1)Sr6 octahedra,  a cornercorner with one N(2)Sr6 octahedra, edges with four equivalent N(1)Sr6 octahedra, and faces with four equivalent In(1)Sr9In3 cuboctahedra. The corner-sharing octahedra are not tilted. In the second N site, N(2) is bonded to six equivalent Sr(1) atoms to form NSr6 octahedra that share corners with six equivalent N(1)Sr6 octahedra and faces with eight equivalent In(1)Sr9In3 cuboctahedra. The corner-sharing octahedra are not tilted.
Sr19In8N7 crystallizes in the cubic Fm-3m space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a linear geometry to four equivalent In(1), one N(1), and one N(2) atom. All Sr(1)-In(1) bond lengths are 3.96 Å. The Sr(1)-N(1) bond length is 2.49 Å. The Sr(1)-N(2) bond length is 2.61 Å. In the second Sr site, Sr(2) is bonded in an L-shaped geometry to four equivalent In(1) and two equivalent N(1) atoms. All Sr(2)-In(1) bond lengths are 3.73 Å. Both Sr(2)-N(1) bond lengths are 2.59 Å. In the third Sr site, Sr(3) is bonded in an octahedral geometry to six equivalent N(1) atoms. All Sr(3)-N(1) bond lengths are 2.73 Å. In(1) is bonded to three equivalent Sr(1), six equivalent Sr(2), and three equivalent In(1) atoms to form InSr9In3 cuboctahedra that share corners with three equivalent In(1)Sr9In3 cuboctahedra, corners with six equivalent N(1)Sr6 octahedra, edges with three equivalent In(1)Sr9In3 cuboctahedra, faces with six equivalent In(1)Sr9In3 cuboctahedra,  a faceface with one N(2)Sr6 octahedra, and faces with three equivalent N(1)Sr6 octahedra. The corner-sharing octahedral tilt angles are 49°. All In(1)-In(1) bond lengths are 3.15 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded to one Sr(1), one Sr(3), and four equivalent Sr(2) atoms to form NSr6 octahedra that share corners with eight equivalent In(1)Sr9In3 cuboctahedra,  a cornercorner with one N(1)Sr6 octahedra,  a cornercorner with one N(2)Sr6 octahedra, edges with four equivalent N(1)Sr6 octahedra, and faces with four equivalent In(1)Sr9In3 cuboctahedra. The corner-sharing octahedra are not tilted. In the second N site, N(2) is bonded to six equivalent Sr(1) atoms to form NSr6 octahedra that share corners with six equivalent N(1)Sr6 octahedra and faces with eight equivalent In(1)Sr9In3 cuboctahedra. The corner-sharing octahedra are not tilted.