Sr3GeMgN4 crystallizes in the orthorhombic Pnna 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 N(1) and four equivalent N(2) atoms. In the second Sr site, Sr(2) is bonded in a 5-coordinate geometry to two equivalent N(2) and three equivalent N(1) atoms. Mg(1) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form distorted MgN4 trigonal pyramids that share edges with two equivalent Ge(1)N4 tetrahedra. Ge(1) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form GeN4 tetrahedra that share edges with two equivalent Mg(1)N4 trigonal pyramids. There are two inequivalent N sites. In the first N site, N(1) is bonded in a 6-coordinate geometry to one Sr(1), three equivalent Sr(2), one Mg(1), and one Ge(1) atom. In the second N site, N(2) is bonded in a 5-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), one Mg(1), and one Ge(1) atom.
Sr3GeMgN4 crystallizes in the orthorhombic Pnna 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 N(1) and four equivalent N(2) atoms. Both Sr(1)-N(1) bond lengths are 2.95 Å. There are two shorter (2.63 Å) and two longer (2.67 Å) Sr(1)-N(2) bond lengths. In the second Sr site, Sr(2) is bonded in a 5-coordinate geometry to two equivalent N(2) and three equivalent N(1) atoms. There is one shorter (2.60 Å) and one longer (3.04 Å) Sr(2)-N(2) bond length. There are a spread of Sr(2)-N(1) bond distances ranging from 2.60-2.66 Å. Mg(1) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form distorted MgN4 trigonal pyramids that share edges with two equivalent Ge(1)N4 tetrahedra. Both Mg(1)-N(1) bond lengths are 2.09 Å. Both Mg(1)-N(2) bond lengths are 2.13 Å. Ge(1) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form GeN4 tetrahedra that share edges with two equivalent Mg(1)N4 trigonal pyramids. Both Ge(1)-N(1) bond lengths are 1.93 Å. Both Ge(1)-N(2) bond lengths are 1.90 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a 6-coordinate geometry to one Sr(1), three equivalent Sr(2), one Mg(1), and one Ge(1) atom. In the second N site, N(2) is bonded in a 5-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), one Mg(1), and one Ge(1) atom.