Sr2Mg3In5 crystallizes in the tetragonal P-4m2 space group. Sr(1) is bonded in a 8-coordinate geometry to four equivalent In(1) and four equivalent In(2) atoms. There are two inequivalent Mg sites. In the first Mg site, Mg(1,3) is bonded to four equivalent In(2) atoms to form a mixture of distorted corner and edge-sharing MgIn4 tetrahedra. In the second Mg site, Mg(2) is bonded in a 8-coordinate geometry to four equivalent In(1) and four equivalent In(3) atoms. There are three inequivalent In sites. In the first In site, In(1) is bonded in a 9-coordinate geometry to four equivalent Sr(1), two equivalent Mg(2), one In(2), and two equivalent In(3) atoms. In the second In site, In(2) is bonded in a 9-coordinate geometry to four equivalent Sr(1); four equivalent Mg(1,3); and one In(1) atom. In the third In site, In(3) is bonded in a 8-coordinate geometry to four equivalent Mg(2) and four equivalent In(1) atoms.
Sr2Mg3In5 crystallizes in the tetragonal P-4m2 space group. Sr(1) is bonded in a 8-coordinate geometry to four equivalent In(1) and four equivalent In(2) atoms. All Sr(1)-In(1) bond lengths are 3.59 Å. All Sr(1)-In(2) bond lengths are 3.61 Å. There are two inequivalent Mg sites. In the first Mg site, Mg(1,3) is bonded to four equivalent In(2) atoms to form a mixture of distorted corner and edge-sharing MgIn4 tetrahedra. All Mg(1,3)-In(2) bond lengths are 2.99 Å. In the second Mg site, Mg(2) is bonded in a 8-coordinate geometry to four equivalent In(1) and four equivalent In(3) atoms. All Mg(2)-In(1) bond lengths are 3.01 Å. All Mg(2)-In(3) bond lengths are 3.30 Å. There are three inequivalent In sites. In the first In site, In(1) is bonded in a 9-coordinate geometry to four equivalent Sr(1), two equivalent Mg(2), one In(2), and two equivalent In(3) atoms. The In(1)-In(2) bond length is 2.89 Å. Both In(1)-In(3) bond lengths are 3.01 Å. In the second In site, In(2) is bonded in a 9-coordinate geometry to four equivalent Sr(1); four equivalent Mg(1,3); and one In(1) atom. In the third In site, In(3) is bonded in a 8-coordinate geometry to four equivalent Mg(2) and four equivalent In(1) atoms.