Sr2In3Al crystallizes in the trigonal P3m1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 12-coordinate geometry to three equivalent In(1), three equivalent In(2), three equivalent In(3), and three equivalent Al(1) atoms. In the second Sr site, Sr(2) is bonded in a 6-coordinate geometry to three equivalent In(1), three equivalent In(2), three equivalent In(3), and three equivalent Al(1) atoms. There are three inequivalent In sites. In the first In site, In(1) is bonded in a 10-coordinate geometry to three equivalent Sr(1), three equivalent Sr(2), one In(2), and three equivalent Al(1) atoms. In the second In site, In(2) is bonded in a 10-coordinate geometry to three equivalent Sr(1), three equivalent Sr(2), one In(1), and three equivalent In(3) atoms. In the third In site, In(3) is bonded in a 10-coordinate geometry to three equivalent Sr(1), three equivalent Sr(2), three equivalent In(2), and one Al(1) atom. Al(1) is bonded in a 10-coordinate geometry to three equivalent Sr(1), three equivalent Sr(2), one In(3), and three equivalent In(1) atoms.
Sr2In3Al crystallizes in the trigonal P3m1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 12-coordinate geometry to three equivalent In(1), three equivalent In(2), three equivalent In(3), and three equivalent Al(1) atoms. All Sr(1)-In(1) bond lengths are 3.67 Å. All Sr(1)-In(2) bond lengths are 3.74 Å. All Sr(1)-In(3) bond lengths are 3.29 Å. All Sr(1)-Al(1) bond lengths are 3.28 Å. In the second Sr site, Sr(2) is bonded in a 6-coordinate geometry to three equivalent In(1), three equivalent In(2), three equivalent In(3), and three equivalent Al(1) atoms. All Sr(2)-In(1) bond lengths are 3.33 Å. All Sr(2)-In(2) bond lengths are 3.31 Å. All Sr(2)-In(3) bond lengths are 3.77 Å. All Sr(2)-Al(1) bond lengths are 3.73 Å. There are three inequivalent In sites. In the first In site, In(1) is bonded in a 10-coordinate geometry to three equivalent Sr(1), three equivalent Sr(2), one In(2), and three equivalent Al(1) atoms. The In(1)-In(2) bond length is 3.36 Å. All In(1)-Al(1) bond lengths are 2.95 Å. In the second In site, In(2) is bonded in a 10-coordinate geometry to three equivalent Sr(1), three equivalent Sr(2), one In(1), and three equivalent In(3) atoms. All In(2)-In(3) bond lengths are 2.97 Å. In the third In site, In(3) is bonded in a 10-coordinate geometry to three equivalent Sr(1), three equivalent Sr(2), three equivalent In(2), and one Al(1) atom. The In(3)-Al(1) bond length is 3.21 Å. Al(1) is bonded in a 10-coordinate geometry to three equivalent Sr(1), three equivalent Sr(2), one In(3), and three equivalent In(1) atoms.