Sr3AlAs3 crystallizes in the orthorhombic Cmce space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to two equivalent Al(1), two equivalent As(2), and four equivalent As(1) atoms. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one Al(1), one As(1), and five equivalent As(2) atoms. Al(1) is bonded to two equivalent Sr(1), two equivalent Sr(2), two equivalent As(1), and two equivalent As(2) atoms to form distorted face-sharing AlSr4As4 tetrahedra. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to two equivalent Sr(2), four equivalent Sr(1), and two equivalent Al(1) atoms. In the second As site, As(2) is bonded in a 7-coordinate geometry to one Sr(1), five equivalent Sr(2), and one Al(1) atom.
Sr3AlAs3 crystallizes in the orthorhombic Cmce space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to two equivalent Al(1), two equivalent As(2), and four equivalent As(1) atoms. Both Sr(1)-Al(1) bond lengths are 3.31 Å. Both Sr(1)-As(2) bond lengths are 3.17 Å. There are a spread of Sr(1)-As(1) bond distances ranging from 3.14-3.58 Å. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one Al(1), one As(1), and five equivalent As(2) atoms. The Sr(2)-Al(1) bond length is 3.19 Å. The Sr(2)-As(1) bond length is 3.49 Å. There are a spread of Sr(2)-As(2) bond distances ranging from 3.17-3.43 Å. Al(1) is bonded to two equivalent Sr(1), two equivalent Sr(2), two equivalent As(1), and two equivalent As(2) atoms to form distorted face-sharing AlSr4As4 tetrahedra. Both Al(1)-As(1) bond lengths are 2.50 Å. Both Al(1)-As(2) bond lengths are 2.48 Å. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to two equivalent Sr(2), four equivalent Sr(1), and two equivalent Al(1) atoms. In the second As site, As(2) is bonded in a 7-coordinate geometry to one Sr(1), five equivalent Sr(2), and one Al(1) atom.