Sr2CdAs2 crystallizes in the orthorhombic Cmc2_1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 5-coordinate geometry to one As(2) and four equivalent As(1) atoms. In the second Sr site, Sr(2) is bonded to two equivalent As(1) and three equivalent As(2) atoms to form a mixture of distorted edge and corner-sharing SrAs5 trigonal bipyramids. Cd(1) is bonded in a 4-coordinate geometry to two equivalent As(1) and two equivalent As(2) atoms. 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 Cd(1) atoms. In the second As site, As(2) is bonded to one Sr(1), three equivalent Sr(2), and two equivalent Cd(1) atoms to form a mixture of distorted edge and corner-sharing AsSr4Cd2 octahedra. The corner-sharing octahedral tilt angles are 71°.
Sr2CdAs2 crystallizes in the orthorhombic Cmc2_1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 5-coordinate geometry to one As(2) and four equivalent As(1) atoms. The Sr(1)-As(2) bond length is 3.07 Å. There are two shorter (3.19 Å) and two longer (3.21 Å) Sr(1)-As(1) bond lengths. In the second Sr site, Sr(2) is bonded to two equivalent As(1) and three equivalent As(2) atoms to form a mixture of distorted edge and corner-sharing SrAs5 trigonal bipyramids. Both Sr(2)-As(1) bond lengths are 3.29 Å. There are two shorter (3.13 Å) and one longer (3.14 Å) Sr(2)-As(2) bond length. Cd(1) is bonded in a 4-coordinate geometry to two equivalent As(1) and two equivalent As(2) atoms. There is one shorter (2.83 Å) and one longer (2.89 Å) Cd(1)-As(1) bond length. Both Cd(1)-As(2) bond lengths are 2.70 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 Cd(1) atoms. In the second As site, As(2) is bonded to one Sr(1), three equivalent Sr(2), and two equivalent Cd(1) atoms to form a mixture of distorted edge and corner-sharing AsSr4Cd2 octahedra. The corner-sharing octahedral tilt angles are 71°.