RbCd4As3 crystallizes in the trigonal R-3m space group. Rb(1) is bonded in a 6-coordinate geometry to six equivalent As(1) atoms. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded in a 3-coordinate geometry to one As(2) and three equivalent As(1) atoms. In the second Cd site, Cd(2) is bonded to one As(1) and three equivalent As(2) atoms to form a mixture of corner and edge-sharing CdAs4 tetrahedra. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 7-coordinate geometry to three equivalent Rb(1), one Cd(2), and three equivalent Cd(1) atoms. In the second As site, As(2) is bonded in a body-centered cubic geometry to two equivalent Cd(1) and six equivalent Cd(2) atoms.
RbCd4As3 crystallizes in the trigonal R-3m space group. Rb(1) is bonded in a 6-coordinate geometry to six equivalent As(1) atoms. All Rb(1)-As(1) bond lengths are 3.57 Å. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded in a 3-coordinate geometry to one As(2) and three equivalent As(1) atoms. The Cd(1)-As(2) bond length is 3.23 Å. All Cd(1)-As(1) bond lengths are 2.71 Å. In the second Cd site, Cd(2) is bonded to one As(1) and three equivalent As(2) atoms to form a mixture of corner and edge-sharing CdAs4 tetrahedra. The Cd(2)-As(1) bond length is 2.68 Å. All Cd(2)-As(2) bond lengths are 2.88 Å. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 7-coordinate geometry to three equivalent Rb(1), one Cd(2), and three equivalent Cd(1) atoms. In the second As site, As(2) is bonded in a body-centered cubic geometry to two equivalent Cd(1) and six equivalent Cd(2) atoms.